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Darwish H, Al-Osaimi GS, Al Kashgry NAT, Sonbol H, Alayafi AAM, Alabdallah NM, Al-Humaid A, Al-Harbi NA, Al-Qahtani SM, Abbas ZK, Darwish DBE, Ibrahim MFM, Noureldeen A. Evaluating the genotoxicity of salinity stress and secondary products gene manipulation in lime, Citrus aurantifolia, plants. FRONTIERS IN PLANT SCIENCE 2023; 14:1211595. [PMID: 37502705 PMCID: PMC10369181 DOI: 10.3389/fpls.2023.1211595] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Accepted: 06/22/2023] [Indexed: 07/29/2023]
Abstract
Salinity is a significant abiotic stress that has a profound effect on growth, the content of secondary products, and the genotoxicity of cells. Lime, Citrus aurantifolia, is a popular plant belonging to the family Rutaceae. The interest in cultivating this plant is due to the importance of its volatile oil, which is included in many pharmaceutical industries, but C. aurantifolia plants are affected by the NaCl salinity levels. In the present study, a comet assay test has been applied to evaluate the genotoxic impact of salinity at 0, 50, 100, and 200 mM of NaCl on C. aurantifolia tissue-cultured plants. Furthermore, terpene gene expression was investigated using a semi-quantitative real-time polymerase chain reaction. Results from the two analyses revealed that 200 mM of NaCl stress resulted in high levels of severe damage to the C. aurantifolia plants' DNA tail 21.8%, tail length 6.56 µm, and tail moment 3.19 Unit. The relative highest expression of RtHK and TAT genes was 2.08, and 1.693, respectively, when plants were exposed to 200 mM of NaCl, whereas pv4CL2RT expressed 1.50 in plants subjected to 100 mM of NaCl. The accumulation of transcripts for the RTMYB was 0.951 when plants were treated with NaCl at 50 mM, and RtGPPS gene was significantly decreased to 0.446 during saline exposure at 100 mM. We conclude that the comet assay test offers an appropriate tool to detect DNA damage as well as RtHK, TAT, and pv4CL2RT genes having post-transcriptional regulation in C. aurantifolia plant cells under salinity stress. Future studies are needed to assess the application of gene expression and comet assay technologies using another set of genes that show vulnerability to different stresses on lime and other plants.
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Affiliation(s)
- Hadeer Darwish
- Department of Biotechnology, College of Science, Taif University, Taif, Saudi Arabia
- Department of Medicinal and Aromatic Plants, Horticulture Research Institute, Agricultural Research Center, Giza, Egypt
| | - Ghaida S. Al-Osaimi
- Department of Biotechnology, College of Science, Taif University, Taif, Saudi Arabia
| | | | - Hana Sonbol
- Department of Biology, College of Science, Princess Nourah Bint Abdulrahman University, Riyadh, Saudi Arabia
| | - Aisha A. M. Alayafi
- Department of Biological Sciences, Faculty of Science, University of Jeddah, Jeddah, Saudi Arabia
| | - Nadiyah M. Alabdallah
- Department of Biology, College of Science, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia
- Basic and Applied Scientific Research Center, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia
| | - Abdulrahman Al-Humaid
- Plant Production and Protection Department, College of Agriculture and Veterinary Medicine, Qassim University, Buraydah, Saudi Arabia
| | - Nadi Awad Al-Harbi
- Biology Department, University College of Tayma, University of Tabuk, Tabuk, Saudi Arabia
| | | | - Zahid Khorshid Abbas
- Department of Biology, Faculty of Sciences, University of Tabuk, Tabuk, Saudi Arabia
| | - Doaa Bahaa Eldin Darwish
- Department of Biology, Faculty of Sciences, University of Tabuk, Tabuk, Saudi Arabia
- Botany Department, Faculty of Science, Mansoura University, Mansoura, Egypt
| | - Mohamed F. M. Ibrahim
- Department of Agricultural Botany, Faculty of Agriculture, Ain Shams University, Cairo, Egypt
| | - Ahmed Noureldeen
- Department of Biology, College of Science, Taif University, Taif, Saudi Arabia
- Department of Agricultural Zoology, Faculty of Agriculture, Mansoura University, Mansoura, Egypt
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Wang D, Yu C, Zhang J, Peterson T. Excision and reinsertion of Ac macrotransposons in maize. Genetics 2022; 221:iyac067. [PMID: 35471241 PMCID: PMC9339288 DOI: 10.1093/genetics/iyac067] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Accepted: 04/18/2022] [Indexed: 11/13/2022] Open
Abstract
Eukaryotic Macrotransposons (MTns) can be formed by 2 nearby elements flanking a segment of host DNA. The maize Ac transposon can form Ac::MTns, but little is known about Ac::MTn transposition activities. Here, we studied 3 Ac::MTns at the maize p1 locus, each of which is composed of a segment of maize p1 genomic DNA (up to 15 kb) bounded by a fractured Ac element (fAc, 2039 bp), and a full-length Ac element in direct orientation. The resulting Ac::MTns are of 16, 16.5, and 22 kb total length. From these 3 Ac::MTns, we identified 10 independent cases of macrotransposition, and observed similar features of transposition between Ac::MTn and standard Ac/Ds, including characteristic excision footprints and insertion target site duplications. Nine out of the 10 Ac::MTn reinsertion targets were genetically linked to the donor sites, another similarity with Ac/Ds standard transposition. We also identified a MTn-like structure in the maize B73 reference genome and 5 NAM founder lines. The MTn in diverse lines is flanked by target site duplications, confirming the historic occurrence of MTn transposition during genome evolution. Our results show that Ac::MTns are capable of mobilizing segments of DNA long enough to include a typical full-length plant gene and in theory could erode gene colinearity in syntenic regions during plant genome evolution.
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Affiliation(s)
- Dafang Wang
- Division of Math and Sciences, Delta State University, Cleveland, MS 38733-0001, USA
| | - Chuanhe Yu
- The Hormel Institute, University of Minnesota, Austin, MN 55912, USA
| | - Jianbo Zhang
- Department of Horticultural Science, Mountain Horticultural Crops Research and Extension Center, North Carolina State University, Mills River, NC 28759, USA
| | - Thomas Peterson
- Department of Genetics, Development and Cell Biology, Iowa State University, Ames, IA 50011-3260, USA
- Department of Agronomy, Iowa State University, Ames, IA 50011-3260, USA
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Overexpression of a Malus baccata MYB Transcription Factor Gene MbMYB4 Increases Cold and Drought Tolerance in Arabidopsis thaliana. Int J Mol Sci 2022; 23:ijms23031794. [PMID: 35163716 PMCID: PMC8836155 DOI: 10.3390/ijms23031794] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Revised: 02/02/2022] [Accepted: 02/02/2022] [Indexed: 11/17/2022] Open
Abstract
In the natural environment, plants often face unfavorable factors such as drought, cold, and freezing, which affect their growth and yield. The MYB (v-myb avian myeloblastosis viral oncogene homolog) transcription factor family is widely involved in plant responses to biotic and abiotic stresses. In this study, Malus baccata (L.) Borkh was used as the research material, and a gene MbMYB4 of the MYB family was cloned from it. The open reading frame (ORF) of MbMYB4 was found to be 762 bp, encoding 253 amino acids; sequence alignment results and predictions of the protein structure indicated that the MbMYB4 protein contained the conserved MYB domain. Subcellular localization showed that MbMYB4 was localized in the nucleus. In addition, the use of quantitative real-time PCR (qPCR) technology found that the expression of MbMYB4 was enriched in the young leaf and root, and it was highly affected by cold and drought treatments in M. baccata seedlings. When MbMYB4 was introduced into Arabidopsis thaliana, it greatly increased the cold and drought tolerance in the transgenic plant. Under cold and drought stresses, the proline and chlorophyll content, and peroxidase (POD) and catalase (CAT) activities of transgenic A. thaliana increased significantly, and the content of malondialdehyde (MDA) and the relative conductivity decreased significantly, indicating that the plasma membrane damage of transgenic A. thaliana was lesser. Therefore, the overexpression of the MbMYB4 gene in A. thaliana can enhance the tolerance of transgenic plants to cold and drought stresses.
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Zhuang H, Chong SL, Priyanka B, Han X, Lin E, Tong Z, Huang H. Full-length transcriptomic identification of R2R3-MYB family genes related to secondary cell wall development in Cunninghamia lanceolata (Chinese fir). BMC PLANT BIOLOGY 2021; 21:581. [PMID: 34879821 PMCID: PMC8653563 DOI: 10.1186/s12870-021-03322-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Accepted: 11/08/2021] [Indexed: 06/01/2023]
Abstract
BACKGROUND R2R3-MYB is a class of transcription factor crucial in regulating secondary cell wall development during wood formation. The regulation of wood formation in gymnosperm has been understudied due to its large genome size. Using Single-Molecule Real-Time sequencing, we obtained full-length transcriptomic libraries from the developmental stem of Cunninghamia lanceolata, a perennial conifer known as Chinese fir. The R2R3-MYB of C. lanceolata (hereafter named as ClMYB) associated with secondary wall development were identified based on phylogenetic analysis, expression studies and functional study on transgenic line. RESULTS The evolutionary relationship of 52 ClMYBs with those from Arabidopsis thaliana, Eucalyptus grandis, Populus trichocarpa, Oryza sativa, two gymnosperm species, Pinus taeda, and Picea glauca were established by neighbour-joining phylogenetic analysis. A large number of ClMYBs resided in the woody-expanded subgroups that predominated with the members from woody dicots. In contrast, the woody-preferential subgroup strictly carrying the members of woody dicots contained only one candidate. The results suggest that the woody-expanded subgroup emerges before the gymnosperm/angiosperm split, while most of the woody-preferential subgroups are likely lineage-specific to woody dicots. Nine candidates shared the same subgroups with the A. thaliana orthologs, with known function in regulating secondary wall development. Gene expression analysis inferred that ClMYB1/2/3/4/5/26/27/49/51 might participate in secondary wall development, among which ClMYB1/2/5/26/27/49 were significantly upregulated in the highly lignified compression wood region, reinforcing their regulatory role associated with secondary wall development. ClMYB1 was experimentally proven a transcriptional activator that localised in the nucleus. The overexpression of ClMYB1 in Nicotiana benthamiana resulted in an increased lignin deposition in the stems. The members of subgroup S4, ClMYB3/4/5 shared the ERF-associated amphiphilic repression motif with AtMYB4, which is known to repress the metabolism of phenylpropanoid derived compounds. They also carried a core motif specific to gymnosperm lineage, suggesting divergence of the regulatory process compared to the angiosperms. CONCLUSIONS This work will enrich the collection of full-length gymnosperm-specific R2R3-MYBs related to stem development and contribute to understanding their evolutionary relationship with angiosperm species.
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Affiliation(s)
- Hebi Zhuang
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an, Hangzhou, 311300, China
| | - Sun-Li Chong
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an, Hangzhou, 311300, China
| | - Borah Priyanka
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an, Hangzhou, 311300, China
| | - Xiao Han
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an, Hangzhou, 311300, China
| | - Erpei Lin
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an, Hangzhou, 311300, China
| | - Zaikang Tong
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an, Hangzhou, 311300, China
| | - Huahong Huang
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an, Hangzhou, 311300, China.
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Distinct and Overlapping Functions of Miscanthus sinensis MYB Transcription Factors SCM1 and MYB103 in Lignin Biosynthesis. Int J Mol Sci 2021; 22:ijms222212395. [PMID: 34830276 PMCID: PMC8625797 DOI: 10.3390/ijms222212395] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Revised: 11/02/2021] [Accepted: 11/12/2021] [Indexed: 11/16/2022] Open
Abstract
Cell wall recalcitrance is a major constraint for the exploitation of lignocellulosic biomass as a renewable resource for energy and bio-based products. Transcriptional regulators of the lignin biosynthetic pathway represent promising targets for tailoring lignin content and composition in plant secondary cell walls. However, knowledge about the transcriptional regulation of lignin biosynthesis in lignocellulosic feedstocks, such as Miscanthus, is limited. In Miscanthus leaves, MsSCM1 and MsMYB103 are expressed at growth stages associated with lignification. The ectopic expression of MsSCM1 and MsMYB103 in N. benthamiana leaves was sufficient to trigger secondary cell wall deposition with distinct sugar and lignin compositions. Moreover, RNA-seq analysis revealed that the transcriptional responses to MsSCM1 and MsMYB103 overexpression showed an extensive overlap with the response to the NAC master transcription factor MsSND1, but were distinct from each other, underscoring the inherent complexity of secondary cell wall formation. Furthermore, conserved and previously described promoter elements as well as novel and specific motifs could be identified from the target genes of the three transcription factors. Together, MsSCM1 and MsMYB103 represent interesting targets for manipulations of lignin content and composition in Miscanthus towards a tailored biomass.
