EARLY IDENTIFICATION OF CHINESE TORREYA SEXUALITY

(1) Establishment of sexidiogram Root-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' sexuality Root-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.