抗旱小麦籽粒灌浆期旗叶衰老与活性氧代谢研究

Research on the flag leaf senescence and activate oxygen metabolism of drought-resistant wheat in filling stage

以3种抗旱品种长武134、铜麦3号、西农794为供试材料,研究干旱条件下小麦旗叶衰老与活性氧代谢特征。试验结果表明,灌浆期不同抗旱性品种小麦旗叶衰老和活性氧代谢存在差异。与长武134和铜麦3号相比较,西农794的叶绿素含量较高且降低趋势最缓慢;开花后第14天长武134的过氧化物酶(POD)和过氧化氢酶(CAT)活性较高,后期活性降低快,西农794两种酶活性在灌浆后期含量较高,降低速度慢,持续时间长;整个灌浆期间西农794的丙二醛含量最少,膜质过氧化程度最低,叶片衰老程度最慢。

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 droughtresistant 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.