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Yuan Y, Yang X, Feng M, Ding H, Khan MT, Zhang J, Zhang M. Genome-wide analysis of R2R3-MYB transcription factors family in the autopolyploid Saccharum spontaneum: an exploration of dominance expression and stress response. BMC Genomics 2021; 22:622. [PMID: 34404342 PMCID: PMC8371785 DOI: 10.1186/s12864-021-07689-w] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Accepted: 05/06/2021] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Sugarcane (Saccharum) is the most critical sugar crop worldwide. As one of the most enriched transcription factor families in plants, MYB genes display a great potential to contribute to sugarcane improvement by trait modification. We have identified the sugarcane MYB gene family at a whole-genome level through systematic evolution analyses and expression profiling. R2R3-MYB is a large subfamily involved in many plant-specific processes. RESULTS A total of 202 R2R3-MYB genes (356 alleles) were identified in the polyploid Saccharum spontaneum genomic sequence and classified into 15 subgroups by phylogenetic analysis. The sugarcane MYB family had more members by a comparative analysis in sorghum and significant advantages among most plants, especially grasses. Collinearity analysis revealed that 70% of the SsR2R3-MYB genes had experienced duplication events, logically suggesting the contributors to the MYB gene family expansion. Functional characterization was performed to identify 56 SsR2R3-MYB genes involved in various plant bioprocesses with expression profiling analysis on 60 RNA-seq databases. We identified 22 MYB genes specifically expressed in the stem, of which RT-qPCR validated MYB43, MYB53, MYB65, MYB78, and MYB99. Allelic expression dominance analysis implied the differential expression of alleles might be responsible for the high expression of MYB in the stem. MYB169, MYB181, MYB192 were identified as candidate C4 photosynthetic regulators by C4 expression pattern and robust circadian oscillations. Furthermore, stress expression analysis showed that MYB36, MYB48, MYB54, MYB61 actively responded to drought treatment; 19 and 10 MYB genes were involved in response to the sugarcane pokkah boeng and mosaic disease, respectively. CONCLUSIONS This is the first report on genome-wide analysis of the MYB gene family in sugarcane. SsMYBs probably played an essential role in stem development and the adaptation of various stress conditions. The results will provide detailed insights and rich resources to understand the functional diversity of MYB transcription factors and facilitate the breeding of essential traits in sugarcane.
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Affiliation(s)
- Yuan Yuan
- State Key Laboratory for Conservation and Utilization of Agro Bioresources, Guangxi Key Laboratory for Sugarcane Biology, Guangxi University, Nanning, 530005, China
| | - Xiping Yang
- State Key Laboratory for Conservation and Utilization of Agro Bioresources, Guangxi Key Laboratory for Sugarcane Biology, Guangxi University, Nanning, 530005, China
| | - Mengfan Feng
- State Key Laboratory for Conservation and Utilization of Agro Bioresources, Guangxi Key Laboratory for Sugarcane Biology, Guangxi University, Nanning, 530005, China
| | - Hongyan Ding
- State Key Laboratory for Conservation and Utilization of Agro Bioresources, Guangxi Key Laboratory for Sugarcane Biology, Guangxi University, Nanning, 530005, China
| | | | - Jisen Zhang
- Fujian Agricultural and Forestry University, Fuzhou, 350002, China
| | - Muqing Zhang
- State Key Laboratory for Conservation and Utilization of Agro Bioresources, Guangxi Key Laboratory for Sugarcane Biology, Guangxi University, Nanning, 530005, China.
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Zhang Y, Xu S, Cheng Y, Wang J, Wang X, Liu R, Han J. Functional identification of PsMYB57 involved in anthocyanin regulation of tree peony. BMC Genet 2020; 21:124. [PMID: 33198624 PMCID: PMC7667756 DOI: 10.1186/s12863-020-00930-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2019] [Accepted: 10/30/2020] [Indexed: 01/09/2023] Open
Abstract
BACKGROUND R2R3 myeloblastosis (MYB) genes are widely distributed in plants and comprise one of the largest transcription factor gene families. They play important roles in the regulatory networks controlling development, metabolism, and stress responses. Researches on functional genes in tree peony are still in its infancy. To date, few MYB genes have thus far been reported. RESULTS In this study, we constructed a comprehensive reference gene set by transcriptome sequencing to obtain R2R3 MYB genes. The transcriptomes of eight different tissues were sequenced, and 92,837 unigenes were obtained with an N50 of 1662 nt. A total of 48,435 unigenes (77.98%) were functionally annotated in public databases. Based on the assembly, we identified 57 R2R3 MYB genes containing full-length open reading frames, which clustered into 35 clades by phylogenetic analysis. PsMYB57 clustered with anthocyanin regulation genes in Arabidopsis and was mainly transcribed in the buds and young leaves. The overexpression of PsMYB57 induced anthocyanin accumulation in tobacco, and four detected anthocyanin structural genes, including NtCHS, NtF3'H, NtDFR, and NtANS, were upregulated. The two endogenous bHLH genes NtAn1a and NtAn1b were also upregulated and may work in combination with PsMYB57 in regulating anthocyanin structural genes. CONCLUSIONS Our study offers a useful reference to the selection of candidate MYB genes for further functional studies in tree peony. Function analysis of PsMYB57 is helpful to understand the color accumulation in vegetative organs of tree peony. PsMYB57 is also a promising resource to improve plant color in molecular breeding.
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Affiliation(s)
- Yanzhao Zhang
- Life Science Department, Luoyang Normal University, Luoyang, 471022, China.
| | - Shuzhen Xu
- Life Science Department, Luoyang Normal University, Luoyang, 471022, China
| | - Yanwei Cheng
- Life Science Department, Luoyang Normal University, Luoyang, 471022, China
| | - Jing Wang
- Life Science Department, Luoyang Normal University, Luoyang, 471022, China
| | - Xiangxiang Wang
- Life Science Department, Luoyang Normal University, Luoyang, 471022, China
| | - Runxiao Liu
- Life Science Department, Luoyang Normal University, Luoyang, 471022, China
| | - Jianming Han
- Life Science Department, Luoyang Normal University, Luoyang, 471022, China
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Fan H, Cui M, Li N, Li X, Liang Y, Liu L, Cai Y, Lin Y. Genome-wide identification and expression analyses of R2R3-MYB transcription factor genes from two Orchid species. PeerJ 2020; 8:e9781. [PMID: 32953268 PMCID: PMC7473048 DOI: 10.7717/peerj.9781] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Accepted: 07/30/2020] [Indexed: 11/20/2022] Open
Abstract
MYB transcription factors play important roles in different plant biological processes during plant growth, development and stress response. In this study, 101 (DoMYB1-101) and 99 (PaMYB1-99) R2R3-MYB genes were identified in the genomes of Dendrobium officinale and Phalaenopsis aphrodite, respectively. To classify the isolated candidate genes, the R2R3-MYB genes from A. thaliana were selected as references. As a result, all identified DoMYB and PaMYB genes were classified into 22 subfamilies. Phylogenetic analysis revealed that S21 had the largest number of members of all the subfamilies. The numbers of introns, exons and conserved sequences in all of the identified genes are different. In addition, 20 DoMYB genes from six subfamilies were selected for further analysis of tissue-specific expression and responses to various abiotic stresses treatments. The results showed that all of the DoMYB genes in S4 and S19 subfamilies exhibited the highest relative expression levels in flowers. And five DoMYB genes including DoMYB31, DoMYB40, DoMYB49, DoMYB52 and DoMYB54, responded to the stress response. These results may provide useful information for further studies of the R2R3-MYB gene family.
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Affiliation(s)
- Honghong Fan
- School of Life Sciences, Anhui Agricultural University, Hefei, China
| | - Manli Cui
- School of Life Sciences, Anhui Agricultural University, Hefei, China
| | - Ninghong Li
- School of Life Sciences, Anhui Agricultural University, Hefei, China
| | - Xujuan Li
- School of Life Sciences, Anhui Agricultural University, Hefei, China
| | - Yuxuan Liang
- Faculty of Forestry, University of British Columbia, Vancouver, Canada
| | - Lin Liu
- School of Life Sciences, Anhui Agricultural University, Hefei, China
| | - Yongping Cai
- School of Life Sciences, Anhui Agricultural University, Hefei, China
| | - Yi Lin
- School of Life Sciences, Anhui Agricultural University, Hefei, China
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Erfatpour M, Pauls KP. A R2R3-MYB gene-based marker for the non-darkening seed coat trait in pinto and cranberry beans (Phaseolus vulgaris L.) derived from 'Wit-rood boontje'. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2020; 133:1977-1994. [PMID: 32112124 PMCID: PMC7237406 DOI: 10.1007/s00122-020-03571-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Accepted: 02/21/2020] [Indexed: 05/28/2023]
Abstract
KEY MESSAGE The gene Phvul.010G130600 which codes for a MYB was shown to be tightly associated with seed coat darkening in Phaseolus vulgaris and a single nucleotide deletion in the allele in Wit-rood disrupts a transcription activation region that likely prevents its functioning in this non-darkening genotype. The beige and white background colors of the seed coats of conventional pinto and cranberry beans turn brown through a process known as postharvest darkening (PHD). Seed coat PHD is attributed to proanthocyanidin accumulation and its subsequent oxidation in the seed coat. The J gene is an uncharacterized classical genetic locus known to be responsible for PHD in common bean (P. vulgaris) and individuals that are homozygous for its recessive allele have a non-darkening (ND) seed coat phenotype. A previous study identified a major colorimetrically determined QTL for seed coat color on chromosome 10 that was associated with the ND trait. The objectives of this study were to identify a gene associated with seed coat postharvest darkening in common bean and understand its function in promoting seed coat darkening. Amplicon sequencing of 21 candidate genes underlying the QTL associated with the ND trait revealed a single nucleotide deletion (c.703delG) in the candidate gene Phvul.010G130600 in non-darkening recombinant inbred lines derived from crosses between ND 'Wit-rood boontje' and a regular darkening pinto genotype. In silico analysis indicated that Phvul.010G130600 encodes a protein with strong amino acid sequence identity (70%) with a R2R3-MYB-type transcription factor MtPAR, which has been shown to regulate proanthocyanidin biosynthesis in Medicago truncatula seed coat tissue. The deletion in the 'Wit-rood boontje' allele of Phvul.010G130600 likely causes a translational frame shift that disrupts the function of a transcriptional activation domain contained in the C-terminus of the R2R3-MYB. A gene-based dominant marker was developed for the dominant allele of Phvul.010G130600 which can be used for marker-assisted selection of ND beans.
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Affiliation(s)
- M Erfatpour
- Department of Plant Agriculture, University of Guelph, Guelph, ON, N1G 2W1, Canada
| | - K P Pauls
- Department of Plant Agriculture, University of Guelph, Guelph, ON, N1G 2W1, Canada.
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Cai X, Magwanga RO, Xu Y, Zhou Z, Wang X, Hou Y, Wang Y, Zhang Y, Liu F, Wang K. Comparative transcriptome, physiological and biochemical analyses reveal response mechanism mediated by CBF4 and ICE2 in enhancing cold stress tolerance in Gossypium thurberi. AOB PLANTS 2019; 11:plz045. [PMID: 31777648 PMCID: PMC6863471 DOI: 10.1093/aobpla/plz045] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Accepted: 07/10/2019] [Indexed: 05/04/2023]
Abstract
Low temperature is one of the key environmental stresses that impair plant growth and significantly restricts the productivity and spatial distribution of crop plants. Gossypium thurberi, a wild diploid cotton species, has adapted to a wide range of temperatures and exhibits a better tolerance to chilling stress. Here, we compared phenotypes and physiochemical changes in G. thurberi under cold stress and found this species indeed showed better cold tolerance. Therefore, to understand the molecular mechanisms of the cold tolerance in G. thurberi, we compared transcription changes in leaves of G. thurberi under cold stress by high-throughput transcriptome sequencing. In total, 35 617 unigenes were identified in the whole-genome transcription profile, and 4226 differentially expressed genes (DEGs) were discovered in the leaves upon cold treatment. Gene Ontology (GO) classification analyses showed that the majority of DEGs belonged to categories of signal transduction, transcription factors (TFs) and carbohydrate transport and metabolism. The expression of several cold-responsive genes such as ICE1, CBF4, RAP2-7 and abscisic acid (ABA) biosynthesis genes involved in different signalling pathways were induced after G. thurberi seedlings were exposed to cold stress. Furthermore, cold sensitivity was increased in CBF4 and ICE2 virus-induced gene silencing (VIGS) plants, and high level of malondialdehyde (MDA) showed that the CBF4 and ICE2 silenced plants were under oxidative stress compared to their wild types, which relatively had higher levels of antioxidant enzyme activity, as evident by high levels of proline and superoxide dismutase (SOD) content. In conclusion, our findings reveal a new regulatory network of cold stress response in G. thurberi and broaden our understanding of the cold tolerance mechanism in cotton, which might accelerate functional genomics studies and genetic improvement for cold stress tolerance in cultivated cotton.
