Male and Female Subpopulations of Salix viminalis Present High Genetic Diversity and Low Recent Migration Rates between Them

作   者：Feifei Zhai1? Jinmei Mao1,2? Junxiang Liu1, Xiangyong Peng1, Lei Han1, Zhenyuan Sun1*
期刊名称：Frontiers in Plant Science
影响因子：4.298
卷 期 号：
页     码：
关键词：dioecy, Salix viminalis, genetic diversity, genetic differentiation, migration rate
论文摘要：
Dioecy distributed in 157 flowering plant families and 959 flowering plant genera.
Morphological and physiological differences between male and female plants have been
studied extensively, but studies of sex-specific genetic diversity are relatively scarce in
dioecious plants. In this study, 20 SSR loci were employed to examine the genetic
variance of male subpopulations and female subpopulations in Salix viminalis. The results
showed that all of the markers were polymorphic (Na = 14.15, He = 0.7566) and
workable to reveal the genetic diversity of S. viminalis. No statistically significant difference
was detected between male and female subpopulations, but the average genetic
diversity of male subpopulations (Na = 7.12, He = 0.7071) and female subpopulations
(Na = 7.31, He = 0.7226) were high. Under unfavorable environments (West Liao basin),
the genetic diversity between male and female subpopulations was still not significantly
different, but the genetic diversity of sexual subpopulations were lower. The differentiation
of the ten subpopulations in S. viminalis was moderate (FST = 0.0858), which was
conformed by AMOVA that most of genetic variance (94%) existed within subpopulations.
Pairwise FST indicated no differentiation between sexual subpopulations, which was
accompanied by high long-term migrate between them (M = 0.73～1.26). However, little
recent migration was found between sexual subpopulations. Therefore, artificial crossing
or/and transplantation by cutting propagation should be carried out so as to increase the
migration during the process of ex situ conservation.