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首页> 外文期刊>Genetic Resources and Crop Evolution >Persea (avocados) phylogenetic analysis based on morphological characters: hypothesis of species relationships.
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Persea (avocados) phylogenetic analysis based on morphological characters: hypothesis of species relationships.

机译：基于形态特征的Persea（avocados）系统发育分析：物种关系假设。

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摘要

The genus Persea consists of two subgenera, Persea (known as avocados) and Eriodaphne (known as aguacatillos, avocado-like species). The present study aimed to determine whether the genus Persea is a monophyletic group and whether the division into two subgenera is an artificial one. In conjunction with these goals, a hypothesis of the phylogenetic relationships among Persea species is proposed. Our results suggest that Persea is not a monophyletic group. Two clades of Persea can be recognized. The results suggest that Eriodaphne and Persea should be considered to be independent genera. Various leaf and floral characters contributed for separation into groups. The definition of Eriodaphne is based on fruit colour, sessile glands at the base of the stamens, vein prominence and leaf shape. Persea is more closely related to genera Nectandra and Ocotea than Eriodaphne. The 11 species included in Persea are recognized as species. The group is defined by fruit flavour, mature leaf colour, number of tertiary divergent veins, and pubescent bracts in the inflorescence. Within this group, a clade of six species in which P. guatemalensis is included is recovered by seed shape, venation pattern relief, and number of fruits per cluster. Moreover, the seed shape supports the separation of P. floccosa and P. zentmyerii. A molecular character analysis is necessary to support the Persea clades proposed herein. Nevertheless the phylogenetic relationships revealed by this study provide new bases for the selection and conservation of the species Persea.
机译：Persea属包含两个亚属，Persea（称为鳄梨）和Eriodaphne（称为aguacatillos，类似于鳄梨的物种）。本研究旨在确定Persea属是否是单系属，并且分为两个亚属是否是人工的。结合这些目标，提出了Persea物种之间的系统发育关系的假设。我们的结果表明，Persea不是一个单一的群体。可以看到Persea的两个分支。结果表明，Eriodaphne和Persea应该被认为是独立的属。各种叶和花的性状有助于将其分成几类。 Eriodaphne的定义基于果实的颜色，雄蕊基部的无梗腺，静脉突出和叶片形状。与Eriodaphne相比，Persea与Nectandra和Ocotea属关系更密切。 Persea包括的11种树种被确认为树种。该组由果实风味，成熟的叶子颜色，三级发散静脉的数量和花序中的短柔毛来定义。在这一组中，通过种子形状，通气方式减轻和每簇果实数恢复了包括危地马拉疟原虫在内的六个物种的进化枝。此外，种子形状支持P. floccosa和P. zentmyerii的分离。分子特征分析对于支持本文提出的Persea进化枝是必需的。然而，这项研究揭示的系统发育关系为Persea物种的选择和保存提供了新的依据。

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