Genotypic diversity and genetic structure of populations of the distylous aquatic plant Nymphoides peltata （Menyanthaceae） in China  

作　　者：Yi-Ying LIAO Xiao-Li YUE YOU-Hao GUO Wahiti Robert GITURU Qing-Feng WANG Jin-Ming CHEN 

机构地区：[1]Laboratory of Plant Systematics and Evolutionary Biology, College of Life Sciences, Wuhan University, Wuhan 430072, China [2]Botany Department, Jomo Kenyatta University of Agriculture and Technology, Nairobi, Kenya [3]Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China

出　　处：《Journal of Systematics and Evolution》2013年第5期536-544,共9页植物分类学报（英文版）

基　　金：Acknowledgements The authors thank Fan LIU, Xing-Yu YANG, Zhi-Yuan DU, and Chun-Feng YANG for their help in fieldwork, and Dan YANG and Shu-Ying ZHAO for their assistance in the laboratory. This study was supported by grants from the One Hundred Person Project of the Chinese Academy of Sciences to WQF （Grant No. KSCX2-YW- Z-0805） and from the National Natural Science Foundation of China （Grant Nos. 30970195 and 31270278）.

摘　　要：Nymphoidespeltata is a distylous aquatic plant. In order to explore the relative importance ofclonal growth and sexual reproduction within populations and also to reveal the origin of the commonly occurring one style morph populations in China, we studied the clonal diversity and population genetic structure of this species. By using seven single sequence repeat primer pairs, a total of 192 multilocus genotypes （MLGs） were identified among the 472 samples from the 21 populations analyzed; each population had two or more MLGs. The number of MLGs was lower for the one style morph populations than distylous populations. Analysis of molecular variance showed that a smaller proportion of genetic variation resided among populations （36.8%）. A neighbor-joining tree indicated that there was no significant geographical structure of the genetic variation among populations of N. peltata. The Bottleneck tests indicated that there had been significant bottlenecks in most of the studied populations. The successful sexual recruitment from seeds may have contributed to the high clonal diversity in distylous populations of N. peltata in China. Demographic stochasticity or bottleneck should account for the one style morph population with several MLGs. And also the bottleneck effects or demographic changes caused by human activities occurring randomly in populations should account for the finding of no significant geographical structure of the genetic variation among the investigated populations ofN. peltata.Nymphoidespeltata is a distylous aquatic plant. In order to explore the relative importance ofclonal growth and sexual reproduction within populations and also to reveal the origin of the commonly occurring one style morph populations in China, we studied the clonal diversity and population genetic structure of this species. By using seven single sequence repeat primer pairs, a total of 192 multilocus genotypes （MLGs） were identified among the 472 samples from the 21 populations analyzed; each population had two or more MLGs. The number of MLGs was lower for the one style morph populations than distylous populations. Analysis of molecular variance showed that a smaller proportion of genetic variation resided among populations （36.8%）. A neighbor-joining tree indicated that there was no significant geographical structure of the genetic variation among populations of N. peltata. The Bottleneck tests indicated that there had been significant bottlenecks in most of the studied populations. The successful sexual recruitment from seeds may have contributed to the high clonal diversity in distylous populations of N. peltata in China. Demographic stochasticity or bottleneck should account for the one style morph population with several MLGs. And also the bottleneck effects or demographic changes caused by human activities occurring randomly in populations should account for the finding of no significant geographical structure of the genetic variation among the investigated populations ofN. peltata.

关 键 词：aquatic plant BOTTLENECK clonal diversity HETEROSTYLY MICROSATELLITE morph bias Nymphoides peltata. 

分 类 号：Q987[生物学—遗传学] S828.2[生物学—人类学]