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Affiliation(s)
- Xiaoyan Cai
- State Key Laboratory of Cotton Biology /Institute of Cotton Research, Chinese Academy of Agricultural Science, Anyang, Henan, China
- College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Richard Odongo Magwanga
- State Key Laboratory of Cotton Biology /Institute of Cotton Research, Chinese Academy of Agricultural Science, Anyang, Henan, China
- School of Biological and Physical Sciences (SBPS), Jaramogi Oginga Odinga University of Science and Technology (JOOUST), Bondo, Kenya
| | - Yanchao Xu
- State Key Laboratory of Cotton Biology /Institute of Cotton Research, Chinese Academy of Agricultural Science, Anyang, Henan, China
| | - Zhongli Zhou
- State Key Laboratory of Cotton Biology /Institute of Cotton Research, Chinese Academy of Agricultural Science, Anyang, Henan, China
| | - Xingxing Wang
- State Key Laboratory of Cotton Biology /Institute of Cotton Research, Chinese Academy of Agricultural Science, Anyang, Henan, China
| | - Yuqing Hou
- State Key Laboratory of Cotton Biology /Institute of Cotton Research, Chinese Academy of Agricultural Science, Anyang, Henan, China
| | - Yuhong Wang
- State Key Laboratory of Cotton Biology /Institute of Cotton Research, Chinese Academy of Agricultural Science, Anyang, Henan, China
| | - Yuanming Zhang
- College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Fang Liu
- State Key Laboratory of Cotton Biology /Institute of Cotton Research, Chinese Academy of Agricultural Science, Anyang, Henan, China
| | - Kunbo Wang
- State Key Laboratory of Cotton Biology /Institute of Cotton Research, Chinese Academy of Agricultural Science, Anyang, Henan, China
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Zhu Z, Li G, Liu L, Zhang Q, Han Z, Chen X, Li B. A R2R3-MYB Transcription Factor, VvMYBC2L2, Functions as a Transcriptional Repressor of Anthocyanin Biosynthesis in Grapevine (Vitis vinifera L.). Molecules 2018; 24:E92. [PMID: 30591695 PMCID: PMC6337365 DOI: 10.3390/molecules24010092] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Revised: 12/26/2018] [Accepted: 12/27/2018] [Indexed: 12/18/2022] Open
Abstract
In grapevine, the MYB transcription factors play an important role in the flavonoid pathway. Here, a R2R3-MYB transcription factor, VvMYBC2L2, isolated from Vitis vinifera cultivar Yatomi Rose, may be involved in anthocyanin biosynthesis as a transcriptional repressor. VvMYBC2L2 was shown to be a nuclear protein. The gene was shown to be strongly expressed in root, flower and seed tissue, but weakly expressed during the fruit development in grapevine. Overexpressing the VvMYBC2L2 gene in tobacco resulted in a very marked decrease in petal anthocyanin concentration. Expression analysis of flavonoid biosynthesis structural genes revealed that chalcone synthase (CHS), dihydroflavonol 4-reductase (DFR), leucoanthocyanidin reductase (LAR) and UDP glucose flavonoid 3-O-glucosyl transferase (UFGT) were strongly down-regulated in the VvMYBC2L2-overexpressed tobacco. In addition, transcription of the regulatory genes AN1a and AN1b was completely suppressed in transgenic plants. These results suggested that VvMYBC2L2 plays a role as a negative regulator of anthocyanin biosynthesis.
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Affiliation(s)
- Ziguo Zhu
- Shandong Institute of Pomology, Shandong Academy of Agricultural Science, No 66 Longtan Road, Taian 271000, Shandong, China.
| | - Guirong Li
- College of Horticulture and Landscape Architecture, Henan Institute of Science and Technology, Xinxiang 453003, Henan, China.
| | - Li Liu
- Shandong Institute of Pomology, Shandong Academy of Agricultural Science, No 66 Longtan Road, Taian 271000, Shandong, China.
| | - Qingtian Zhang
- Shandong Institute of Pomology, Shandong Academy of Agricultural Science, No 66 Longtan Road, Taian 271000, Shandong, China.
| | - Zhen Han
- Shandong Institute of Pomology, Shandong Academy of Agricultural Science, No 66 Longtan Road, Taian 271000, Shandong, China.
| | - Xuesen Chen
- College of Horticulture Science and Engineering, Shandong Agriculture University, No 61 Daizong Road, Taian 271000, Shandong, China.
| | - Bo Li
- Shandong Institute of Pomology, Shandong Academy of Agricultural Science, No 66 Longtan Road, Taian 271000, Shandong, China.
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12
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Gao R, Gruber MY, Amyot L, Hannoufa A. SPL13 regulates shoot branching and flowering time in Medicago sativa. PLANT MOLECULAR BIOLOGY 2018; 96:119-133. [PMID: 29149417 DOI: 10.1007/s11103-017-0683-8] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Accepted: 11/10/2017] [Indexed: 05/20/2023]
Abstract
Our results show SPL13 plays a crucial role in regulating vegetative and reproductive development in Medicago sativa L. (alfalfa), and that MYB112 is targeted and downregulated by SPL13 in alfalfa. We previously showed that transgenic Medicago sativa (alfalfa) plants overexpressing microRNA156 (miR156) show a bushy phenotype, reduced internodal length, delayed flowering time, and enhanced biomass yield. In alfalfa, transcripts of seven SQUAMOSA-PROMOTER BINDING PROTEIN-LIKE (SPL) transcription factors, including SPL13, are targeted for cleavage by miR156. Thus, association of each target SPL gene to a trait or set of traits is essential for developing molecular markers for alfalfa breeding. In this study, we investigated SPL13 function using SPL13 overexpression and silenced alfalfa plants. Severe growth retardation, distorted branches and up-curled leaves were observed in miR156-impervious 35S::SPL13m over-expression plants. In contrast, more lateral branches and delayed flowering time were observed in SPL13 silenced plants. SPL13 transcripts were predominantly present in the plant meristems, indicating that SPL13 is involved in regulating shoot branch development. Accordingly, the shoot branching-related CAROTENOID CLEAVAGE DIOXYGENASE 8 gene was found to be significantly downregulated in SPL13 RNAi silencing plants. A R2R3-MYB gene MYB112 was also identified as being directly silenced by SPL13 based on Next Generation Sequencing-mediated transcriptome analysis and chromatin immunoprecipitation assays, suggesting that MYB112 may be involved in regulating alfalfa vegetative growth.
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Affiliation(s)
- Ruimin Gao
- Agriculture and Agri-Food Canada, 1391 Sandford Street, London, ON, N5V 4T3, Canada
| | - Margaret Y Gruber
- Agriculture and Agri-Food Canada, 107 Science Place, Saskatoon, SK, S7N 0X2, Canada
| | - Lisa Amyot
- Agriculture and Agri-Food Canada, 1391 Sandford Street, London, ON, N5V 4T3, Canada
| | - Abdelali Hannoufa
- Agriculture and Agri-Food Canada, 1391 Sandford Street, London, ON, N5V 4T3, Canada.
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Rao X, Dixon RA. Current Models for Transcriptional Regulation of Secondary Cell Wall Biosynthesis in Grasses. FRONTIERS IN PLANT SCIENCE 2018; 9:399. [PMID: 29670638 PMCID: PMC5893761 DOI: 10.3389/fpls.2018.00399] [Citation(s) in RCA: 83] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2017] [Accepted: 03/13/2018] [Indexed: 05/17/2023]
Abstract
Secondary cell walls mediate many crucial biological processes in plants including mechanical support, water and nutrient transport and stress management. They also provide an abundant resource of renewable feed, fiber, and fuel. The grass family contains the most important food, forage, and biofuel crops. Understanding the regulatory mechanism of secondary wall formation in grasses is necessary for exploiting these plants for agriculture and industry. Previous research has established a detailed model of the secondary wall regulatory network in the dicot model species Arabidopsis thaliana. Grasses, branching off from the dicot ancestor 140-150 million years ago, display distinct cell wall morphology and composition, suggesting potential for a different secondary wall regulation program from that established for dicots. Recently, combined application of molecular, genetic and bioinformatics approaches have revealed more transcription factors involved in secondary cell wall biosynthesis in grasses. Compared with the dicots, grasses exhibit a relatively conserved but nevertheless divergent transcriptional regulatory program to activate their secondary cell wall development and to coordinate secondary wall biosynthesis with other physiological processes.
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Affiliation(s)
- Xiaolan Rao
- BioDiscovery Institute and Department of Biological Sciences, University of North Texas, Denton, TX, United States
- BioEnergy Science Center, United States Department of Energy, Oak Ridge, TN, United States
- *Correspondence: Xiaolan Rao,
| | - Richard A. Dixon
- BioDiscovery Institute and Department of Biological Sciences, University of North Texas, Denton, TX, United States
- BioEnergy Science Center, United States Department of Energy, Oak Ridge, TN, United States
- Center for Bioenergy Innovation, United States Department of Energy, Oak Ridge, TN, United States
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Identification and Characterization of the Diverse Stress-Responsive R2R3-RMYB Transcription Factor from Hibiscus sabdariffa L. Int J Genomics 2017; 2017:2763259. [PMID: 29181384 PMCID: PMC5664376 DOI: 10.1155/2017/2763259] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Revised: 08/11/2017] [Accepted: 09/06/2017] [Indexed: 12/12/2022] Open
Abstract
Various regulatory proteins play a fundamental role to manage the healthy plant growth under stress conditions. Differential display reverse transcriptase PCR and random amplification of cDNA ends (RACE) was used to explore the osmotic stress-responsive transcripts. We identified and characterized the salt stress-responsive R2R3 type RMYB transcription factor from Hibiscus sabdariffa which has an open reading frame of 690 bp, encoding 229 long chain amino acids. In silico analysis confirmed the conserved R2 and R3 domain as well as an NLS-1 localization site. The deduced amino acids of RMYB shared 83, 81, 80, 79, 72, 71, and 66% homology with Arabidopsis thaliana, Glycine max, Oryza sativa, Zea maize, Malus domestica, Populus tremula × Populus alba, and Medicago sativa specific MYB family, respectively. We observed the gene upregulation in stem, leaf, and root tissue in response to abiotic stress. Furthermore, RMYB gene was cloned into plant expression vector under CaMV35S promoter and transformed to Gossypium hirsutum: a local cotton cultivar. Overexpression of RMYB was observed in transgenic plants under abiotic stresses which further suggests its regulatory role in response to stressful conditions. The RMYB transcription factor-overexpressing in transgenic cotton plants may be used as potential agent for the development of stress tolerant crop cultivars.
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Ding K, Pei T, Bai Z, Jia Y, Ma P, Liang Z. SmMYB36, a Novel R2R3-MYB Transcription Factor, Enhances Tanshinone Accumulation and Decreases Phenolic Acid Content in Salvia miltiorrhiza Hairy Roots. Sci Rep 2017; 7:5104. [PMID: 28698552 PMCID: PMC5506036 DOI: 10.1038/s41598-017-04909-w] [Citation(s) in RCA: 75] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Accepted: 05/22/2017] [Indexed: 11/08/2022] Open
Abstract
Phenolic acids and tanshinones are two major bioactive components in Salvia miltiorrhiza Bunge. A novel endogenous R2R3-MYB transcription factor, SmMYB36, was identified in this research. This transcript factor can simultaneously influence the content of two types of components in SmMYB36 overexpression hairy roots. SmMYB36 was mainly localized in the nucleus of onion epidermis and it has transactivation activity. The overexpression of SmMYB36 promoted tanshinone accumulation but inhibited phenolic acid and flavonoid biosynthesis in Salvia miltiorrhiza hairy roots. The altered metabolite content was due to changed metabolic flow which was regulated by transcript expression of metabolic pathway genes. The gene transcription levels of the phenylpropanoid general pathway, tyrosine derived pathway, methylerythritol phosphate pathway and downstream tanshinone biosynthetic pathway changed significantly due to the overexpression of SmMYB36. The wide distribution of MYB binding elements (MBS, MRE, MBSI and MBSII) and electrophoretic mobility shift assay results indicated that SmMYB36 may be an effective tool to regulate metabolic flux shifts.
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Affiliation(s)
- Kai Ding
- College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, China
| | - Tianlin Pei
- College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, China
| | - Zhengqing Bai
- College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, China
| | - Yanyan Jia
- College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, China
| | - Pengda Ma
- College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, China.
| | - Zongsuo Liang
- College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, China.
- College of Life Sciences, Zhejiang Sci-Tech University, Hangzhou, Zhejiang, China.
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Liu X, Yu W, Zhang X, Wang G, Cao F, Cheng H. Identification and expression analysis under abiotic stress of the R2R3- MYB genes in Ginkgo biloba L. PHYSIOLOGY AND MOLECULAR BIOLOGY OF PLANTS : AN INTERNATIONAL JOURNAL OF FUNCTIONAL PLANT BIOLOGY 2017; 23:503-516. [PMID: 28878490 PMCID: PMC5567697 DOI: 10.1007/s12298-017-0436-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2016] [Revised: 03/11/2017] [Accepted: 03/20/2017] [Indexed: 05/25/2023]
Abstract
The R2R3-MYB gene family is the largest MYB subfamily in plants and is involved in the regulation of plant secondary metabolism and specific morphogenesis, as well as the response to biotic and abiotic stress. However, a systematic identification and characterization of this gene family has not been carried out in Ginkgo biloba. In this study, we performed a transcriptome-wide survey from four tissues of G. biloba to determine the genetic variation and expression pattern of the R2R3-MYB genes. We analyzed 45 GbMYBs and identified 42 with a complete coding sequence via conserved motif searches. The MYB domain and other motifs in GbMYBs are highly conserved with Arabidopsis thaliana AtMYBs. Phylogenetic analysis of the GbMYBs and AtMYBs categorized the R2R3-MYBs into 26 subgroups, of which 11 subgroups included proteins from both G. biloba and Arabidopsis, and 1 subgroup was specific to G. biloba. Moreover, the GbMYBs expression patterns were analyzed in different tissues and abiotic stress conditions. The results revealed that GbMYBs were differentially expressed in various tissues and following abiotic stresses and phytohormone treatments, indicating their possible roles in biological processes and abiotic stress tolerance and adaptation. Our study demonstrated the functional diversity of the GbMYBs and will provide a foundation for future research into their biological and molecular functions.
