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期 刊 ：植物遗传资源学报 2014年 15卷 6期

关键词：梨；叶片；色泽指标；分类；

Keywords:Pyrus, leaf, color index, classification,

摘 要 ：为了探索梨属植物新的分类参考指标，本研究以我国主要梨属植物种（Pyrus species）以及近缘属植物榅桲（Cydonia oblonga）为试材，对叶片叶绿素含量，色差值L、a、b等色泽指标进行了测定，并计算出色度角（H）、色泽比（h）、色彩饱和度（C）等综合色度指标参数，采用聚类分析及主成分分析方法对叶片色泽指标参数进行了统计分析。结果显示：在果树作物中，梨属植物秋季叶片色泽丰富，与近缘属植物叶色差异明显，依据叶色指标参数能够将梨属植物划分为不同类别，叶色聚类划分结果与自然分类结果基本吻合，亲缘关系近的种群聚合在一起；另外，对梨的种间杂种和一些难以分类的种类能够得到合理的解释。以上指出，梨属植物叶片色泽能够做为一项重要的分类参考指标，研究的开展为今后梨属植物优异种质资源开发利用和分类研究提供参考依据。

Abstract:In order to explore the new classification reference index for the Chinese pear. In the experiment, the important genotypes of the genus Pyrus and its allied genera (Cydonia oblongs) used as materials. The leaf chlorophyll content, the color value L、a、b were determined using a colorimeter and a chlorometer. The colour parameters H、h and C were calculated. The correlation and clustering analysis were carried out based on these data. The results showed that there was significant difference in leaf color parameters between genus Pyrus and its allied genera, the genus Pyrus were divided into different categories on the basis of leaf color parameters, the clustering analysis results were basically consistent with the natural classification. The close population of genetic relationship was divided into together. In addition, interspecific hybrid and the types of classification difficulty were able to get a reasonable explanation. The results showed that the leaf color parameters in the genus Pyrus may be a suitable index to assess the classification of the genus Pyrus. The investigation could provide a reference for the future taxonomy of the genus Pyrus and the development and utilization of germplasm resources.

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