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作 者:何梅[1,2] 施大伟[1] 胡玉安[2] 谢寅峰[1]
机构地区:[1]南京林业大学南方现代林业协同创新中心/生物与环境学院,江苏南京210037 [2]江西省林业科学院,江西南昌330032
出 处:《江西农业大学学报》2017年第6期1154-1162,共9页Acta Agriculturae Universitatis Jiangxiensis
基 金:国家自然科学基金项目(31300572);江西省科技厅重点研发项目(20161BBF60116);国家级大学生创新创业训练计划项目(201310298005);江苏高校优势学科建设工程资助项目(PAPD)~~
摘 要:采用2 a生"大佛指"雌雄银杏扦插苗,温室盆栽方法模拟自然干旱,研究干旱胁迫下银杏雌雄植株的生长及内源激素含量的性别差异。结果表明:(1)同一干旱胁迫阶段,雄性银杏叶片的萎蔫现象更加严重,株高和地径的增长量减小速度更快。雌性银杏表现出更好的生长情况。(2)同一干旱胁迫阶段,雌性银杏比雄性银杏具有更高含量的促进生长型内源激素IAA、GA_3和ZR,而抑制性内源激素ABA含量更低。(3)与雄性银杏相比,同一干旱阶段雌性银杏具有更高的IAA/ABA、GA_3/ABA、ZR/ABA比例和更低的GA_3/IAA比例。综上所述,干旱胁迫下,雌性银杏比雄性银杏具有更好的干旱适应性。另外干旱胁迫下雌性银杏比雄性银杏具有更高的株高和地径增长量可能是受生长型内源激素IAA含量及IAA/ABA、GA_3/IAA比例的影响。Using 2-year-old cutting seedlings Ginkgo biloba L. cv.‘Da Fozhi'( male and female),simulating the natural drought by means of greenhouse pot culture the growth and endogenous hormone contents of male and female Ginkgo biloba under drought stress were studied. The results showed that:( 1) At the same stage of drought treatment,the wilting phenomenon of male ginkgo leave was more serious,and the growth rate of plant height and ground diameter decreased faster.The female plants showed better growth than the male.( 2) At the same stage of drought treatment,the contents of promoting hormone IAA,GA_3 and ZR in the female plants were higher than those in the male plants and the content of inhibitory hormone ABA was lower than that of the male plants.( 3) Compared with the male,the female ginkgo had higher IAA/ABA,GA_3/ABA,ZR/ABA ratio and lower GA_3/IAA ratios in the same drought stage.The gender differences showed that the female ginkgo had better drought adaptability than the male.In addition,the plant height and ground diameter growth of the female ginkgo under drought stress were higher than those of the male ginkgo,which might be the effect of the contents of IAA and the ratios of GA_3/IAA,and IAA/ABA.
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