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Affiliation(s)
- Xinliang Liu
- Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037 China
- Jiangxi Academy of Forestry, Nanchang, 330032 China
| | - Wanwen Yu
- Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037 China
- The Jiangsu Provincial Platform for Conservation and Utilization of Agricultural Germplasm, Nanjing, 210037 China
| | - Xuhui Zhang
- Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037 China
| | - Guibin Wang
- Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037 China
| | - Fuliang Cao
- Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037 China
| | - Hua Cheng
- Economic Forest Germplasm Improvement and Comprehensive Utilization of Resources of Hubei Key Laboratories, Huanggang Normal University, Huanggang, 438000 China
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Liu C, Xie T, Chen C, Luan A, Long J, Li C, Ding Y, He Y. Genome-wide organization and expression profiling of the R2R3-MYB transcription factor family in pineapple (Ananas comosus). BMC Genomics 2017; 18:503. [PMID: 28668094 PMCID: PMC5494133 DOI: 10.1186/s12864-017-3896-y] [Citation(s) in RCA: 69] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Accepted: 06/22/2017] [Indexed: 01/01/2023] Open
Abstract
Background The MYB proteins comprise one of the largest families of plant transcription factors, which are involved in various plant physiological and biochemical processes. Pineapple (Ananas comosus) is one of three most important tropical fruits worldwide. The completion of pineapple genome sequencing provides a great opportunity to investigate the organization and evolutionary traits of pineapple MYB genes at the genome-wide level. Results In the present study, a total of 94 pineapple R2R3-MYB genes were identified and further phylogenetically classified into 26 subfamilies, as supported by the conserved gene structures and motif composition. Collinearity analysis indicated that the segmental duplication events played a crucial role in the expansion of pineapple MYB gene family. Further comparative phylogenetic analysis suggested that there have been functional divergences of MYB gene family during plant evolution. RNA-seq data from different tissues and developmental stages revealed distinct temporal and spatial expression profiles of the AcMYB genes. Further quantitative expression analysis showed the specific expression patterns of the selected putative stress-related AcMYB genes in response to distinct abiotic stress and hormonal treatments. The comprehensive expression analysis of the pineapple MYB genes, especially the tissue-preferential and stress-responsive genes, could provide valuable clues for further function characterization. Conclusions In this work, we systematically identified AcMYB genes by analyzing the pineapple genome sequence using a set of bioinformatics approaches. Our findings provide a global insight into the organization, phylogeny and expression patterns of the pineapple R2R3-MYB genes, and hence contribute to the greater understanding of their biological roles in pineapple. Electronic supplementary material The online version of this article (doi:10.1186/s12864-017-3896-y) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Chaoyang Liu
- College of Horticulture, South China Agricultural University, Guangzhou, 510642, Guangdong, China
| | - Tao Xie
- College of Horticulture, South China Agricultural University, Guangzhou, 510642, Guangdong, China
| | - Chenjie Chen
- College of Horticulture, South China Agricultural University, Guangzhou, 510642, Guangdong, China
| | - Aiping Luan
- College of Horticulture, South China Agricultural University, Guangzhou, 510642, Guangdong, China
| | - Jianmei Long
- Key Laboratory of Horticultural Plant Biology of MOE (Ministry of Education), Huazhong Agricultural University, Wuhan, 430070, Hubei, China
| | - Chuhao Li
- College of Horticulture, South China Agricultural University, Guangzhou, 510642, Guangdong, China
| | - Yaqi Ding
- College of Horticulture, South China Agricultural University, Guangzhou, 510642, Guangdong, China
| | - Yehua He
- College of Horticulture, South China Agricultural University, Guangzhou, 510642, Guangdong, China.
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Lei YX, Zhang Y, Li YY, Lai JJ, Gao G, Zhang HQ, Zhou YH, Yang RW. Cloning and molecular characterization of Myb transcription factors from Leymus (Poaceae: Trticeae). Biologia (Bratisl) 2016. [DOI: 10.1515/biolog-2016-0134] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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19
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Wong DCJ, Schlechter R, Vannozzi A, Höll J, Hmmam I, Bogs J, Tornielli GB, Castellarin SD, Matus JT. A systems-oriented analysis of the grapevine R2R3-MYB transcription factor family uncovers new insights into the regulation of stilbene accumulation. DNA Res 2016; 23:451-466. [PMID: 27407139 PMCID: PMC5066171 DOI: 10.1093/dnares/dsw028] [Citation(s) in RCA: 89] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Accepted: 05/17/2016] [Indexed: 01/12/2023] Open
Abstract
R2R3-MYB transcription factors (TFs) belong to a large and functionally diverse protein superfamily in plants. In this study, we explore the evolution and function of this family in grapevine (Vitis vinifera L.), a high-value fruit crop. We identified and manually curated 134 genes using RNA-Seq data, and named them systematically according to the Super-Nomenclature Committee. We identified novel genes, splicing variants and grapevine/woody-specific duplicated subgroups, suggesting possible neo- and sub-functionalization events. Regulatory network analysis ascribed biological functions to uncharacterized genes and validated those of known genes (e.g. secondary cell wall biogenesis and flavonoid biosynthesis). A comprehensive analysis of different MYB binding motifs in the promoters of co-expressed genes predicted grape R2R3-MYB binding preferences and supported evidence for putative downstream targets. Enrichment of cis-regulatory motifs for diverse TFs reinforced the notion of transcriptional coordination and interaction between MYBs and other regulators. Analysis of the network of Subgroup 2 showed that the resveratrol-related VviMYB14 and VviMYB15 share common co-expressed STILBENE SYNTHASE genes with the uncharacterized VviMYB13. These regulators have distinct expression patterns within organs and in response to biotic and abiotic stresses, suggesting a pivotal role of VviMYB13 in regulating stilbene accumulation in vegetative tissues and under biotic stress conditions.
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Affiliation(s)
| | | | - Alessandro Vannozzi
- Department of Agronomy, Food, Natural Resources, Animals, and Environment, University of Padova, 35020 Legnaro, Padova, Italy
| | - Janine Höll
- Centre for Organismal Studies Heidelberg, University of Heidelberg, 69120 Heidelberg, Germany
| | - Ibrahim Hmmam
- Department of Agronomy, Food, Natural Resources, Animals, and Environment, University of Padova, 35020 Legnaro, Padova, Italy
| | - Jochen Bogs
- Dienstleistungszentrum Laendlicher Raum Rheinpfalz, Breitenweg 71, Viticulture and Enology Group, 67435 Neustadt/W, Germany.,Fachhochschule Bingen, Berlinstr. 109, 55411 Bingen am Rhein, Germany
| | | | | | - José Tomás Matus
- Center for Research in Agricultural Genomics CSIC-IRTA-UAB-UB, Barcelona 08193, Spain
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Identification and Characterization of 40 Isolated Rehmannia glutinosa MYB Family Genes and Their Expression Profiles in Response to Shading and Continuous Cropping. Int J Mol Sci 2015; 16:15009-30. [PMID: 26147429 PMCID: PMC4519885 DOI: 10.3390/ijms160715009] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Revised: 06/18/2015] [Accepted: 06/23/2015] [Indexed: 12/15/2022] Open
Abstract
The v-myb avian myeloblastosis viral oncogene homolog (MYB) superfamily constitutes one of the most abundant groups of transcription factors (TFs) described in plants. To date, little is known about the MYB genes in Rehmannia glutinosa. Forty unique MYB genes with full-length cDNA sequences were isolated. These 40 genes were grouped into five categories, one R1R2R3-MYB, four TRFL MYBs, four SMH MYBs, 25 R2R3-MYBs, and six MYB-related members. The MYB DNA-binding domain (DBD) sequence composition was conserved among proteins of the same subgroup. As expected, most of the closely related members in the phylogenetic tree exhibited common motifs. Additionally, the gene structure and motifs of the R. glutinosa MYB genes were analyzed. MYB gene expression was analyzed in the leaf and the tuberous root under two abiotic stress conditions. Expression profiles showed that most R. glutinosa MYB genes were expressed in the leaf and the tuberous root, suggesting that MYB genes are involved in various physiological and developmental processes in R. glutinosa. Seven MYB genes were up-regulated in response to shading in at least one tissue. Two MYB genes showed increased expression and 13 MYB genes showed decreased expression in the tuberous root under continuous cropping. This investigation is the first comprehensive study of the MYB gene family in R. glutinosa.
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The Evolutionary History of R2R3-MYB Proteins Across 50 Eukaryotes: New Insights Into Subfamily Classification and Expansion. Sci Rep 2015; 5:11037. [PMID: 26047035 PMCID: PMC4603784 DOI: 10.1038/srep11037] [Citation(s) in RCA: 74] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Accepted: 04/28/2015] [Indexed: 01/21/2023] Open
Abstract
R2R3-MYB proteins (2R-MYBs) are one of the main transcription factor families in higher plants. Since the evolutionary history of this gene family across the eukaryotic kingdom remains unknown, we performed a comparative analysis of 2R-MYBs from 50 major eukaryotic lineages, with particular emphasis on land plants. A total of 1548 candidates were identified among diverse taxonomic groups, which allowed for an updated classification of 73 highly conserved subfamilies, including many newly identified subfamilies. Our results revealed that the protein architectures, intron patterns, and sequence characteristics were remarkably conserved in each subfamily. At least four subfamilies were derived from early land plants, 10 evolved from spermatophytes, and 19 from angiosperms, demonstrating the diversity and preferential expansion of this gene family in land plants. Moreover, we determined that their remarkable expansion was mainly attributed to whole genome and segmental duplication, where duplicates were preferentially retained within certain subfamilies that shared three homologous intron patterns (a, b, and c) even though up to 12 types of patterns existed. Through our integrated distributions, sequence characteristics, and phylogenetic tree analyses, we confirm that 2R-MYBs are old and postulate that 3R-MYBs may be evolutionarily derived from 2R-MYBs via intragenic domain duplication.
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Soler M, Camargo ELO, Carocha V, Cassan-Wang H, San Clemente H, Savelli B, Hefer CA, Paiva JAP, Myburg AA, Grima-Pettenati J. The Eucalyptus grandis R2R3-MYB transcription factor family: evidence for woody growth-related evolution and function. THE NEW PHYTOLOGIST 2015; 206:1364-77. [PMID: 25250741 DOI: 10.1111/nph.13039] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2014] [Accepted: 08/05/2014] [Indexed: 05/19/2023]
Abstract
The R2R3-MYB family, one of the largest transcription factor families in higher plants, controls a wide variety of plant-specific processes including, notably, phenylpropanoid metabolism and secondary cell wall formation. We performed a genome-wide analysis of this superfamily in Eucalyptus, one of the most planted hardwood trees world-wide. A total of 141 predicted R2R3-MYB sequences identified in the Eucalyptus grandis genome sequence were subjected to comparative phylogenetic analyses with Arabidopsis thaliana, Oryza sativa, Populus trichocarpa and Vitis vinifera. We analysed features such as gene structure, conserved motifs and genome location. Transcript abundance patterns were assessed by RNAseq and validated by high-throughput quantitative PCR. We found some R2R3-MYB subgroups with expanded membership in E. grandis, V. vinifera and P. trichocarpa, and others preferentially found in woody species, suggesting diversification of specific functions in woody plants. By contrast, subgroups containing key genes regulating lignin biosynthesis and secondary cell wall formation are more conserved across all of the species analysed. In Eucalyptus, R2R3-MYB tandem gene duplications seem to disproportionately affect woody-preferential and woody-expanded subgroups. Interestingly, some of the genes belonging to woody-preferential subgroups show higher expression in the cambial region, suggesting a putative role in the regulation of secondary growth.
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Affiliation(s)
- Marçal Soler
- LRSV Laboratoire de Recherche en Sciences Végétales, UMR5546, Université Toulouse III/CNRS, BP 42617 Auzeville, 31326, Castanet Tolosan, France
| | - Eduardo Leal Oliveira Camargo
- LRSV Laboratoire de Recherche en Sciences Végétales, UMR5546, Université Toulouse III/CNRS, BP 42617 Auzeville, 31326, Castanet Tolosan, France
| | - Victor Carocha
- LRSV Laboratoire de Recherche en Sciences Végétales, UMR5546, Université Toulouse III/CNRS, BP 42617 Auzeville, 31326, Castanet Tolosan, France
- Instituto de Tecnologia Química e Biológica (ITQB), Universidade Nova de Lisboa, Av. da República, 2780-157, Oeiras, Portugal
- Instituto de Biologia Experimental e Tecnológica (iBET) Av. da República, Quinta do Marquês, 2781-901, Oeiras, Portugal
| | - Hua Cassan-Wang
- LRSV Laboratoire de Recherche en Sciences Végétales, UMR5546, Université Toulouse III/CNRS, BP 42617 Auzeville, 31326, Castanet Tolosan, France
| | - Hélène San Clemente
- LRSV Laboratoire de Recherche en Sciences Végétales, UMR5546, Université Toulouse III/CNRS, BP 42617 Auzeville, 31326, Castanet Tolosan, France
| | - Bruno Savelli
- LRSV Laboratoire de Recherche en Sciences Végétales, UMR5546, Université Toulouse III/CNRS, BP 42617 Auzeville, 31326, Castanet Tolosan, France
| | - Charles A Hefer
- Bioinformatics and Computational Biology Unit, Department of Biochemistry, Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Private Bag X20, Pretoria, 0028, South Africa
| | - Jorge A Pinto Paiva
- Instituto de Biologia Experimental e Tecnológica (iBET) Av. da República, Quinta do Marquês, 2781-901, Oeiras, Portugal
- Instituto de Investigaçao Científica e Tropical (IICT/MNE) Palacio Burnay - Rua da Junqueira, 30, 1349-007, Lisboa, Portugal
| | - Alexander A Myburg
- Department of Genetics, Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Private Bag X20, Pretoria, 0028, South Africa
- Genomics Research Institute (GRI), University of Pretoria, Private Bag X20, Pretoria, 0028, South Africa
| | - Jacqueline Grima-Pettenati
- LRSV Laboratoire de Recherche en Sciences Végétales, UMR5546, Université Toulouse III/CNRS, BP 42617 Auzeville, 31326, Castanet Tolosan, France
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She W, Zhu S, Jie Y, Xing H, Cui G. Expression profiling of cadmium response genes in ramie (Boehmeria nivea L.) root. BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2015; 94:453-9. [PMID: 25724673 DOI: 10.1007/s00128-015-1502-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2014] [Accepted: 02/11/2015] [Indexed: 05/25/2023]
Abstract
Ramie (Boehmeria nivea), a perennial herb belongs to Urticaceae family, is a rapid growth and high biomass crop with highly tolerant and accumulative to heavy metals. However, the gene expression and regulation caused by cadmium (Cd) in ramie has not been well studied. In the present study, a gene expression database of ramie root in the absence (control) or presence of 100 μM Cd was established. Solexa high-throughput sequencing technology showed that 3,654,395 and 3,572,333 tags have been obtained from control and Cd treatment respectively. In total, 3887 genes were detected with significant differential expression levels, in which 2883 genes were up-regulated and 1004 genes were down-regulated. Gene ontology and pathway-based analyses were performed to determine and further to understand the biological functions of those differentially expressed genes. Fifteen genes were selected and their expression levels were confirmed by quantitative RT-PCR, and twelve of them showed consistent expression patterns with the digital gene expression data. Results on these expression profiling of genes lay the basis for biotechnological modification of new transgenic plants with improved phytoremediation capacity.
