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›› 1993, Vol. 29 ›› Issue (5): 389-392.

• 论文及研究报告 •    下一篇

香榧的核型和性别的早期鉴别

管启良 袁妙葆 俞仲辂   

  1. 杭州大学生物系,杭州310012;杭州植物园,杭州310013
  • 收稿日期:1991-12-16 修回日期:1900-01-01 出版日期:1993-09-25 发布日期:1993-09-25

EARLY DISCRIMINATION OF KARYOTYPE AND SEXUALITY FOR CHINESE TORREYA

Guan Qiliang,Yuan Miaobao,Yu Zhonglu   

  1. Department of Biology, Hangzhou University, Hangzhou 310012;Hangzhou Botanical Garden,Hangzhou 310013
  • Received:1991-12-16 Revised:1900-01-01 Online:1993-09-25 Published:1993-09-25

摘要: 香榧(Torreya grandis Fort.cv.Merrillii)是我国特有的经济树种,雌雄异株。根尖细胞染色体分析表明:雌株有一对异形性染色体,异配性别,属ZW型;雄株是同配性别,属ZZ型。雌株的核型为2n=2x=22=22m(2SAT+ZW),雄株的核型为2n=2x=22=22m(2SAT+ZZ)。雌株的体细胞中只有一条最短的Z染色体,间期核的两个染色中心的差异明显。雄株有一对最短的Z染色体,间期核的两个染色中心的大小相同。根据这些特征,植株的性别可早期鉴别。

关键词: 榧, 核型, 性别鉴别

Abstract: Chinese torreya (Torreya grandis Fort. cv.'Merrillii') is an endemiceconomic tree species in our country, which is dioecious. The chromosomalanalyses of the cells in root tip, show that the female plant has a pair ofheteromorphic sex chromosomes, which are heterogametic sex and belong toZW type. The male plant is homogametic sex and belong to ZZ type. Thekaryotype of the female plant is 2n=2x=22=22m (2SAT+ZW), while thatof the male plant 2n=2x=22=22m(2SAT+ZZ) In the somatic cell of the female plant there is only one shortestz chromosome, and the difference of the sizes between the two chromocentres of interphase nuclei is notable. The male plant has a pair of shortest Z chromosomesand the sizes of the chromocentres of interphase nuclei are the same. According to these characters the sexuality of the plant can be discriminated atearly stage,

Key words: Chinese torreya, Karyotype, Sex-discrimination