中文摘要：

遵循国际植物新品种保护联盟及我国的相关规定,分析木瓜属植物品种的性状变异规律及其稳定性和相关性（DUS）,探讨标准品种和测试性状的选择。筛选31个测试性状和12个标准品种用于新品种DUS测试;其中,质量性状10个、数量性状6个、假质量性状15个,＂＊＂号性状24个、非＂＊＂号性状7个,每个性状的表达状态给以相应的代码。＂＊＂号性状主要有株型、花色、花径、重瓣性、果实形状及果皮皱缩状况等。提出木瓜属植物新品种的特异性、一致性、稳定性判别标准。

英文摘要：

The characteristics variation pattern, stability and their relevance of varieties in the genus Chaenomeles were analyzed based on UPOV and Chinas assessment system. The selection principles of example varieties and testing characteristics were discussed. Twelve example varieties and thirty-one testing characteristics （10 qualitative, 6 quantitative, and of pseudo-qualitative） were adopted for DUS test. For each characteristic a code was given to express the state. Twenty-four characteristics were of asterisked, such as plant type, flower color, flower diameter, polyphyll state, fruit shape, and peel crimpled state, and seven ones were of non-asterisked. The assessment standard for Distinctness, Uniformity, and Stability was put forward.