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对两种双胞胎Paspalum物种 (Poaceae) 的分子和形态多样性的比较分析,具有对比的交配系统

A Verena Reutemann¹, Ana I Honfi², Piyal Karunarathne^3,4

¹Instituto de Botánica del Nordeste (IBONE-CONICET-UNNE), Facultad de Ciencias Agrarias, Universidad Nacional del Nordeste (FCA-UNNE), 3400, Corrientes, Argentina.

Plant reproduction

|August 11, 2023

概括

交配系统影响植物变异. 自制的Paspalum pumilum表现出更多的形态多样性,但基因多样性比超越的Paspalum indecorum少.

科学领域:

进化生物学进化生物学
植物遗传学植物遗传学
人口动态人口动态

背景情况:

交配系统对植物种群中的遗传和形态多样性产生重大影响.
之前的研究往往忽视了形态多样性,当检查自我与外交物种时.
了解这些差异对于植物进化研究至关重要.

研究的目的:

为了比较两个相关的Paspalum物种与对比的交配系统的形态和分子多样性模式.
研究自我和外交如何影响人群内部和人群间的变化.
为了澄清不同交配策略的不同进化结果.

主要方法:

在Paspalum indecorum (自我无菌) 和Paspalum pumilum (自我肥沃) 中使用16个形态现象学特征评估了形态变异.
分析了分子多样性,使用三种扩大片段长度多态 (AFLP) 组合.
对每个交配系统的种群内部和种群之间的多样性模式进行比较.

主要成果:

与预期相反,P. pumilum表现出较高的人口内部形态变异,而不是超越P. indecorum.
与外交种群 (Phi_ST = 0.108) 相比,自我种群的基因型和遗传多样性较低,人口结构更高 (Phi_ST = 0.301).
自我增加了同卵性组合,增强了形态变异,同时减少了分子变异,导致这些多样性类型的结果相反.

结论:

在P. pumilum中自杀导致形态变异增加和种群内的分子多样性减少.
在受花粉流的影响下,P. indecorum的外交增加了分子变异,但在种群内均化了表型.
交配系统对形态和分子多样性有着不同的,有时是相反的影响,塑造了种群遗传结构.

关键词:

基因流动是基因的流动.配对系统的配对系统.分子变化的分子变化.形态变化的形态变化.人口结构人口结构性生活性生活性生活性生活

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