1. Introduction

Recently, antioxidants have attracted considerable interest in food technology researches. Antioxidants, their availability in diets and probable roles in countering deadly diseases such as cancer, neurodegenerative and cardiovascular diseases have been highlighted in various studies (Manach et al. 2004; Scalbert et al. 2005; Thaipong et al. 2006;Surangi et al. 2012). Natural antioxidants, particularly in fruits and vegetables, have gained the attention of both researchers and consumers. Leaf pigments, such as β-cyanins, β-xanthins, chlorophyll, carotenoids and vitamins,are the major groups of natural antioxidants that are available in vegetables amaranth and involved in defences against several diseases including cancer, cardiovascular diseases, atherosclerosis, arthritis, cataracts, emphysema,retinopathy, neuro degenerative diseases and in flammation,and preventing aging (Cai et al. 2003; Alvarezjubete et al.2010; Ritva et al. 2010; Steffensen et al. 2011; Esatbeyoglu et al. 2015).

The interest of consumers in the aesthetic, nutritional and safety aspects of food has increased the demand for natural pigments such as chlorophyll, betalains, and carotene. Betalains are water-soluble compounds found in a limited number of families of the plant order Caryophyllales,like Amaranthus having aunique source of betalains and important free radical-scavenging activity (Cai et al. 2003;Dantas et al. 2015). β-Cyanins are colored betalains from red to purple (condensation of betalamic acid and cyclodopa, considering hydroxycinnamic acid derivatives or sugars as residue) and β-xanthins are yellow betalains(imine condensation products between betalamic acid and amines or amino acid residues) (Herbach et al. 2006).Similarly, carotene grouped into α-carotene, β-carotene and xanthophyll.

Pigments and their pharmacological activities include anticancer (Szaefer et al. 2014), antilipidemic (Wroblewska et al. 2011) and antimicrobial (Canadanovic et al. 2011)activities, indicating that betalains and carotene may be a potential source for the production of functional foods.Presently, the only commercial source of betalains and carotene is the red beet root. The colorant preparations from red beet root labelled as E-162 are exempted from batch certification. E-162 is used in processed foods such as dairy products and frozen desserts (Stintzing and Carle 2007).

Among the naturally occurring vegetable pigments,betalains are rare and limited to a few edible vegetables,such as red beet and amaranth, while chlorophylls are widely distributed in plant species (Schwartz and Von-Elbe 1980).The active ingredients of betalains and carotene provide anti-in flammatory property to our food and act as potential antioxidants, which can reduce the risk of cardiovascular disease and lung and skin cancers and is widely used as additive for food, drugs, and cosmetic products because of natural properties and absence of toxicity (Kanner et al.2001; Butera et al. 2002).

In Asia and Africa, vegetable amaranth is intaken by boiling and making curries, while in Amricas and a few Asian and European countries, it is freshly intaken by making salad or juice. Recently, we extracted red color juice from Amaranthus for natural drink containing pigments chlorophyll, betalains, and carotene. It demands more genotypes enriched with leaf pigments. We found lots of variations in vegetable amaranth germplasm in respect to minerals, vitamins, leaf color, quality, and agronomic traits in our earlier studies (Sarker et al. 2014, 2015a, b, 2016).Therefore, we studied 20 cultivated genotypes of vegetable amaranth to: i) estimate total antioxidant capacity, amount of antioxidant leaf pigments and foliage yield; ii) select high-yielding genotypes containing high antioxidant leaf pigments for making colorful juice commercially; and (iii)find out possible ways for improving the antioxidant leaf pigments without compromising foliage yield.

2. Materials and methods

2.1. Experimental site

The experiment was conducted at the experimental field of Bangabandhu Sheikh Mujibur Rahman Agricultural University, Bangladesh. The experimental site was located in the center of the Madhupur Tract (AEZ-28) at approximately 24°23´ north latitude and 90°08´ east longitude, having a mean elevation of 8.4 m above sea level. The experimental field is a highland with silty clay soil. The soil conditions were: slightly acidic (pH 6.4), low in organic matter (0.87%),total N of 0.09% and exchangeable K of 0.13 centimol kg–1.The experimental site is in a subtropical zone and has sharp differences in summer and winter temperatures.

2.2. Materials

Twenty distinct and promising selected genotypes of vegetable amaranth were investigated during 2014–2015 and 2015–2016 growing seasons.

