检索结果-南通市图书馆

Epigenetic Programming： The Challenge to species hybridization

Molecular Plant 2009年第4期2卷 589-599页

作者： Ryo Ishikawa Tetsu Kinoshita Plant Reproductive Genetics GCOE Research Group Graduate School of Biological Science Nara Institute of Science and Technology 8916-5 Takayama IkomaNara 630-0192 Japan

In many organisms, the genomes of individual species are isolated by a range of reproductive barriers that act before or after fertilization. Successful mating between species results in the presence of different genomes within a cell （hybridization）, which can lead to incompatibility in cellular events due to adverse genetic interactions. In addition to such genetic interactions, recent studies have shown that the epigenetic control of the genome, silencing of transposons, control of non-additive gene expression and genomic imprinting might also contribute to reproductive barriers in plant and animal species. These genetic and epigenetic mechanisms play a significant role in the prevention of gene flow between species. In this review, we focus on aspects of epigenetic control related to hybrid incompatibility during species hybrid- ization, and also consider key mechanism（s） in the interaction between different genomes.

关键词： Endosperm epigenetics genomic imprinting species hybridization transposon.

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Extensive gene flow in secondary sympatry after allopatric speciation

引用

National Science Review 2022年第12期9卷 24-36页

作者： Xinfeng Wang Ziwen He Zixiao Guo Ming Yang Shaohua Xu Qipian Chen Shao Shao Sen Li Cairong Zhong Norman C.Duke Suhua Shi State Key Laboratory of Biocontrol Guangdong Key Laboratory of Plant Resources School of Life SciencesSouthern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Sun Yat-sen University Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering School of Life Sciences Fudan University Department of Laboratory Medicine& Pathology University of Washington Hainan Academy of Forestry (Hainan Academy of Mangrove) Centre for Tropical Water and Aquatic Ecosystem Research James Cook University

In the conventional view,species are separate gene pools delineated by reproductive isolation(RI).In an alternative view,species may also be delineated by a small set of ’speciation genes’ without full RI,a view that has gained broad acceptance.A recent survey,however,suggested that the extensive literature on’speciation with gene flow’ is mostly(if not all) about exchanges in the early stages of speciation.There is no definitive evidence that the observed gene flow actually happened after speciation is completed.Here,we wish to know whether ’good species’(defined by the ’secondary sympatry’ test) do continue to exchange genes and,importantly,under what conditions such exchanges can be observed.De novo whole-genome assembly and re-sequencing of individuals across the range of two closely related mangrove species(Rhizophora mucronata and R. stylosa) reveal the genomes to be well delineated in allopatry.They became sympatric in northeastern Australia but remain distinct species.Nevertheless,their genomes harbor～4000-10 000 introgression blocks averaging only about 3-4 Kb.These fine-grained introgressions indicate continual gene flow long after speciation as non-introgressable ’genomic islets,’～1.4 Kb in size,often harbor diverging genes of flower or gamete development.The fine-grained introgression in secondary sympatry may help settle the debate about sympatric vs.micro-allopatric speciation.In conclusion,true’good species’ may often continue to exchange genes but the opportunity for detection is highly constrained.

关键词： mangroves population genomics speciation introgression species hybridization

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：