| Genetic analysis of stay-green of flag leaf and thousand-grain weight in introgression lines of wheat under different water conditions |
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| DOI：10.7606/j.issn.1000-7601.2018.01.31 |
| Key Words: wheat introgression lines drought stress stay-green thousand-grain weight quantitative genetics |
| Author Name | Affiliation | | XIN Xiao-xiao | Gansu Provincial Key Lab of Aridland Crop Science, College of Life Science and Technology, Gansu Agriculture University, Lanzhou, Gansu 730070, China | | LI Meng-fei | Gansu Provincial Key Lab of Aridland Crop Science, College of Life Science and Technology, Gansu Agriculture University, Lanzhou, Gansu 730071, China | | LIU Yuan | Gansu Provincial Key Lab of Aridland Crop Science, College of Life Science and Technology, Gansu Agriculture University, Lanzhou, Gansu 730072, China | | CHENG Hong-bo | Gansu Provincial Key Lab of Aridland Crop Science, College of Life Science and Technology, Gansu Agriculture University, Lanzhou, Gansu 730073, China | | CHANG Lei | Agronomy College, Gansu Agriculture University,Lanzhou,Gansu 730070, China | | CHENG Jing-jing | Gansu Provincial Key Lab of Aridland Crop Science, College of Life Science and Technology, Gansu Agriculture University, Lanzhou, Gansu 730070, China | | CHAI Shou-xi | Agronomy College, Gansu Agriculture University,Lanzhou,Gansu 730070, China | | YANG De-long | Gansu Provincial Key Lab of Aridland Crop Science, College of Life Science and Technology, Gansu Agriculture University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| A total of 160 introgression lines (ILs) and two parents, Xifeng 20 and Jinmai 47, were used to investigate quantitative genetic characteristics of chlorophyll content (ChlC) of flag leaf at different development stages and thousand-grain weight (TGW), and evaluate the correlations between the two traits and genetic variations of the ILs under drought stress (DS) and well-watered (WW) conditions. The results showed that there were significant differences in phenotypic values of ChlC at different growth stages and TGW in wheat ILs and two parents under two water conditions. All phenotypic values under the WW condition were significantly higher than those under the DS, associated with the drought-stress coefficients ranging from 0.79 to 0.91. Under two water conditions, the phenotypic means of all traits in the ILs were intermediated between those of two parents, but tended to be closer to the recurrent parent Jingmai 47. Thephenotypic values of all traits in the ILs varied widely, altogether with presenting substantial transgressive segregation. The coefficients of variations differed from 8.39% to 16.71% under the DS and from 8.61% to 16.54% under the WW, while the genetic diversity indices altered from 0.74 to 0.83 under the DS and from 0.71 to 0.82 under the WW. The heritability of all traits was lower, with a range of 0.29 to 0.62 under the DS and 0.20 to 0.50 under the WW. There were significantly positive correlations (r=0.500**～0.629**,DS; 0.488**～0.622**,WW) between ChlC and TGW, with ChlC having higher correlation coefficients at the grain-filling stage and under the DS condition. Furthermore, ChlC showed positive effects on TGW, and higher effects (0.582**,DS; 0.312**,WW) to TGW were associated with ChlC at the grain-filling stage. The result indicates the feasibility of using the ILs in quantitative genetic study in wheat drought tolerance, providing a theoretical basis for further dissecting the genetic basis and QTL fine mapping for green-stay trait and thousand-grain weight in wheat regulated by drought stress. |
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