Dataset Information

Genome-wide analysis of Jatropha curcas MADS-box gene family and functional characterization of the JcMADS40 gene in transgenic rice.

ABSTRACT: BACKGROUND:Physic nut (Jatropha curcas), an inedible oilseed plant, is among the most promising alternative energy sources because of its high oil content, rapid growth and extensive adaptability. Proteins encoded by MADS-box family genes are important transcription factors participated in regulating plant growth, seed development and responses to abiotic stress. However, there has been no in-depth research on the MADS-box genes and their roles in physic nut. RESULTS:In our study, 63 MADS-box genes (JcMADSs) were identified in the physic nut genome, and classed into five groups (MIKCC, M?, M?, M?, MIKC*) according to phylogenetic comparison with Arabidopsis homologs. Expression profile analysis based on RNA-seq suggested that many JcMADS genes had the strongest expression in seeds, and seven of them responded in leaves to at least one abiotic stressor (drought and/or salinity) at one or more time points. Transient expression analysis and a transactivation assay indicated that JcMADS40 is a nucleus-localized transcriptional activator. Plants overexpressing JcMADS40 did not show altered plant growth, but the overexpressing plants did exhibit reductions in grain size, grain length, grain width, 1000-seed weight and yield per plant. Further data on the reduced grain size in JcMADS40-overexpressing plants supported the putative role of JcMADS genes in seed development. CONCLUSIONS:This study will be useful in order to further understand the process of MADS-box genes involved in regulating growth and development in addition to their functions in abiotic stress resistance, and will eventually provide a theoretical basis for the functional investigation and the exploitation of candidate genes for the molecular improvement of physic nut.

SUBMITTER: Tang Y

PROVIDER: S-EPMC7187513 | biostudies-literature | 2020 Apr

REPOSITORIES: biostudies-literature

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Genome-wide analysis of Jatropha curcas MADS-box gene family and functional characterization of the JcMADS40 gene in transgenic rice.

Tang Yuehui Y Wang Jian J Bao Xinxin X Wu Qian Q Yang Tongwen T Li Han H Wang Wenxia W Zhang Yizhen Y Bai Nannan N Guan Yaxin Y Dai Jiaxi J Xie Yanjie Y Li Shen S Huo Rui R Cheng Wei W

BMC genomics 20200428 1

<h4>Background</h4>Physic nut (Jatropha curcas), an inedible oilseed plant, is among the most promising alternative energy sources because of its high oil content, rapid growth and extensive adaptability. Proteins encoded by MADS-box family genes are important transcription factors participated in regulating plant growth, seed development and responses to abiotic stress. However, there has been no in-depth research on the MADS-box genes and their roles in physic nut.<h4>Results</h4>In our study, ...[more]

PMID: 32345214

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Project description:BackgroundThe MYB family is one of the most abundant transcription factor families in plants. MYB proteins are involved in plant development, abiotic stress tolerance, hormone signal transduction and disease resistance. Here we perform genome-wide identification of MYB family transcription factors in an energy plant J. curcas, including determining family composition, phylogenetic evolution and functional prediction analysis. In addition, we further elucidate the function of the JcMYB2 gene.MethodsThe phylogenetic trees were constructed by using the neighbor-joining method in MEGA 5.2. The biological functions of some JcMYBs were predicted according to orthology. The full length cDNA of JcMYB2 was cloned by using the RACE method. GUS histochemical staining was used to test the activity of the JcMYB2 promoter. Expression patterns of JcMYB2 were detected by using qPCR Transcriptional activity JcMYB2 were confirmed through yeast one hybrid. Subcellular Localization of JcMYB2 Protein were demonstrated by transient expression in the tobacco leaf. The function of JcMYB2 in salt and freezing tolerance were detected in transgenic plants.ResultsA genome-wide analysis identified 128 MYB genes, including 123 R2R3-MYBs, 4 R1R2R3-MYBs and 1 4R-MYB. All of the R2R3-MYBs are further classified into 19 groups which indicated functional conservation among previously identified groups of R2R3-MYB proteins. Among of these newly identified MYBs, the JcMYB2 belongs to group G11 and its expression is induced obviously by cold, salt and MeJA (Methyl Jasmonate) and slightly by ABA (abscisic acid). JcMYB2 is localized to the nucleus and has transcriptional activity. JcMYB2 overexpressing plants are more tolerant to salt and cold stress than wild type plants. Tissue specific expression profiles showed that the JcMYB2 gene was expressed ubiquitously throughout the plant, with higher expression levels observed in the root.ConclusionA comprehensive genome-wide analysis and phylogenetic relationship of R2R3-MYB subfamily in J. curcas present the global identification and functional prediction of JcR2R3-MYBs. Additionally, JcMYB2 regulates the stress response signaling networks by interacting with MeJA and ABA signaling pathway and functions in the root development of J. curcas.

Project description:BackgroundMADS-box transcription factors, besides being involved in floral organ specification, have also been implicated in several aspects of plant growth and development. In recent years, there have been reports on genomic localization, protein motif structure, phylogenetic relationships, gene structure and expression of the entire MADS-box family in the model plant system, Arabidopsis. Though there have been some studies in rice as well, an analysis of the complete MADS-box family along with a comprehensive expression profiling was still awaited after the completion of rice genome sequencing. Furthermore, owing to the role of MADS-box family in flower development, an analysis involving structure, expression and functional aspects of MADS-box genes in rice and Arabidopsis was required to understand the role of this gene family in reproductive development.ResultsA genome-wide molecular characterization and microarray-based expression profiling of the genes encoding MADS-box transcription factor family in rice is presented. Using a thorough annotation exercise, 75 MADS-box genes have been identified in rice and categorized into MIKCc, MIKC*, Malpha, Mbeta and Mgamma groups based on phylogeny. Chromosomal localization of these genes reveals that 16 MADS-box genes, mostly MIKCc-type, are located within the duplicated segments of the rice genome, whereas most of the M-type genes, 20 in all, seem to have resulted from tandem duplications. Nine members belonging to the Mbeta group, which was considered absent in monocots, have also been identified. The expression profiles of all the MADS-box genes have been analyzed under 11 temporal stages of panicle and seed development, three abiotic stress conditions, along with three stages of vegetative development. Transcripts for 31 genes accumulate preferentially in the reproductive phase, of which, 12 genes are specifically expressed in seeds, and six genes show expression specific to panicle development. Differential expression of seven genes under stress conditions is also evident. An attempt has been made to gain insight into plausible functions of rice MADS-box genes by collating the expression data of functionally validated genes in rice and Arabidopsis.ConclusionOnly a limited number of MADS genes have been functionally validated in rice. A comprehensive annotation and transcriptome profiling undertaken in this investigation adds to our understanding of the involvement of MADS-box family genes during reproductive development and stress in rice and also provides the basis for selection of candidate genes for functional validation studies.

Dataset Information

Genome-wide analysis of Jatropha curcas MADS-box gene family and functional characterization of the JcMADS40 gene in transgenic rice.

Publications

Genome-wide analysis of Jatropha curcas MADS-box gene family and functional characterization of the JcMADS40 gene in transgenic rice.

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