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标题

同域培养下大肠杆菌氮、磷含量的进化趋异研究

作者

赵 琳 倪 川 张全国 张大勇

机构

北京师范大学生物多样性与生态工程教育部重点实验室

摘要

对自然界多个动物类群的研究发现同域物种在资源利用性状上的差异更大。这种性状趋异现象被认为是资源竞争最可能的选择结果。然而近来有理论研究认为,对必需性资源的竞争会导致性状趋同。有一些利用微生物系统来研究资源竞争影响的实验,但只在较短尺度上关注了可替代资源的竞争。本研究利用9株具有不同进化背景的大肠杆菌构成5个短期可竞争共存的祖先配对,在限定两种必需资源(氮、磷)的环境下,对5个进化组下的6个重复家系进行了约1100世代的选择实验,考察了这些细菌在进化前后菌体氮、磷含量的变化,并评估了这些性状的趋异程度。研究发现:后代细菌氮含量的变动范围在13.1~14.2%,而磷含量为1.70~1.95%;不同进化组内,细菌氮、磷含量改变的模式不同;同域后代细菌的趋异模式也并不相同。推测细菌的进化过程本身可能会产生许多独特的性状,连同生态相互作用一起,增加了结果的复杂性,需要在更精细的水平上寻找产生这种结果的原因。

关键词

实验进化;氮、磷含量;进化改变;性状趋异

引用

赵 琳, 倪 川, 张全国, 张大勇. 同域培养下大肠杆菌氮、磷含量的进化趋异研究[J]. 北京师范大学学报(自然科学版), 2016, 52(1): 27-31.

基金

国家自然科学基金资助项目(31030014)

分类号

Q931

DOI

10.16360/j.cnki.jbnuns.2016.01.008

Title

Evolutionary divergence of nitrogen and phosphorus content in Escherichia coli strains under sympatric evolution

Author

ZHAO Lin, NI Chuan, ZHANG Quanguo, ZHANG Dayong

Affiliations

Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, Beijing Normal University

Abstract

Observations on many animal taxa in nature suggest that sympatric species show greater divergence in resource utilization traits. This character divergence was thought to be the most possible consequence of selection driven by resource competition. Recently, however, some theoretical studies indicate that competition for essential resources would lead to character convergence. A few experimental studies employing microbial model systems were designed to examine the influence of resource competition on diversification, but the focuse was on substitute resources in short term. In this study, we paired nine Escherichia coli strains with different evolutionary history into five selection groups, wherein two certain strains could co-exist ecologically in each group. Sympatric evolution was initiated in six replicate lines for each ancestral pair under a chemically defined environment which was both nitrogen and phosphorus limited. For all the ancestral and derivative strains, nitrogen and phosphorus contents were measured and their evolutionary divergence was assessed after evolution of about 1100 generations. Nitrogen content for derived strains ranged from 13.1 - 14.2%, while their phosphorus content varied from 1.70 - 1.95%. Patterns of both elemental change and evolutionary divergence varied among the five groups. We assumed that evolutionary dynamics of bacteria alone might generate many mutations and shape unique characters; the interaction between ecological and evolutionary dynamics complicated the results. To understand the forces behind these observations, more researches are needed on a much finer scale.

Key words

experimental evolution;nitrgen / phosphorus content;evolutionary change;character divergence

cite

ZHAO Lin, NI Chuan, ZHANG Quanguo, ZHANG Dayong.Evolutionary divergence of nitrogen and phosphorus content in Escherichia coli strains under sympatric evolution[J]. Journal of Beijing Normal University(Natural Science),2016, 52(1): 27-31.

DOI

10.16360/j.cnki.jbnuns.2016.01.008

Copyright © 2014 Journal of Beijing Normal University (Natural Science)
Designed by Mr. Sun Chumin. Email: cmsun@mail.bnu.edu.cn