中文摘要：

[Objective]The study aimed to discuss the relation of leaf stomatal traits to yield and drought resistance of wheat. [Method]Using the DH population of wheat cultivar Hanxuan10/Lumai14 as the test object,the relation of leaf stomatal density (SD) ,length (SL) and width (SW) , stomatal conductance (gs) ,photosynthetic rate (Pn) ,transpiration rate (Tr) to grain yield per plant and index of drought resistance (IDR) on the 10 th and 20 th day after anthesis under the conditions of drought stress and normal irrigation were discussed by the methods of correlation analysis and path analysis. [Result]Under the two water conditions,the correlations of these stomatal traits with yield components and IDR were mostly not significant on the 10 th day after anthesis,but there were significantly positive correlations between thousand kernel weight (TKW) and these traits on the 20 th day after anthesis. Path analysis showed that gs,Pn and Tr were main factors affecting yield per plant (YPP) and IDR,and they had stronger direct effects on YPP and IDR,while their indirect interaction was also strong. The direct effects of SD,SL and SW on YPP and IDR were small,as well as their indirect action among SD,SL and SW. On the other hand,the correlations between SD and SL were significant,and the correlations of SL with SW,gs,Pn and Tr were extremely significant on the 10 th and 20 th day after anthesis under the two water conditions. However, the correlations of SD and SL with gs,Pn,and Tr changed with water conditions or growth stages,showing that water conditions or growth stages had great effects on the correlations between two traits. Therefore,it is not always a good means to improve stomatal conductance,photosynthetic rate and transpiration rate and hence promote wheat yield by selecting stomatal density and size. [Conclusion]The research could provide scientific references for revealing the roles of leaf stomatal traits in wheat breeding for drought resistance.

英文摘要：

[ Objective] The study aimed to discuss the relation of leaf stomatal traits to yield and drought resistance of wheat. [ Method] Using the DH population of wheat cultivar Hanxuanl0/Lumai14 as the test object, the relation of leaf stomatal density （SD）, length （SL） and width （ SW）, stomatal conductance （g,）, photosynthetic rate （ Pn ）, transpiration rate （ Tr） to grain yield per plant and index of drought resistance （IDR） on the 10th and 20t＂ day after anthesis under the conditions of drought stress and normal irrigation were discussed by the methods of correlation analysis and path analysis. [ Result] Under the two water conditions, the correlations of these stomatal traits with yield components and IDR were mostly not significant on the 10t＂ day after anthesis, but there were significantly positive correlations between thousand kernel weight （TKW） and these traits on the 20^th day after anthesis. Path analysis showed that g,, Pn and Tt, were main factors affecting yield per plant （YPP） and IDR, and they had stron- ger direct effects on YPP and IDR, while their indirect interaction was also strong. The direct effects of SD, SL and SW on YPP and IDR were small, as well as their indirect action among SD, SL and SW. On the other hand, the correlations between SD and SL were significant, and the correlations of SL with SW, gn, P, and Tt, were extremely significant on the 10th and 20th day after anthesis under the two water conditions. However, the correlations of SD and SL with g,, P,, and Tr changed with water conditions or growth stages, showing that water conditions or growth stages had great effects on the correlations between two traits. Therefore, it is not always a good means to improve stomatal conductance, photosynthetic rate and transpiration rate and hence promote wheat yield by selecting stomatal density and size. [ Conclusion] The research could provide scientific references for revealing the roles of leaf stomatal traits in wheat breeding for drought resistance.