乙烯抑制剂对钾缺乏棉花根系生长和侧根形成的影响.pdfVIP

棉 花 学报 Cotton Science 20 15袁27 渊4 冤院362―371 烯抑制剂对钾缺乏棉花根系生长和侧根形成的影响 * 张志勇 张新 王素芳 卜晶晶 河南科技学院/ 河南省现代生物育种协同创新中心袁 南新乡453003 冤 摘要院水培条件下袁通过用乙烯前体1- 氨基环丙烷基羧酸 ACC 冤和乙烯抑制剂氨氧基乙酸 AOA 冤尧Co2+ 和Ag+ 分别处理棉花幼苗根系和叶片袁研究其对钾缺乏棉花根系伸长和侧根形成的影响袁探讨钾缺乏棉花根系伸长 和侧根形成与乙烯生成增加之间的关系遥 结果显示袁钾充分营养液中袁添加ACC 显著抑制了棉花根系伸长和 侧根形成遥 钾缺乏营养液中袁添加ACC 加重了对根系伸长和侧根发生的抑制曰添加AOA 和Ag+ 分别显著降 低了根系长度和侧根数曰添加Co2+ 显著提高了根系长度袁但其高浓度显著减少了侧根数遥 由此可见袁钾缺乏诱 导乙烯释放增加或许是根系伸长受抑制的原因遥 钾缺乏条件下Co2+ 处理叶片显著增加了叶面积尧根系长度和 侧根数袁这表明改善叶片生长可积极调节根系生长和发育遥 关键词院1- 氨基环丙烷基羧酸 ACC 冤曰Co2+ 曰根系伸长曰侧根形成曰叶面积 中图分类号院S562.01 文献标志码院A 文章编号院1002-7807(2015 04-0362-10 10.11963/issn.1002-7807.201504009 * Zhang Zhiyong, Zhang Xin, Wang Sufang , Bu Jingjing ( 453003, ) The relationships between increased ethylene levels induced by potassium deficiency and the inhibition of root elon- gating and branching of cotton, were investigated by treating roots and leaves of cotton seedlings in hydroponic cultures contain- ing ethylene precursor ACC (1-aminocyclopropane-1-carboxylic acid) and ethylene inhibitors AOA (aminooxyacetic acid), Co2+ + + and Ag , respectively. The addition of ACC to K -rich culture medium simulated the effects of K deficiency on root growth and branching, and aggravated the effects of K deficiency in K+-poor culture medium. In contrast, treatment with high concentrations of the ethylene synthesis inhibitor AOA decreased primary root length (PRL), lateral root length (LRL), and lateral root number + 2+ (LRN) under low K conditions, and this was similar for the ethyle