施钾对棉花苗期叶片内源激素与氧自由基代谢的影响  

Effect of Potassium Nutrition on Endogenous Hormone and Free Radicals in Cotton Seedling

作　　者：郭英[1] 宋宪亮[1] 王庆材[1] 李玉静[1] 孙学振[1] 

机构地区：[1]山东农业大学农学院,山东泰安271018

出　　处：《华北农学报》2006年第1期59-62,共4页Acta Agriculturae Boreali-Sinica

基　　金：国家自然科学基金项目(30260051);山东省农业良种产业化开发项目(2004113;2005);山东农业大学博士科研基金项目(23220)

摘　　要：在大田条件下,研究了钾素对棉花苗期叶片内源激素与氧自由基代谢的影响。结果表明,施钾有利于提高棉花功能叶片中生长素(IAA)、玉米素核苷(ZR)、赤霉素(GA3)的含量,降低脱落酸(ABA)的含量,有利于提高IAA/ABA,ZR/ABA,GA3/ABA之比,延缓棉花功能叶片的衰老。同时,适量施钾肥有利于提高棉花叶片中SOD活性,降低POD活性,减少过氧化物的产生和累积,有利于降低MDA含量,减轻活性氧对细胞膜的伤害。但过量施钾对氧自由基代谢不利。Effect of potassium nutrition on endogenous hormone and free radicals in cotton leaf during seedling were studied in field condition. The resuhs indicated that potasssium application could increase IAA, ZR and GA3 content, reduced ABA content, and it seemed that the ratio of IAA/ABA, ZR/ABA, GA3/ABA could be improved in the treatment with potassium was added, thereby, senescence of cotton function leaf was postponed. Meanwhile, proper potassium application could increase SOD activity, reduced POD activity and decreased peroxide production and cumulation, reduced MDA content, which was beneficial to lower active oxygen injury to cell envelope, but exceessive potassium application was not beneficial to free radicals.

关 键 词：钾素 棉花 苗期 叶片 内源激素 氧自由基 

分 类 号：S562.06[农业科学—作物学]