普莱托拉梯度形成机制分离了auxin反应.
Ari Pekka Mähönen1,2,3, Kirsten Ten Tusscher4, Riccardo Siligato1,3
1Institute of Biotechnology, University of Helsinki, Helsinki 00014, Finland.
Nature
|August 27, 2014
概括
植物根保持稳定的发育区域,并通过auxin和PLETHORA (PLT) 转录因子之间的复杂相互作用来适应生长方向. 这种机制确保了在环境反应过程中协调细胞分化.
科学领域:
- 植物生物学 植物生物学
- 发展生物学 发展生物学
- 分子生物学分子生物学
背景情况:
- 植物生长需要细胞分裂,扩张和分化之间的协调,从而建立不同的发育区.
- 植物表现出热带,根据环境线索调整生长方向,但在这些调整过程中维持区分并未得到充分理解.
- 辅酶和PLETHORA (PLT) 转录因子,对于阿拉比多普西斯的根区分和热带变化至关重要,在根尖附近呈现分级分布.
研究的目的:
- 阐明辅酶和PLT控制植物根区分和重力的调节机制.
- 研究如何在增长方向的短暂变化期间保持稳定的发育区分.
主要方法:
- 使用了一种代的实验和计算方法.
- 分析了auxin梯度和PLT转录因子分布之间的相互作用.
- 通过生长稀释和细胞间移动研究了PLT蛋白梯度的动态.
主要成果:
- PLT梯度不是auxin梯度的直接反映;长时间的高auxin水平建立了一个狭窄的PLT转录域.
- 随后通过生长稀释和细胞间移动形成一个PLT蛋白梯度,定义发育区边界.
- 辅酶影响PLT转录缓慢,同时迅速影响细胞分裂,扩张和分化速率.
结论:
- 辅酶和PLT的协调作用,在不同的时间尺度和通过不同的机制运作,使得快速的热带反应和稳定的区域化.
- 这种监管系统确保了植物发育和适应所必需的协调细胞分化.
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