棉花钾吸收动力学的初步研究和应用

棉花学报 Cotton Science 2005，17(3)：165-170

棉花钾吸收动力学的初步研究和应用
张志勇，王刚卫，田晓莉，李召虎，段留生，翟志席，何钟佩
(中国农业大学农学与生物技术学院，北京100094)

摘要：研究了影响棉花钾吸收动力学参数的因素，初步确定了钾吸收动力学方法在棉花上应用的条件，比较了转基因抗虫棉新棉99B和常规棉中棉所35苗期的钾吸收特性。结果表明，棉花钾吸收动力学参数受到苗龄、耗竭液中起始钾浓度及培养液中钾浓度的显著影响，在苗龄较小(3-4叶苗与4-5叶苗相比)、耗竭液中起始钾浓度较高(0.35与0.2 mmol•L^-1相比)、培养液中钾浓度较高(2.0与0.5 mmol•L^-1相比)的情况下，K_m、C_min均比较高，而I_max在前两种条件下较高、在后一种条件下较低。在5-6叶期，新棉99B的I_max显著降低于中棉所35，而K_m、C_min显著高于后者(培养液中K⁺为0.5 mmo1•L^-1)，耗竭液中起始K+为O．2mm1•L^-1)，说明新棉99B吸收有限钾的能力低于中棉所35。
关键词：棉花；钾；吸收动力学
中图分类号：S562．062 文献标识码：A
文章编号：1002-7807(2005)03-0165-06 [全文，658KB]

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