Karyotypes of nineteen species of Asteraceae in the Hengduan Mountains and adjacent regions  

作　　者：Wenguang Sun Xiangguang Ma Jianwen Zhang Fuming Su Yonghong Zhang Zhimin Li 

机构地区：[1]School of Life Science, Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Yunnan Normal University, Yunnan, Kunming 650500, China [2]Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201, China [3]University of Chinese Academy of Sciences, Beijing, 100049, China

出　　处：《Plant Diversity》2017年第4期194-201,共8页植物多样性（英文版）

基　　金：supported by the National Natural Science Foundation of China (31670206, 31360049) to Zhi-Min Li;major Program of NSFC (grant 31590823, 31590820) to Hang Sun,NSFC (31370004, 31570213) to Jian-Wen Zhang

摘　　要：The Hengduan Mountains region is a biodiversity hotspot. In this study, we report the karyotypes of 19 species(21 populations) of Asteraceae from this region, 14 of which are reported for the first time. We also examined polyploidy in Asteraceae plants and summarized karyotype data in the literature for 69 congeneric taxa. In these genera, there were five different ploidy levels in the region, though the most dominant was diploid(73.08%). There is no direct evidence that ploidy level and karyotype asymmetry are associated with the distribution of recorded Asteraceae species from the Hengduan Mountains. This suggests that polyploidy(26.92%) may not play an important role in the evolutionary history of these plants, even though, among these genera, the ratio of paleopolyploidy was high(46.15%).The Hengduan Mountains region is a biodiversity hotspot. In this study, we report the karyotypes of 19 species （21 populations） of Asteraceae from this region, 14 of which are reported for the first time. We also examined polyploidy in Asteraceae plants and summarized karyotype data in the literature for 69 congeneric taxa. In these genera, there were five different ploidy levels in the region, though the most dominant was diploid （73.08%）. There is no direct evidence that ploidy level and karyotype asymmetry are associated with the distribution of recorded Asteraceae species from the Hengduan Mountains. This suggests that polyploidy （26.92%） may not play an important role in the evolutionary history of these plants, even though, among these genera, the ratio of paleopolyploidy was high （46.15%）.

关 键 词：POLYPLOIDY Karyotype morphology Asteraceae Chromosome number Hengduan Mountains 

分 类 号：Q943[生物学—植物学]