杉木花芽分化过程中含氮化合物和内源激素的作用*

杉木雄球花芽分化中前期核酸含量比雌球花芽和叶第高17%~33%,后期雄的下降而雌的上升。RNA/DNA前期为2~3,后期为5~6。初期花芽的蛋白质含量与叶茅相近,随后增加。花芽中有16种氨基酸,脯氨酸与花芽分化关系密切。雄球花芽发生赤霉酸(GA3)水平很高而脱落酸(ABA)很低。雌球花芽的GA3稍低于叶茅而ABA相近。开花时的雌球花ABA显著减少而雄球花ABA、引味乙酸(IAA)上升,GA3下降。花茅中玉米素(ZT)变化平稳,仅略高于叶芽。文章讨论了花茅分化与各类含氮物质及其内源激素的生理作用。

Function of Azotico Compounds and Phytohormones In Flower Bud Differentiation of Chinese Fir.

In the early medium stage of differentiation,nucleic acid content in male buds is higher by 17% and 33% than that in female buds and leaf buds.In late stage,the content in male bud decreases while in female ones it increases.RNA/DNA ratio is 2~3 in early stage and 5~6 in Iate stage.There's no remarkable change in Protein Ievel.16 free amino acids can be found in various flower buds,among which Proline content is always very high and is closely related to flower bud in intiation and development.GA3 levels(FW)are as high as 50~90ugg-1 while ABA is as low as 1ugg-1 in the initiation of male buds。During the differentiation of female buds,GA3 and ABA are only a little.lower than those in leaf buds and their changes are mild.During flowering,feamle ABA notably decreases while male ABA greatly increases and GA3 decreases.