耕作方式对棉花不同部位果枝叶衰老生理特性的影响

Effects of Different Tillage Treatments on the Senescence Physiological Characteristics of the Fruit Branch Leaves in the Different Positions of Cotton Plant

以转Bt基因抗虫棉33B、杂交抗虫棉农大棉6号为材料,以翻耕、旋耕、免耕三种不同耕作方式为处理,对棉株不同部位果枝叶的生理特性进行了研究。结果表明:翻耕、旋耕、免耕处理不同部位果枝叶的叶绿素、蛋白质含量依次降低,MDA含量依次升高,并且这一规律在两品种上的表现一致。表明翻耕利于延缓果枝叶衰老,免耕果枝叶衰老现象最重,旋耕居中。农大棉6号中后期叶绿素和蛋白质的含量高于33B,MDA含量低于33B,说明农大棉6号抗早衰能力强于33B。

Using insect-resistant transgenic 13t varieties （Bacillus thuringiensis）, cotton 3313 and Nongdamian 6, applying plowing, rotary tillage, direct drilling as treatments, the physiological characteristics of different positions fruit branch leaves were studied. The experiments were carried out at the teaching and experiment station（13aoding, Hebei Province）of Agricultural University of Hebei, in 2005 and 2006. The result showed： 1） The content of chlorophyll and dissoluble protein of different positions fruit branch leaves reduced along a sequence of plowing 〉 rotary tillage〉direct drilling; 2） MDA reduced along a sequence of direct drilling〉rotary tillage〉plowing. The trends are identical in both varieties. It indicates that plowing is propitious to delay the senescence of fruit branch leaf, the senescence phenomenon of direct drilling is severest, that of rotary tillage is in the middle. Compared with 3313,the content of chlorophyll and dissoluble protein of Nongdamian 6 in middle and late phases was more than that of 3313, the content of MDA was less than that of 33B, which indicated that the capability of antisenescence of Nongdamian 6 was stronger than 3313.