斯特里戈拉克顿抑制了芽生长的分枝
Victoria Gomez-Roldan1, Soraya Fermas, Philip B Brewer
1Université de Toulouse, UPS, CNRS, Surface Cellulaire et Signalisation chez les Végétaux, 24 chemin de Borde Rouge, F-31326 Castanet-Tolosan, France.
Nature
|August 12, 2008
概括
植物激素信号抑制树枝的分枝被确定为strigolactones. 对胡卜素裂变二氧化原酶8突变体施加格拉克恢复了正常的分枝,证实了它们在植物发育中的作用.
科学领域:
- 植物生物学 植物生物学
- 激素信号传递 激素信号传递
- 生物化学 生化学
背景情况:
- 植物发芽分枝是一个由荷尔蒙信号调节的关键发育过程.
- 一个关键的信号分子,来自胡卜素,它抑制了树枝的分支,一直未被确定.
- 已知strigolactones可以影响寄生植物发芽和共生真菌.
研究的目的:
- 为了识别长期寻找的激素信号,抑制植物芽的分枝.
- 为了调查strigolactones在调节射击架构中的作用.
- 为了确定胡卜素分裂氧化酶8 (ccd8) 突变体是否缺乏这种荷尔蒙信号.
主要方法:
- 对影响发芽分枝的豆 (ccd8) 突变物进行遗传分析.
- 生物化学测定用于评估野生类型和突变植物中的strigolactone水平.
- 对突变系的外源性strigolactones的应用,以观察表型的救援.
- 在模型植物Arabidopsis thaliana的保护研究.
主要成果:
- 培根ccd8突变体表现出strigolactone缺乏和改变的芽分枝.
- 斯特里戈拉克的应用恢复了ccd8突变体中野生类型的分支表型.
- 对分支抑制信号无反应的突变体也缺乏strigolactone反应,这表明保存的途径.
- 外源性斯特里戈拉克顿在低度下表现出在芽中可运输性和活性.
结论:
- 内源性排球菌被确定为激素信号,抑制植物中芽的分枝.
- 该ccd8基因对于strigolactone生物合成至关重要,影响着发芽的发展.
- 斯特里戈拉克顿在植物发育中发挥着多种作用,包括芽生长的分支,菌根的共生,以及与寄生虫杂草的相互作用.
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