Species cohesion of an extremophyte (Carex angustisquama, Cyperaceae) in solfatara fields maintained under interspecific natural hybridization
Species cohesion of an extremophyte (Carex angustisquama, Cyperaceae) in solfatara fields maintained under interspecific natural hybridization
复制标题
种间自然杂交下硫磺草田中极生植物（苔草、莎草科）的物种凝聚力
DOI：
10.1093/aob/mcab069
复制
发表时间：
2021
期刊：
影响因子：
4.2
通讯作者：
Shota Sakaguchi
中科院分区：
文献类型：
--
作者：
Koki Nagasawa;Hiroaki Setoguchi;Masayuki Maki;Kazuhiro Sawa;Kenji Horie;Shota Sakaguchi
研究背景与目的杂交是植物多样化的主要驱动力，通过杂交实现的基因流对植物进化具有多方面的影响。尽管它的栖息地不同于其他物种，这个物种是已知的形成种间杂种，这意味着种间基因流。因此，研究C.方法利用表达序列标签-简单重复序列标记技术，对狭鳞藻（C. angustisquamaL.）KeyResultsBayesian聚类分析和模拟分析表明，三个杂交种的所有个体都被分类到C. angustisquama;因此，目前种间基因流是有限的。此外，在贝叶斯推断的历史基因流的基础上，多物种样本，模型，假设没有种间基因流是最强烈的支持，在所有物种对，包括近缘遗传，但生态独特的物种pairs.ConclusionsOur结果表明，种间基因流之间的C。狭鳞属及其近缘种在历史上和现在都受到限制。此外，我们的贝叶斯推断的历史基因流的结果表明，外在的，而不是内在的，因素可能作为隔离barriers betweenCarexspecies，通过微生境隔离的混合故障是可能的潜在障碍。总的来说，我们的研究结果提供了深入了解的极端植物在solfatara领域的进化过程，并提供了一个重要的例子speciose genusCarex的多样化的机制。
Background and AimsHybridization is the main driver of plant diversification, and gene flow via hybridization has multifaceted effects on plant evolution.Carex angustisquamais an extremophyte that grows on soils heavily acidified by volcanism. Despite its habitat distinct from that of other species, this species is known to form interspecific hybrids, implying interspecific gene flow. It is crucial to verify the extent and direction of interspecific gene flow betweenC. angustisquamaand closely related species to understand the evolutionary process of an extremophyte in solfatara fields.MethodsIn this study, expressed sequence tag–simple sequence repeat markers were utilized to infer the extent and direction of interspecific gene flow betweenC. angustisquamaand closely related species.Key ResultsBayesian clustering and simulation analyses revealed that all individuals of the three hybrid species were classified into the first hybrid generation or first backcross toC. angustisquama; therefore, current interspecific gene flow is limited. Moreover, in the Bayesian inference of historical gene flow based on multispecies samples, the model that assumed no interspecific gene flow was the most strongly supported across all species pairs, including phylogenetically close but ecologically distinctive species pairs.ConclusionsOur results revealed that interspecific gene flow betweenC. angustisquamaand its related species has been limited both currently and historically. Moreover, our results of Bayesian inference of historical gene flow indicated that extrinsic, rather than intrinsic, factors probably act as isolating barriers betweenCarexspecies, with hybrid breakdown via microhabitat segregation being the probable potential barrier. Overall, our findings provide insights into the evolutionary process of an extremophyte in solfatara fields and offer an important example of the mechanisms of diversification of the speciose genusCarex.