2.3. Experiment design, layout, and cultural practices

The total chlorophyll content showed a highly pronounced variation among all the chlorophyll traits. VA13 had the highest total chlorophyll content (906.23 μg g–1), followed by VA14(770.22 μg g–1), VA7 (753.73 μg g–1), VA16 (737.43 μg g–1),VA15 (704.83 μg g–1) and VA19 (703.04 μg g–1). The lowest amount of total chlorophyll was found in VA8(179.94 μg g–1). The mean total chlorophyll content was 528.47 μg g–1. Eleven genotypes showed above-average mean values for total chlorophyll content. The estimated CV for total chlorophyll was 1.53%.

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2.4. Data collection of foliage yield

相对于其他施工技术，帷幕灌浆技术操作较为方便。在开展帷幕灌浆技术的过程中，必须充分结合施工方案，在合理的位置进行钻探和灌浆。随着时间的延续，水泥会完成凝固，凝固的水泥和周围的泥土形成坚硬的保护物，也就是形成了效果较好的帷幕防渗系统。帷幕灌浆技术具有以下特点：适用范围广、施工成本低、施工成果佳。

2.5. Determination of chlorophyll and total carotenoid content

Chlorophyll a, chlorophyll b, and total chlorophyll were determined from 96% ethanolic extracts of the fresh-frozen amaranth leaves following the method in Lichtenthaler and Wellburn (1983) and total carotenoid content was determined from acetone: Haxen extract of the fresh-frozen amaranth leaves using spectrophotometer (Hitachi, U-1800,Tokyo, Japan) at 665, 649, and 470 nm for chlorophyll a,chlorophyll b and total carotenoid contents, respectively.

2.6. Determination of β-cyanins and β-xanthins content

Mean performance coef ficient of variation (CV, %) and critical difference (CD) for bioactive leaf pigments,antioxidant vitamins, and foliage yield of 20 vegetable amaranth genotypes are presented in Table 1. The analysis of variance revealed significant differences among the genotypes for all the 10 traits which was the indication of the validity of further statistical analysis due to the presence of a wide range of variability among the 20 genotypes of vegetable amaranth.

2.7. Ascorbic acid

There were significant variations among the genotypes in β-cyanins contents and the average β-cyanins content was 359.53 ng g–1. The highest β-cyanins content was observed in VA18 (538.51 ng g–1), followed by VA3 (537.21 ng g–1) and VA14 (500.40 ng g–1), while the lowest β-cyanins content was observed in VA6 (185.52 ng g–1). The CV of this trait was 2.06%. Out of 20 genotypes, 9 showed above-average values for β-cyanins content.

The amount of vitamin C (μg 100 g–1) was calculated as follows:

2009年7月22日国务院审议通过了《文化产业振兴计划》，文化产业发展进入新时期，各地竞相发展具有自己地方特色的文化产业。文化软实力的开发与文化产业的振兴有力推进中国传统文化的复兴与传播[3]。以老子、庄子为代表的道家文化是中国传统文化的重要组成部分，它对我国政治文化和文学艺术以及当今世界的影响越来越大，具有成为国家文化软实力的充分条件。

Ascorbic acid (μg 100 g–1)=Ascorbic acid obtained from curve (μg)/1 000×10 mL (extract)/4×100/Sample weight (g)

Finally, it was converted in to mg 100 g–1.

2.8. Extraction of samples for chemical analysis

The leaves were harvested at the edible stage, 30 days after sowing, and dried overnight in an oven for chemical analysis. A total of 1 gram of dried leaf from each cultivar was ground and dissolved in 40 mL of 90% methanol. The tightly capped bottle was then placed in an 80°C shaking water bath (Thomastant T-N22S, Thomas Kagaku Co., Ltd.,Japan). After 1 h, the extract was cooled and filtered for further analytical assays of total antioxidant capacity.

2.9. Total antioxidant capacity

Antioxidant activity was measured using the diphenylpicryl-hydrazyl (DPPH) radical degradation method(Alvarez-Jubete et al. 2010). Briefly, 10 μL of leaf extract solution (in triplicate) was placed in test tubes along with 4 mL of distilled water and 1 mL of 250 μmol L-1 DPPH solution. The tubes were mixed and allowed to stand for 30 min in the dark before the absorbance was read at 517 nm using a spectrophotometer (U-1800, HITACHI,Tokyo, Japan). Antioxidant activity was calculated as the percent of inhibition relative to the control using the following equation:

Antioxidant activity (%)=(A blank–A sample/A blank)×100

Where, A blank is the absorbance of the control reaction(10 μL of methanol instead of sample extract) and A sample is the absorbance of the test compound. Trolox was used as the reference standard, and the results were expressed as μg trolox equivalent g–1 DW.

