叶部激素变化与小麦的整体衰老

Changes of hormones concentration and senescence of the wheat

旗叶中的叶绿素含量在抽穗—开花期达其最大值 ,然后迅速下降 ;丙二醛的含量逐渐上升 ;SOD活性逐渐下降。脱落酸的含量在灌浆的初期逐渐升高 ,中期达其最高值 ;玉米素在开花期达其峰值后迅速下降 ,旗叶的衰老与叶片中二激素间的浓度变化、平衡有关 ;根系活力在拔节—孕穗期达其高峰值 ,以后逐渐下降 ;根系活力在生育中、后期的下降与叶片中玉米素的下降、脱落酸的上升有直接关系 ,根系的早衰可能是引发小麦地上部衰老的重要原因之一。

The content of the chlorophyll in the flag leaf reached the highest point during heading-blooming,then it descended rapidly. The content of the MDA raised and the activity of the SOD dropped gradually during the development stage,the content of the ABA raised and reached peak value during the primary to the middle stage of the filling phase. The zeatin topped the highest level in blooming stage and declined swiftly. The senescence of the flag leaf close to the changes of both hormones concentration and balance between each other. The vigor of the root is in peak during elongation-booting stage and came down slowly, which interrelated to the downfall of the zeatin and raise of the ABA. The declination of root vigor may be an important reason to the senescence of the aboveground part of the wheat.