留叶枝对抗虫杂交棉库源关系的调节效应和对叶片衰老与皮棉产量的 .doc

留叶枝对抗虫杂交棉库源关系的调节效应和对叶片衰老与皮棉产量的 .doc

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留叶枝对抗虫杂交棉库源关系的调节效应和对叶片衰老与皮棉产量的

留叶枝对抗虫杂交棉库源关系的调节效应和对叶片衰老与皮棉产量的影响 董合忠1,李维江1,唐 薇1,李振怀1牛曰华1,2,张冬梅1山东棉花研究中心山东省棉花栽培生理重点实验室, 济南 2501002莱阳农学院, 青岛 266109Effects of Retention of Vegetative Branches on Source-Sink Relation, Leaf Senescence and Lint Yield in Bt Transgenic Hybrid Cotton DONG He-zhong1, LI Wei-jiang1, TANG Wei1, LI Zhen-huai1, NIU Yue-hua1,2, ZHANG Dong-mei1 (1Cotton Research Center, Shandong Academy of Agricultural Sciences, Shandong Key Lab for Cotton Culture and Physiology, Jinan 250100; 2 Faculty of Plant Science and Technology, Laiyang Agricultural University, Qingdao 266109) Abstract: 【Objective】Removal of vegetative branches (VB) has been a traditional practice for field management in cotton production in China, but current studies indicate that retention of VB is of great value for improving cotton yield. Therefore,it is necessary to determine the feasibility of VB retention in cotton plants and the underlying mechanisms. 【Method】hree hybrid cotton varieties were grown in a fertile land at a considerably low population density (3.0 plants/m2) in Linqing in 2004 and 2005. Yield and yield components, leaf area index, leaf chlorophyll content, boll load per leaf area and leaf photosynthetic rate (Pn) of cotton plants either with or without VB were examined each year. 【Results】Retention of VB reduced average boll weight, but significantly increased boll numbers per ground area and thus enhanced lint yield by 9.8% and 6.2% in 2004 and 2005 relative to removal of VB, respectively. Green leaf percentage and average chlorophyll content in canopy leaves in VB-retained plants were significantly increased, but chlorophyll content and Pn in functional leaves on the main stem of plants with VB was considerably decreased, compared to those of VB-removed plants. Retention of VB resulted in significantly strengthened leaf source before peak boll-setting and extended boll sinks at late stages of plant. However,“flow” (transportation) capability of cotton plants seemed to be inhibited by VB retention.

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