文献类型： 外文期刊

第一作者： Cao, YF

作者： Cao, YF;Huang, LS;Li, SL;Yang, YL

作者机构：

期刊名称：PROCEEDINGS OF THE INTERNATIONAL SYMPOSIUM ON ASIAN PEARS COMMEMORATING THE 100TH ANNIVERSARY OF NIJISSEIKI PEAR, VOLS I AND II

ISSN： 0567-7572

年卷期： 2002 年 587 期

页码：

收录情况： SCI

摘要： Two tetraploid (2n=4x=68) Pyrus cultivars 'Dayali' and 'Sha 01% three triploid (2n=3x=51) pear cultivars 'Anli', 'Dashuihe' and 'Baipiyang'; and seven diploid (2n=2x=34) pear cultivars 'Qinsu', 'Jinhua 4', 'Dananguo', 'Kuerlexiang', 'Qiubai', 'Pingguoli' and 'Bartlett' were chosen as seed or pollen parents to study the genetics of pear ploidy. Eight hybridized combination types were designed and 25 crossings were performed. The chromosome numbers of 725 hybrid seedlings were observed. It was found that 516 seedlings were diploid, and the ratio of diploid was 71.2%; 91 seedlings were triploid, and the ratio of triploid was 12.6%; 74 seedlings were tetraploid, and the ratio of tetraploid was 10.2%; 44 seedlings were aneuploid, and the ratio of aneuploid was 6.0%. We analyzed the efficiency of every hybridized combination type for polyploid pear breeding and found: 1) 4xx4x is the best combination type for tetraploid breeding; 2) 4xx3x, 3xx4x are efficient combination types for polyploid breeding, especially for triploid breeding; 3) 4xx2x is the ideal combination type for triploid breeding; 4) Zxx4x, 3xx3x, 2xx3x, 3xx2x are not good combination types for polyploid breeding.

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