香榧性别的早期鉴定

EARLY IDENTIFICATION OF CHINESE TORREYA SEXUALITY

1987～1989年间,作者对香榧核型进行了研究,据取自浙江诸暨、富阳两地的香榧茎(根)尖材料的核型分析结果,建立了香榧雌雄株该型模式,分别为: 雌:K(2n)=22=21X_m(2SAT)+1Y_m 雄:K(2n)=22=22X_m(2SAT) 根据上述模式对诸暨、富阳两地的131株香榧实生苗作了性别测定,结果有89株为雌性,42株为雄性。

(1) Establishment of sex idiogramRoot-tips and stem-tips of Chinese torreya for this study were collected from 63 female and 67 male trees growing in Longyang, Fuyang county and Zhuji county (Zhejiang, China) from 1987 to 1989. Chromosome numbers of the females and the males are found to be 22. Triploid (2n = 33) is only observed in root-tips of two plants. Karyotypes of both sexes are as follows:female: K(2n) = 22 = 21 Xm(2SAT) + 1Ymmale: K(2n) = 22 = 22 Xm(2SAT)Photomicrographs and idiograms are shown in Figs. A1-A3, B1-B3, C.(2) Identification of seedlings' sexualityRoot-tips of 131 seedlings from Longyang, Fuyang and Zhuji are under study. The results of karyotype analysis of 131 seedlings have been obtained. In the 131 seedlings, 89 are identified to be female and 42 male on the basis of above mentioned sex idiogram (See Table 3, 4).Results obtained through chromosome examination of the seedlings, as shown by Figs D-F, reveal that: (a) two seedlings from Longyang possess B-chromosomes. (b) four from Zhuji are found to be triploids. (c) three from Zhuji are aneuploids, two with 2n = 23; one with 2n=34.