CYCLOIDEA （CYC）-like TCP genes play key roles in dorsoventral differentiation of zygomorphic flowers in Papilionoideae legumes. In this study, we analyzed the kew mutants whose flowers lost lateral identity, and inv...CYCLOIDEA （CYC）-like TCP genes play key roles in dorsoventral differentiation of zygomorphic flowers in Papilionoideae legumes. In this study, we analyzed the kew mutants whose flowers lost lateral identity, and investigated the diverse functions of three LjCYC genes during zygomorphic flower development in the model legume Lotus japonicus. We showed that kew1 and kew3 are allelic mutants of LjCYC3, a CYC-like TCP gene. Through transgenic experiments, it was shown that LjCYC1 possesses dorsal activity similar to LjCYC2, and that LjCYC3 alone is sufficient to confer lateral activity, and an epistatic effect between dorsal and lateral activities was identified. Sequence analysis revealed a striking alteration at the 3 end of the LjCYC3 open reading frame （ORF） in comparison with those of LjCYC1 and LjCYC2 ORFs. Furthermore, it was found that LjCYC proteins could interact with each other and possess different activities by means of a transcriptional activity assay. Our data demonstrate that the sequence variation and the subsequent alteration of protein property play important roles in the functional diversity of different LjCYC genes in controlling zygomorphic flower development in Lotus japonicus.展开更多
Anthocyanins are important natural plant pigments and play diverse roles in plant growth and adaptation.Anthocyanins function as screens to protect photosynthetic tissues from photoinhibition.However,the regulatory me...Anthocyanins are important natural plant pigments and play diverse roles in plant growth and adaptation.Anthocyanins function as screens to protect photosynthetic tissues from photoinhibition.However,the regulatory mechanisms underlying the biosynthesis and spatial accumulation pattern of anthocyanins remain some unresolved issues.Here,we demonstrate that the GARP-type transcription factor GOLDEN2-LIKE 1(GLK1)functions as a positive factor in anthocyanin accumulation.GLK1 enhances the transcriptional activation activities of MYB75,MYB90,and MYB113 via direct proteinprotein interactions to increase the expression of anthocyanin-specific biosynthetic genes.Anthocyanins accumulate in an acropetal manner in Arabidopsis.We also found that the expression pattern of GLK1 overall mimicked the accumulation pattern of anthocyanin from the base of the main stem to the shoot apex.Based on these findings,we established a working model for the role of GLK1 in anthocyanin accumulation and propose that GLK1mediates the spatial distribution pattern of anthocyanins by affecting the transcriptional activation activities of MYB75,MYB90,and MYB113.展开更多
目的构建人糖皮质激素受体变异体表达载体,研究其表达和功能。方法运用RT-nested PCR扩增糖皮质激素受体不含有编码LBD(ligand b ind ing dom ain)的cDNA序列,将PCR产物定向克隆至pEGFP-N2质粒载体,测序筛选重组质粒;荧光显微镜观察重...目的构建人糖皮质激素受体变异体表达载体,研究其表达和功能。方法运用RT-nested PCR扩增糖皮质激素受体不含有编码LBD(ligand b ind ing dom ain)的cDNA序列,将PCR产物定向克隆至pEGFP-N2质粒载体,测序筛选重组质粒;荧光显微镜观察重组质粒转染表达情况;相对荧光素酶法检测GR转录激活活性。结果扩增出长1 601 bp的cDNA序列,测序证实:克隆片段与Genbank该基因序列同源性为100%;重组质粒表达产物定位于细胞核;转染组细胞转录激活活性增强。结论成功构建糖皮质激素受体变异体的表达载体,该变异体具有不依赖激素的转录激活活性。展开更多
基金supported by the National Natural Science Foundation of China (30930009)the Ministry of Agriculture of China for Transgenic Research (2011ZX08009-003 and 2009ZX08009-112)
文摘CYCLOIDEA （CYC）-like TCP genes play key roles in dorsoventral differentiation of zygomorphic flowers in Papilionoideae legumes. In this study, we analyzed the kew mutants whose flowers lost lateral identity, and investigated the diverse functions of three LjCYC genes during zygomorphic flower development in the model legume Lotus japonicus. We showed that kew1 and kew3 are allelic mutants of LjCYC3, a CYC-like TCP gene. Through transgenic experiments, it was shown that LjCYC1 possesses dorsal activity similar to LjCYC2, and that LjCYC3 alone is sufficient to confer lateral activity, and an epistatic effect between dorsal and lateral activities was identified. Sequence analysis revealed a striking alteration at the 3 end of the LjCYC3 open reading frame （ORF） in comparison with those of LjCYC1 and LjCYC2 ORFs. Furthermore, it was found that LjCYC proteins could interact with each other and possess different activities by means of a transcriptional activity assay. Our data demonstrate that the sequence variation and the subsequent alteration of protein property play important roles in the functional diversity of different LjCYC genes in controlling zygomorphic flower development in Lotus japonicus.
基金supported by grants from the National Natural Science Foundation of China(31970263 to HL32070213 to DZ)+4 种基金the Sichuan Science and Technology Program(2022JDRC0032)Open Project Funding of the State Key Laboratory of Crop Stress Adaptation and Improvementthe Institutional Research Fund of Sichuan University(2020SCUNL212)the Fundamental Research Funds for the Central Universities(SCU2020D003)the Sichuan Forage Innovation Team Program。
文摘Anthocyanins are important natural plant pigments and play diverse roles in plant growth and adaptation.Anthocyanins function as screens to protect photosynthetic tissues from photoinhibition.However,the regulatory mechanisms underlying the biosynthesis and spatial accumulation pattern of anthocyanins remain some unresolved issues.Here,we demonstrate that the GARP-type transcription factor GOLDEN2-LIKE 1(GLK1)functions as a positive factor in anthocyanin accumulation.GLK1 enhances the transcriptional activation activities of MYB75,MYB90,and MYB113 via direct proteinprotein interactions to increase the expression of anthocyanin-specific biosynthetic genes.Anthocyanins accumulate in an acropetal manner in Arabidopsis.We also found that the expression pattern of GLK1 overall mimicked the accumulation pattern of anthocyanin from the base of the main stem to the shoot apex.Based on these findings,we established a working model for the role of GLK1 in anthocyanin accumulation and propose that GLK1mediates the spatial distribution pattern of anthocyanins by affecting the transcriptional activation activities of MYB75,MYB90,and MYB113.
文摘目的构建人糖皮质激素受体变异体表达载体,研究其表达和功能。方法运用RT-nested PCR扩增糖皮质激素受体不含有编码LBD(ligand b ind ing dom ain)的cDNA序列,将PCR产物定向克隆至pEGFP-N2质粒载体,测序筛选重组质粒;荧光显微镜观察重组质粒转染表达情况;相对荧光素酶法检测GR转录激活活性。结果扩增出长1 601 bp的cDNA序列,测序证实:克隆片段与Genbank该基因序列同源性为100%;重组质粒表达产物定位于细胞核;转染组细胞转录激活活性增强。结论成功构建糖皮质激素受体变异体的表达载体,该变异体具有不依赖激素的转录激活活性。
