用烟草花叶病毒弱毒株系N14预先接种,可以诱导烟草对病原真菌赤星病菌的系统获得性抗性(SAR),减轻病菌引起的赤星病。选择表现诱导抗性最强植株材料进行组织培养与植株再生,通过体细胞无性系变异增强和巩固SAR性状,获得SAR组成性表达的...用烟草花叶病毒弱毒株系N14预先接种,可以诱导烟草对病原真菌赤星病菌的系统获得性抗性(SAR),减轻病菌引起的赤星病。选择表现诱导抗性最强植株材料进行组织培养与植株再生,通过体细胞无性系变异增强和巩固SAR性状,获得SAR组成性表达的突变体(constitutive expresser of SAR)ces2-1。除了抗病表型,ces2-1还组成性表达多种防卫反应基因。回交实验与遗传分析表明,ces2-1是在野生型位点上的单基因显性突变。对ces2-1与野生型进行mRNA差异显示分析,得到一个ces2-1独有、在野生型中缺少的转录本,与前人报道的烟草受过氧化氢诱导的一个基因片段同源。用cDNA末端快速扩增技术克隆了这个转录本的全长序列,根据生物信息学分析与功能的初步测定,把这个基因命名为烟草受过氧化氢诱导的抗病相关基因(hydrogen peroxide-induced1,NtHPI1)。展开更多
Associations between 3D chromatin architectures and epigenetic modifications have been characterized in animals.However,any impact of DNA methylation on chromatin architecture in plants is understudied,which is confin...Associations between 3D chromatin architectures and epigenetic modifications have been characterized in animals.However,any impact of DNA methylation on chromatin architecture in plants is understudied,which is confined to Arabidopsis thaliana.Because plant species differ in genome size,composition,and overall chromatin packing,it is unclear to what extent findings from A.thaliana hold in other species.Moreover,the incomplete chromatin architectural profiles and the low-resolution high-throughput chromosome conformation capture(Hi-C)data from A.thaliana have hampered characterizing its subtle chromatin structures and their associations with DNA methylation.We constructed a high-resolution Hi-C interaction map for the null OsMET1-2(the major CG methyltransferase in rice)mutant(osmet1-2)and isogenic wild-type rice(WT).Chromatin structural changes occurred in osmetl-2,including intra-/inter-chromosomal interactions,compartment transition,and topologically associated domains(TAD)variations.Our findings provide novel insights into the potential function of DNA methylation in TAD formation in rice and confirmed DNA methylation plays similar essential roles in chromatin packing in A,thaliana and rice.展开更多
文摘用烟草花叶病毒弱毒株系N14预先接种,可以诱导烟草对病原真菌赤星病菌的系统获得性抗性(SAR),减轻病菌引起的赤星病。选择表现诱导抗性最强植株材料进行组织培养与植株再生,通过体细胞无性系变异增强和巩固SAR性状,获得SAR组成性表达的突变体(constitutive expresser of SAR)ces2-1。除了抗病表型,ces2-1还组成性表达多种防卫反应基因。回交实验与遗传分析表明,ces2-1是在野生型位点上的单基因显性突变。对ces2-1与野生型进行mRNA差异显示分析,得到一个ces2-1独有、在野生型中缺少的转录本,与前人报道的烟草受过氧化氢诱导的一个基因片段同源。用cDNA末端快速扩增技术克隆了这个转录本的全长序列,根据生物信息学分析与功能的初步测定,把这个基因命名为烟草受过氧化氢诱导的抗病相关基因(hydrogen peroxide-induced1,NtHPI1)。
基金the National Natural Science Foundation of China(Grant No.31670220)the Program of Changbai Mountain Scholar。
文摘Associations between 3D chromatin architectures and epigenetic modifications have been characterized in animals.However,any impact of DNA methylation on chromatin architecture in plants is understudied,which is confined to Arabidopsis thaliana.Because plant species differ in genome size,composition,and overall chromatin packing,it is unclear to what extent findings from A.thaliana hold in other species.Moreover,the incomplete chromatin architectural profiles and the low-resolution high-throughput chromosome conformation capture(Hi-C)data from A.thaliana have hampered characterizing its subtle chromatin structures and their associations with DNA methylation.We constructed a high-resolution Hi-C interaction map for the null OsMET1-2(the major CG methyltransferase in rice)mutant(osmet1-2)and isogenic wild-type rice(WT).Chromatin structural changes occurred in osmetl-2,including intra-/inter-chromosomal interactions,compartment transition,and topologically associated domains(TAD)variations.Our findings provide novel insights into the potential function of DNA methylation in TAD formation in rice and confirmed DNA methylation plays similar essential roles in chromatin packing in A,thaliana and rice.
