Crops ›› 2017, Vol. 33 ›› Issue (6): 23-29.doi: 10.16035/j.issn.1001-7283.2017.06.005

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Research on Relationship between Photosynthetic Characteristics and Drought Resistance in Spring Wheat

Wang Shuguang1,Shi Yugang1,Shi Huawei1,Cao Yaping2,Sun Daizhen1   

  1. 1College of Agronomy,Shanxi Agricultural University,Taigu 030801,Shanxi,China
    2Wheat Research Institute,Shanxi Academy of Agricultural Sciences,Linfen 041000,Shanxi,China
  • Received:2017-07-25 Revised:2017-10-27 Online:2017-12-15 Published:2018-08-26
  • Contact: Daizhen Sun

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Abstract:

Twenty-six spring wheat strains were used to test stomatal conductance (Gs), photosynthetic rate (Pn) and transpiration rate (Tr) of flag leaves at 10 and 20d after flowering (at the early and middle filling stage) under the rainfed and irrigated conditions, respectively. The genetic and phenotypic correlations between these main photosynthetic traits and drought resistance index were analyzed, and heritability and correlative heritability of these traits were also analyzed. The purpose of the experiment was to provide the basis for selection of photosynthetic traits in spring wheat drought breeding. The results showed that a lot of some photosynthetic traits in spring wheat were significantly related to drought resistance. Under irrigation, heritabilities of Tr and Gs at early grain filling were larger; correlative heritabilities between the Gs at early grain filling and drought resistance index was also larger. Under rainfed, there were larger correlative heritability between Pn and Tr at middle filling stage, Gs at early and middle filling stages and drought resistance index. On basis of the conjoint analysis results of genetic correlation coefficient, heritability and correlative heritability, Tr and Pn at the middle filling stage and Gs at early and middle filling stages under rainfed condition should be focused on in spring wheat drought breeding practice.

Key words: Spring wheat, Photosynthetic characteristics, Drought resistance, Hereditary correlation, Heritability

Table 1

Mean values of main photosynthetic traits"

品系Strain Pn(10) [μmol/(m2·s)] Pn(20) [μmol/(m2·s)] Tr(10) [mmol/(m2·s)] Tr(20) [mmol/(m2·s)] Gs(10) [mmol/(m2·s)] Gs(20) [mmol/(m2·s)]
雨养
Rainfed		 灌溉
Irrigation		 雨养
Rainfed		 灌溉
Irrigation		 雨养
Rainfed		 灌溉
Irrigation		 雨养
Rainfed		 灌溉
Irrigation		 雨养
Rainfed		 灌溉
Irrigation		 雨养
Rainfed		 灌溉
Irrigation
9606 0.65 0.77 0.25 0.31 4.98 5.34 2.79 3.31 69.60 80.50 165.07 175.67
9609 0.67 0.71 0.42 0.36 4.50 5.47 1.82 3.79 82.83 89.40 156.17 183.66
9611 0.72 0.74 0.25 0.31 4.53 6.13 2.81 3.86 78.43 91.20 160.87 187.63
9624 0.74 0.85 0.31 0.36 6.13 6.63 3.79 5.57 87.37 100.77 168.33 182.62
9627 0.75 0.83 0.36 0.45 5.58 6.45 3.43 4.84 91.03 104.63 167.26 195.66
9631 0.62 0.87 0.32 0.42 5.26 7.49 3.27 4.39 93.77 105.97 178.87 194.05
9636 0.63 0.83 0.22 0.37 4.35 7.01 2.11 4.64 60.03 98.10 142.63 180.60
9643 0.62 0.75 0.26 0.48 5.36 6.86 3.28 4.00 79.70 95.37 171.10 188.26
9646 0.70 0.74 0.17 0.28 4.58 5.67 2.90 3.45 62.83 82.07 140.10 175.80
9648 0.58 0.65 0.18 0.35 5.30 6.02 2.85 3.55 67.23 74.70 151.36 168.87
9654 0.66 0.69 0.29 0.41 5.56 6.27 1.82 4.07 65.00 83.83 150.72 171.96
9655 0.62 0.65 0.31 0.38 5.56 6.04 2.89 4.00 60.10 82.47 145.10 176.83
9656 0.65 0.50 0.36 0.25 5.64 5.98 3.06 3.37 51.99 79.96 156.73 163.13
9659 0.71 0.72 0.17 0.51 4.22 6.18 2.45 3.76 72.17 90.70 132.14 177.62
9663 0.58 0.76 0.25 0.63 5.43 7.31 3.41 4.49 62.17 96.17 172.73 186.43
9668 0.66 0.63 0.20 0.33 5.45 4.81 2.69 2.82 65.50 57.84 150.33 154.00
9681 0.76 0.90 0.29 0.46 6.93 6.51 3.71 4.07 84.80 104.40 186.57 205.93
9691 0.69 0.72 0.34 0.41 6.10 6.39 3.12 3.79 65.83 82.80 155.46 172.17
9697 0.56 0.67 0.13 0.26 5.55 5.54 2.44 3.37 49.87 79.00 151.01 151.13
9698 0.57 0.69 0.19 0.25 6.12 4.76 2.23 3.19 60.67 74.70 121.90 152.97
9701 0.42 0.72 0.15 0.25 5.60 5.86 2.60 2.13 47.03 76.50 137.23 170.97
9725 0.58 0.72 0.38 0.44 5.62 6.03 3.18 4.22 87.60 69.10 157.77 171.33
9728 0.48 0.76 0.35 0.24 6.21 6.30 3.66 3.18 53.30 83.80 151.87 172.97
9740 0.75 0.80 0.39 0.35 6.52 6.80 3.99 3.88 94.83 91.17 173.90 203.40
9741 0.43 0.67 0.17 0.42 6.09 4.60 3.72 4.33 70.80 80.27 109.96 136.77
9746 0.61 0.52 0.15 0.46 6.18 5.21 3.86 3.43 87.00 108.50 184.40 204.07

