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Chromosome number evolution in dalbergioid legumes (Papilionoideae, Leguminosae)
Brazilian Journal of Botany ( IF 1.6 ) Pub Date : 2020-07-18 , DOI: 10.1007/s40415-020-00631-6
Ana Paula Moraes , Mohammad Vatanparast , Caroline Polido , André Marques , Gustavo Souza , Ana Paula Fortuna-Perez , Eliana R. Forni-Martins

The dalbergioids, one of the largest clades among legumes, present significant karyotype diversity. Previous studies suggested different base chromosome numbers, hampering the understanding of karyotype evolution in dalbergioid legumes. In this study, we integrated chromosome numbers from the literature with phylogenetic data and new cytogenetic data for six species aiming to clarify the paths of karyotype evolution. We could confirm the base chromosome number of dalbergioid legumes as x = 10, which was constant for the three dalbergioid clades, namely Adesmia, Dalbergia, and Pterocarpus. However, we found alternative base chromosome numbers for some genera, which illustrate the two main mechanisms of chromosome changes found in dalbergioids: polyploidy and dysploidy. Considering the first diverging lineages in the phylogeny, polyploidy and dysploidy could be detected in seven and three nodes, respectively, with two out of the three dysploidy events associated with polyploidy. Nevertheless, considering the chromosome changes within species, the descendent dysploidy was the most common event in dalbergioid legumes. Such a high frequency of dysploidy highlights the importance of studying multiple populations from each species. In addition, the chromosome banding revealed DAPI+ bands, which is not commonly found in plants, as a possible chromosome marker for Stylosanthes. The chromosome banding analysis has taxonomic potential and could be explored in future studies to better understand the complex taxonomic groups inside dalbergioid legumes.

中文翻译:

dalbergioid 豆科植物(凤蝶科,豆科)的染色体数目演变

dalbergioids 是豆科植物中最大的进化枝之一,具有显着的核型多样性。以前的研究表明不同的碱基染色体数量,阻碍了对黄檀类豆科植物核型进化的理解。在这项研究中,我们将文献中的染色体数与六种物种的系统发育数据和新的细胞遗传数据相结合,旨在阐明核型进化的路径。我们可以确认 dalbergioid 豆科植物的基础染色体数为 x = 10,这对于三个 dalbergioid 进化枝,即 Adesmia、Dalbergia 和 Pterocarpus 是恒定的。然而,我们发现了一些属的替代碱基染色体数,这说明了在黄檀中发现的染色体变化的两种主要机制:多倍体和异倍体。考虑到系统发育中第一个不同的谱系,可以分别在七个和三个节点中检测到多倍体和异常倍体,三个异常事件中有两个与多倍体相关。然而,考虑到物种内的染色体变化,后代异倍体是黄檀类豆科植物中最常见的事件。如此高频率的异倍体凸显了研究每个物种的多个种群的重要性。此外,染色体条带揭示了 DAPI+ 条带,这在植物中并不常见,它可能是柱花草的染色体标记。染色体条带分析具有分类学潜力,可以在未来的研究中进行探索,以更好地了解黄檀类豆科植物中复杂的分类群。然而,考虑到物种内的染色体变化,后代异倍体是黄檀类豆科植物中最常见的事件。如此高频率的异倍体凸显了研究每个物种的多个种群的重要性。此外,染色体条带揭示了 DAPI+ 条带,这在植物中并不常见,它可能是柱花草的染色体标记。染色体条带分析具有分类学潜力,可以在未来的研究中进行探索,以更好地了解黄檀类豆科植物中复杂的分类群。然而,考虑到物种内的染色体变化,后代异倍体是黄檀类豆科植物中最常见的事件。如此高频率的异倍体凸显了研究每个物种的多个种群的重要性。此外,染色体条带揭示了 DAPI+ 条带,这在植物中并不常见,它可能是柱花草的染色体标记。染色体条带分析具有分类学潜力,可以在未来的研究中进行探索,以更好地了解黄檀类豆科植物中复杂的分类群。染色体条带揭示了 DAPI+ 条带,这在植物中并不常见,它可能是柱花草的染色体标记。染色体条带分析具有分类学潜力,可以在未来的研究中进行探索,以更好地了解黄檀类豆科植物中复杂的分类群。染色体条带揭示了 DAPI+ 条带,这在植物中并不常见,它可能是柱花草的染色体标记。染色体条带分析具有分类学潜力,可以在未来的研究中进行探索,以更好地了解黄檀类豆科植物中复杂的分类群。
更新日期:2020-07-18
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