文献类型：期刊文献

英文题名：Molecular markers reveal low genetic diversity in Casuarina equisetifolia clonal plantations in South China

作者：Yu, Wei[1] Zhang, Yong[1] Xu, Xiuyu[2] Zhong, Chonglu[1] Wei, Yongcheng[1] Meng, Jingxiang[1] Chen, Yu[1] Li, Zhen[1] Bush, David[3]

第一作者：Yu, Wei

通信作者：Zhang, Y[1];Zhong, CL[1];Bush, D[2]|[a00051856db9904c755bf]张勇;

机构：[1]Chinese Acad Forestry, Res Inst Trop Forestry, Guangzhou 510520, Peoples R China;[2]Guangdong Acad Forestry, Guangzhou 510520, Peoples R China;[3]CSIRO Australian Tree Seed Ctr, GPO Box 1600, Canberra, ACT 2601, Australia

年份：2020

卷号：51

期号：4

起止页码：689-703

外文期刊名：NEW FORESTS

收录：;EI(收录号：20194507632988);Scopus(收录号：2-s2.0-85074414807);WOS:【SCI-EXPANDED(收录号:WOS:000542947900001)】；

基金：This study was financially supported by the National Natural Science Foundation of China (Grant No. 31470634, 31770716), the Fundamental Research Funds for the Central Non-profit Research Institution of CAF (No. CAFYBB2018GC004), Specific Program for National Non-profit Scientific Institutions (CAFYBB2018ZB003), and Science and Technology Innovation Projects of Guangdong Forestry Department (2014KJCX017). We are grateful to the anonymous reviewers who kindly provided very useful suggestions and comments on the manuscript.

语种：英文

外文关键词：Casuarina equisetifolia; Microsatellite; Coastal shelterbelt; Genetic relatedness

摘要：Casuarina equisetifolia is planted extensively in clonally-established coastal shelterbelts in South China. During the last decade, the plantations have been severely attacked by Ralstonia solanacearum bacterial wilt, causing widespread decline and mortality. It has been thought that lack of genetic diversity, both within individual sites and at a regional scale, may render the plantations particularly susceptible to attack. Analysis of samples from 109 separate plantations in three provinces, Hainan, Guangdong and Fujian, using microsatellite molecular markers, revealed that only 22 separate clones are in use. Analysis of co-ancestry among the clones further revealed that many are closely related, consistent with selection of new clones from the sexually-reproduced offspring of existing ones, or selection of multiple clones from individual seedling families. Comparison with wild materials from throughout the species' natural range indicated that the origins of the South China clones are most likely from within the Southeast Asian region. We recommend diversifying the genetic base of planting material in South China and planting a more-diverse mix of unrelated clones at local and regional scales.