作 者 ：WANG Ren-Xiang, LI Guang-Zhao, LANG Kai-Yong, WEI Yi-Gang
期 刊 ：植物分类学报 2001年 1期
关键词：
Keywords:Chromosome number, Karyotype, Evolution,
Abstract:
This paper reports the chromosome number and morphology of 8 species of the genus As-
pidistra from China. The chromosome number of six species is reported for the first time. The results
are as follows: 2n = 2x = 36 = 18m + 2sm(2sat) + 16st for A. ebianensis; 2n = 2x = 36 = 14m +
6sm(2sat) + 16st for A. yingjiangensis; 2n = 2x = 36 = 20m(2sat) + 14st + 2t for A. hainanensis;
2n=2x=36= 16m + 4sm(2sat) + 16st for A. saxicola; 2n ＝ 2x ＝ 36 ＝ 18m+ 2sm(2sat) + 16st
for A. muricata; 2n = 2x = 38 = 22m+4sm(2sat) + 12st for A. marginella; 2n = 4x = 76 = 48m
(4sat) +2sm+26st for A. xilinensis; 2n = 4x = 76 = 46m(4sat) + 12sm+ 18st for A. crucifor-
mis. All the karyotypes are bimodal and belong to Stebbins’2C type. A. cruciformis and A. xilin-
ensis are the only two tetraploid species found in Aspidistra up to date. Based on our results and
those previously reported,we consider that the karyotypes of the genus Aspidistra might have evolved
towards the increase of symmetry by the increase of median-centromeric chromosomes in the chromo-
some complement and the basic chromosome number x = 18 might be primitive, while x = 19 de-
rived.