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Morphological diversity of Kenyan papaya germplasm

机译：肯尼亚木瓜种质的形态多样性

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摘要

Papaya is one of the major fruit crops of the tropical regions of the world. It shows considerable phenotypic variation in morphological and horticultural traits that can be utilized in its genetic improvement. In Kenya, wide range of papaya germplasm exists and has not been characterized. Therefore, there is difficulty in differentiating the papaya accessions in the different regions of Kenya. Characterization of papaya germplasm is normally accomplished by use of morphological descriptors, hence as a first step, a germplasm collection from within Kenya was gathered and its morphological diversity was assessed. The papaya germplasm was collected from Coast, Nyanza, Western, Rift Valley, Eastern and Central provinces of Kenya and characterized in the field using morphological descriptors based on fruit, flower, stem and leaf characteristics. The morphological characters were recorded and morphological data from sixty accessions were submitted to principal component and Neighbor-Joining cluster analysis. Accessions from Coastal, Western, Rift Valley and Nyanza provinces showed the widest morphological diversity with those from Eastern and Central provinces showing the least diversity. Fruit shape, fruit diameter, tree habit, leaf size and flower color showed the greatest variation in principal component analysis. The high diversity observed within the accessions points to ample possibilities of obtaining desirable trait combinations in specific cultivars.
机译：木瓜是世界热带地区的主要水果作物之一。它显示出可在其遗传改良中利用的形态和园艺性状的显着表型变异。在肯尼亚，木瓜种质种类繁多，尚未鉴定。因此，在肯尼亚不同地区很难区分木瓜种。番木瓜种质的鉴定通常通过形态学描述来完成，因此，第一步，从肯尼亚内部收集种质并对其形态多样性进行评估。木瓜种质采自肯尼亚的海岸，尼扬扎州，西部，裂谷，东部和中部省份，并在田间使用基于果实，花朵，茎和叶特征的形态学描述符进行了表征。记录形态特征，并将来自60个种质的形态数据提交给主成分和Neighbor-Joining聚类分析。沿海，西部，裂谷和Nyanza省的种质表现出最大的形态多样性，而东部和中部省份的种质表现出最少的多样性。主成分分析结果显示，果实形状，果实直径，树性，叶大小和花色变化最大。在种质中观察到的高度多样性表明在特定品种中获得所需性状组合的充足可能性。

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