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Affiliation(s)
- Wei She
- Ramie Research Institute, Hunan Agricultural University, Changsha, 410128, Hunan, China
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Cavallini E, Matus JT, Finezzo L, Zenoni S, Loyola R, Guzzo F, Schlechter R, Ageorges A, Arce-Johnson P, Tornielli GB. The phenylpropanoid pathway is controlled at different branches by a set of R2R3-MYB C2 repressors in grapevine. PLANT PHYSIOLOGY 2015; 167:1448-70. [PMID: 25659381 PMCID: PMC4378173 DOI: 10.1104/pp.114.256172] [Citation(s) in RCA: 176] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Accepted: 02/04/2015] [Indexed: 05/18/2023]
Abstract
Because of the vast range of functions that phenylpropanoids possess, their synthesis requires precise spatiotemporal coordination throughout plant development and in response to the environment. The accumulation of these secondary metabolites is transcriptionally controlled by positive and negative regulators from the MYB and basic helix-loop-helix protein families. We characterized four grapevine (Vitis vinifera) R2R3-MYB proteins from the C2 repressor motif clade, all of which harbor the ethylene response factor-associated amphiphilic repression domain but differ in the presence of an additional TLLLFR repression motif found in the strong flavonoid repressor Arabidopsis (Arabidopsis thaliana) AtMYBL2. Constitutive expression of VvMYB4a and VvMYB4b in petunia (Petunia hybrida) repressed general phenylpropanoid biosynthetic genes and selectively reduced the amount of small-weight phenolic compounds. Conversely, transgenic petunia lines expressing VvMYBC2-L1 and VvMYBC2-L3 showed a severe reduction in petal anthocyanins and seed proanthocyanidins together with a higher pH of crude petal extracts. The distinct function of these regulators was further confirmed by transient expression in tobacco (Nicotiana benthamiana) leaves and grapevine plantlets. Finally, VvMYBC2-L3 was ectopically expressed in grapevine hairy roots, showing a reduction in proanthocyanidin content together with the down-regulation of structural and regulatory genes of the flavonoid pathway as revealed by a transcriptomic analysis. The physiological role of these repressors was inferred by combining the results of the functional analyses and their expression patterns in grapevine during development and in response to ultraviolet B radiation. Our results indicate that VvMYB4a and VvMYB4b may play a key role in negatively regulating the synthesis of small-weight phenolic compounds, whereas VvMYBC2-L1 and VvMYBC2-L3 may additionally fine tune flavonoid levels, balancing the inductive effects of transcriptional activators.
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Affiliation(s)
- Erika Cavallini
- Department of Biotechnology, University of Verona, 15-37134 Verona, Italy (E.C., L.F., S.Z., F.G., G.B.T.);Center for Research in Agricultural Genomics-Consejo Superior de Investigaciones Científicas-Institut de Recerca i Tecnologia Agroalimentàries-Universitat Autònoma de Barcelona-Universitat de Barcelona, 08193 Bellaterra, Barcelona, Spain (J.T.M.);Departamento de Fruticultura y Enología, Facultad de Agronomía e Ingeniería Forestal, Pontificia Universidad Católica de Chile, 6904411 Santiago, Chile (R.L.); Departamento de Genética Molecular y Microbiología, Facultad de Ciencias Biológica, Pontificia Universidad Católica de Chile, 8331150 Santiago, Chile (R.L., R.S., P.A.-J.); andInstitut National de la Recherche Agronomique, Unité Mixte de Recherche 1083 Sciences pour l'Oenologie, F-34060 Montpellier, France (A.A.)
| | - José Tomás Matus
- Department of Biotechnology, University of Verona, 15-37134 Verona, Italy (E.C., L.F., S.Z., F.G., G.B.T.);Center for Research in Agricultural Genomics-Consejo Superior de Investigaciones Científicas-Institut de Recerca i Tecnologia Agroalimentàries-Universitat Autònoma de Barcelona-Universitat de Barcelona, 08193 Bellaterra, Barcelona, Spain (J.T.M.);Departamento de Fruticultura y Enología, Facultad de Agronomía e Ingeniería Forestal, Pontificia Universidad Católica de Chile, 6904411 Santiago, Chile (R.L.); Departamento de Genética Molecular y Microbiología, Facultad de Ciencias Biológica, Pontificia Universidad Católica de Chile, 8331150 Santiago, Chile (R.L., R.S., P.A.-J.); andInstitut National de la Recherche Agronomique, Unité Mixte de Recherche 1083 Sciences pour l'Oenologie, F-34060 Montpellier, France (A.A.)
| | - Laura Finezzo
- Department of Biotechnology, University of Verona, 15-37134 Verona, Italy (E.C., L.F., S.Z., F.G., G.B.T.);Center for Research in Agricultural Genomics-Consejo Superior de Investigaciones Científicas-Institut de Recerca i Tecnologia Agroalimentàries-Universitat Autònoma de Barcelona-Universitat de Barcelona, 08193 Bellaterra, Barcelona, Spain (J.T.M.);Departamento de Fruticultura y Enología, Facultad de Agronomía e Ingeniería Forestal, Pontificia Universidad Católica de Chile, 6904411 Santiago, Chile (R.L.); Departamento de Genética Molecular y Microbiología, Facultad de Ciencias Biológica, Pontificia Universidad Católica de Chile, 8331150 Santiago, Chile (R.L., R.S., P.A.-J.); andInstitut National de la Recherche Agronomique, Unité Mixte de Recherche 1083 Sciences pour l'Oenologie, F-34060 Montpellier, France (A.A.)
| | - Sara Zenoni
- Department of Biotechnology, University of Verona, 15-37134 Verona, Italy (E.C., L.F., S.Z., F.G., G.B.T.);Center for Research in Agricultural Genomics-Consejo Superior de Investigaciones Científicas-Institut de Recerca i Tecnologia Agroalimentàries-Universitat Autònoma de Barcelona-Universitat de Barcelona, 08193 Bellaterra, Barcelona, Spain (J.T.M.);Departamento de Fruticultura y Enología, Facultad de Agronomía e Ingeniería Forestal, Pontificia Universidad Católica de Chile, 6904411 Santiago, Chile (R.L.); Departamento de Genética Molecular y Microbiología, Facultad de Ciencias Biológica, Pontificia Universidad Católica de Chile, 8331150 Santiago, Chile (R.L., R.S., P.A.-J.); andInstitut National de la Recherche Agronomique, Unité Mixte de Recherche 1083 Sciences pour l'Oenologie, F-34060 Montpellier, France (A.A.)
| | - Rodrigo Loyola
- Department of Biotechnology, University of Verona, 15-37134 Verona, Italy (E.C., L.F., S.Z., F.G., G.B.T.);Center for Research in Agricultural Genomics-Consejo Superior de Investigaciones Científicas-Institut de Recerca i Tecnologia Agroalimentàries-Universitat Autònoma de Barcelona-Universitat de Barcelona, 08193 Bellaterra, Barcelona, Spain (J.T.M.);Departamento de Fruticultura y Enología, Facultad de Agronomía e Ingeniería Forestal, Pontificia Universidad Católica de Chile, 6904411 Santiago, Chile (R.L.); Departamento de Genética Molecular y Microbiología, Facultad de Ciencias Biológica, Pontificia Universidad Católica de Chile, 8331150 Santiago, Chile (R.L., R.S., P.A.-J.); andInstitut National de la Recherche Agronomique, Unité Mixte de Recherche 1083 Sciences pour l'Oenologie, F-34060 Montpellier, France (A.A.)
| | - Flavia Guzzo
- Department of Biotechnology, University of Verona, 15-37134 Verona, Italy (E.C., L.F., S.Z., F.G., G.B.T.);Center for Research in Agricultural Genomics-Consejo Superior de Investigaciones Científicas-Institut de Recerca i Tecnologia Agroalimentàries-Universitat Autònoma de Barcelona-Universitat de Barcelona, 08193 Bellaterra, Barcelona, Spain (J.T.M.);Departamento de Fruticultura y Enología, Facultad de Agronomía e Ingeniería Forestal, Pontificia Universidad Católica de Chile, 6904411 Santiago, Chile (R.L.); Departamento de Genética Molecular y Microbiología, Facultad de Ciencias Biológica, Pontificia Universidad Católica de Chile, 8331150 Santiago, Chile (R.L., R.S., P.A.-J.); andInstitut National de la Recherche Agronomique, Unité Mixte de Recherche 1083 Sciences pour l'Oenologie, F-34060 Montpellier, France (A.A.)
| | - Rudolf Schlechter
- Department of Biotechnology, University of Verona, 15-37134 Verona, Italy (E.C., L.F., S.Z., F.G., G.B.T.);Center for Research in Agricultural Genomics-Consejo Superior de Investigaciones Científicas-Institut de Recerca i Tecnologia Agroalimentàries-Universitat Autònoma de Barcelona-Universitat de Barcelona, 08193 Bellaterra, Barcelona, Spain (J.T.M.);Departamento de Fruticultura y Enología, Facultad de Agronomía e Ingeniería Forestal, Pontificia Universidad Católica de Chile, 6904411 Santiago, Chile (R.L.); Departamento de Genética Molecular y Microbiología, Facultad de Ciencias Biológica, Pontificia Universidad Católica de Chile, 8331150 Santiago, Chile (R.L., R.S., P.A.-J.); andInstitut National de la Recherche Agronomique, Unité Mixte de Recherche 1083 Sciences pour l'Oenologie, F-34060 Montpellier, France (A.A.)
| | - Agnès Ageorges
- Department of Biotechnology, University of Verona, 15-37134 Verona, Italy (E.C., L.F., S.Z., F.G., G.B.T.);Center for Research in Agricultural Genomics-Consejo Superior de Investigaciones Científicas-Institut de Recerca i Tecnologia Agroalimentàries-Universitat Autònoma de Barcelona-Universitat de Barcelona, 08193 Bellaterra, Barcelona, Spain (J.T.M.);Departamento de Fruticultura y Enología, Facultad de Agronomía e Ingeniería Forestal, Pontificia Universidad Católica de Chile, 6904411 Santiago, Chile (R.L.); Departamento de Genética Molecular y Microbiología, Facultad de Ciencias Biológica, Pontificia Universidad Católica de Chile, 8331150 Santiago, Chile (R.L., R.S., P.A.-J.); andInstitut National de la Recherche Agronomique, Unité Mixte de Recherche 1083 Sciences pour l'Oenologie, F-34060 Montpellier, France (A.A.)
| | - Patricio Arce-Johnson
- Department of Biotechnology, University of Verona, 15-37134 Verona, Italy (E.C., L.F., S.Z., F.G., G.B.T.);Center for Research in Agricultural Genomics-Consejo Superior de Investigaciones Científicas-Institut de Recerca i Tecnologia Agroalimentàries-Universitat Autònoma de Barcelona-Universitat de Barcelona, 08193 Bellaterra, Barcelona, Spain (J.T.M.);Departamento de Fruticultura y Enología, Facultad de Agronomía e Ingeniería Forestal, Pontificia Universidad Católica de Chile, 6904411 Santiago, Chile (R.L.); Departamento de Genética Molecular y Microbiología, Facultad de Ciencias Biológica, Pontificia Universidad Católica de Chile, 8331150 Santiago, Chile (R.L., R.S., P.A.-J.); andInstitut National de la Recherche Agronomique, Unité Mixte de Recherche 1083 Sciences pour l'Oenologie, F-34060 Montpellier, France (A.A.)
| | - Giovanni Battista Tornielli
- Department of Biotechnology, University of Verona, 15-37134 Verona, Italy (E.C., L.F., S.Z., F.G., G.B.T.);Center for Research in Agricultural Genomics-Consejo Superior de Investigaciones Científicas-Institut de Recerca i Tecnologia Agroalimentàries-Universitat Autònoma de Barcelona-Universitat de Barcelona, 08193 Bellaterra, Barcelona, Spain (J.T.M.);Departamento de Fruticultura y Enología, Facultad de Agronomía e Ingeniería Forestal, Pontificia Universidad Católica de Chile, 6904411 Santiago, Chile (R.L.); Departamento de Genética Molecular y Microbiología, Facultad de Ciencias Biológica, Pontificia Universidad Católica de Chile, 8331150 Santiago, Chile (R.L., R.S., P.A.-J.); andInstitut National de la Recherche Agronomique, Unité Mixte de Recherche 1083 Sciences pour l'Oenologie, F-34060 Montpellier, France (A.A.)