2.10. Statistical analysis

Antioxidant leaf pigments In statistical analysis, the chlorophyll a content had significant pronounced variations among the genotypes. Accession VA13 had the highest chlorophyll a content (636.87 μg g–1), followed by VA19(523.21 μg g–1), VA14 (517.16 μg g–1), and VA16 (504.56 μg g–1). The lowest amount of chlorophyll a was found in VA8 (127.26 μg g–1). Twelve genotypes showed above average mean values for chlorophyll a content. The mean chlorophyll a content was 346.21 μg g–1. The estimated CV for chlorophyll a was 2.61%.

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3. Results

3.1. Mean performance

β-Cyanins and β-xanthins were extracted from fresh-frozen amaranth leaves using 80% methanol containing 50 mmol L–1 ascorbic acid according to Wyler et al. (1959). β-Cyanins and β-xanthins were measured spectrophotometrically at 540 and 475 nm, respectively. The quanti fications were done using mean molar extinction coef ficients, which were 62×106 cm2 mol–1 for β-cyanins and 48×106 cm2 mol–1 for β-xanthins. The results were expressed as nanograms betanin per gram fresh-frozen weight (FFW) for β-cyanins and nanograms indicaxanthin per gram FFW for β-xanthins.

The raw data of consecutive two years were compiled by taking the means of all the plants taken for each treatment and replication for different traits. The mean data of consecutive two years were averaged and statistically and biometrically analyzed. Analysis of variance was done according to Panse and Sukhatme (1978) for each character. Genotypic and phenotypic variances, genotypic and phenotypic coefficient of variation (GCV and PCV),heritability (h2b) in broad sense, and genetic advance in percent of mean (GAMP, %) and correlation were estimated according to Singh and Chaudhary (1985).

Accession VA17 had the highest chlorophyll b content(292.19 μg g–1), followed by VA7 (278.21 μg g–1), VA15(271.08 μg g–1) and VA13 (268.34 μg g–1). The lowest amount of chlorophyll b was found in VA8 (51.67 μg g–1). The mean chlorophyll b content was 181.25 μg g–1.Eleven genotypes showed above average mean values for chlorophyll b content. The estimated CV for chlorophyll b was 1.96%.

Table 1 Mean performance of total antioxidant capacity, antioxidant leaf pigments and vitamins, foliage yield in vegetable amaranth genotypes

1) CV, coefficient of variation; CD, critical difference. 2) TAC, total antioxidant capacity; TEAC, trolox equivalent antioxidant capacity; DW, dry weight.＊ and ＊＊, significant at 5 and 1% levels, respectively.

Genotype1)Chlorophyll a (μg g–1)Foliage yield(g plant-1)VA1 174.54 83.06 258.61 286.85 256.38 543.16 76.02 175.59 18.62 8.94 VA2 346.84 158.54 506.39 391.53 398.09 789.55 83.89 11.97 30.95 14.62 VA3 304.82 226.20 532.03 537.21 584.71 1121.85 55.38 16.34 32.83 15.36 VA4 160.74 66.74 228.49 249.15 268.76 517.84 69.04 96.49 18.92 9.20 VA5 358.73 156.37 516.12 356.29 358.17 714.38 72.07 63.69 27.65 12.12 VA6 131.56 62.42 194.99 185.52 181.90 367.35 68.84 87.17 15.64 7.32 VA7 474.51 278.21 753.73 279.76 281.07 560.75 55.47 102.81 17.68 9.14 VA8 127.26 51.67 179.94 340.28 344.11 684.32 56.18 101.65 14.99 12.58 VA9 381.33 190.65 573.00 427.66 417.25 844.84 73.52 71.85 29.85 15.60 VA10 240.90 106.45 348.36 264.03 274.70 538.66 44.81 134.61 18.62 12.30 VA11 205.99 222.16 429.16 385.52 372.19 757.64 88.29 135.58 29.98 12.12 VA12 131.07 71.27 203.35 233.87 230.57 464.36 65.91 97.70 32.02 9.80 VA13 636.87 268.34 906.23 407.94 427.55 835.42 32.77 94.49 32.82 16.14 VA14 517.16 252.05 770.22 500.40 502.79 1 003.12 65.55 184.77 27.68 32.06 VA15 432.74 271.08 704.83 343.99 346.18 690.10 59.81 66.63 24.98 23.28 VA16 504.56 231.86 737.43 484.77 492.99 977.69 82.89 72.01 28.61 26.46 VA17 400.18 292.19 693.38 225.64 218.70 444.27 96.08 113.97 18.63 13.20 VA18 429.62 239.09 669.72 538.51 554.31 1 092.74 49.39 67.69 29.93 26.40 VA19 523.21 178.82 703.04 302.17 308.31 610.41 96.37 96.49 31.68 19.20 VA20 441.60 217.78 660.39 453.59 467.36 920.87 105.08 65.69 32.65 23.14 Mean 346.21 181.25 528.47 359.73 364.30 723.97 69.87 92.86 25.74 15.95 F-value ＊＊ ＊＊ ＊＊ ＊＊ ＊＊ ＊＊ ＊＊ ＊＊ ＊＊SE 0.1245 0.1322 0.2752 0.9925 0.9875 0.9524 0.1453 0.2145 0.0025 0.0524 CV (%) 2.612 1.985 1.534 2.056 2.125 1.235 1.241 2.055 0.1021 1.068 CD 0.3161 0.3357 0.6987 2.5200 2.5073 2.4181 0.3689 0.5446 0.0014 0.1330 Chlorophyll b (μg g–1)Total chlorophyll(μg g–1)β-Cyanins(ng g–1)β-Xanthins(ng g–1)Betalains(ng g–1)Total carotene(mg 100 g–1)Ascorbic acid(mg 100 g–1)TAC(TEAC μg g–1 DW)2)

