植物生态学报 ›› 2024, Vol. 48 ›› Issue (1): 56-67.DOI: 10.17521/cjpe.2022.0343

• 研究论文 • 上一篇    下一篇

新疆同域分布梭梭和白梭梭多样性格局及其形成机制

陈雨婷1, 马松梅1,*()(), 张丹2, 张林1, 王春成2   

  1. 1石河子大学理学院, 绿洲城镇与山盆生态系统兵团重点实验室, 新疆石河子 832000
    2石河子大学生命科学学院, 绿洲城镇与山盆生态系统兵团重点实验室, 新疆石河子 832000
  • 收稿日期:2022-08-24 接受日期:2023-02-08 出版日期:2024-01-20 发布日期:2023-03-01
  • 通讯作者: (shzmsm@126.com) ORCID: 0000-0002-3107-2256
  • 基金资助:
    国家自然科学基金(41561007);国家自然科学基金(41261011)

Diversity pattern and formation mechanism of sympatric Haloxylon ammodendron and Haloxylon persicum in Xinjiang, China

CHEN Yu-Ting1, MA Song-Mei1,*()(), ZHANG Dan2, ZHANG Lin1, WANG Chun-Cheng2   

  1. 1Xinjiang Production and Construction Corps Key Laboratory of Oasis Town and Mountain-basin System Ecology, College of Science, Shihezi University, Shihezi, Xinjiang 832000, China
    2Xinjiang Production and Construction Corps Key Laboratory of Oasis Town and Mountain-basin System Ecology, College of Life Sciences, Shihezi University, Shihezi, Xinjiang 832000, China
  • Received:2022-08-24 Accepted:2023-02-08 Online:2024-01-20 Published:2023-03-01
  • Contact: (shzmsm@126.com)
  • Supported by:
    National Natural Science Foundation of China(41561007);National Natural Science Foundation of China(41261011)

摘要:

探究第四纪气候波动和地质事件对古尔班通古特沙漠同域分布的梭梭(Haloxylon ammodendron)和白梭梭(H. persicum)分布、分化和演化的影响, 对了解旱生植物区系的发展与演化具有重要意义。该研究测定新疆自然分布的19个梭梭种群225个个体和12个白梭梭种群106个个体叶绿体DNA间隔区(trnS-trnG和trnV)序列, 整合单倍型网络分析、主坐标分析、分子方差分析、贝叶斯系统发育树、地理加权回归分析揭示种间、种内不同地理种群间的遗传多样性及其环境解释、空间遗传结构, 估算种间谱系分化时间, 分析群体演化历史。主要结果有: (1)共定义了21个叶绿体单倍型, 梭梭和白梭梭聚为独立的支系; (2)接近80%的遗传变异发生于物种间及梭梭种内不同地理种群间, 物种间分化发生于上新世晚期至更新世早期, 这可能受干旱化加剧和沙漠形成、扩展的共同影响; (3)地理加权回归模型结果显示, 环境因子对梭梭和白梭梭遗传多样性的影响存在明显的空间差异性, 气候和土壤因子总体上主导梭梭、白梭梭的遗传多样性格局: 在古尔班通古特沙漠南缘, 气候因子对梭梭和白梭梭均为显著正向作用; 在沙漠西南缘, 气候因子对白梭梭为正向作用, 土壤因子对梭梭为负向作用; 在沙漠东南缘, 土壤因子对梭梭主要为正向作用, 对白梭梭为负向作用; 在阿勒泰地区, 气候因子对梭梭和白梭梭均为正向作用。

关键词: 梭梭, 白梭梭, 遗传变异格局, 物种分化, 地理加权回归

Abstract:

Aims In order to understand the development and evolution of xerophyte flora, it is important to explore the effects of the Quaternary climatic fluctuations and geological events on the distribution, genetic differentiation and evolution of Haloxylon ammodendron and H. persicum in the Gurbantünggüt Desert.

Methods Two chloroplast DNA spacers (trnS-trnG and trnV) were sequenced for 225 individuals from 19 naturally distributed H. ammodendron populations and 106 individuals from 12 H. persicum populations in Xinjiang. Haplotype Network analysis (Network), Principal Co-ordinates Analysis (PCoA), Analysis of Molecular Variance (AMOVA), Bayesian inference trees (BEAST), and Geographically weighted regression (GWR) were integrated to reveal the genetic diversity and environmental interpretation of different geographic populations within and between species, to estimate the time of interspecific lineage divergence and to analyze the demographical history.

Important findings (1) A total of 21 chloroplast haplotypes were identified, and H. ammodendron and H. persicum were clustered into independent clades. (2) Nearly 80% of the genetic variation occurred between species and among different geographical populations of H. ammodendron. The interspecies differentiation occurred from the late Pliocene to the early Pleistocene, which may have been affected by increasing aridity, mountain uplift on the Qingzang Plateau and desert expansion. (3) The results of the geographically weighted regression model showed distinct effects of the environmental factors on spatial heterogeneity of genetic diversity for H. ammodendron and H. persicum. On the whole, the climatic and soil factors had dominated the spatial pattern of genetic diversity for H. ammodendron and H. persicum. In the southern margin of the Gurbantünggüt Desert, climatic factors had positive effects on genetic diversity of H. ammodendron and H. persicum. In the southwestern margin of the desert, climatic factors had a positive effect on H. persicum, while soil factors had a negative effect on H. ammodendron. In the southeastern part of the desert, soil factors had a positive effect on H. ammodendron and a negative effect on H. persicum. In the Altay Region, climatic factors positively influenced both H. ammodendron and H. persicum.

Key words: Haloxylon ammodendron, Haloxylon persicum, genetic variation pattern, species differentiation, geographically weighted regression