南京林业大学学报（自然科学版）2017，Vol.41Issue(6)：33-40,8.DOI:10.3969/j.issn.1000-2006.201708012
'紫王子'海棠半同胞家系苗期表型特征分析
Analysis of phenotypic characteristics of the Malus 'Purple Prince' half-sib progenies at the seedling stage
摘要
Abstract
[Objective] In this project, experiment was conducted on the free pollination progeny of Malus ' Purple Prince' based on the advantages of the abundant resources in a crabapple germplasm bank. The goal of this study was to explore the phenotypic characteristics and breeding effectiveness of half-sib progenies.[Method]The phenotypic diversity of 14 traits was compared using the value of Shannon-Wiener (H′R ) and Pielou indexes (ER ). The trends in variation and transgressive characteristics of traits between parents and progeny were analyzed using a frequency distribution func-tion. Subsequently, the comprehensive evaluation of phenotypic traits was conducted by the analytic hierarchy process (AHP). [Result]In terms of phenotypic diversity, the average H′R of the 14 traits of the half-sib progenies increased by 13% compared to that of the possible paternal parent group. Among them, the H′R and ER of the ground diameter growth, branch number, heat resistance and mature leaf color increased by 23.8%-53.2%. Regarding genetic improvement, the proportion of excellent seedlings with high comprehensive scores in the half-sib progenies decreased by 37. 0% compared with the possible paternal parent group. The proportion of seedlings with purple-red colored leaves or a fast-growing charac-ter decreased by 14.9% and 37.5%, respectively. However, the proportion of seedlings with maple leaves, many branches, high seedling straightness, or high heat resistance increased by 12. 6%, 48. 3%, 28. 7% and 18. 5%, respectively. Compared with the maternal parent clones, the proportion of seedlings with high comprehensive scores increased by 7. 8%(12 seedlings). In addition, although the comprehensive score of some individual was slightly lower than that of the mater-nal parent clones, some single traits performed notably well. For example, the young leaves of F113 and F60 excellent seedlings were rarely bright red, the leaf type of F35 and F108 excellent seedlings as maple.[Conclusions]Although free pollination reduced the proportion of excellent seedlings with high comprehensive scores, it effectively expanded the genetic basis of half-sib progenies. Furthermore, it had obvious effect on the genetic improvement of some single traits.关键词
'紫王子'海棠/半同胞家系/表型多样性/超亲性/优株评价Key words
Malus 'Purple Prince'/half-sib progenies/phenotypic diversity/transgressive characteristics/comprehen-sive evaluation分类
农业科技引用本文复制引用
张往祥,范俊俊,杨萍,周婷,浦静,曹福亮..'紫王子'海棠半同胞家系苗期表型特征分析[J].南京林业大学学报（自然科学版）,2017,41(6):33-40,8.基金项目
江苏省科技厅重点研发计划(BE2016388) （BE2016388）
江苏省农业科技自主创新资金项目(CX(16)1005-4-1) （CX(16）