Vegetable amaranth was sown in a randomized complete block design (RCBD) in triplicate for both years. The unit plot size of each genotype was 1 m2. The spacing was 20 cm between rows and 5 cm between plants.Recommended fertilizer and compost doses and appropriate cultural practices were maintained. Thinning was performed to maintain appropriate plant density within rows. Weeding and hoeing were performed at 7-day intervals. Day time temperatures during the experimental period ranged from 25 to 38.5°C. Irrigation was provided at 5- to 7-day intervals.For foliage yield, the plants were cut at the base of the stem(ground level).

Ascorbic acid was analyzed using the method described by Roe (1954). To extract the sample, 5 g of fresh leaves were ground with 5% H3PO3:10% acetic acid (dissolving 50 g of H3PO3 in 900 mL of distilled water+100 mL of glacial acetic acid and volume was made up to 1 L with distilled water)for 1–3 min. The amount of extraction fluid was taken such that it should yield 1–10 μg mL–1 ascorbic acid. One or two drops of bromine were also added to the solution, which was then stirred until it turned yellow. The excess bromine was decanted onto a bubbler, and the air passed until the bromine color disappeared. The bromine-oxidized solution was placed in two tubes. In the first tube, 1 mL of filtered 2,4-DNP thio-urea reagent (2,4-dinitrophenyl hydrazine-thiourea, prepared by dissolving 2 g of 2,4-DNP in 100 mL of 9 N H2SO4 and then dissolving 4 g of thio-urea in this solution) was added, and the tube was placed in a 37°C water bath for 3 h. Then, 5 mL of 85% H2SO4 (100 mL of distilled water+900 mL of concentrated H2SO4) was added drop-wise to the tube that was placed in a beaker of ice water.In the second tube, 1 mL of 2,4-DNP thio-urea reagent only was added, and this sample was used as a blank solution.After 30 min, the absorbance reading of the sample was taken at 540 nm using a spectrophotometer. The blank solution was used for setting the zero transmittance of the spectrophotometer. The standard solution was prepared by dissolving 100 mg of high-purity ascorbic acid in 100 mL of 5% H3PO3:10% acetic acid and the solution oxidized with bromine water as described above. A total of 10 mL of this dehydro-ascorbic acid was brought up to 500 mL with the 85% H2SO4 solution. Different dilutions were prepared by taking 5, 10, 20, 30, 40, 50 and 60 mL of the above solution into 100 mL volumetric flasks, and the total volume of each was brought up to 100 mL by the addition of 85% H2SO4.This procedure was also used for the experimental samples.The calibration curve was prepared by plotting absorbance values against concentration of vitamin C (in μg).

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Data were collected 30 days after sowing of seeds. The foliage yield (g plant-1) were recorded on 10 randomly selected plants in each replication.

There were significant variations among the genotypes in β-xanthins contents. The average β-xanthins content was 364.30 ng g–1. The highest β-xanthins content was observed in VA3 (584.71 ng g–1), followed by VA18 (554.31 ng g–1),VA14 (502.79 ng g–1), and VA16 (492.99 ng g–1), while the lowest β-xanthins content was observed in VA6 (181.90 ng g–1). The CV was 2.12%. Nine genotypes showed aboveaverage values for β-xanthins content.

