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为了筛选出适宜的脱叶剂喷施时间及脱叶效果较好的脱叶剂,研究了大田条件下脱叶剂喷施时间及脱叶剂种类对棉花叶片内源激素含量、抗氧化酶活性及丙二醛含量的影响,并探讨了脱叶剂对棉花生理效应的影响。采用裂区试验设计,以脱叶剂喷施时间为主区,脱叶剂种类为副区进行试验。结果表明:喷施540 g/L脱吐隆悬浮剂(主要成分为18%噻苯隆和36%敌草隆)及5.5%噻苯隆悬浮剂后,棉花叶片中脱落酸(ABA)含量及超氧化物歧化酶(SOD)、过氧化物酶(POD)和过氧化氢酶(CAT)活性均呈先升高后降低的趋势,丙二醛(MDA)含量升高,生长素(3-吲哚乙酸,IAA)含量下降,其中脱吐隆对叶片膜系统破坏严重;在棉花吐絮率为50%时喷施540 g/L脱吐隆悬浮剂,25 d后棉花脱叶率和吐絮率分别可达90.1%和99.9%。
In order to screen suitable defoliation agent spraying time and defoliation better leaf defoliating agent, defoliant spraying time and defoliant species under field conditions on the endogenous hormone content of cotton leaves, antioxidant enzyme activity And malondialdehyde (MDA) content, and the effects of defoliants on the physiological effects of cotton were also discussed. The split zone design was adopted, the spraying time was the main area with defoliants and the defoliant type was tested as the subzone. The results showed that the ABA content in cotton leaves and the ABA content in cotton leaves after sprayed with 540 g / L desiposaur suspension (the main components were 18% thidiazuron and 36% diuron) and 5.5% The activity of superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) firstly increased and then decreased, while the content of malondialdehyde (MDA) (IAA) decreased, of which desiposauron severely damaged the leaf membrane system. At the rate of 50% cotton sprinkling, 540 g / L desorption suspension was sprayed. After 25 days, Up to 90.1% and 99.9% respectively.