Under the condition of trough culture with rain-proof shelter,the effects of different soil water treatment on flag leaf senescence of different drought-endaring wheat cultivars were studied.The results showed that,with the decrease of soil water,the content of chlorophyll and iPAs as well as the photosynthetic rate of flag leaf declined,while the content of MDA and ABA increased.As a result,the flag leaf senescence accelerated and the yield decreased remarkablely.Compared with irrigated field cultivar Luma...