There were significant variations among the genotypes in betalains contents. The average betalains content was 723.97 ng g–1. The highest betalains content was observed in VA3 (1 121.85 ng g–1) followed by VA18 (1 092.74 ng g–1), VA14 (1 003.12 ng g–1), VA16 (977.69 ng g–1), and VA20 (920.87 ng g–1), while the lowest betalains content was observed in VA6 (367.35 ng g–1). The CV was 1.24%.Out of 20 genotypes, 9 showed above-average values for betalains content.

There were significant variations among the genotypes in total carotene contents. The average total carotene content was 69.87 mg 100 g–1. The highest total carotene content was observed in VA20 (105.08 mg 100 g–1), followed by VA19 (96.37 mg 100 g–1), VA17 (96.08 mg 100 g–1), and VA11 (88.29 mg 100 g–1), while the lowest total carotene content was observed in VA13 (32.77 mg 100 g–1). The CV of this trait was 1.25%. Out of 20 genotypes, 9 showed above-average values for total carotene content.

Ascorbic acid There were significant variations among the genotypes in ascorbic acid contents. The average ascorbic acid content was 92.86 mg 100 g–1. The highest ascorbic acid content was observed in VA14 (184.77 mg 100 g–1),followed by VA1 (175.59 mg 100 g–1), VA11 (135.58 mg 100 g–1), and VA10 (134.61 mg 100 g–1), while the lowest ascorbic acid content was observed in VA2 (11.97 mg 100 g–1). The CV was 2.06%. Out of 20 genotypes, 11 showed above-average values for ascorbic acid content.

Total antioxidant capacity The variations of total antioxidant capacity were highly pronounced among the genotypes which ranged from 14.99 (VA8) to 32.83 TEAC μg g–1 DW(VA3). The highest total antioxidant capacity was found in the genotype VA3 (32.83 TEAC μg g–1 DW), VA13 (32.82 TEAC μg g–1 DW), and VA20 (32.65 TEAC μg g–1 DW) followed by VA12 (32.02 TEAC μg g–1 DW), VA19 (31.68 TEAC μg g–1 DW), VA2 (30.95 TEAC μg g–1 DW), VA11 (29.98 TEAC μg g–1 DW), VA18 (29.93 TEAC μg g–1 DW) and VA9 (29.85 TEAC μg g–1 DW). In contrast, the lowest total antioxidant capacity was observed in VA8 (14.99 TEAC μg g–1 DW). The average mean of total antioxidant capacity was 25.74 TEAC μg g–1 DW. Twelve genotypes showed above-average performance for total antioxidant capacity. The coef ficient of variation for this trait was 0.102%.

1.燃气类分布式能源企业分类。燃气类分布式能源企业分为区域型和楼宇型。分布式能源主要特征是实现冷、热、电三联供，能源就地消纳。

Foliage yield There were the significant and highest variations among the genotypes. The highest value was found in VA14 (32.06 g) followed by VA18 (26.40 g), VA16 (26.46 g),VA15 (23.28 g), and VA20 (23.14 g). The lowest value was observed in VA6 (7.32 g) followed by VA1 (8.94 g), VA4(9.14 g) and VA7 (9.20 g). The average was 15.95 g. The CV (1.07) was the lowest among all the traits analyzed.Seven genotypes showed above-average values.

3.2. Variability studies

The genotypic and phenotypic variance , coefficients of variation (GCV and PCV), h2b, GA and GAMP are presented in Table 2. The highest genotypic variance was observed for total chlorophyll (50 937.32), followed by betalains (49 079.42), chlorophyll a (23 739.53), β-xanthins(13 122.89), β-cyanins (11 448.54). Chlorophyll b (6 626.21),ascorbic acid (81 881.67) exhibited moderate genotypic variances. On the other hand, the lowest genotypic variance was observed for total antioxidant capacity (42.09). The phenotypic variances for all the traits were slightly higher but close to the genotypic variances. GCV values ranged from 26.59% (total carotene) to 44.91% (chlorophyll b).The PCV values ranged from 27.50% (total carotene) to 48.15% (ascorbic acid). In the present investigation, all the traits had high to moderate genotypic and phenotypic variances along with moderate GCV and PCV values. The heritability estimates were high for all the traits and ranged from 95.59% (foliage yield) to 99.58% (chlorophyll b). The highest expected genetic advance was exhibited for total chlorophyll (464.93%) followed by betalains (456.37%),chlorophyll a (317.40%), β-xanthins (235.98%), β-cyanins(220.42%), and chlorophyll b (167.69%). GAMP ranged from 54.77 (total carotene) to 96.23 (ascorbic acid). The highest GAMP was found in ascorbic acid (96.23%), followed by chlorophyll b (92.52%), chlorophyll a (91.68%), foliage yield (89.50%), total chlorophyll (87.98%). Total carotene,β-cyanins, β-xanthins, betalains, and total antioxidant capacity showed moderate GAMP (around 50–60%).

