基金Supported in part by grants from the National Natural Science Foundation of China(NSFC)(30300238,30571193)Natural science Foundation of Jiangsu province(BK2004418)+2 种基金Hi-Tech Key project of Jiangsu province(BG2005314)Shanghai Agricultural Committee of China(2004-NO.9-1)key project of National Key Laboratory of Crop Genetics and Germplasm Enhancement(ZW2004-12)