(2) The content of chlorophyll and dissoluble protein of the leaf decreased significantly and MDA content increased when nitrogen was deficient,which accelerated the process of senescence;

• 2)氮素营养缺乏会引起整体叶片的叶绿素、可溶性蛋白质含量大幅度下降,丙二醛含量升高,加速了叶片的衰老进程;