Asymmetric Reproductive Barriers and Gene Flow Promote the Rise of a Stable Hybrid Zone in the Mediterranean High Mountain.
Asymmetric Reproductive Barriers and Gene Flow Promote the Rise of a Stable Hybrid Zone in the Mediterranean High Mountain.
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DOI：
10.3389/fpls.2021.687094
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发表时间：
2021
影响因子：
5.6
通讯作者：
Perfectti F
中科院分区：
文献类型：
--
作者：
Abdelaziz M;Muñoz-Pajares AJ;Berbel M;García-Muñoz A;Gómez JM;Perfectti F
杂交区有可能阐明推动适应和物种形成的进化过程。次级接触杂交区是特别强大的自然系统，用于研究不同基因组之间的相互作用，以了解在物种形成过程中生殖隔离积累的方式和速度。我们对内华达山脉(西班牙东南部)2个十字花科植物的5个种群的720种植物进行了研究。这些植物在2007年和2017年进行了表型鉴定，其中大多数在第一年就使用了10个微卫星标记进行了基因鉴定。来自自然种群的植物被种植在一个共同的花园中，通过控制杂交的方法来评估两个物种之间的生殖障碍。所有用于田间和温室研究的植物的特征都是测量与植株大小和花大小有关的性状。通过F-统计量和贝叶斯推断估计遗传分子方差、遗传分化和遗传结构。我们还估计了种群之间最近的基因流动的数量。我们发现了一个狭窄的单峰杂交区，在那里杂交种似乎是通过来自亲本群体的显著水平的单向基因流以及来自亲本群体之间的弱生殖隔离来维持的。根据所分析的性状，杂交植株表现出中等或强健的表型。在田间试验和对照杂交试验中，杂交植株和亲本之间的表型差异在时间上是高度一致的。结合野外、实验和遗传数据得到的高度一致的结果表明，在内华达山脉的高海拔地区，存在一个稳定而狭窄的单峰杂交带。
Hybrid zones have the potential to shed light on evolutionary processes driving adaptation and speciation. Secondary contact hybrid zones are particularly powerful natural systems for studying the interaction between divergent genomes to understand the mode and rate at which reproductive isolation accumulates during speciation. We have studied a total of 720 plants belonging to five populations from two Erysimum (Brassicaceae) species presenting a contact zone in the Sierra Nevada mountains (SE Spain). The plants were phenotyped in 2007 and 2017, and most of them were genotyped the first year using 10 microsatellite markers. Plants coming from natural populations were grown in a common garden to evaluate the reproductive barriers between both species by means of controlled crosses. All the plants used for the field and greenhouse study were characterized by measuring traits related to plant size and flower size. We estimated the genetic molecular variances, the genetic differentiation, and the genetic structure by means of the F-statistic and Bayesian inference. We also estimated the amount of recent gene flow between populations. We found a narrow unimodal hybrid zone where the hybrid genotypes appear to have been maintained by significant levels of a unidirectional gene flow coming from parental populations and from weak reproductive isolation between them. Hybrid plants exhibited intermediate or vigorous phenotypes depending on the analyzed trait. The phenotypic differences between the hybrid and the parental plants were highly coherent between the field and controlled cross experiments and through time. The highly coherent results obtained by combining field, experimental, and genetic data demonstrate the existence of a stable and narrow unimodal hybrid zone between Erysimum mediohispanicum and Erysimum nevadense at the high elevation of the Sierra Nevada mountains.
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影响因子：
2.1
作者：
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通讯作者：
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