Unravelling the genetic diversity and population dynamics of three Tacinga species (Cactaceae: Opuntioideae) in the Caatinga

IF 2.3 2区 生物学 Q2 PLANT SCIENCES
Dora Yovana Barrios-Leal, Rodolpho S T Menezes, Daniela Zappi, Maura Helena Manfrin
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引用次数: 0

Abstract

Abstract The Caatinga biogeographical region, located in the semi-arid region of northeastern Brazil, is characterized by high levels of cactus diversity and endemism. In this study, we investigated the genetic diversity, differentiation, and phylogeography of three Tacinga species (Tacinga inamoena, Tacinga subcylindrica, and Tacinga palmadora), which are endemic and widely distributed in the Caatinga. We collected 222 samples from 108 locations and used plastid (3ʹrps16-5ʹtrnK, PsbE-PetL) and nuclear (PhyC) molecular markers for a multilocus approach. Our results suggest that diversification of the three Tacinga species occurred during the middle Pleistocene, with the Southern Sertaneja Depression ecoregion of the Caatinga being identified as the ancestral area. Interestingly, analyses of genetic structure did not show any evidence that the major river in the region (the Sao Francisco River) and the Caatinga ecoregions acted as biogeographical barriers for gene flow in these species. This suggests that the three Tacinga species exhibited different responses to widely accepted geographical and geomorphological barriers known to affect other taxonomic groups in the Caatinga. Overall, our findings provide new insights into the biogeographical history of the Caatinga and the factors that have shaped diversification and genetic structure of species in this region. Our study underlines the importance of considering the unique natural history and biological characteristics of individual taxonomic groups when investigating the biogeography of the Caatinga.
研究了加廷加地区3个加廷加物种的遗传多样性和种群动态
Caatinga生物地理区位于巴西东北部的半干旱区,仙人掌具有较高的多样性和地方性特征。本研究对分布于加廷加地区的3个特有物种(Tacinga inamoena、Tacinga subica和Tacinga palmadora)的遗传多样性、分化特征和系统地理特征进行了研究。我们收集了来自108个地点的222份样本,使用质体(3′rps16-5′trnK, PsbE-PetL)和核(PhyC)分子标记进行多位点方法。结果表明,三种Tacinga物种的多样化发生在中更新世,并确定了Caatinga的南Sertaneja坳陷生态区域为其祖先区。有趣的是,遗传结构分析并没有显示出该地区的主要河流(圣弗朗西斯科河)和Caatinga生态区对这些物种的基因流动起到生物地理障碍的任何证据。这表明三个Tacinga物种对影响Caatinga其他分类类群的地理和地貌障碍表现出不同的响应。总的来说,我们的发现为Caatinga的生物地理历史以及形成该地区物种多样性和遗传结构的因素提供了新的见解。我们的研究强调了在研究Caatinga的生物地理学时考虑单个分类类群独特的自然历史和生物学特征的重要性。
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来源期刊
CiteScore
5.70
自引率
8.30%
发文量
54
审稿时长
3.5 months
期刊介绍: The Botanical Journal of the Linnean Society publishes original papers on systematic and evolutionary botany and comparative studies of both living and fossil plants. Review papers are also welcomed which integrate fields such as cytology, morphogenesis, palynology and phytochemistry into a taxonomic framework. The Journal will only publish new taxa in exceptional circumstances or as part of larger monographic or phylogenetic revisions.
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