喷施GA_3和2,4-D对留树保鲜脐橙落果和内源激素含量的影响  

Effect of Spraying GA_3 and 2,4-D on Fruit Drop and Endogenous Hormone Content of Navel Orange

作　　者：王雄[1] 陈金印[1] 刘善军[1] 

机构地区：[1]江西农业大学果蔬保鲜与无损检测重点实验室,南昌330045

出　　处：《园艺学报》2012年第3期539-544,共6页Acta Horticulturae Sinica

基　　金：国家‘十一五’科技支撑计划项目(2007BAD61B07)

摘　　要：以纽荷尔脐橙(Newhall Navel Orange)为试材,测定喷施GA3和2,4-D的植株留树保鲜果实的落果率和果实内源赤霉素(GA)、生长素(IAA)、玉米素核苷(ZR)、脱落酸(ABA)含量的变化,探讨内源激素与留树保鲜脐橙落果的关系。结果表明:植物生长调节剂处理能降低果实内源GA、IAA、ZR含量下降的速度,减缓内源ABA及ABA/(GA+IAA+ZR)的升高,减少留树保鲜过程中的落果,其中以20mg·L-1GA3+20mg·L-12,4-D混合处理的效果最好,且留树保鲜应以60d左右为宜。初步分析认为内源GA、IAA、ZR含量的下降,内源ABA及ABA/(GA+IAA+ZR)的升高加速了果实离层的产生,共同促进了留树保鲜脐橙果实的衰老脱落。To observe the relationship between endogenous hormone and fruit drop of Newhall Navel Orange,the changes of gibberellin（GA）,auxin（IAA）,zeatin riboside（ZR）and abscisic acid（ABA） contents in navel oranges were assayed after spraying GA3 and 2,4-D during on-tree storage. The results showed that plant regulators could effectively reduce the fruits abscission through decreasing the GA,IAA and ZR contents and increasing ABA and the ratio of ABA to total contents of GA,IAA and ZR. And the most effective treatment was achieved when a mixture of 20 mg · L-1 GA3 and 20 mg · L-1 2,4-D was applied. The fruits were able to remain of good quality after 60 days,on-tree preservation. The results indicated that a combination of descending endogenous GA,IAA,ZR and decreasing ABA and ratio of ABA to total contents of GA,IAA and ZR accelerated the production of the apolexis,thus delayed the ripening and dropping of navel orange during on-tree storage.

关 键 词：脐橙 植物生长调节剂 留树保鲜 内源激素 落果率 

分 类 号：S666[农业科学—果树学]