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bZIP71 delays flowering by suppressing Ehd1 expression in rice

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Journal of Integrative Plant Biology 2022年第7期64卷 1352-1363页

作者： Xiufeng Li Xiaojie Tian Mingliang He Xinxin Liu Zhiyong Li Jiaqi Tang enyang mei Min Xu Yingxiang Liu Zhenyu Wang Qingjie Guan Wei Meng Jun Fang Jian Zhang Qingyun Bu Northeast Institute of Geography and Agroecology Key Laboratory of Soybean Molecular Design Breedingthe Chinese Academy ofSciencesHarbin 150081China University of Chinese Academy of Sciences Beijing 100049China College of Life Science Northeast Forestry UniversityHarbin 150040China Key Laboratory of Saline-alkali Vegetation Ecology Restoration(Northeast Forestry University) Ministry of EducationHarbin 150040China State Key Lab of Rice Biology China National Rice Research InstituteHangzhou 311400China The Innovative Academy of Seed Design the Chinese Academy of SciencesBeijing 100101China

Flowering time is a fundamental factor determining the global distribution and final yield of rice(Oryza sativa).Although diverse flowering time genes have been reported in this crop,the transcriptional regulation of its key flowering genes are poorly understood.Here,we report that a basic leucine zipper transcription factor,bZIP71,functions as a flowering repressor.The overexpression of bZIP71 delays flowering,while the bzip71 mutant flowers early in both long-day and short-day conditions.A genetic analysis showed that the regulation of flowering by bZIP71 might be independent of Heading date 2(Hd2),Hd4,and Hd5.Importantly,bZIP71 directly associates with the Early heading date 1(Ehd1)promoter and represses its transcription,and genetically the function of bZIP71 is impaired in the ehd1 mutant.Moreover,bZIP71 interacts with major components of polycomb repressive complex 2(PRC2),SET domain group protein 711(SDG711),and Fertilization independent endosperm 2(FIE2),through which bZIP71 regulates the H3K27me3 level of Ehd1.Taken together,we present a transcriptional regulatory mechanism in which bZIP71 enhances the H3K27me3 level of Ehd1 and transcriptionally represses its expression,which not only offers a novel insight into a flowering pathway,but also provides a valuable putative target for the genetic engineering and breeding of elite rice cultivars.

关键词： flowering time H3K27me3 rice transcriptional regulation

Oryza sativa mediator subunit OsMED25 interacts with OsBZR1 to regulate brassinosteroid signaling and plant architecture in rice

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Journal of Integrative Plant Biology 2020年第6期62卷 793-811页

作者： Yuekun Ren Xiaojie Tian Shuyu Li enyang mei Mingliang He Jiaqi Tang Min Xu Xiufeng Li Zhenyu Wang Chuanyou Li Qingyun Bu Northeast Institute of Geography and Agroecology Key Laboratory of Soybean Molecular Design BreedingChinese Academy of SciencesHarbin 150081China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Plant Genomics and National Center for Plant Gene Research(Beijing) Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing 100101China The Innovative Academy of Seed Design Chinese Academy of SciencesBeijing 100101China

Brassinosteroids(BRs)are plant-specific steroid hormones which regulate plant growth,development,and adaptation.Transcriptional regulation plays key roles in plant hormone signaling.A mediator can serve as a bridge between gene-specific transcription factors and the RNA polymerase machinery,functioning as an essential component in regulating the transcriptional process.However,whether a mediator is involved in BR signaling is unknown.Here,we discovered that Oryza sativa mediator subunit 25(Os MED25)is an important regulator of rice BR signaling.Phenotypic analyses showed that the Os MED25-RNAi and osmed25 mutant presented erect leaves,as observed in BR-deficient mutants.In addition,the Os MED25-RNAi and osmed25 mutant exhibited decreased BR sensitivity.Genetic analysis indicated that Os MED25-RNAi could suppress the enhanced BR signaling phenotype of Osbzr1-D.Further biochemical analysis showed that Os MED25 interacts with Os BZR1 in vivo,and Os MED25 is enriched on the promoter of Os BZR1 target genes.RNA sequencing analysis indicated that Os MED25 affects the expression of approximately 45%of Os BZR1-regulated genes and mainly functions as a corepressor of Os BZR1.Together,these findings revealed that Os MED25 regulates rice BR signaling by interacting with Os BZR1 and modulating the expression of Os BZR1 target genes,thus expanding our understanding of the roles of mediators in plant hormone signaling.

关键词： plant Together analysis

OsMKKK70 regulates grain size and leaf angle in rice through the OsMKK4-OsMAPK6-OsWRKY53 signaling pathway

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Journal of Integrative Plant Biology 2021年第12期63卷 2043-2057页

作者： Zhiqi Liu enyang mei Xiaojie Tian Mingliang He Jiaqi Tang Min Xu Jiali Liu Lu Song Xiufeng Li Zhenyu Wang Qingjie Guan Qijiang Xu Qingyun Bu Key Laboratory of Saline-alkali Vegetation Ecology Restoration(Northeast Forestry University) Ministry of EducationHarbin 150040China College of Life Science Northeast Forestry UniversityHarbin 150040China Northeast Institute of Geography and Agroecology Key Laboratory of Soybean Molecular Design BreedingCASHarbin 150081China University of Chinese Academy of Sciences Beijing 100049China School of Laboratory Medicine Youjiang Medical University for NationalitiesBaise 533000China The Innovative Academy of Seed Design Chinese Academy of SciencesBeijing 100101China

