miR166作为重要的转录后调节因子,在植物的生长发育和对逆境胁迫的反应中扮演着重要的角色。利用PmiREN、Ensembl Plants数据库、MEGA-X、DNAMAN软件以及RNAfold web server、WebLogo和psRNA Target在线网站对小麦miR166(Tae-miR166)基...miR166作为重要的转录后调节因子,在植物的生长发育和对逆境胁迫的反应中扮演着重要的角色。利用PmiREN、Ensembl Plants数据库、MEGA-X、DNAMAN软件以及RNAfold web server、WebLogo和psRNA Target在线网站对小麦miR166(Tae-miR166)基因家族的进化特性和表达模式进行分析。在PmiREN数据库中搜索到19个Tae-miR166基因家族成员,染色体定位发现Tae-miR166成员定位于14条染色体上。序列比对发现Tae-miR166的成熟体序列高度保守。进化分析结果表明,Tae-miR166基因家族成员分别处于4个进化分支。靶基因预测结果表明,Tae-miR166的靶基因包括Ⅲ类同源异型结构域亮氨酸拉链蛋白、β半乳糖苷酶和钙依赖性蛋白激酶等。转录组数据分析表明Tae-miR166家族19个成员在小麦6个组织中都有表达,在籽粒和穗中表达量最高。荧光定量PCR结果表明,Tae-miR166家族15个成员在镉、干旱和低温胁迫处理后的表达模式存在差异,说明Tae-miR166基因家族在植株抵御非生物胁迫时发挥着重要作用。本研究为进一步阐明Tae-miR166基因家族的功能提供了理论依据。展开更多
Leaf,spike,stem,and root morphologies are key factors that determine crop growth,development,and productivity.Multiple genes that control these morphological traits have been identified in Arabidopsis,rice,maize,and o...Leaf,spike,stem,and root morphologies are key factors that determine crop growth,development,and productivity.Multiple genes that control these morphological traits have been identified in Arabidopsis,rice,maize,and other plant species.However,little is known about the genomic regions and genes associated with morphological traits in wheat.Here,we identified the ethyl methanesulfonate-derived mutant wheat line M133 that displays multiple morphological changes that include upward-curled leaves,paired spikelets,dwarfism,and delayed heading.Using bulked segregant RNA sequencing(BSR-seq)and a high-resolution genetic map,we identified TraesCS1D02G155200(HBD2)as a potential candidate gene.HB-D2 encodes a class III homeodomain-leucine zipper(HD-ZIP III)transcription factor,and the mutation was located in the miRNA165/166 complementary site,resulting in a resistant allele designated rHb-D2.The relative expression of rHb2 in the mutant plants was significantly higher(P<0.01)than in plants homozygous for the WT allele.Independent resistant mutations that disrupt the miRNA165/166 complementary sites in the A-(rHb-A2)and B-genome(rHb-B2)homoeologs showed similar phenotypic alterations,but the relative intensity of the effects was different.Transgenic plants expressing rHb-D2 gene driven by the maize UBIQUITIN(UBI)promoter showed similar phenotypes to the rHb-D2 mutant.These results confirmed that HB-D2 is the causal gene responsible for the mutant phenotypes.Finally,a survey of 1397 wheat accessions showed that the complementary sites for miRNA165/166 in all three HB2 homoeologs are highly conserved.Our results suggest that HB2 plays an important role in regulating growth and development in wheat.展开更多
文摘miR166作为重要的转录后调节因子,在植物的生长发育和对逆境胁迫的反应中扮演着重要的角色。利用PmiREN、Ensembl Plants数据库、MEGA-X、DNAMAN软件以及RNAfold web server、WebLogo和psRNA Target在线网站对小麦miR166(Tae-miR166)基因家族的进化特性和表达模式进行分析。在PmiREN数据库中搜索到19个Tae-miR166基因家族成员,染色体定位发现Tae-miR166成员定位于14条染色体上。序列比对发现Tae-miR166的成熟体序列高度保守。进化分析结果表明,Tae-miR166基因家族成员分别处于4个进化分支。靶基因预测结果表明,Tae-miR166的靶基因包括Ⅲ类同源异型结构域亮氨酸拉链蛋白、β半乳糖苷酶和钙依赖性蛋白激酶等。转录组数据分析表明Tae-miR166家族19个成员在小麦6个组织中都有表达,在籽粒和穗中表达量最高。荧光定量PCR结果表明,Tae-miR166家族15个成员在镉、干旱和低温胁迫处理后的表达模式存在差异,说明Tae-miR166基因家族在植株抵御非生物胁迫时发挥着重要作用。本研究为进一步阐明Tae-miR166基因家族的功能提供了理论依据。
基金supported by the Provincial Natural Science Foundation of Shandong(ZR2021MC056 and ZR2021ZD30)the Open Project Funding of the State Key Laboratory of Crop Stress Adaptation and Improvementfunded by Competitive Grant 202268013-36439(WheatCAP)from the USDA National Institute of Food and Agriculture。
文摘Leaf,spike,stem,and root morphologies are key factors that determine crop growth,development,and productivity.Multiple genes that control these morphological traits have been identified in Arabidopsis,rice,maize,and other plant species.However,little is known about the genomic regions and genes associated with morphological traits in wheat.Here,we identified the ethyl methanesulfonate-derived mutant wheat line M133 that displays multiple morphological changes that include upward-curled leaves,paired spikelets,dwarfism,and delayed heading.Using bulked segregant RNA sequencing(BSR-seq)and a high-resolution genetic map,we identified TraesCS1D02G155200(HBD2)as a potential candidate gene.HB-D2 encodes a class III homeodomain-leucine zipper(HD-ZIP III)transcription factor,and the mutation was located in the miRNA165/166 complementary site,resulting in a resistant allele designated rHb-D2.The relative expression of rHb2 in the mutant plants was significantly higher(P<0.01)than in plants homozygous for the WT allele.Independent resistant mutations that disrupt the miRNA165/166 complementary sites in the A-(rHb-A2)and B-genome(rHb-B2)homoeologs showed similar phenotypic alterations,but the relative intensity of the effects was different.Transgenic plants expressing rHb-D2 gene driven by the maize UBIQUITIN(UBI)promoter showed similar phenotypes to the rHb-D2 mutant.These results confirmed that HB-D2 is the causal gene responsible for the mutant phenotypes.Finally,a survey of 1397 wheat accessions showed that the complementary sites for miRNA165/166 in all three HB2 homoeologs are highly conserved.Our results suggest that HB2 plays an important role in regulating growth and development in wheat.
