木兰科两个杂交组合的细胞学研究
A Cytological Study on Two Hybridized Combinations of Magnoliaceae
查看参考文献10篇
文摘
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研究了木兰科中木兰属(Magnolia)和含笑属(Michelia)问两个杂交组合后代的染色体。杂交组合紫玉兰(♀)×云南含笑(♂)后代的染色体数目为2n=3x=57,正好是四倍体紫玉兰(2n=4x=76)和二倍体云南含笑(2n=2x=38)的染色体半数之和,证明该F_1为两者的杂交种;杂交组合球花含笑(♀)×广玉兰(♂)后代的染色体数目为2n=2x=38,与二倍体球花含笑(2n=2x=38)相同,而不是球花含笑和广玉兰(2n=6x=114)的染色体半数之和,证明该F_1代不是真正的杂交种,可能是无融合生殖的结果。本研究结果支持含笑属与木兰属玉兰亚属具有较近亲缘关系的观点。 |
其他语种文摘
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The chromosome number and size of two intergeneric hybridized combinations between Magnolia and Michelia in Magnoliaceae were studied in this paper. Magnolia liliflora is a tetraploid species with a chromo?some number of 2n = 4x = 76, Michelia yunnanensis is diploid species with a chromosome number of 2n = 2x = 38. The intergeneric hybridized combination, Magnolia liliflora (♀) x Michelia yunnanensis (♂ ) , is triploid with a chromosome number of 2n = 3x = 57, which was a half of the total chromosome number of its two parents. Of which, 38 chromosomes from M. liliflora are smaller, and 19 chromosomes from M. yunnanensis are larger. So, the hybrid was confirmed to be crossbreeding filial generation of M. liliflora and M. yunnanensis . Michelia sphaerantha is a diploid species with a chromosome number of 2n = 2x = 38. Magnolia grandiflora is a hexaploid species with a chromosome number of 2n = 6x = 114. The intergeneric hybridized combination, M. sphaerantha (♀ ) × M. grandiflora (♂ ) , is a diploid with a chromosome number of 2n = 2x = 38, which is the same to that of its female parent, M. sphaerantha, in number and size. So, the hybridized combination is not a real hybrid, and the filial generation may be resulted from apomixes. The study showed that cytological method is one of efficient measures applied to early identification in crossbreeding of Magnoliaceae. The cross - compatibility indicated that Michelia is closely allied with Magnolia subgenus Yulania and is far allied with Magnolia subgenus Magnolia in phylogeny. |
来源
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园艺学报
,2003,30(5):615-617 【核心库】
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关键词
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木兰属
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含笑属
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杂交组合
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染色体
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地址
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中国科学院昆明植物研究所, 昆明, 650204
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语种
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中文 |
文献类型
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研究性论文 |
ISSN
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0513-353X |
学科
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园艺 |
基金
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云南省自然科学基金
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云南省中青年学术和技术带头人后备人才培养基金
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文献收藏号
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CSCD:1314335
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