3.3. Correlation studies

The phenotypic and genotypic correlations between the various characters are presented in Table 3. In the present investigation, the genotypic correlation coef ficients were very much close to the corresponding phenotypic values for all the traits. The chlorophyll a had a significant positive correlation with all the traits except total carotene and ascorbic acid. Chlorophyll b exhibited significant positive correlation with all the traits except total carotene and ascorbic acid. Similarly, total chlorophyll had a significant positive interrelationship with all the other traits except total carotene and ascorbic acid. β-Cyanins had a significant positive associations with β-xanthins, betalains and foliage yield. β-Xantins showed significant positive associations with betalains and foliage yield. Similarly,betalains showed possitive interrelationships with foliage yield. Total antioxidant capacity showed significant positive associations with all the leaf pigments, ascorbic acid and foliage yield. All the antioxidant leaf pigments and total antioxidant capacity had a significant positive associations with foliage yiled and among each other. The interesting results is that ascorbic acid had an insignificant negative interrelationships among all antioxidant vitamins and leaf pigments, while it exhibited significant positive associations with total antioxidant capacity. Total carotene had an insignificant negative correlations with chlorophyll a, β-cyanins, β-xanthins and betalains, ascorbic acid and insingni ficant positive corelations with chlorophyll b and total chlorophyll and foliage yield. This trait showed significant positive associations with total antioxidant capacity only.This indicates that selection for antioxidant vitamins content might be possible without compromising yield loss.

4. Discussion

The present investigation revealed that vegetable amaranth is rich in chlorophyll a (346.21 μg g–1), chlorophyll b (181.25 μg g–1), total chlorophyll (528.47 μg g–1), β-cyanins (359.73 ng g–1) and β-xanthins (364.30 ng g–1), betalains (723.97 ng g–1),total carotene (69.87 mg 100 g–1), ascorbic acid (92.86 mg 100 g–1) and total antioxidant (25.74 TEAC μg g–1 DW).

人文学者塞巴斯蒂亚诺·埃里佐（M.Sebastiano Erizzo，1525～1585 年）著作㉜中的大量古物实例给里帕提供了一种掌握古代钱币的扎实技能。至于古代雕塑和纪念碑浮雕，沃纳通过分析《图像学》提到的大型雕塑的具体位置（过去的和当时的），她判断里帕很可能是借鉴了考古学概述之类的实用手册。学者麦格拉斯也认为，即使里帕熟悉这些雕塑，在他有主教家的图书资源可利用时，应该也不会为了详尽描述而选择亲身前往古代艺术作品的原址一睹究竟。㉝当然有时里帕也会将多种资源的综合利用，比如拟人形象“Historia”（“历史”），他借鉴的就不是单一图像性资源。

让学生畅游在经典文化名著中，诵读和感悟到传统文化的精髓和魅力，对于当前小学生语文素养的提升具有积极的意义。作为小学语文教师，应该帮助学生合理地选择经典阅读素材，培养学生良好的阅读兴趣和习惯，提升整个经典诵读的成效性。此外，教师还应该认识到经典诵读过程中对于学生审美、价值观等精神思维的引导作用，提升小学生的内在文化感和民族自豪感，增强学生的文化知识贮备，为小学语文课程的教学打下基础。

Five genotypes, VA14, VA16, VA18, VA15, and VA20 showed high foliage yield and also found to be a rich source of antioxidant leaf pigments and vitamins. Selection of these genotypes would be economically useful for antioxidant leaf pigments and vitamins, and high yield aspects. The genotypes VA13 and VA19 had above-average foliage yield along with rich source of the antioxidant leaf pigments and vitamins while the genotypes VA2, VA3, VA9, VA11, VA12 and VA17 had a high amount of the colorant antioxidant leaf pigments and below-average foliage yield yield. These eight genotypes can be used as a donor parent for integration of potential genes of the high antioxidant leaf pigments and vitamins into other genotypes.

