Population size as a major determinant of mating system and population genetic differentiation in a narrow endemic chasmophyte.
Population size as a major determinant of mating system and population genetic differentiation in a narrow endemic chasmophyte.
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DOI：
10.1186/s12870-023-04384-8
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发表时间：
2023-08-09
影响因子：
5.3
通讯作者：
Castro, Silvia
中科院分区：
文献类型：
--
作者：
Surina, Bostjan;Balant, Manica;Glasnovic, Peter;Radosavljevic, Ivan;Fiser, Ziva;Fujs, Natasa;Castro, Silvia
关键词：
交配系统是种内和种间遗传结构的主要决定因素之一，但在植物种群内和种群间可能存在差异。我们的研究模型包括了所有已知的毛石竹种群，这是一种栖息在亚得里亚海西北部岩石缝隙中的狭长特有植物，以及一些共生和广泛存在的种群，它是生态上不同的近亲，具有重叠的花期。我们进行了类群内部和类群之间的正反交，并使用分子标记来评估种群和类群内部和之间的基因流动程度。利用近交系数、群体大小、种子重、花粉胚珠比和花展示大小，我们还寻找了自交综合征的证据。在托马辛尼支原体的种群中观察到了令人惊讶的交配系统高度变异。这些群体表现出遗传结构，其大小与种子重量和花粉产量呈正相关。虽然自交综合征不能被证实，因为大多数自交是由异体交配治疗引起的，但自交的发生是值得注意的。在两个物种紧密共存的地点，在有番荔枝菌存在的情况下，在不同的授粉处理后，观察到Tommasinii的果实生产的明显模式。分子和形态计量学数据提供了杂交的证据，随后在这个地点发生了局部灭绝。结果表明，种群大小是影响遗传结构种群交配系统的最重要因素。在自交明显的种群中观察到的较轻的种子和较低的花粉产生并不能为自交综合症提供足够的证据。检测到的Tommasinii和共地的M.Muscoa之间的基因流动表明，这两个类群之间的生殖屏障很弱，这可能会给前者带来保护问题。杂交导致的局部灭绝也可能导致花的多态和交配模式的中断。网上版载有补充材料，可在10.1186/s12870-023-04384-8查阅。
Mating system is one of the major determinants of intra- and interspecific genetic structure, but may vary within and between plant populations. Our study model included all known populations of Moehringia tommasinii (Caryophyllaceae), a narrow endemic plant inhabiting rock crevices in the northwestern Adriatic, and some populations of co-occurring and widespread M. muscosa, an ecologically divergent relative with an overlapping flowering period. We performed reciprocal crosses within and between taxa and used molecular markers to assess the extent of gene flow within and between populations and taxa. Using coefficient of inbreeding, population size, seed weight, pollen-to-ovule ratio, and flower display size, we also looked for evidence of a selfing syndrome. A surprisingly high variation in mating systems was observed among populations of M. tommasinii. These populations exhibited genetic structuring, with their size positively correlated with both seed weight and pollen production. Although a selfing syndrome could not be confirmed as the majority of selfing resulted from allogamous treatments, the occurrence of selfing was notable. In the presence of M. muscosa, at a site where both species coexist closely, a distinct pattern of fruit production was observed in M. tommasinii following various pollination treatments. Molecular and morphometric data provided evidence of hybridization followed by local extinction at this site. Population size proved to be the most important factor affecting the mating system in genetically structured populations of M. tommasinii. Lighter seeds and lower pollen production observed in populations with pronounced selfing do not provide enough evidence for the selfing syndrome. Detected gene flow between M. tommasinii and the sympatric M. muscosa suggested weak reproductive barriers between the taxa, which could pose a conservation problems for the former species. Hybridization leading to local extinction may also resulted in floral polymorphism and disruption of mating patterns of M. tommasinii. The online version contains supplementary material available at 10.1186/s12870-023-04384-8.
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影响因子：
3.3
作者：
CHARLESWORTH, D;CHARLESWORTH, B
通讯作者：
CHARLESWORTH, B
影响因子：
3.3
作者：
Brys, Rein;Vanden Broeck, An;Jacquemyn, Hans
通讯作者：
Jacquemyn, Hans
影响因子：
2.1
作者：
Christopher DA;Karron JD;Semski WR;Smallwood PA;Trapnell DW;Mitchell RJ
通讯作者：
Mitchell RJ
影响因子：
1.1
作者：
Earl, Dent A.;vonHoldt, Bridgett M.
通讯作者：
vonHoldt, Bridgett M.
影响因子：
1.1
作者：
Coates, David J.;Williams, Matthew R.;Madden, Sally
通讯作者：
Madden, Sally