Genetic, morphological, and niche variation in the widely hybridizing Rhus integrifolia‐Rhus ovata species complex
Genetic, morphological, and niche variation in the widely hybridizing Rhus integrifolia‐Rhus ovata species complex
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广泛杂交的大叶漆树-卵形漆树物种复合体的遗传、形态和生态位变异
DOI：
10.1111/1442-1984.12293
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发表时间：
2021
影响因子：
1.4
通讯作者：
Thixton, Hana
中科院分区：
文献类型：
--
作者：
Barrett, Craig F.;Lambert, Joshua;Santee, Mathilda V.;Sinn, Brandon T.;Skibicki, Samuel V.;Stephens, Heather M.;Thixton, Hana
杂交和渐渗是许多植物物种的共同过程，这对物种划分、植物遗传学、分类学和适应性研究既带来了挑战，也带来了机遇。卵叶灌木是两种生态上重要的灌木，原产于美国西南部和墨西哥，并被认为是杂交频繁，但在这些物种的杂交形态，遗传和生态意义的研究很少在广泛的地理范围。利用叶片形态，质体和核基因座的遗传变异，和物种分布模型进行分析，这两个物种和它们的假定的杂交渐渗在19个地点在加州和亚利桑那州，美国。这些分析揭示了包括假定亲本物种的地方之间的形态和遗传差异的证据，但具有假定杂交种的地方之间的高度形态遗传中介性。不同地区的形态和遗传种群结构的比较显示了假定的地方适应或广泛的表型可塑性的证据。多元回归模型发现叶面积与降水量之间存在微弱但统计学显着的负相关性。最后，物种分布模型推断，随着时间的推移，北移的范围，这两个物种预计将占据更多的沿海地区，在未来，可能会增加它们之间的杂交频率。这些发现强调了在杂交物种研究中多个数据源的综合评估的重要性，并强调了R。integrifolia‐ovatacomplex作为一个强大的模型研究杂交的适应性影响。
Hybridization and introgression are common processes among numerous plant species that present both challenges and opportunities for studies of species delimitation, phylogenetics, taxonomy and adaptation.Rhus integrifoliaandR. ovataare two ecologically important shrubs native to the southwestern USA and Mexico, and are known to hybridize frequently, but the morphological, genetic and ecological implications of hybridization in these species are poorly studied on a broad geographic scale. Analyses were conducted using leaf morphology, genetic variation of plastid and nuclear loci, and species distribution models for both species and their putative hybrid introgressants across 19 localities in California and Arizona, USA. These analyses revealed evidence for morphological and genetic distinction among localities comprising putative parental species, but a high degree of morpho‐genetic intermediacy among localities with putative hybrids. Comparison of morphological and genetic population structure among localities revealed evidence for putative local adaptation or widespread phenotypic plasticity. Multiple regression models identified a weak but statistically significant negative association between leaf area and precipitation. Finally, species distribution modeling inferred northward range shifts over time, with both species predicted to occupy more coastal regions in the future, possibly increasing the frequency of hybridization among them. These findings underscore the importance of integrative assessment of multiple data sources in the study of hybridizing species and highlight theR. integrifolia‐ovatacomplex as a powerful model for investigating the adaptive implications of hybridization.