周期 D 控制植物生长速度的控制
C E Cockcroft1, B G den Boer, J M Healy
1Institute of Biotechnology, University of Cambridge, UK.
Nature
|June 13, 2000
概括
植物生长是由细胞分裂率控制的. 转基因烟草植物中更快的细胞循环导致了增长加速,叶子发育增加和更快的发育,这表明细胞分裂是植物发育的关键因素.
科学领域:
- 植物生物学 植物生物学
- 分子生物学分子生物学
- 发展生物学 发展生物学
背景情况:
- 人们对植物生长调节的了解很少,假定其中涉及的是细胞系 (细胞分裂缩的区域).
- 细胞分裂在美里系统活动和植物生长速度中的作用是有争议的,有些人将其视为对其他控制的次要因素.
研究的目的:
- 研究细胞分裂速率在确定植物体活动和整体生长速度方面的作用.
- 为了确定调节细胞分裂是否能影响植物的发育和生长.
主要方法:
- 使用的转基因烟草植物增加了植物D型环林CycD2.2.的表达.
- 分析了细胞周期的持续时间,体大小,生长率,叶子发育率和发育时间.
主要成果:
- 增加的CycD2表达减少了细胞周期G1阶段,导致更快的细胞循环.
- 转基因植物表现出正常的细胞和体大小,但显著提高了生长速度.
- 从幼苗到成熟的各个阶段都观察到加速的发育,包括增加的叶子发育率.
结论:
- 细胞分裂速率是 меристем活动和整体植物生长的主要决定因素.
- 植物生长速度调节是通过细胞周期的调节来实现的,特别是G1阶段.
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