KARYOTYPE ANALYSIS OF CAMELLIA KISSII WALL.
Huang Shao-fu (Institute of Forestry in the Subtropics of China, Chinese Academy of Forest Science)Hsu Ping-sheng (Department of Biology, Futan University)
Camellia kissii Wall., an economic tree nowadays used as an oil-bearing crop, was investigated cytologically, and the number of somatic chromosomes in root tip cell was found to be 2n = 30 (Fig.1), in accord with those reported by Janaki Animal and Kondo. According to the chromosomal classification of Levan and al. , Kato and al the karyotype formula of the species are therefore K(2n) = 30 = 22m + 4sm + 4st. and K(2n)=30 = 22V + 8J respectively. But ploidy of 2n = 60(4x) and 75(5x) (Fig. 4) have occasionally been observed as is often the case with C. yuhsinensis Hu and C. japonica.Taxonomieally C. kissii (Sect. Psracamellia Sealy) as well as C. chekiango-leosa Hu and C. semiserrata Chi (Sect. Camellia) belong to Subgenus Camellia. It is interesting to note that the somatic compliments of all these species with two pairs of chromosomes possessing secondary constrictions. But species otherwise than Subgenus Camellia have not yet been found to have chromosomes with secondary constrictions. This suggests that the above species are phylogenetically closely related and appears on cytolgieal grounds to be well placed in the same subgenus.