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25
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Li JB, Luan YS, Yin YL. SpMYB overexpression in tobacco plants leads to altered abiotic and biotic stress responses. Gene 2014; 547:145-51. [PMID: 24971506 DOI: 10.1016/j.gene.2014.06.049] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Revised: 05/16/2014] [Accepted: 06/23/2014] [Indexed: 11/30/2022]
Abstract
The MYB transcription factors are involved in various plant biochemistry and physiology processes and play a central role in plant defense response. In the present study, a full-length cDNA sequence of a MYB gene, designated as SpMYB, was isolated from tomato. SpMYB encodes the R2R3-type protein consisting of 328 amino acids. The expression level of SpMYB was strongly induced by fungal pathogens. Transgenic tobacco plants overexpressing SpMYB had an enhanced salt and drought stress tolerance compared with wild-type plants, and showed significantly improved resistance to Alternaria alternate. Further analysis revealed that transgenic tobaccos exhibited less accumulation of malondialdehyde (MDA) and more accumulation of superoxide dismutase (SOD), peroxidase (POD) and phenylalanine ammonia-lyase (PAL) after inoculation with A. alternate. Meanwhile, changes in some photosynthetic parameters, such as photosynthetic rate (Pn), transpiration rate (Tr) and intercellular CO2 concentration (Ci) were also found in the transgenic tobaccos. Furthermore, transgenic tobaccos constitutively accumulated higher levels of pathogenesis-related (PR) gene transcripts, such as PR1 and PR2. The results suggested that the tomato SpMYB transcription factor plays an important role in responses to abiotic and biotic stress.
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Affiliation(s)
- Jing-Bin Li
- School of Life science and Biotechnology, Dalian University of Technology, Dalian 116024, China
| | - Yu-Shi Luan
- School of Life science and Biotechnology, Dalian University of Technology, Dalian 116024, China.
| | - Ya-Li Yin
- School of Life science and Biotechnology, Dalian University of Technology, Dalian 116024, China
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26
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Genome-wide analysis of the R2R3-MYB transcription factor gene family in sweet orange (Citrus sinensis). Mol Biol Rep 2014; 41:6769-85. [DOI: 10.1007/s11033-014-3563-1] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2013] [Accepted: 06/24/2014] [Indexed: 01/22/2023]
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27
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Singh R, Low ETL, Ooi LCL, Ong-Abdullah M, Nookiah R, Ting NC, Marjuni M, Chan PL, Ithnin M, Manaf MAA, Nagappan J, Chan KL, Rosli R, Halim MA, Azizi N, Budiman MA, Lakey N, Bacher B, Van Brunt A, Wang C, Hogan M, He D, MacDonald JD, Smith SW, Ordway JM, Martienssen RA, Sambanthamurthi R. The oil palm VIRESCENS gene controls fruit colour and encodes a R2R3-MYB. Nat Commun 2014; 5:4106. [PMID: 24978855 PMCID: PMC4078410 DOI: 10.1038/ncomms5106] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2013] [Accepted: 05/13/2014] [Indexed: 11/17/2022] Open
Abstract
Oil palm, a plantation crop of major economic importance in Southeast Asia, is the predominant source of edible oil worldwide. We report the identification of the VIRESCENS (VIR) gene, which controls fruit exocarp colour and is an indicator of ripeness. VIR is a R2R3-MYB transcription factor with homology to Lilium LhMYB12 and similarity to Arabidopsis PRODUCTION OF ANTHOCYANIN PIGMENT1 (PAP1). We identify five independent mutant alleles of VIR in over 400 accessions from sub-Saharan Africa that account for the dominant-negative virescens phenotype. Each mutation results in premature termination of the carboxy-terminal domain of VIR, resembling McClintock’s C1-I allele in maize. The abundance of alleles likely reflects cultural practices, by which fruits were venerated for magical and medicinal properties. The identification of VIR will allow selection of the trait at the seed or early-nursery stage, 3-6 years before fruits are produced, greatly advancing introgression into elite breeding material. Fruit colour is a trait that affects the harvesting, and therefore oil yield, of the economically important oil palm. Here, the authors identify a gene that may control fruit colour in the oil palm and suggest that selection for this gene during early development could advance the breeding potential of this important crop.
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Affiliation(s)
- Rajinder Singh
- Malaysian Palm Oil Board, Advanced Biotechnology and Breeding Centre, 6, Persiaran Institusi, Bandar Baru Bangi, 43000 Kajang, Selangor, Malaysia
| | - Eng-Ti Leslie Low
- Malaysian Palm Oil Board, Advanced Biotechnology and Breeding Centre, 6, Persiaran Institusi, Bandar Baru Bangi, 43000 Kajang, Selangor, Malaysia
| | - Leslie Cheng-Li Ooi
- Malaysian Palm Oil Board, Advanced Biotechnology and Breeding Centre, 6, Persiaran Institusi, Bandar Baru Bangi, 43000 Kajang, Selangor, Malaysia
| | - Meilina Ong-Abdullah
- Malaysian Palm Oil Board, Advanced Biotechnology and Breeding Centre, 6, Persiaran Institusi, Bandar Baru Bangi, 43000 Kajang, Selangor, Malaysia
| | - Rajanaidu Nookiah
- Malaysian Palm Oil Board, Advanced Biotechnology and Breeding Centre, 6, Persiaran Institusi, Bandar Baru Bangi, 43000 Kajang, Selangor, Malaysia
| | - Ngoot-Chin Ting
- Malaysian Palm Oil Board, Advanced Biotechnology and Breeding Centre, 6, Persiaran Institusi, Bandar Baru Bangi, 43000 Kajang, Selangor, Malaysia
| | - Marhalil Marjuni
- Malaysian Palm Oil Board, Advanced Biotechnology and Breeding Centre, 6, Persiaran Institusi, Bandar Baru Bangi, 43000 Kajang, Selangor, Malaysia
| | - Pek-Lan Chan
- Malaysian Palm Oil Board, Advanced Biotechnology and Breeding Centre, 6, Persiaran Institusi, Bandar Baru Bangi, 43000 Kajang, Selangor, Malaysia
| | - Maizura Ithnin
- Malaysian Palm Oil Board, Advanced Biotechnology and Breeding Centre, 6, Persiaran Institusi, Bandar Baru Bangi, 43000 Kajang, Selangor, Malaysia
| | - Mohd Arif Abdul Manaf
- Malaysian Palm Oil Board, Advanced Biotechnology and Breeding Centre, 6, Persiaran Institusi, Bandar Baru Bangi, 43000 Kajang, Selangor, Malaysia
| | - Jayanthi Nagappan
- Malaysian Palm Oil Board, Advanced Biotechnology and Breeding Centre, 6, Persiaran Institusi, Bandar Baru Bangi, 43000 Kajang, Selangor, Malaysia
| | - Kuang-Lim Chan
- Malaysian Palm Oil Board, Advanced Biotechnology and Breeding Centre, 6, Persiaran Institusi, Bandar Baru Bangi, 43000 Kajang, Selangor, Malaysia
| | - Rozana Rosli
- Malaysian Palm Oil Board, Advanced Biotechnology and Breeding Centre, 6, Persiaran Institusi, Bandar Baru Bangi, 43000 Kajang, Selangor, Malaysia
| | - Mohd Amin Halim
- Malaysian Palm Oil Board, Advanced Biotechnology and Breeding Centre, 6, Persiaran Institusi, Bandar Baru Bangi, 43000 Kajang, Selangor, Malaysia
| | - Norazah Azizi
- Malaysian Palm Oil Board, Advanced Biotechnology and Breeding Centre, 6, Persiaran Institusi, Bandar Baru Bangi, 43000 Kajang, Selangor, Malaysia
| | | | - Nathan Lakey
- Orion Genomics, 4041 Forest Park Ave., St. Louis, Missouri 63108, USA
| | - Blaire Bacher
- Orion Genomics, 4041 Forest Park Ave., St. Louis, Missouri 63108, USA
| | - Andrew Van Brunt
- Orion Genomics, 4041 Forest Park Ave., St. Louis, Missouri 63108, USA
| | - Chunyan Wang
- Orion Genomics, 4041 Forest Park Ave., St. Louis, Missouri 63108, USA
| | - Michael Hogan
- Orion Genomics, 4041 Forest Park Ave., St. Louis, Missouri 63108, USA
| | - Dong He
- Orion Genomics, 4041 Forest Park Ave., St. Louis, Missouri 63108, USA
| | - Jill D MacDonald
- Orion Genomics, 4041 Forest Park Ave., St. Louis, Missouri 63108, USA
| | - Steven W Smith
- Orion Genomics, 4041 Forest Park Ave., St. Louis, Missouri 63108, USA
| | - Jared M Ordway
- Orion Genomics, 4041 Forest Park Ave., St. Louis, Missouri 63108, USA
| | - Robert A Martienssen
- Howard Hughes Medical Institute-Gordon and Betty Moore Foundation, Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724, USA
| | - Ravigadevi Sambanthamurthi
- Malaysian Palm Oil Board, Advanced Biotechnology and Breeding Centre, 6, Persiaran Institusi, Bandar Baru Bangi, 43000 Kajang, Selangor, Malaysia
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28
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Zhao K, Bartley LE. Comparative genomic analysis of the R2R3 MYB secondary cell wall regulators of Arabidopsis, poplar, rice, maize, and switchgrass. BMC PLANT BIOLOGY 2014; 14:135. [PMID: 24885077 PMCID: PMC4057907 DOI: 10.1186/1471-2229-14-135] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2014] [Accepted: 05/09/2014] [Indexed: 05/17/2023]
Abstract
BACKGROUND R2R3 MYB proteins constitute one of the largest plant transcription factor clades and regulate diverse plant-specific processes. Several R2R3 MYB proteins act as regulators of secondary cell wall (SCW) biosynthesis in Arabidopsis thaliana (At), a dicotyledenous plant. Relatively few studies have examined SCW R2R3 MYB function in grasses, which may have diverged from dicots in terms of SCW regulatory mechanisms, as they have in cell wall composition and patterning. Understanding cell wall regulation is especially important for improving lignocellulosic bioenergy crops, such as switchgrass. RESULTS Here, we describe the results of applying phylogenic, OrthoMCL, and sequence identity analyses to classify the R2R3 MYB family proteins from the annotated proteomes of Arabidposis, poplar, rice, maize and the initial genome (v0.0) and translated transcriptome of switchgrass (Panicum virgatum). We find that the R2R3 MYB proteins of the five species fall into 48 subgroups, including three dicot-specific, six grass-specific, and two panicoid grass-expanded subgroups. We observe four classes of phylogenetic relationships within the subgroups of known SCW-regulating MYB proteins between Arabidopsis and rice, ranging from likely one-to-one orthology (for AtMYB26, AtMYB103, AtMYB69) to no homologs identifiable (for AtMYB75). Microarray data for putative switchgrass SCW MYBs indicate that many maintain similar expression patterns with the Arabidopsis SCW regulators. However, some of the switchgrass-expanded candidate SCW MYBs exhibit differences in gene expression patterns among paralogs, consistent with subfunctionalization. Furthermore, some switchgrass representatives of grass-expanded clades have gene expression patterns consistent with regulating SCW development. CONCLUSIONS Our analysis suggests that no single comparative genomics tool is able to provide a complete picture of the R2R3 MYB protein family without leaving ambiguities, and establishing likely false-negative and -positive relationships, but that used together a relatively clear view emerges. Generally, we find that most R2R3 MYBs that regulate SCW in Arabidopsis are likely conserved in the grasses. This comparative analysis of the R2R3 MYB family will facilitate transfer of understanding of regulatory mechanisms among species and enable control of SCW biosynthesis in switchgrass toward improving its biomass quality.
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Affiliation(s)
- Kangmei Zhao
- Department of Microbiology and Plant Biology, University of Oklahoma, Norman, OK 73019, USA
| | - Laura E Bartley
- Department of Microbiology and Plant Biology, University of Oklahoma, Norman, OK 73019, USA
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29
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Sharma N, Bhalla PL, Singh MB. Transcriptome-wide profiling and expression analysis of transcription factor families in a liverwort, Marchantia polymorpha. BMC Genomics 2013; 14:915. [PMID: 24365221 PMCID: PMC3880041 DOI: 10.1186/1471-2164-14-915] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2013] [Accepted: 11/27/2013] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND Transcription factors (TFs) are vital elements that regulate transcription and the spatio-temporal expression of genes, thereby ensuring the accurate development and functioning of an organism. The identification of TF-encoding genes in a liverwort, Marchantia polymorpha, offers insights into TF organization in the members of the most basal lineages of land plants (embryophytes). Therefore, a comparison of Marchantia TF genes with other land plants (monocots, dicots, bryophytes) and algae (chlorophytes, rhodophytes) provides the most comprehensive view of the rates of expansion or contraction of TF genes in plant evolution. RESULTS In this study, we report the identification of TF-encoding transcripts in M. polymorpha for the first time, as evidenced by deep RNA sequencing data. In total, 3,471 putative TF encoding transcripts, distributed in 80 families, were identified, representing 7.4% of the generated Marchantia gametophytic transcriptome dataset. Overall, TF basic functions and distribution across families appear to be conserved when compared to other plant species. However, it is of interest to observe the genesis of novel sequences in 24 TF families and the apparent termination of 2 TF families with the emergence of Marchantia. Out of 24 TF families, 6 are known to be associated with plant reproductive development processes. We also examined the expression pattern of these TF-encoding transcripts in six male and female developmental stages in vegetative and reproductive gametophytic tissues of Marchantia. CONCLUSIONS The analysis highlighted the importance of Marchantia, a model plant system, in an evolutionary context. The dataset generated here provides a scientific resource for TF gene discovery and other comparative evolutionary studies of land plants.
