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远距离相关的植物中对气候进行重复的局部适应的遗传结构
James R Whiting1, Tom R Booker2,3, Clément Rougeux4
1Department of Biological Sciences, University of Calgary, Calgary, Alberta, Canada. jwhiting2315@gmail.com.
Nature ecology & evolution
|August 26, 2024
概括
密切相关的物种共享适应类似气候的基因. 这项研究发现,某些基因家族反复推动不同植物物种的气候适应,甚至超过数百万年.
科学领域:
- 进化生物学 进化生物学
- 基因组学就是基因组学.
- 适应气候变化 适应气候变化
背景情况:
- 密切相关的物种通常共享适应类似环境的基因.
- 在共享基因中增加适应潜力的进化基础及其在深层血统中保存的基础仍然不太清楚.
- 气候适应提供了一个模型系统来调查这些问题,因为不同的物种面临着类似的环境压力.
研究的目的:
- 研究植物在深层进化时期对气候的遗传适应的可重复性.
- 确定特定的基因家族和功能,这些基因家族和功能反复为当地气候适应做出贡献.
- 探索基因性和适应性遗传变异的重复性之间的关系.
主要方法:
- 重新分析了来自25种不同的植物物种的基因组数据,包括松和阿拉比多普西斯.
- 通过与21种气候变量相关联,测试基因可重复性,通过与21种气候变量相关联的物种内部等位基因频率变化.
- 利用基因共同表达网络来量化已识别的基因家族的类型和网络中心性.
主要成果:
- 显著的统计证据表明,在深远的进化时期,气候适应中的遗传重复性超过了随机预期.
- 识别了108个基因家族 (基因组) 和相关功能,这些基因家族反复推动了当地对气候的适应.
- 可重复的基因家族表现出更高的网络中心性和更广泛的组织表达 (多质量),挑战了"复杂性成本"理论.
结论:
- 特定的基因家族具有固有的适应潜力,在深层进化血统中反复被招募用于气候适应.
- 类型,而不是一个约束,可以促进重复适应,使基因能够响应各种环境压力.
- 这些重复作用的基因家族是提高野生和作物植物物种气候适应力的关键候选者.
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