作 者 ：Liang Guo-Lu
期 刊 ：植物分类学报 1987年 6期
Keywords:Chromosome number, Polyploid,
Abstract:
Somatic chromosome numbers of 37 forms (representing 22 species) of apples
in China were counted using wall-degradation and hypotonic method. Among the species in-
vestigated 3 categories of chromosome numbers, i.e. 2n=34, 51 and 68 are confirmed. The
chromosome numbers of the following species are here first reported: Malus ombrophila 2n=
34, M. prattii 2n=34, M. melliana 2n=34, Zhaojiaohonghua (M. sp.) 2n=34, and M. asiatica
var. 2n=68. Polyploids (including infraspecific polyploids) account for 41% of the total num-
ber of the species investigated. 51 is a predominant number. It is suggested that ploidy varia-
tion is an important pathway in apple evolution in China, and triploid may be considered as
a suitable evolution grade. There are rich apple germplasm resources in China. The systema-
tic studies of this genus are obviously essential.