这一切都取决于时间:植物阶段的变化改变了干旱期间的选择,并有助于当地适应
Erica H Lawrence-Paul1, Jessica Janakiraman1, Matthew R Lawrence-Paul2
1Department of Biology Pennsylvania State University University Park, PA 16802 USA.
bioRxiv : the preprint server for biology
|June 4, 2025
概括
植物发育的时间,特别是从幼虫到成人的植物阶段变化 (VPC),对于适应干旱至关重要. 发育阶段之间的权衡维持了自然种群中的遗传多样性.
科学领域:
- 植物生物学 植物生物学
- 进化遗传学的进化遗传学
- 生态生态学 生态生态学
背景情况:
- 发展时间对于环境适应至关重要,使敏感和耐受性生命阶段与季节性条件保持一致.
- 现象时间,如发芽和开花,已被广泛研究,但青少年到成年人植物阶段变化 (VPC) 的理解较少.
- 发展性权衡可以通过在不同环境条件下平衡适应性来维持种群内的遗传多样性.
研究的目的:
- 调查青少年到成年人植物阶段变化 (VPC) 时间在干旱适应中的作用.
- 确定与VPC时间和特定阶段干旱反应相关的遗传基因位置.
- 探索不同生命阶段的发育权衡如何影响植物种群的遗传变异.
主要方法:
- 测试了158种不同的*Arabidopsis thaliana*基因型,在幼年或成年植物阶段的干旱压力下,与水分充足的对照进行了测试.
- 测量了植物的性能,生理学和发育过渡的时间.
- 利用全基因组关联映射来识别候选基因,并分析这些位置的地理变异.
主要成果:
- 显著的基因型-环境相互作用揭示了青少年和成年阶段之间的干旱适应权衡,青少年干旱导致更大的健康减少.
- 成年植物在干旱期间提高了用水效率,而年轻植物没有,这表明阶段特定的可塑性.
- VPC计时显示全球气候相关性较弱,但趋向于在干燥气候中较早计时,在伊比利亚半岛潮湿气候中较晚计时.
- 遗传分析表明,与VPC时间和幼虫干旱适应性相关的权衡在整个范围内的*Arabidopsis*种群中得到维持.
结论:
- 青少年到成人生长阶段变化的时间 (VPC) 是适应干旱反应的重要因素.
- 青春期和成年期之间的发展权衡有助于保持自然植物种群的遗传多样性.
- 了解VPC时间和特定阶段的应激反应是预测植物适应环境变化的关键.
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