Table 2

Pot yield comparison of spring wheat strains under the two water conditions g"

品系Strain 灌溉Irrigation 雨养Rainfed t值 t value 品系Strain 灌溉Irrigation 雨养Rainfed t值 t value
9606 973.90 866.38 3.94* 9659 576.17 390.02 6.69**
9609 701.33 604.32 4.17* 9663 980.20 815.36 5.77**
9611 801.53 713.93 1.09 9668 655.87 571.61 2.35
9624 1 333.40 1 163.40 4.44** 9681 1 070.23 972.87 1.04
9627 1 225.46 1 064.98 2.99* 9691 776.46 696.11 3.35*
9631 1 019.33 973.04 1.14 9697 457.53 376.46 4.47**
9636 471.03 384.82 1.86 9698 619.31 583.16 0.95
9643 983.46 724.51 9.81** 9701 641.30 524.55 7.18**
9646 530.47 431.52 2.66 9725 864.76 843.34 0.49
9648 657.83 606.71 2.73 9728 893.16 862.02 0.64
9654 503.27 381.74 4.76** 9740 1 175.90 1 155.66 0.61
9655 738.97 606.47 9.56** 9741 652.73 561.32 5.02**
9656 829.10 816.51 0.17 9746 1 063.40 891.68 6.16**

Table 3

Drought resistance coefficient, comprehensive drought resistance coefficient and drought resistance index of main photosynthetic traits in spring wheat strains"

