塔里木盆地沙生柽柳(Tamarix taklamakanensis)遗传多样性

苏志豪; 卓立; 李文军; 刘会良; 康晓珊; 姜小龙

doi:10.7522/j.issn.1000-694X.2017.00067

中国沙漠 >

2018 , Vol. 38 >Issue 5: 1041 - 1048

DOI: https://doi.org/10.7522/j.issn.1000-694X.2017.00067

生物与土壤

塔里木盆地沙生柽柳(Tamarix taklamakanensis)遗传多样性

苏志豪 ,
卓立 ,
李文军 ,
刘会良 ,
康晓珊 ,
姜小龙

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1. 中国科学院新疆生态与地理研究所干旱区生物地理与生物资源重点实验室, 新疆乌鲁木齐 830011;
2. 新疆师范大学图书馆, 新疆乌鲁木齐 830011;
3. 中国科学院上海辰山植物科学研究中心/上海辰山植物园, 上海 201602

苏志豪(1981-),男,湖北随县人,副研究员,从事植物遗传保育研究工作。E-mail:suzh@ms.xjb.ac.cn

收稿日期: 2017-04-10

修回日期: 2017-07-11

网络出版日期: 2018-11-03

基金资助

国家自然科学基金项目（31770703，31400561，U1803101）；中国科学院"西部青-学者"项目（2016-QNXZ-B-16）

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Genetic Diversity of Tamarix taklamakanensis in the Tarim Basin

Su Zhihao ,
Zhuo Li ,
Li Wenjun ,
Liu Huiliang ,
Kang Xiaoshan ,
Jiang Xiaolong

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1. Key Laboratory of Biogeography and Bioresource in Arid Land, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
2. Library of Xinjiang Normal University, Urumqi 830011, China;
3. Shanghai Chenshan Plant Science Research Center/Shanghai Chenshan Botanical Garden, Chinese Academy of Sciences, Shanghai 201602, China

Received date: 2017-04-10

Revised date: 2017-07-11

Online published: 2018-11-03

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摘要

沙生柽柳（Tamarix taklamakanensis）为中国特有种，是流动沙丘上最抗旱耐热的固沙造林树种，对荒漠化防治工作意义重大。筛选了7个短串联重复序列（SSR）标记，分析了塔里木盆地沙生柽柳居群的遗传多样性。结果表明：尽管沙生柽柳呈片段化分布，物种水平上仍保持一定程度的遗传多样性，但居群的平均等位基因多样性较低；大多数居群经历了近期的瓶颈效应；自然居群被划分为4个遗传群体，分布于塔里木盆地腹地的群体内部有较强的基因流，但是位于盆地边缘的群体发生了明显的遗传分化。居群大规模遭受瓶颈效应可能是等位基因多样性偏低的主要原因；繁殖体沿河道的补给可能使盆地腹地群体维持较高遗传多样性；地理隔离可能是盆地边缘群体分化的主要因素。

关键词： 沙生柽柳(Tamarix taklamakanensis); 微卫星; 基因流; 遗传分化

本文引用格式

苏志豪 , 卓立 , 李文军 , 刘会良 , 康晓珊 , 姜小龙 . 塔里木盆地沙生柽柳(Tamarix taklamakanensis)遗传多样性[J]. 中国沙漠, 2018 , 38(5) : 1041 -1048 . DOI: 10.7522/j.issn.1000-694X.2017.00067

Abstract

Tamarix taklamakanensis is a tree endemic to China, and is the most drought-resistant and heat-resistant species for sand fixation, thus is significant to desert prevention and cure. Seven microsatellite loci were selected to analyse the genetic diversity of populations of T. taklamakanensis in the Tarim Basin. The research results reveal that although the species is severely fragmented distributed, it still remains a moderate genetic diversity, however the allelic diversity was low; most populations were detected to have experienced recent bottlenecks; natural populations were subdivided into 4 groups, and gene flow was high in the group distributed in the center of Tarim Basin, whereas significant genetic divergence was detected in geographically outlying groups. Bottleneck effects in most of the populations might lead to the loss of allelic diversity; propagule supplemented along the river system might contribute to the high level of genetic diversity in groups in the center of the basin; geographical isolation might mainly cause the genetic divergence in geographically outlying groups.

Key words： Tamarix taklamakanensis; microsatellite; gene flow; genetic divergence; conservation implication

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