外源GA_3、ABA对杂交水稻亲本穗上发芽的生理影响  

Effects of Exogenous GA_3 and ABA on Physiological Change of Preharvest Sprouting in Hybrid Rice

作　　者：周述波[1,2] 贺立红[3] 林伟[1] 戴高兴[2,4] 

机构地区：[1]琼州学院生物科学与技术学院,海南三亚572022 [2]湖南农业大学植物激素与生长发育重点实验室,长沙410128 [3]仲恺农业工程学院生命科学学院,广州510225 [4]广西农业科学院水稻研究所,南宁530007

出　　处：《湖北农业科学》2011年第21期4330-4333,共4页Hubei Agricultural Sciences

基　　金：教育部青年骨干教师基金项目(200065);海南省三亚市院地科技合作项目(2010YD19)

摘　　要：以杂交水稻亲本V20B为材料,研究了外源GA3、ABA处理后对杂交水稻穗上发芽的生理生化变化。结果表明,外源GA3作用改变了内源GA3水平,提高了GA3/ABA比值、α-淀粉酶活性和可溶性糖含量,使淀粉类物质降解加速和田间种子不经休眠直接在穗上发芽。经外源ABA处理后,V20B的穗芽率明显降低,内源ABA含量提高,促进了种子的休眠,抑制了穗上发芽;外源ABA降低了子粒中内源IAA含量。Hybrid rice parent line V20B was used as experimental material,and effect of exogenous GA3 and ABA on physiological characters of preharvest sprouting of hybrid rice in field was studied.The results showed that exogenous GA3 led to the change of endogenous GA3 and caused increase of the ratio of GA3/ABA,α-amylases activity and soluble sugar content.GA3 application also enhanced starch decomposition,broke seed dormancy and led to early preharvest sprouting.Exogenous ABA treatment on V20B decreased preharvest sprouting,increased endogenous ABA content and enhanced seed dormancy.The exogenous ABA decreased endogenous IAA content

关 键 词：杂交水稻 穗上发芽 内源激素 Α-淀粉酶 可溶性糖 

分 类 号：Q945.34[生物学—植物学]