Low genetic diversity and weak population differentiation in Firmiana danxiaensis, a tree species endemic to Danxia landform in northern Guangdong, China
Low genetic diversity and weak population differentiation in Firmiana danxiaensis, a tree species endemic to Danxia landform in northern Guangdong, China
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粤北丹霞地貌特有树种丹霞梧桐遗传多样性低、种群分化弱
DOI：
10.1016/j.bse.2014.02.029
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发表时间：
2014-08-01
影响因子：
1.6
通讯作者：
Fan, Qiang
中科院分区：
文献类型：
--
作者：
Chen, Sufang;Li, Mingwan;Fan, Qiang
丹霞地貌是我国南方零星分布的一种独特的岩石地貌类型。在这一地貌中，大约有400种稀有或受威胁的植物和动物，但关于这些物种的遗传方面的信息很少。丹霞梧桐是广东北方丹霞地貌的特有优势树种。本研究以非丹霞地貌区分布的两个梧桐属植物海南梧桐（Firmiana hainanensis）和广西梧桐（Firmiana kwangsiensis）为对照，对丹霞梧桐的遗传多样性和种群结构进行了研究。利用9个微卫星标记对丹霞鹅掌楸、海南鹅掌楸和广西鹅掌楸3个居群共256个个体的遗传多样性和分化进行了研究。结果表明，丹霞梧桐的遗传多样性最低（H-E = 0.364 +/- 0.019），但群体结构较弱（F-ST = 0.042和0.020），与其它梧桐属植物相似。丹霞特有种的遗传多样性较低，可能是由于丹霞地貌自然分布范围有限，土壤选择压力大，其他特有种的遗传多样性也较低。为了使这些特有种长期生存，栖息地保护和人类引入到类似的栖息地，如邻近的丹霞地貌区，应该是两个主要的策略。(C)2014爱思唯尔有限公司版权所有。
Danxia landform, a unique type of petrographic geomorphology, sporadically occurs in southern China. There are about 400 rare or threatened plants and animals in this landform, but little information on genetic aspects of these species has been available. Of them, Firmiana danxiaensis is a dominant tree species endemic to Mount Danxia, a typical Danxia landform in northern Guangdong, China. In this study, we examined genetic diversity and population structure of E danxiaensis, in comparison with two other narrowly distributed Firmiana species, Firmiana hainanensis and Firmiana kwangsiensis, which grow in non-Danxia-landform regions. Nine microsatellite markers were used to investigate genetic diversity and differentiation in a total of 256 individuals from nine populations of E danxiaensis, three of E hainanensis, and one of E kwangsiensis. The results showed that E danxiaensis had the lowest genetic diversity (H-E = 0.364 +/- 0.019) among the three species, but weak population structure similar to another Firmiana species (F-ST = 0.042 and 0.020, respectively). This low genetic diversity observed in E danxiaensis is possibly due to confined natural distribution range and strong selective pressure in soils of Danxia landform, which may also be true for other endemic species in Danxia landform. For the long term survival of these endemic species, habitat conservation and anthropogenic introduction to similar habitats such as the adjacent Danxia landform areas should be two major strategies. (C) 2014 Elsevier Ltd. All rights reserved.