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Characteristics of flag leaf senescence and activated oxygen metabolism for cold type wheat

WANG Chang fa,ZHANG Song wu (Northwest Sci Tech University of Agriculture and Forestry,Yangling,Shaanxi 712100,China)  
Field experiments were conducted over three consecutive years (1995~1998).In the same weather conditions,soil and cultivating,characteristics of flag leaf senescence and activated oxygen metabolism for cold type wheat (CTW) and warm type wheat (WTW) were studied.The results showed that the decreasing rates of chlorophyll and soluble protein content in the flag leaf of CTW are lower and the contents are higher than that of WTW during grain filling.During grain formation and filling,the increasing rate of malondialdehyde content in the flag leaf of CTW is higher and the content is higher than that of WTW.In the middle and later grain filling stage,the decreasing rate of the activities of superoxide dismutase,catalase and peroxidase in the flag leaf of CTW is lower and the activities is higher than that of WTW.Those indicated that the characteristics of flag leaf senescence and activated oxygen metabolism are correlated closely with their temperature type,and temperature type may be used as a correlative measure for assessing the physiological traits of a breeding material.Activated oxygen metabolism may be responsible for the relationship between canopy temperature and grain yield.
【Fund】: 国家自然科学基金!( 3 9870 4 77);; 西北农业大学青年科学基金资助项目
【CateGory Index】: Q945.9
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