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路东晔, 张国盛, 李娅翔, 郭文雨, 张玉琨, 于利峰, 呼斯楞, 敖民, 王爱君. 臭柏天然居群遗传多样性及演变历史分析[J]. 植物科学学报, 2020, 38(2): 151-161. DOI: 10.11913/PSJ.2095-0837.2020.20151
引用本文: 路东晔, 张国盛, 李娅翔, 郭文雨, 张玉琨, 于利峰, 呼斯楞, 敖民, 王爱君. 臭柏天然居群遗传多样性及演变历史分析[J]. 植物科学学报, 2020, 38(2): 151-161. DOI: 10.11913/PSJ.2095-0837.2020.20151
Lu Dong-Ye, Zhang Guo-Sheng, Li Ya-Xiang, Guo Wen-Yu, Zhang Yu-Kun, Yu Li-Feng, Hu Si-Leng, Ao Ming, Wang Ai-Jun. Genetic diversity and evolutionary history analysis of natural populations of Juniperus sabina L.[J]. Plant Science Journal, 2020, 38(2): 151-161. DOI: 10.11913/PSJ.2095-0837.2020.20151
Citation: Lu Dong-Ye, Zhang Guo-Sheng, Li Ya-Xiang, Guo Wen-Yu, Zhang Yu-Kun, Yu Li-Feng, Hu Si-Leng, Ao Ming, Wang Ai-Jun. Genetic diversity and evolutionary history analysis of natural populations of Juniperus sabina L.[J]. Plant Science Journal, 2020, 38(2): 151-161. DOI: 10.11913/PSJ.2095-0837.2020.20151

臭柏天然居群遗传多样性及演变历史分析

Genetic diversity and evolutionary history analysis of natural populations of Juniperus sabina L.

  • 摘要: 为了合理有效地保育天然臭柏(Juniperus sabina L.)种质资源,追溯和阐释其分布格局的历史成因,本文对我国内蒙古自治区、陕西省、甘肃省和青海省共10个天然臭柏居群388个个体的核糖体内转录间隔区(ITS)序列片段进行测序分析。结果显示:臭柏ITS序列总长度为1089 bp,共含有25个变异位点,定义32个单倍型,其中H4和H6单倍型为共有单倍型;分子变异分析(AMOVA)显示,臭柏居群变异主要来源于居群内,遗传变异为95.04%,而居群间遗传变异仅4.96%,居群间差异水平极显著(FST=0.0496,P<0.001);Network单倍型网络分析表明,H4和H6为古老单倍型,其他单倍型是由他们衍生而来;遗传分化系数NST(0.072)< GST(0.105),表明臭柏居群不存在明显的谱系地理结构,且历史上未经历过明显的扩张过程;单倍型最大简约树将32个单倍型聚为两大支;Mantel检验结果表明,臭柏居群间的遗传距离与地理距离无显著相关性(R2=0.0649,P>0.05)。推测臭柏起源于第三纪中新世(Miocene)中期约12.38 Mya,在第四纪冰期可能存在多个小型避难所。沙埋产生不定根的扩繁能力和较好的有性更新环境可能是沙地居群遗传多样性高于山地居群的决定性因素。

     

    Abstract: To conserve the natural germplasm resources of Juniperus sabina L. reasonably and effectively, the historical origin of the distribution pattern was traced and explained. In this paper, ribosomal DNA internal transcribed spacer (ITS) sequences of 388 individuals from 10 natural J. sabina populations in the Inner Mongolia Autonomous Region, Shaanxi, Gansu, and Qinghai Province of China were sequenced and analyzed. Results showed that the total length of the ITS sequence was 1089 bp, which contained 25 mutation sites and defined 32 haplotypes, including shared haplotypes H4 and H6. Based on molecular variation analysis (AMOVA), J. sabina exhibited mainly within-population variation, accounting for 95.04%, with only 4.96% of variation among populations. Differences between populations were significant (FST=0.0496, P<0.001). Haplotype network analysis showed that H4 and H6 were ancient haplotypes, from which other haplotypes were derived. The genetic differentiation coefficient NST (0.072) was less than GST (0.105), indicating that there was no obvious pedigree geographic structure in the J. sabina populations, and they had not experienced a significant expansion process in history. The maximum parsimony (MP) tree showed all haplotypes were divided into two clusters. Mantel test indicated that there was no significant correlation between genetic distance and geographic distance (R2=0.0649,P>0.05). It is speculated that J. sabina originated about 12.38 Mya in the Middle Miocene of the Tertiary, with possibly many small refuges of J. sabina in the Quaternary glacial period. Sand burial, which has a better ability to produce adventitious roots, and sexual regeneration environments may be the decisive factors for the higher genetic diversity of sandy land populations than that of mountain populations.

     

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