北京师范大学学报（自然科学版）2016，Vol.52Issue(1)：27-31,5.DOI:10.16360/j.cnki.jbnuns.2016.01.008
同域培养下大肠杆菌氮、磷含量的进化趋异研究
Evolutionary divergence of nitrogen and phosphorus content in Escherichia coli strains under sympatric evolution
摘要
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 focus 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 1 100 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.关键词
实验进化/氮/磷含量/进化改变/性状趋异Key words
experimental evolution/nitrogen/phosphorus content/evolutionary change/character divergence分类
生物科学引用本文复制引用
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):27-31,5.基金项目
国家自然科学基金资助项目(31030014) （31030014）
