| The exhibition and characteristic of the flag leaf senescence and reactive oxygen metabolism of three kinds of drought-resistant wheat,such as Changwu134,Tongmai 3,Xinong 794,are studied in the arid condition.The result shows that the flag senesce and reactive oxygen metabolism of wheat in filling stage vary from different drought-resistant varieties.Compared with Changwu 134 and Tongmai 3,the chlorophyll content of Xinong 794 is higher and has a relatively slow decreasing tendency.In 14 days after blossom,the activities of peroxide(POD) and the catalase(CAT) are higher,but which reduces quickly in the later period.The activities of two enzymes of Xinong 794 are higher in the later filling stage,and they reduce slowly and keep relatively longer time.In the whole filling stage,the content of malondialdehyde(MDA) of Xinong 794 is the least,of which the extent of the membrane peroxide is the lowest,the same as the degree of the leaf senescence. |