GPS-RTK在土地利用现状测绘中坐标转换精度分析……………………………………………………… 陈晶晶（4-69）

The highest genotypic variance was observed for total chlorophyll (50 937.32), followed by betalains (49 079.42),chlorophyll a (23 739.53), β-xanthins (13 122.89), and β-cyanins (11 448.54) indicating greater scope of selection for these traits. The phenotypic variances for all the traits were slightly higher but close to the genotypic variances which indicated the predominance of additive gene actions.GCV values ranged from 26.59% (total carotene) to 44.91%(chlorophyll b). In the present investigation, all the traits had high to moderate genotypic and phenotypic variances along with moderate GCV and PCV values, which indicate scope for improvement in these traits through selection dueto predominance of additive gene action for these traits. The heritability estimates were high for all the traits and ranged from 95.59% (foliage yield) to 99.58% (chlorophyll b). The highest expected genetic advance was exhibited for total chlorophyll (464.93%) followed by betalains (456.37%),chlorophyll a (317.40%), β-xanthins (235.98%), β-cyanins(220.42%), and chlorophyll b (167.69%). The highest GAMP was found in ascorbic acid (96.23%), followed by chlorophyll b (92.52%), chlorophyll a (91.68%), foliage yield(89.50%), and total chlorophyll (87.98%). Total carotene,β-cyanins, β-xanthins, betalains, and total antioxidant capacity showed moderate GAMP (around 50–60%). In the present study, the high heritability and high to moderate genetic advance values were observed for all the traits except foliage yield indicated preponderance of additive gene effects and improvement could be achieved through selection of these traits.

Table 2 Genetic parameter for total antioxidant capacity, antioxidant leaf pigments and vitamins, and foliage yield in vegetable amaranth genotypes

1) , genotypic variance; , phenotypic variance; GCV, genotypic coefficient of variation; PCV, phenotypic coefficient of variation;,heritability in broad sense; GAMP, genetic advance in percent of mean. 2) TAC, total antioxidant capacity; TEAC, trolox equivalent antioxidant capacity; DW, dry weight.

Genetic parameter1)Chlorophyll a(μg g–1)Chlorophyll b(μg g–1)Total chlorophyll(μg g–1)β-Cyanins(ng g–1)β-Xanthins(ng g–1)Betalains(ng g–1)Total carotene(mg 100 g–1)Ascorbic acid (mg 100 g–1)TAC(μg TEAC g–1 DW)2)Foliage yield(g plant–1)σ2 g 23 739.53 6 626.21 50 937.32 11 448.54 13 122.89 49 079.42 345.04 1 881.67 42.09 48.02 σ2 p 23 998.26 6 682.34 51 449.24 11 959.75 13 255.76 49 997.35 369.26 1 999.52 44.17 52.55 GCV 44.50 44.91 42.71 29.74 31.45 30.60 26.59 46.71 25.20 43.45 PCV 44.75 45.10 42.92 30.40 31.60 30.89 27.50 48.15 25.82 45.45 h2 b 99.46 99.58 99.50 97.84 99.50 99.08 96.66 97.01 97.62 95.59 GA 317.40 167.69 464.93 220.42 235.98 456.37 38.27 89.36 13.36 14.28 GAMP 91.68 92.52 87.98 61.27 64.78 63.04 54.77 96.23 51.92 89.50

Table 3 Genotypic and phenotypic correlation co-efficient (rg and rp) for total antioxidant capacity, antioxidant leaf pigments and vitamins, and foliage yield in vegetable amaranth genotypes

1) TAC, total antioxidant capacity; TEAC, trolox equivalent antioxidant capacity; DW, dry weight.＊ and ＊＊, significant at 5 and 1% levels, respectively.

