外源IAA对高粱幼苗内源激素含量及分蘖发生的影响  

Effects of exogenous IAA application on endogenous hormone contents and tillering in sorghum

作　　者：周宇飞[1,2] 闫彤[1] 张姣[1] 王艺陶 王娜[1] 吴奇[1] 孙飞[1] 许文娟[1] 黄瑞冬[1] 

机构地区：[1]沈阳农业大学农学院,沈阳110866 [2]高粱遗传与种质创新山西省重点实验室,山西晋中030600 [3]辽宁省农业环境保护监测站,沈阳110034

出　　处：《生态学杂志》2017年第8期2191-2197,共7页Chinese Journal of Ecology

基　　金：现代农业产业技术体系建设专项资金资助项目(CARS-06-02-02);国家科技支撑计划项目(2014BAD07B02);高粱遗传与种质创新山西省重点实验室开放课题(2015K-02);辽宁省教育厅一般项目(L2014271)资助

摘　　要：本试验以高粱品种"辽杂10"和"辽杂19"为试验材料,分别用0、100和200mg·L-13个浓度的IAA在高粱三叶期进行叶面喷施,研究外源IAA喷施对高粱内源激素含量及分蘖发生的影响。结果表明:喷施外源IAA在短时期内可以显著影响高粱内源激素的含量,喷施3 d后,高粱内源IAA和GA3含量显著升高,ZR和ABA含量显著降低;喷施6 d后,高粱内源IAA、GA3和ABA含量明显回落,而ZR含量明显升高;外源IAA提高了高粱分蘖节第一和第四节位分蘖发生的概率,降低了第二节位分蘖发生的概率;外源IAA抑制了单株多个分蘖的产生,减少了单株2~3个分蘖发生的概率,使单株1个分蘖发生的概率有所增加;同时,外源IAA降低了高粱分蘖发生和无效分蘖产生的概率;外源IAA提高了高粱穗长、千粒重及穗粒重等主要农艺性状,对高粱产量的提升起到一定的促进作用。Two sorghum varieties （Liaoza 10 and Liaoza 19） were used as the plant materials and exogenous auxin （IAA） was sprayed on the plant leaves at the threeleaf stage with three concentrations of exogenous IAA （0, 100, 200 mg·L-1, respectively）. Effects of exogenous IAA application on endogenous hormone contents and tillering in sorghum were determined. Results showed that exogenous IAA application significantly affected the endogenous hormone contents of sorghum. Exogenous IAA application substantially increased endogenous IAA and gibberellic acid 3 （GA3） contents but decreased zeatin riboside （ZR） and abscisic acid （ABA） contents in sorghum 3 days after spraying IAA. Endogenous IAA, GA3 and ABA contents obviously declined but ZR content increased 6 days after the treatment of IAA. The exogenous IAA enhanced the probability of tillering at the first and fourth tillering nodes and decreased the probability of tillering at the second tillering node in sorghum. The exogenous IAA application inhibited the occurrence of multitillers by increasing the probability of a single tiller per plant. Meanwhile, the exogenous IAA reduced the tillering incidence and ineffective tillering rate. Exogenous IAA application increased the sorghum yield by promoting the main agronomic characteristics including panicle length, 1000grain weight, and grain weight per panicle.

关 键 词：高粱 外源IAA 内源激素 分蘖 

分 类 号：S514[农业科学—作物学]