三裂叶豚草雄花序分化期ABA、GAs和IAA的含量动态

【背景】三裂叶豚草为我国外来入侵有害植物,是世界公认的危害性杂草,不仅影响农牧业的生产,而且其花粉含有致敏蛋白,能引起人体一系列的过敏反应,危害人类健康。植物内源激素与植物生长发育的基本规律和代谢过程的调节控制密切相关。【方法】本文利用高效液相色谱法,研究了三裂叶豚草雄花序分化过程中3种内源激素的含量动态。【结果】在三裂叶豚草雄花芽分化过程中,赤霉素(GAs)的含量在分化初期比较平稳,从花蕾分化期开始急剧下降,雄蕊分化期又上升;吲哚乙酸(IAA)的含量始终处于缓慢上升的趋势;脱落酸(ABA)在花瓣分化期出现且迅速上升,在雄蕊分化末期达到峰值。3种激素中,ABA含量与三裂叶豚草花芽分化的相关性较明显。【结论与意义】ABA的出现及其含量是决定三裂叶豚草雄花序分化能否完成的一个关键因素。本研究为利用化学方法防治三裂叶豚草提供了依据。

Changes of three plant hormones during male inflorescence differentiation of Ambrosia trifida

Background]Ambrosia trifida L.is a harmful weed all over the world,causing harm to human health,farming as well as animal husbandry.Method]The contents of three endogenous hormones gibberellic acid(GAs),indoles-3-acetic acid(IAA),and abscisic acid(ABA) were examined by high-performance liquid chromatography(HPLC).Result]During the flower bud differentiation,and during the middle of flower bud differentiation,the content of GAs lowered and increased at the later stage.The content of IAA increased constantly.The amount of ABA increased fast at the later stage.Conclusion and significance]ABA seemed to be the most important hormon during flower bud differentiation.The study will provide reference for chemical control of the ragweed.