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Affiliation(s)
- Niharika Sharma
- Plant Molecular Biology and Biotechnology Laboratory, Australian Research Council Centre of Excellence for Integrative Legume Research, Melbourne School of Land and Environment, University of Melbourne, Parkville, Melbourne, Victoria 3010, Australia
| | - Prem L Bhalla
- Plant Molecular Biology and Biotechnology Laboratory, Australian Research Council Centre of Excellence for Integrative Legume Research, Melbourne School of Land and Environment, University of Melbourne, Parkville, Melbourne, Victoria 3010, Australia
| | - Mohan B Singh
- Plant Molecular Biology and Biotechnology Laboratory, Australian Research Council Centre of Excellence for Integrative Legume Research, Melbourne School of Land and Environment, University of Melbourne, Parkville, Melbourne, Victoria 3010, Australia
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30
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Agati G, Brunetti C, Di Ferdinando M, Ferrini F, Pollastri S, Tattini M. Functional roles of flavonoids in photoprotection: new evidence, lessons from the past. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2013; 72:35-45. [PMID: 23583204 DOI: 10.1016/j.plaphy.2013.03.014] [Citation(s) in RCA: 261] [Impact Index Per Article: 23.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2012] [Accepted: 03/18/2013] [Indexed: 05/18/2023]
Abstract
We discuss on the relative significance of different functional roles potentially served by flavonoids in photoprotection, with special emphasis to their ability to scavenge reactive oxygen species (ROS) and control the development of individual organs and whole plant. We propose a model in which chloroplast-located flavonoids scavenge H2O2 and singlet oxygen generated under excess light-stress, thus avoiding programmed cell death. We also draw a picture in which vacuolar flavonoids in conjunction with peroxidases and ascorbic acid constitute a secondary antioxidant system aimed at detoxifying H2O2, which may diffuse out of the chloroplast at considerable rates and enter the vacuole following excess light stress-induced depletion of ascorbate peroxidase. We hypothesize for flavonols key roles as developmental regulators in early and current-day land-plants, based on their ability to modulate auxin movement and auxin catabolism. We show that antioxidant flavonoids display the greatest capacity to regulate key steps of cell growth and differentiation in eukaryotes. These regulatory functions of flavonoids, which are shared by plants and animals, are fully accomplished in the nM concentration range, as likely occurred in early land plants. We therefore conclude that functions of flavonoids as antioxidants and/or developmental regulators flavonoids are of great value in photoprotection. We also suggest that UV-B screening was just one of the multiple functions served by flavonoids when early land-plants faced an abrupt increase in sunlight irradiance.
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Affiliation(s)
- Giovanni Agati
- Istituto di Fisica Applicata 'Carrara', IFAC, Consiglio Nazionale delle Ricerche, Via Madonna del Piano 10, I-50019 Sesto Fiorentino, Firenze, Italy
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31
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Lai Y, Li H, Yamagishi M. A review of target gene specificity of flavonoid R2R3-MYB transcription factors and a discussion of factors contributing to the target gene selectivity. ACTA ACUST UNITED AC 2013. [DOI: 10.1007/s11515-013-1281-z] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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32
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Ambawat S, Sharma P, Yadav NR, Yadav RC. MYB transcription factor genes as regulators for plant responses: an overview. PHYSIOLOGY AND MOLECULAR BIOLOGY OF PLANTS : AN INTERNATIONAL JOURNAL OF FUNCTIONAL PLANT BIOLOGY 2013; 19:307-21. [PMID: 24431500 PMCID: PMC3715649 DOI: 10.1007/s12298-013-0179-1] [Citation(s) in RCA: 521] [Impact Index Per Article: 47.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Regulation of gene expression at the level of transcription controls many crucial biological processes. Transcription factors (TFs) play a great role in controlling cellular processes and MYB TF family is large and involved in controlling various processes like responses to biotic and abiotic stresses, development, differentiation, metabolism, defense etc. Here, we review MYB TFs with particular emphasis on their role in controlling different biological processes. This will provide valuable insights in understanding regulatory networks and associated functions to develop strategies for crop improvement.
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Affiliation(s)
- Supriya Ambawat
- Department of Molecular Biology and Biotechnology, CCS Haryana Agricultural University, Hisar, 125004 India
| | - Poonam Sharma
- Department of Molecular Biology and Biotechnology, CCS Haryana Agricultural University, Hisar, 125004 India
| | - Neelam R. Yadav
- Department of Molecular Biology and Biotechnology, CCS Haryana Agricultural University, Hisar, 125004 India
| | - Ram C. Yadav
- Department of Molecular Biology and Biotechnology, CCS Haryana Agricultural University, Hisar, 125004 India
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Liu X, Yang L, Zhou X, Zhou M, Lu Y, Ma L, Ma H, Zhang Z. Transgenic wheat expressing Thinopyrum intermedium MYB transcription factor TiMYB2R-1 shows enhanced resistance to the take-all disease. JOURNAL OF EXPERIMENTAL BOTANY 2013; 64:2243-53. [PMID: 23547108 PMCID: PMC3654416 DOI: 10.1093/jxb/ert084] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
The disease take-all, caused by the fungus Gaeumannomyces graminis, is one of the most destructive root diseases of wheat worldwide. Breeding resistant cultivars is an effective way to protect wheat from take-all. However, little progress has been made in improving the disease resistance level in commercial wheat cultivars. MYB transcription factors play important roles in plant responses to environmental stresses. In this study, an R2R3-MYB gene in Thinopyrum intermedium, TiMYB2R-1, was cloned and characterized. The gene sequence includes two exons and an intron. The expression of TiMYB2R-1 was significantly induced following G. graminis infection. An in vitro DNA binding assay proved that TiMYB2R-1 protein could bind to the MYB-binding site cis-element ACI. Subcellular localization assays revealed that TiMYB2R-1 was localized in the nucleus. TiMYB2R-1 transgenic wheat plants were generated, characterized molecularly, and evaluated for take-all resistance. PCR and Southern blot analyses confirmed that TiMYB2R-1 was integrated into the genomes of three independent transgenic wheat lines by distinct patterns and the transgene was heritable. Reverse transcription-PCR and western blot analyses revealed that TiMYB2R-1 was highly expressed in the transgenic wheat lines. Based on disease response assessments for three successive generations, the significantly enhanced resistance to take-all was observed in the three TiMYB2R-1-overexpressing transgenic wheat lines. Furthermore, the transcript levels of at least six wheat defence-related genes were significantly elevated in the TiMYB2R-1 transgenic wheat lines. These results suggest that engineering and overexpression of TiMYB2R-1 may be used for improving take-all resistance of wheat and other cereal crops.
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Affiliation(s)
- Xin Liu
- The National Key Facility for Crop Gene Resources and Genetic Improvement/Key Laboratory of Biology and Genetic Improvement of Triticeae Crops of the Agriculture Ministry, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China
- *These authors contributed equally to this work
| | - Lihua Yang
- The National Key Facility for Crop Gene Resources and Genetic Improvement/Key Laboratory of Biology and Genetic Improvement of Triticeae Crops of the Agriculture Ministry, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China
- College of Agronomy, Northwest A&F University, Yangling 712100, China
- *These authors contributed equally to this work
| | - Xianyao Zhou
- The National Key Facility for Crop Gene Resources and Genetic Improvement/Key Laboratory of Biology and Genetic Improvement of Triticeae Crops of the Agriculture Ministry, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China
- *These authors contributed equally to this work
| | - Miaoping Zhou
- Biotechnology Institute, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
- *These authors contributed equally to this work
| | - Yan Lu
- The National Key Facility for Crop Gene Resources and Genetic Improvement/Key Laboratory of Biology and Genetic Improvement of Triticeae Crops of the Agriculture Ministry, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Lingjian Ma
- College of Agronomy, Northwest A&F University, Yangling 712100, China
| | - Hongxiang Ma
- Biotechnology Institute, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
| | - Zengyan Zhang
- The National Key Facility for Crop Gene Resources and Genetic Improvement/Key Laboratory of Biology and Genetic Improvement of Triticeae Crops of the Agriculture Ministry, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China
- To whom correspondence should be addressed. E-mail:
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Tohge T, Watanabe M, Hoefgen R, Fernie AR. The evolution of phenylpropanoid metabolism in the green lineage. Crit Rev Biochem Mol Biol 2013; 48:123-52. [PMID: 23350798 DOI: 10.3109/10409238.2012.758083] [Citation(s) in RCA: 160] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Phenolic secondary metabolites are only produced by plants wherein they play important roles in both biotic and abiotic defense in seed plants as well as being potentially important bioactive compounds with both nutritional and medicinal benefits reported for animals and humans as a consequence of their potent antioxidant activity. During the long evolutionary period in which plants have adapted to the environmental niches in which they exist (and especially during the evolution of land plants from their aquatic algal ancestors), several strategies such as gene duplication and convergent evolution have contributed to the evolution of this pathway. In this respect, diversity and redundancy of several key genes of phenolic secondary metabolism such as polyketide synthases, cytochrome P450s, Fe(2+)/2-oxoglutarate-dependent dioxygenases and UDP-glycosyltransferases have played an essential role. Recent technical developments allowing affordable whole genome sequencing as well as a better inventory of species-by-species chemical diversity have resulted in a dramatic increase in the number of tools we have to assess how these pathways evolved. In parallel, reverse genetics combined with detailed molecular phenotyping is allowing us to elucidate the functional importance of individual genes and metabolites and by this means to provide further mechanistic insight into their biological roles. In this review, phenolic metabolite-related gene sequences (for a total of 65 gene families including shikimate biosynthetic genes) are compared across 23 independent species, and the phenolic metabolic complement of various plant species are compared with one another, in attempt to better understand the evolution of diversity in this crucial pathway.
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Affiliation(s)
- Takayuki Tohge
- Max Planck Institute of Molecular Plant Physiology, Potsdam-Golm, Germany.
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Arratia J, Aguirre J. Los factores de transcripción tipo Myb, una familia de reguladores de la diferenciación celular conservada en los organismos eucariontes. TIP REVISTA ESPECIALIZADA EN CIENCIAS QUÍMICO-BIOLÓGICAS 2013. [DOI: 10.1016/s1405-888x(13)72081-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Omer S, Kumar S, Khan BM. Over-expression of a subgroup 4 R2R3 type MYB transcription factor gene from Leucaena leucocephala reduces lignin content in transgenic tobacco. PLANT CELL REPORTS 2013; 32:161-71. [PMID: 23052594 DOI: 10.1007/s00299-012-1350-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2012] [Revised: 09/18/2012] [Accepted: 09/19/2012] [Indexed: 06/01/2023]
Abstract
KEY MESSAGE : LlMYB1 , a subgroup 4 R2R3-type MYB transcription factor gene from Leucaena leucocephala appears to be a repressor of lignin biosynthesis pathway by regulating the transcription of general phenylpropanoid pathway genes. R2R3MYB transcription factors are known to play a wide role in regulating the phenylpropanoid pathway in plants. In this study, we report isolation, cloning and characterization of an R2R3MYB transcription factor gene (LlMYB1) from an economically important tree species, Leucaena leucocephala. LlMYB1 consists of 705 bp coding sequence corresponding to 235 amino acids. Sequence alignment revealed that the N-terminal (MYB) domain of the gene shares up to 95 % similarity with subgroup 4 (Sg4) members of R2R3Myb gene family functionally known to be lignin repressors. Highly divergent C-terminal region of the gene carried an ERF-associated amphiphilic repression (EAR) motif, another characteristic of the Sg4. The gene was phylogenetically grouped closest with AmMYB308, a known repressor of monolignol biosynthetic pathway genes. Spatio-temporal expression studies at different ages of seedlings using quantitative real-time PCR (QRT-PCR) showed highest transcript level of the gene in 10 day old stem tissues. Over-expression of the gene in transgenic tobacco showed statistically significant decline in the transcript levels of the general phenylpropanoid pathway genes and reduction in lignin content. Our study suggests that LlMYB1 might be playing the role of a repressor of lignin biosynthesis in L. leucocephala.
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Affiliation(s)
- Sumita Omer
- Plant Tissue Culture Division, CSIR-National Chemical Laboratory, Pune 411008, India
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37
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Agati G, Azzarello E, Pollastri S, Tattini M. Flavonoids as antioxidants in plants: location and functional significance. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2012; 196:67-76. [PMID: 23017900 DOI: 10.1016/j.plantsci.2012.07.014] [Citation(s) in RCA: 928] [Impact Index Per Article: 77.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2012] [Revised: 07/28/2012] [Accepted: 07/30/2012] [Indexed: 05/18/2023]
Abstract
Stress-responsive dihydroxy B-ring-substituted flavonoids have great potential to inhibit the generation of reactive oxygen species (ROS) and reduce the levels of ROS once they are formed, i.e., to perform antioxidant functions. These flavonoids are located within or in the proximity of centers of ROS generation in severely stressed plants. Efficient mechanisms have been recently identified for the transport of flavonoids from the endoplasmic reticulum, the site of their biosynthesis, to different cellular compartments. The mechanism underlying flavonoid-mediated ROS reduction in plants is still unclear. 'Antioxidant' flavonoids are found in the chloroplast, which suggests a role as scavengers of singlet oxygen and stabilizers of the chloroplast outer envelope membrane. Dihydroxy B-ring substituted flavonoids are present in the nucleus of mesophyll cells and may inhibit ROS-generation making complexes with Fe and Cu ions. The genes that govern the biosynthesis of antioxidant flavonoids are present in liverworts and mosses and are mostly up-regulated as a consequence of severe stress. This suggests that the antioxidant flavonoid metabolism is a robust trait of terrestrial plants. Vacuolar dihydroxy B-ring flavonoids have been reported to serve as co-substrates for vacuolar peroxidases to reduce H(2)O(2) escape from the chloroplast, following the depletion of ascorbate peroxidase activity. Antioxidant flavonoids may effectively control key steps of cell growth and differentiation, thus acting regulating the development of the whole plant and individual organs.