Grain size and leaf angle are key agronomic traits that determine final yields in rice.However,the underlying molecular mechanisms are not well understood.Here we demonstrate that the Oryza sativa Mitogen Activated Protein Kinase Kinase Kinase OsMKKK70 regulates grain size and leaf angle in rice.Overexpressing OsMKKK70 caused plants to produce longer seeds.The osmkkk62/70 double mutant and the osmkkk55/62/70 triple mutant displayed significantly smaller seeds and a more erect leaf angle compared to the wild type,indicating that OsMKKK70 functions redundantly with its homologs Os MKKK62 and Os MKKK55.Biochemical analysis demonstrated that OsMKKK70 is an active kinase and that OsMKKK70 interacts with Os MKK4 and promotes Os MAPK6 phosphorylation.In addition,the osmkkk62/70 double mutant showed reduced sensitivity to Brassinosteroids(BRs).Finally,overexpressing constitutively active Os MKK4,Os MAPK6,and Os WRKY53 can partially complement the smaller seed size,erect leaf,and BR hyposensitivity of the osmkkk62/70 double mutant.Taken together,these findings suggest that OsMKKK70 might regulate grain size and leaf angle in rice by activating Os MAPK6 and that OsMKKK70,Os MKK4,Os MAPK6,and Os WRKY53 function in a common signaling pathway that controls grain shape and leaf angle.

关键词： Brassinosteroids MAPK signaling OsMKKK70 rice seed size

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素质教育与教师素质

沈阳工程学院学报（自然科学版） 2002年第2期4卷 60-62页

作者：高峰郝冬梅东北大学秦皇岛分校河北秦皇岛066004 东北大学理学院辽宁沈阳110004

论述了素质教育的基本内涵和素质教育与教师素质的因果关系。提出了在实施素质教育过程中,教师应具备的素质。

关键词：素质教育教师素质教师学生

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四川省近20年天然林资源景观格局变化研究

资源开发与市场 2019年第10期35卷 1258-1261页

作者：姚劲松杨鹏翟辉王腊梅四川省森林和草原防火监测中心四川成都610084 巴中市恩阳区农林局四川巴中636000 广元市昭化区林业局四川广元628021 甘孜州林业局四川甘孜626000

四川省实施天然林保护工程至今已有20余年,包括天然林资源在内的各类森林资源发生了较大变化,因此有必要开展天然林资源动态变化研究,探讨其内部结构与变化趋势,为天然林后续保护与管理提供科学参考。基于概率论与数理统计和景观生态学... 详细信息

四川省实施天然林保护工程至今已有20余年,包括天然林资源在内的各类森林资源发生了较大变化,因此有必要开展天然林资源动态变化研究,探讨其内部结构与变化趋势,为天然林后续保护与管理提供科学参考。基于概率论与数理统计和景观生态学原理,利用全省1997年和2017年两期森林资源连续清查固定样地数据,选取景观连通性指数作为分析指标,定量分析与解释了近20年四川省天然林资源景观格局的主要变化规律和特征。结果表明:过去20年四川省天然林景观连通性指数增加了0.06,天然林空间分布总体呈现连通趋势,森林资源得到有效恢复,但同时也存在部分林分质量不高、结构不合理等问题,需进一步加大资金投入,开展科学研究和技术创新,探索天然林资源经营管理方法和措施,不断提升天然林质量,优化林分结构。

关键词：天然林景观连通性指数景观格局连续清査

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四川省恩阳区药用植物资源调查与分析

经济林研究 2020年第4期38卷 22-31页

作者：肖兴翠杨滨豪李金武何芝然史亮王泽亮辜云杰张美罗冰四川省林业科学研究院四川成都610081 四川省中医药科学院四川成都610041

【目的】摸清恩阳区药用植物资源种类及其分布规律,分析该区药用植物资源的多样性特征,为该区药用植物资源的保护和开发利用提供参考。【方法】按照第4次全国中药资源普查的要求,采用样方和样线调查法,对恩阳区药用植物进行野外调查,统... 详细信息

【目的】摸清恩阳区药用植物资源种类及其分布规律,分析该区药用植物资源的多样性特征,为该区药用植物资源的保护和开发利用提供参考。【方法】按照第4次全国中药资源普查的要求,采用样方和样线调查法,对恩阳区药用植物进行野外调查,统计恩阳区药用植物科、属、种构成,并对其生活型、药用功效和药用部位进行分类统计。【结果】本次调查到恩阳区的药用植物有136科443属661种。在科的构成上,以寡种科最多,占总科数的44.8%;在属的构成上,单种属占绝对优势,占总属数的74.0%。在生活型构成上,草本药用植物略多于木本药用植物,分别占恩阳区药用植物总种数的61.7%和38.3%。在草本药用植物中,以多年生草本为主,占总种数的38.7%;在木本药用植物中,以灌木和小乔木为最多,占总种数的22.4%。恩阳区药用植物的功效以清热和解毒为主,分别有314和308种,分别占总种数的47.5%和46.6%。恩阳区的药用植物以全草或全株入药的植物最多,有297种,占总种数的44.9%。本次调查到的药用植物中有33种野生重点药用植物,其中草本药用植物占93.9%。【结论】恩阳区的药用植物资源种类丰富,药用植物生活型、药用功效和药用部位类型多样,有较大的保护、开发和利用价值。尤其是重点草本药用植物,收获期短,具有较大的栽培和利用价值。

关键词：药用植物多样性生活型药用功效药用部位恩阳区