数字农科院2.0

Genetic basis of traits related to stomatal conductance in wheat cultivars in response to drought stress

文献类型： 外文期刊

作者： Wang, S. G.;Jia, S. S.;Sun, D. Z.;Wang, H. Y.;Dong, F. F.;Ma, H. X.;Jing, R. L.;Ma, G.

作者机构：

关键词： drought stress;photosynthetic rate;quantitative trait loci;stomatal conductance;transpiration rate;wheat

期刊名称： PHOTOSYNTHETICA

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收录情况： SCI

摘要： The genetic basis of stomatal conductance (g (s)), net photosynthetic rate (P (N)), and transpiration rate (E) was explored by using a wheat doubled haploid population from a cross of Hanxuan10 and Lumai 14. The above three traits were evaluated in wheat flag leaves at 10, 20, 30 days after anthesis under drought stress (DS) and well-watered (WW), and quantitative trait loci (QTL) were analyzed. Expression of the traits during the grain filling stage showed downward trends under both conditions, but expression of three phenotypes were stronger under WW than those under DS. Extremely significant positive correlations were established among the traits at all growth stages under both conditions. A total of 18 additive QTLs for those traits were identified on 10 chromosomes. Among them, two batches of nine additive QTLs were associated with the target traits under DS and WW, respectively. Two additive QTLs for g (s) and E, two for g (s) and P (N), six for g (s), P (N), and E clustered at the same or near the region (colocation) of chromosomes 4A, 2B, and 7B, respectively. This provided genetic basis for close phenotype correlations among g (s), P (N), and E. Furthermore, QTLs for g (s), P (N), and E near Xgwm577 and Xgwm611 located on 7B chromosome were linked to previously reported QTLs regulating a SPAD value and the chlorophyll a/b ratio under dark-induced condition. This finding indicated that these QTLs on 7B chromosome might be involved in the process of wheat leaf senescence.

分类号： Q94

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