Gong, Xun
(Kunming Institute of Botany,Chinese Academy of Sciences)
,
Zhang, Guoli
(Kunming Institute of Botany,Chinese Academy of Sciences)
,
Pan, Yuezhi
(Kunming Institute of Botany,Chinese Academy of Sciences)
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 ...
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.
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.
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