Trait1)Coefficient type Chlorophyll b(μg g–1)Total chlorophyll(μg g–1)β-Cyanins(μg g–1)β-Xanthins(ng g–1)Betalains(ng g–1)Total carotene(mg 100 g–1)Ascorbic acid(mg 100 g–1)TAC(μg TEAC g–1 DW)2)Foliage yield(g plant-1)Chlorophyll a(μg g–1)rg 0.820＊＊ 0.978＊＊ 0.498＊＊ 0.498＊ 0.499＊ –0.008 –0.126 0.482＊ 0.664＊＊rp 0.818＊＊ 0.976＊＊ 0.497＊＊ 0.496＊ 0.497＊ –0.007 –0.125 0.480＊ 0.662＊＊Chlorophyll b(μg g–1)rg 0.921＊＊ 0.504＊ 0.496＊ 0.501＊ 0.043 –0.118 0.402＊ 0.565＊＊rp 0.920＊＊ 0.502＊ 0.495＊ 0.500＊ 0.042 –0.116 0.400＊ 0.564＊＊Total chlorophyll(μg g–1)0.522＊＊ 0.519＊ 0.521＊ 0.009 –0.129 0.472＊ 0.657＊＊rp 0.521＊ 0.518＊ 0.520＊ 0.008 –0.128 0.471＊ 0.655＊＊β-Cyanins(ng g–1)rg 0.993＊＊ 0.998＊＊ –0.087 –0.302 0.651＊＊ 0.741＊＊rp 0.992＊＊ 0.996＊＊ –0.086 –0.301 0.651＊＊ 0.740＊＊β-Xanthins(ng g–1)rg 0.998＊＊ –0.128 –0.360 0.652＊＊ 0.725＊＊rp 0.997＊＊ –0.126 –0.358 0.651＊＊ 0.724＊＊Betalains(ng g–1)rg–0.108 –0.333 0.654＊＊ 0.734＊＊rp –0.106 –0.331 0.653＊＊ 0.732＊＊Total carotene(mg 100 g–1)rg–0.030 0.557＊＊ 0.074 rp –0.028 0.556＊＊ 0.072 Ascorbic acid(mg 100 g–1)rg 0.792＊＊ –0.028 rp 0.786＊＊ –0.026 TAC (μg TEAC g–1 DW)rg 0.485＊rg 0.484＊rp

In the present investigation, the genotypic correlation coefficients were very much close to the corresponding phenotypic values for all the traits that indicating predominance of additive gene action, i.e., less environmental influence of these traits. The chlorophyll a, chlorophyll b and total chlorophyll had a significant positive correlation with all the traits except total carotene and ascorbic acid. A similar trend of positive associations was observed by earlier work in Amaranthus tricolor (Shukla et al. 2006; Sarker et al.2014). β-Cyanins had a significant positive associations with β-xanthins, betalains and foliage yield. β-Xantins showed significant positive associations with betalains and foliage yield. Similarly, betalains showed possitive interrelationships with foliage yield. Total antioxidant capacity showed significant positive associations with all the leaf pigments,ascorbic acid and foliage yield. These indidates that high antioxidant content was closely associated with foliage yield of vegetable amaranth. All the antioxidant leaf pigments and total antioxidant capacity had a significant positive associations with foliage yiled and among each other. These indicate that improvement of foliage yield, total antioxidant content and antioxidant leaf pigments might be possible by improving any of the antioxidant leaf pigments. Shukla et al. (2010) observed a positive association of foliage yield with β-carotene and ascorbic acid. Interesting results is that, ascorbic acid and total carotene had an insignificant interrelationships among all antioxidant vitamin and leaf pigments while it exhibited significant positive associations with total antioxidant capacity. This indicates that selection for antioxidant vitamin content might be possible without compromising yield loss.

5. Conclusion

Considering high genotypic and phenotypic variances along with GCV and PCV values, high heritability coupled with GAMP, all the traits could be selected for the improvement of 20 vegetable amaranth genotypes under study.However, the correlation study revealed a strong positive association among all the antioxidant leaf pigments, total antioxidant capacity and foliage yield. Selection based on total antioxidant capacity, antioxidant leaf pigments could be economically viable to improve the yield potential of vegetable amaranth genotypes. Insignificant negative genotypic correlation was observed between total carotene versus chlorophyll a, β-cyanins, β-xanthins, betalains, and ascorbic acid. In contrast, this trait also showed insignificant positive associations with chlorophyll b, total chlorophyll, and foliage yield. Ascorbic acid had an insignificant negative interrelationships among all antioxidant vitamins and bioactive leaf pigments. This indicates that selection for antioxidant vitamins might be possible without compromising yield loss. Based on mean performance, five vegetable amaranth genotypes VA14, VA16, VA18, VA15 and VA20 were identified as high yielding having substantial amount of antioxidant leaf pigments and vitamins and suitable for extraction of colorful juice. The genotypes VA13 and VA19 had above-average foliage yield and enrich of antioxidant pro files while the genotypes VA2, VA3, VA9, VA11, VA12 and VA17 had a high antioxidant pro files and below-average foliage yield. These eight genotypes can be used as a donor parent for integration of potential genes of the high antioxidant leaf pigments into other genotypes.

Acknowledgements

The authors are thankful to the Research Management Committee (RMC) of Bangabandhu Sheikh Mujibur Rahaman Agricultural University, Bangladesh for providing partial financial support to carry out the present investigation.

要分析 110KV高压断路器拒动的原因，就要检查好线圈的材料与质量，而动铁心会出现卡死，导致操作机构无法顺利分闸。

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