品系
Strain		 抗旱系数Drought resistance coefficient (%) 综合抗旱系数
Comprehensive drought resistance coefficient		 抗旱指数
Drought resistance index
Pn(10) Pn(20) Tr(10) Tr(20) Gs(10) Gs(20)
9606 85.21 79.85 91.34 83.41 92.46 85.64 86.31 106.90
9609 93.33 97.35 80.41 51.58 86.86 90.41 83.32 76.24
9611 67.53 78.58 72.69 73.28 84.73 85.61 77.07 78.13
9624 97.62 86.85 92.43 66.61 90.27 87.77 86.93 146.73
9627 88.45 82.32 85.76 71.41 84.15 88.64 83.46 128.15
9631 85.31 77.65 68.97 75.43 91.96 87.44 81.13 103.94
9636 62.42 58.63 60.05 44.38 77.98 60.61 60.68 36.30
9643 97.66 54.47 76.53 80.43 91.26 82.71 80.51 100.34
9646 79.07 62.36 81.37 83.63 78.69 74.56 76.61 51.41
9648 100.42 52.23 87.04 80.32 87.75 89.83 82.93 68.95
9654 83.54 71.74 88.65 45.32 86.03 76.73 75.34 47.69
9655 79.42 85.32 93.16 75.39 81.26 72.13 81.11 74.33
9656 97.89 99.02 93.54 91.08 95.36 66.58 90.58 104.26
9659 82.65 34.64 67.88 64.49 73.37 80.12 67.19 48.47
9663 76.57 46.63 73.38 76.03 88.72 65.48 71.14 87.74
9668 96.52 62.62 97.91 94.18 96.36 111.02 93.12 80.86
9681 75.45 62.48 96.87 91.68 89.54 80.36 82.73 113.50
9691 92.64 81.36 94.19 81.77 91.23 77.35 86.42 84.89
9697 74.43 49.92 99.39 73.61 97.92 65.48 76.79 44.07
9698 71.42 75.29 98.65 69.32 77.46 80.21 78.73 65.56
9701 44.36 61.38 96.68 120.45 79.62 63.43 77.65 62.39
9725 67.68 85.21 95.47 74.34 91.12 97.87 85.29 97.95
9728 55.35 97.81 98.45 116.23 85.78 64.43 86.35 105.13
9740 97.54 96.39 94.42 104.76 84.66 98.86 96.11 147.27
9741 72.31 40.47 81.62 109.19 87.42 81.84 78.81 69.18
9746 98.76 35.36 99.81 96.54 91.21 79.85 83.59 128.22

Table 4

The relative efficiency of main photosynthetic traits on drought resistance in spring wheat strains"

性状
Trait		 环境
Environment		 表型相关系数(rp)
Phenotypic correlation
coefficient		 遗传相关系数(rg)
Genetic correlation
coefficient		 遗传力(H2,%)
Heritability		 相关遗传力(Hxy)
Correlation
heritability		 相对选择效率
Relative efficiency
Pn(10) 雨养Rainfed 0.3007* 0.2787 34.42 5.87 0.19
灌溉Irrigation 0.1149 0.1155 40.29 6.35 0.08
Pn(20) 雨养Rainfed 0.5485** 0.5592** 25.28 5.03 0.32
灌溉Irrigation 0.1534 0.1588 33.62 5.79 0.10
Tr(10) 雨养Rainfed 0.5879** 0.6004** 36.71 6.06 0.41
灌溉Irrigation 0.3232* 0.3400* 54.62 7.39 0.29
Tr(20) 雨养Rainfed 0.7981** 0.7747** 28.19 5.31 0.47
灌溉Irrigated 0.3489* 0.3369* 47.36 6.88 0.26
Gs(10) 雨养Rainfed 0.7127** 0.7155** 32.36 5.69 0.46
灌溉Irrigation 0.4960** 0.4922** 51.55 7.18 0.40
Gs(20) 雨养Rainfed 0.7219** 0.7219** 25.49 5.05 0.41
灌溉Irrigation 0.5326** 0.5062** 37.13 6.09 0.35

Table 5

Correlative heritability and genetic variation contribution rate between main photosynthetic traits and drought resistance in spring wheat strains"

性状
Trait		 环境
Environment		 相关遗传力
Correlative
heritability		 相关遗传变异贡献率
Correlative genetic variation
contribution rate
Pn(10) 雨养Rainfed 0.2193 0.6897
灌溉Irrigation 0.1280 0.6459
Pn(20) 雨养Rainfed 0.4168 0.7174
灌溉Irrigation 0.1537 0.7582
Tr(10) 雨养Rainfed 0.3928 0.7734
灌溉Irrigation 0.2156 0.8147
Tr(20) 雨养Rainfed 0.4798 0.6258
灌溉Irrigation 0.2478 0.7219
Gs(10) 雨养Rainfed 0.4912 0.6983
灌溉Irrigation 0.4329 0.7812
Gs(20) 雨养Rainfed 0.4537 0.6276
灌溉Irrigation 0.3458 0.6467
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