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首页> 外文期刊>Genetic Resources and Crop Evolution >Phenotypic diversity and delimitation between wild and cultivated forms of the genus Pyrus in North-eastern Spain based on morphometric analyses
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Phenotypic diversity and delimitation between wild and cultivated forms of the genus Pyrus in North-eastern Spain based on morphometric analyses

机译：基于形态计量学的西班牙东北部梨属野生和栽培形式的表型多样性和定界

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摘要

We investigated morphological evidence that might allow wild Pyrus spp. to be distinguished from cultivated material (Pyrus communis L.) in the North-eastern Iberian Peninsula. 134 pear trees were identified in the wild and characterized by 13 quantitative and 13 qualitative leaf–shoot and fruit traits. The trees were visually classified into two preliminary groups of wild and cultivated material and discriminant functions, based on a reference collection for allocating individuals to one of the groups, were constructed. Both classifications were compared with a near-optimal numerical classification (the two-stage Ward-MLM strategy) using two criteria. The visual assignment of trees allocated 60% of trees to the wild group and 40% to the cultivated group. The overall discrepancy rate between the field classification and the discriminant analysis was low (17.4%). In general, wild individuals had smaller leaves, shorter petioles and more rounded and smaller fruits than their cultivated counterparts. They also had small-to-intermediate petiole widths, thorns on their shoots and straight or convex fruit profiles. However, the Ward-MLM strategy always formed better groups, in terms of the two criteria used, in all the continuous and categorical variables, for both leaf–shoot and fruit traits. Likewise, the agreement between classifications (discriminant analysis and Ward-MLM strategy) was only partial, with some Ward-MLM groups composed of both wild and cultivated material in similar proportions. This result suggests a limited success in identifying genuine wild individuals based on morphometric data, which can be ascribed either to poor phenotypic diversity and lack of distinguishing traits among species or to widespread crossability and subsequent development of hybrid/introgressant populations between wild and cultivated specimens.
机译：我们调查了可能允许野生梨属植物的形态学证据。不同于伊比利亚东北半岛的栽培材料（Pyrus communis L.）。在野生环境中鉴定出134棵梨树，并具有13个定量和13个定性的叶梢和果实性状。根据用于将个体分配到其中一个组的参考集合，将树木视觉上分为野生和栽培材料的两个初步组和判别功能。使用两个标准，将这两种分类与接近最佳的数值分类（两阶段Ward-MLM策略）进行比较。树木的视觉分配将60％的树木分配给野生群体，将40％的树木分配给耕种群体。现场分类和判别分析之间的总体差异率很低（17.4％）。一般而言，野生个体的叶子比耕种的个体更小，叶柄更短，果实更圆且更小。他们的叶柄宽度也中等到中等，芽上有刺，果形笔直或凸出。然而，就叶枝和果实性状而言，在所有连续和分类变量中，就所使用的两个标准而言，Ward-MLM策略总是形成更好的分组。同样，分类之间的一致性（判别分析和Ward-MLM策略）只是部分的，一些Ward-MLM组由野生和栽培材料组成，比例相似。该结果表明基于形态计量学数据鉴定真正的野生个体的成功有限，这可以归因于表型多样性差和物种间缺乏明显的性状，或者归因于广泛的可交叉性以及野生和栽培标本之间杂种/渐渗种群的发展。

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