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Genetic and morphological diversity and population structure of a polyploid complex of Mimosa (Leguminosae)
Systematics and Biodiversity ( IF 1.9 ) Pub Date : 2019-12-23 , DOI: 10.1080/14772000.2019.1696421
Matías Morales 1, 2, 3 , Florencia Giannoni 2 , María V. Inza 1 , MaríA C. Soldati 1 , Cecilia F. Bessega 2, 4 , Lidia Poggio 2, 4 , Noga Zelener 5 , Renée H. Fortunato 1, 2, 3
Affiliation  

Evolutionary processes in plants such as hybridization and polyploidy are relevant to speciation and little studied in subtropical South America. In subtropical South America, the genus Mimosa is highly diverse, comprising 30% of polyploid species. The origin and genetic and morphological structure of polyploids in Mimosa are only very recently investigated, as well as their relevance to speciation, morphological variation, and distribution. Mimosa subser. Dolentes–Brevipedes, a taxonomic complex from that region, exhibits polyploidy, with specific and infraspecific taxa confusedly circumscribed. Studies of its population biology would facilitate the elucidation of evolutionary processes in Mimosa and resolution of taxonomic conflicts. We performed a multidisciplinary study of this complex, analysing seven populations and 87 individuals by means of morphometry, and AFLP fingerprinting throughout its area of distribution. Five populations included several taxa and intermediate individuals. Morphometric analyses revealed three clusters, distinguished mainly by leaf morphology and inflorescence. One population was tetraploid, one was tetraploid/octoploid and the rest octoploid. Genetic differentiation was high (PhiPT = 0.277) and expected heterozygosity was moderate (He = 0.190; H = 0.271). Multivariate molecular analyses revealed genetic divergence between highland and lowland grasslands. Structural genetic analyses revealed three clusters: two mixed, distinctly predominant in lowland/highland grasslands; another, exclusively from Mercedes. Molecular analysis of variance showed significant differences between highland/lowland grasslands and cytotypes. Cytotypes and populations differed partially by morphology. Tetraploids were morphologically similar to the sympatric octoploids, showing similar genetic structure and gene flow; furthermore, tetraploids are involved in origin of these higher polyploids. The systematics of this complex requires revision: subseries Dolentes and some Brevipedes species could be considered as one subseries. Admixture of genetic clusters and intermediates can be explained by hybridization and introgression. A marginal population differed from the others by morphology and genetics thus suggesting incipient speciation at the geographic edges of this complex.

中文翻译:

含羞草(豆科)多倍体复合体的遗传和形态多样性及种群结构

植物的进化过程,如杂交和多倍体,与物种形成有关,在南美洲亚热带研究很少。在南美洲亚热带,含羞草属高度多样化,占多倍体物种的 30%。含羞草中多倍体的起源、遗传和形态结构,以及它们与物种形成、形态变异和分布的相关性,直到最近才被研究。含羞草潜艇。Dolentes-Brevipedes 是该地区的一个分类复合体,表现出多倍性,特定和种下分类群被混淆。对其种群生物学的研究将有助于阐明含羞草的进化过程和解决分类冲突。我们对这个综合体进行了多学科研究,通过形态测量法和整个分布区域的 AFLP 指纹分析分析了 7 个种群和 87 个个体。五个种群包括几个分类群和中间个体。形态测量分析揭示了三个簇,主要通过叶形态和花序来区分。一个种群是四倍体,一个是四倍体/八倍体,其余的是八倍体。遗传分化高(PhiPT = 0.277),预期杂合度中等(He = 0.190;H = 0.271)。多变量分子分析揭示了高原和低地草原之间的遗传差异。结构遗传分析揭示了三个集群:两个混合的,在低地/高地草原中明显占优势;另一个,完全来自梅赛德斯。分子方差分析显示高地/低地草原和细胞类型之间存在显着差异。细胞型和种群在形态上有所不同。四倍体在形态上与同域八倍体相似,表现出相似的遗传结构和基因流;此外,四倍体参与了这些高等多倍体的起源。该综合体的系统学需要修订:子系列 Dolentes 和一些短足类物种可以被视为一个子系列。遗传簇和中间体的混合可以通过杂交和基因渗入来解释。边缘种群在形态学和遗传学方面与其他种群不同,因此表明在这个复合体的地理边缘有早期的物种形成。四倍体在形态上与同域八倍体相似,表现出相似的遗传结构和基因流;此外,四倍体参与了这些高等多倍体的起源。该综合体的系统学需要修订:子系列 Dolentes 和一些短足类物种可以被视为一个子系列。遗传簇和中间体的混合可以通过杂交和基因渗入来解释。边缘种群在形态学和遗传学方面与其他种群不同,因此表明在这个复合体的地理边缘有早期的物种形成。四倍体在形态上与同域八倍体相似,表现出相似的遗传结构和基因流;此外,四倍体参与了这些高等多倍体的起源。该综合体的系统学需要修订:子系列 Dolentes 和一些短足类物种可以被视为一个子系列。遗传簇和中间体的混合可以通过杂交和基因渗入来解释。边缘种群在形态学和遗传学方面与其他种群不同,因此表明在这个复合体的地理边缘有早期的物种形成。亚系列 Dolentes 和一些短足类物种可以被视为一个亚系列。遗传簇和中间体的混合可以通过杂交和基因渗入来解释。边缘种群在形态学和遗传学方面与其他种群不同,因此表明在这个复合体的地理边缘有早期的物种形成。亚系列 Dolentes 和一些短足类物种可以被视为一个亚系列。遗传簇和中间体的混合可以通过杂交和基因渗入来解释。边缘种群在形态学和遗传学方面与其他种群不同,因此表明在这个复合体的地理边缘有早期的物种形成。
更新日期:2019-12-23
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