Chloroplast DNA variation and population structure in the widespread forest tree, Eucalyptus grandis
Chloroplast DNA variation and population structure in the widespread forest tree, Eucalyptus grandis
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DOI：
10.1007/s10592-005-9104-7
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发表时间：
2006-06
影响因子：
2.2
通讯作者：
M. Jones;M. Shepherd;R. Henry;A. Delves
中科院分区：
文献类型：
--
作者：
M. Jones;M. Shepherd;R. Henry;A. Delves
识别种群的遗传结构和识别脆弱种群的能力对植物保护管理策略的形成是有用的。大桉树是一种高大的森林树木，主要分布在澳大利亚东部的亚热带地区，在东海岸热带地区有较小的种群。许多广泛分布的森林物种表现出与地理区域相对应的种群分化。然而，基于同工酶和形态数据，桉树是一个例外。考虑到北部种群与物种范围南部种群之间存在很大的不连续性，这一点很有趣。在这项研究中，由于叶绿体基因组的进化较慢，种子在桉树中的传播有限，因此研究了母系遗传叶绿体位点的分布，因为它更有可能揭示遗传结构。正如预期的那样，叶绿体DNA的gst高于核DNA，但表明森林树种的群体分化程度较低。系统地理学分析表明，15个居群可分为3大地理区域；但总体种群结构较弱，表明其分布存在较大的地理脱节。gran惊愕是最近才出现的。生态环境保护管理的范例。基于叶绿体DNA单倍型分布的大分类可以考虑到群体间分化程度较低。
Recognition of genetic structure of populations and the ability to identify vulnerable populations is useful for the formation of conservation management strategies for plants.Eucalyptus grandisis a tall forest tree that has a major area of occurrence in subtropical eastern Australia, with smaller populations located in the east coast tropics. Many widespread forest species exhibit population differentiation that corresponds to geographic regions. However,Eucalyptus grandisappears to be an exception based on isozyme and morphological data. This is intriguing given a large discontinuity between northern populations and those in the southern part of the species range. In this study, the distribution of a maternally inherited chloroplast locus was examined because it was more likely to reveal genetic structure due to the slower evolution of the chloroplast genome and limited dispersal of seed in eucalypts. As expected, theGSTfor chloroplast DNA was higher than that for nuclear DNA but indicated low population differentiation for a forest tree species. Phylogeographic analysis indicated that the 15 populations grouped into three broad geographical regions; however, overall population structure was weak suggesting that the large geographical disjunction in the distribution ofE. grandismay be relatively recent. A paradigm for conservation management ofE. grandisbased on chloroplast DNA haplotype distribution would take into account the low differentiation among populations.