文献类型：期刊文献

英文题名：Gene Flow and Recruitment Patterns among Disjunct Populations of Allocasuarina verticillata (Lam.) L.A.S. Johnson

作者：Zhang, Yong[1,2] England, Nigel[2] Broadhurst, Linda[3] Li, Lan[3] Zhong, Chonglu[1] Bush, David[2]

第一作者：Zhang, Yong;张勇

机构：[1] Research Institute of Tropical Forestry, Chinese Academy of Forestry, Guangzhou, 510520, China; [2] CSIRO Australian Tree Seed Centre, GPO Box 1700, Canberra, ACT, 2601, Australia; [3] National Collections and Marine Infrastructure, CSIRO, Canberra, ACT, 2601, Australia

年份：2022

卷号：13

期号：7

外文期刊名：Forests

收录：EI(收录号：20223612694265);Scopus(收录号：2-s2.0-85137142850)

语种：英文

外文关键词：Biodiversity - Cell proliferation - DNA sequences - Plants (botany) - Population statistics

摘要：Allocasuarina verticillata (Lam.) L.A.S. Johnson is a widespread species in south-eastern Australia providing vegetation cover, protecting fragile soils and providing food for birds. Understanding the effects of gene flow on the recruitment patterns, genetic differentiation and structure of fragmented populations provides fundamental guidelines to underpin plant conservation strategies and activities. In this study, four spatially disjunct populations of A. verticillata were sampled to explore the effects of population size, reproductive patterns and pollen and seed dispersal on among-population genetic diversity, genetic differentiation and structure, using field survey and microsatellite marker techniques. It was found that stands of A. verticillata were predominantly sexually reproductive, but asexual reproduction through root suckering was an additional mode of reproduction. The reproductive success of A. verticillata is positively correlated with the effective population size rather than actual population size. The reduction in effective population size and increment of spatial isolation resulted in lower genetic diversity and higher inbreeding coefficient of progenies. Moderate pairwise genetic differentiation and weak genetic structure were identified. The results suggest that exogenous, wind-mediated pollen flow provides some maintenance of genetic diversity in the isolated stands. Seed dispersal appears mainly to be over short distances (i.e., within populations), but the infrequent transport of seeds between disjunct locations cannot be ruled out as another factor that may help maintain genetic diversity. ? 2022 by the authors.