关键词: 小麦, 小麦, 水分利用效率(WUE), QTL

Abstract: Introgression line BC3 ,BC4,four upland rice and one lowland rice was used in this research and drought stress was imposed on booting stage of crop, aimed at compare the difference of yield, biomass and economic coefficient in different varieties and the relationship between photosynthesis parameters with yield. The result shown that BC4 has no significant difference with upland rice, but is significant different with Shengnong 265 in yield, biomass and economic coefficient; BC3 introgression line show no difference Shengnong265 in yield ,biomass and economic coefficient , but different from upland rice. This may imply that BC4 can better combine upland rice drought tolerance and lowland high yield together. Photochemical quenching coefficient(qP) is Significant correlated with yield and economic coefficient, the correlation are 0.257 and 0.308; no photosynthesis parameter has significant correlation with biomass; maximum chlorophyll fluorescence(Fm) and minimum chlorophyll fluorescence(F0) under light all has significant correlation with economic coefficient, the correlation are -0.257 and -0.224.