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Affiliation(s)
- Giovanni Agati
- Consiglio Nazionale delle Ricerche, Istituto di Fisica Applicata 'Carrara', Via Madonna del Piano 10, I-50019 Sesto F. No, Firenze, Italy
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Nakatsuka T, Saito M, Yamada E, Fujita K, Kakizaki Y, Nishihara M. Isolation and characterization of GtMYBP3 and GtMYBP4, orthologues of R2R3-MYB transcription factors that regulate early flavonoid biosynthesis, in gentian flowers. JOURNAL OF EXPERIMENTAL BOTANY 2012; 63:6505-17. [PMID: 23125348 PMCID: PMC3504500 DOI: 10.1093/jxb/ers306] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Flavonoids are one of the major plant pigments for flower colour. Not only coloured anthocyanins, but also co-pigment flavones or flavonols, accumulate in flowers. To study the regulation of early flavonoid biosynthesis, two R2R3-MYB transcription factors, GtMYBP3 and GtMYBP4, were identified from the petals of Japanese gentian (Gentiana triflora). Phylogenetic analysis showed that these two proteins belong to the subgroup 7 clade (flavonol-specific MYB), which includes Arabidopsis AtMYB12, grapevine VvMYBF1, and tomato SlMYB12. Gt MYBP3 and Gt MYBP4 transcripts were detected specifically in young petals and correlated with the profiles of flavone accumulation. Transient expression assays showed that GtMYBP3 and GtMYBP4 enhanced the promoter activities of early biosynthetic genes, including flavone synthase II (FNSII) and flavonoid 3'-hydroxylase (F3'H), but not the late biosynthetic gene, flavonoid 3',5'-hydroxylase (F3'5'H). GtMYBP3 also enhanced the promoter activity of the chalcone synthase (CHS) gene. In transgenic Arabidopsis, overexpression of Gt MYBP3 and Gt MYBP4 activated the expression of endogenous flavonol biosynthesis genes and led to increased flavonol accumulation in seedlings. In transgenic tobacco petals, overexpression of Gt MYBP3 and Gt MYBP4 caused decreased anthocyanin levels, resulting in pale flower colours. Gt MYBP4-expressing transgenic tobacco flowers also showed increased flavonols. As far as is known, this is the first functional characterization of R2R3-MYB transcription factors regulating early flavonoid biosynthesis in petals.
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Affiliation(s)
- Takashi Nakatsuka
- Iwate Biotechnology Research Center, 22-174-4 Narita, Kitakami, Iwate 024-0003, Japan
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Katiyar A, Smita S, Lenka SK, Rajwanshi R, Chinnusamy V, Bansal KC. Genome-wide classification and expression analysis of MYB transcription factor families in rice and Arabidopsis. BMC Genomics 2012. [PMID: 23050870 DOI: 10.1186/1471-2164-13] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/14/2023] Open
Abstract
BACKGROUND The MYB gene family comprises one of the richest groups of transcription factors in plants. Plant MYB proteins are characterized by a highly conserved MYB DNA-binding domain. MYB proteins are classified into four major groups namely, 1R-MYB, 2R-MYB, 3R-MYB and 4R-MYB based on the number and position of MYB repeats. MYB transcription factors are involved in plant development, secondary metabolism, hormone signal transduction, disease resistance and abiotic stress tolerance. A comparative analysis of MYB family genes in rice and Arabidopsis will help reveal the evolution and function of MYB genes in plants. RESULTS A genome-wide analysis identified at least 155 and 197 MYB genes in rice and Arabidopsis, respectively. Gene structure analysis revealed that MYB family genes possess relatively more number of introns in the middle as compared with C- and N-terminal regions of the predicted genes. Intronless MYB-genes are highly conserved both in rice and Arabidopsis. MYB genes encoding R2R3 repeat MYB proteins retained conserved gene structure with three exons and two introns, whereas genes encoding R1R2R3 repeat containing proteins consist of six exons and five introns. The splicing pattern is similar among R1R2R3 MYB genes in Arabidopsis. In contrast, variation in splicing pattern was observed among R1R2R3 MYB members of rice. Consensus motif analysis of 1kb upstream region (5' to translation initiation codon) of MYB gene ORFs led to the identification of conserved and over-represented cis-motifs in both rice and Arabidopsis. Real-time quantitative RT-PCR analysis showed that several members of MYBs are up-regulated by various abiotic stresses both in rice and Arabidopsis. CONCLUSION A comprehensive genome-wide analysis of chromosomal distribution, tandem repeats and phylogenetic relationship of MYB family genes in rice and Arabidopsis suggested their evolution via duplication. Genome-wide comparative analysis of MYB genes and their expression analysis identified several MYBs with potential role in development and stress response of plants.
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Affiliation(s)
- Amit Katiyar
- National Research Centre on Plant Biotechnology, Indian Agricultural Research Institute, New Delhi, 110012, India
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40
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Katiyar A, Smita S, Lenka SK, Rajwanshi R, Chinnusamy V, Bansal KC. Genome-wide classification and expression analysis of MYB transcription factor families in rice and Arabidopsis. BMC Genomics 2012; 13:544. [PMID: 23050870 PMCID: PMC3542171 DOI: 10.1186/1471-2164-13-544] [Citation(s) in RCA: 330] [Impact Index Per Article: 27.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2012] [Accepted: 10/01/2012] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The MYB gene family comprises one of the richest groups of transcription factors in plants. Plant MYB proteins are characterized by a highly conserved MYB DNA-binding domain. MYB proteins are classified into four major groups namely, 1R-MYB, 2R-MYB, 3R-MYB and 4R-MYB based on the number and position of MYB repeats. MYB transcription factors are involved in plant development, secondary metabolism, hormone signal transduction, disease resistance and abiotic stress tolerance. A comparative analysis of MYB family genes in rice and Arabidopsis will help reveal the evolution and function of MYB genes in plants. RESULTS A genome-wide analysis identified at least 155 and 197 MYB genes in rice and Arabidopsis, respectively. Gene structure analysis revealed that MYB family genes possess relatively more number of introns in the middle as compared with C- and N-terminal regions of the predicted genes. Intronless MYB-genes are highly conserved both in rice and Arabidopsis. MYB genes encoding R2R3 repeat MYB proteins retained conserved gene structure with three exons and two introns, whereas genes encoding R1R2R3 repeat containing proteins consist of six exons and five introns. The splicing pattern is similar among R1R2R3 MYB genes in Arabidopsis. In contrast, variation in splicing pattern was observed among R1R2R3 MYB members of rice. Consensus motif analysis of 1kb upstream region (5' to translation initiation codon) of MYB gene ORFs led to the identification of conserved and over-represented cis-motifs in both rice and Arabidopsis. Real-time quantitative RT-PCR analysis showed that several members of MYBs are up-regulated by various abiotic stresses both in rice and Arabidopsis. CONCLUSION A comprehensive genome-wide analysis of chromosomal distribution, tandem repeats and phylogenetic relationship of MYB family genes in rice and Arabidopsis suggested their evolution via duplication. Genome-wide comparative analysis of MYB genes and their expression analysis identified several MYBs with potential role in development and stress response of plants.
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Affiliation(s)
- Amit Katiyar
- National Research Centre on Plant Biotechnology, Indian Agricultural Research Institute, New Delhi, 110012, India
- National Bureau of Plant Genetic Resources, Indian Agricultural Research Institute Campus, New Delhi, 110012, India
| | - Shuchi Smita
- National Research Centre on Plant Biotechnology, Indian Agricultural Research Institute, New Delhi, 110012, India
- National Bureau of Plant Genetic Resources, Indian Agricultural Research Institute Campus, New Delhi, 110012, India
| | - Sangram Keshari Lenka
- National Research Centre on Plant Biotechnology, Indian Agricultural Research Institute, New Delhi, 110012, India
- Department of Biology, University of Massachusetts, Amherst, MA, 01003, USA
| | - Ravi Rajwanshi
- National Research Centre on Plant Biotechnology, Indian Agricultural Research Institute, New Delhi, 110012, India
- Department of Biotechnology, Assam University, Silchar, Assam, 788011, India
| | - Viswanathan Chinnusamy
- Division of Plant Physiology, Indian Agricultural Research Institute, New Delhi, 110012, India
| | - Kailash Chander Bansal
- National Research Centre on Plant Biotechnology, Indian Agricultural Research Institute, New Delhi, 110012, India
- National Bureau of Plant Genetic Resources, Indian Agricultural Research Institute Campus, New Delhi, 110012, India
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Du H, Yang SS, Liang Z, Feng BR, Liu L, Huang YB, Tang YX. Genome-wide analysis of the MYB transcription factor superfamily in soybean. BMC PLANT BIOLOGY 2012; 12:106. [PMID: 22776508 PMCID: PMC3462118 DOI: 10.1186/1471-2229-12-106] [Citation(s) in RCA: 243] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2011] [Accepted: 06/06/2012] [Indexed: 05/18/2023]
Abstract
BACKGROUND The MYB superfamily constitutes one of the most abundant groups of transcription factors described in plants. Nevertheless, their functions appear to be highly diverse and remain rather unclear. To date, no genome-wide characterization of this gene family has been conducted in a legume species. Here we report the first genome-wide analysis of the whole MYB superfamily in a legume species, soybean (Glycine max), including the gene structures, phylogeny, chromosome locations, conserved motifs, and expression patterns, as well as a comparative genomic analysis with Arabidopsis. RESULTS A total of 244 R2R3-MYB genes were identified and further classified into 48 subfamilies based on a phylogenetic comparative analysis with their putative orthologs, showed both gene loss and duplication events. The phylogenetic analysis showed that most characterized MYB genes with similar functions are clustered in the same subfamily, together with the identification of orthologs by synteny analysis, functional conservation among subgroups of MYB genes was strongly indicated. The phylogenetic relationships of each subgroup of MYB genes were well supported by the highly conserved intron/exon structures and motifs outside the MYB domain. Synonymous nucleotide substitution (dN/dS) analysis showed that the soybean MYB DNA-binding domain is under strong negative selection. The chromosome distribution pattern strongly indicated that genome-wide segmental and tandem duplication contribute to the expansion of soybean MYB genes. In addition, we found that ~ 4% of soybean R2R3-MYB genes had undergone alternative splicing events, producing a variety of transcripts from a single gene, which illustrated the extremely high complexity of transcriptome regulation. Comparative expression profile analysis of R2R3-MYB genes in soybean and Arabidopsis revealed that MYB genes play conserved and various roles in plants, which is indicative of a divergence in function. CONCLUSIONS In this study we identified the largest MYB gene family in plants known to date. Our findings indicate that members of this large gene family may be involved in different plant biological processes, some of which may be potentially involved in legume-specific nodulation. Our comparative genomics analysis provides a solid foundation for future functional dissection of this family gene.
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Affiliation(s)
- Hai Du
- Maize Research Institute, Sichuan Agricultural University, Chengdu Sichuan, China
- Key Laboratory of Biology and Genetic Improvement of Maize in Southwest Region, Maize Research Institute of Sichuan Agricultural University, Ministry of Agriculture, Chengdu Sichuan, China
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Si-Si Yang
- Maize Research Institute, Sichuan Agricultural University, Chengdu Sichuan, China
- Key Laboratory of Biology and Genetic Improvement of Maize in Southwest Region, Maize Research Institute of Sichuan Agricultural University, Ministry of Agriculture, Chengdu Sichuan, China
| | - Zhe Liang
- Department of Plant and Environmental Sciences, Norwegian University of Life Sciences, PO Box 5003N-1432, Norway
| | - Bo-Run Feng
- Maize Research Institute, Sichuan Agricultural University, Chengdu Sichuan, China
- Key Laboratory of Biology and Genetic Improvement of Maize in Southwest Region, Maize Research Institute of Sichuan Agricultural University, Ministry of Agriculture, Chengdu Sichuan, China
| | - Lei Liu
- Maize Research Institute, Sichuan Agricultural University, Chengdu Sichuan, China
| | - Yu-Bi Huang
- Maize Research Institute, Sichuan Agricultural University, Chengdu Sichuan, China
- Key Laboratory of Biology and Genetic Improvement of Maize in Southwest Region, Maize Research Institute of Sichuan Agricultural University, Ministry of Agriculture, Chengdu Sichuan, China
| | - Yi-Xiong Tang
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing, China
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Morohashi K, Casas MI, Ferreyra LF, Mejía-Guerra MK, Pourcel L, Yilmaz A, Feller A, Carvalho B, Emiliani J, Rodriguez E, Pellegrinet S, McMullen M, Casati P, Grotewold E. A genome-wide regulatory framework identifies maize pericarp color1 controlled genes. THE PLANT CELL 2012; 24:2745-64. [PMID: 22822204 PMCID: PMC3426112 DOI: 10.1105/tpc.112.098004] [Citation(s) in RCA: 117] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2012] [Revised: 06/10/2012] [Accepted: 07/02/2012] [Indexed: 05/18/2023]
Abstract
Pericarp Color1 (P1) encodes an R2R3-MYB transcription factor responsible for the accumulation of insecticidal flavones in maize (Zea mays) silks and red phlobaphene pigments in pericarps and other floral tissues, which makes P1 an important visual marker. Using genome-wide expression analyses (RNA sequencing) in pericarps and silks of plants with contrasting P1 alleles combined with chromatin immunoprecipitation coupled with high-throughput sequencing, we show here that the regulatory functions of P1 are much broader than the activation of genes corresponding to enzymes in a branch of flavonoid biosynthesis. P1 modulates the expression of several thousand genes, and ∼1500 of them were identified as putative direct targets of P1. Among them, we identified F2H1, corresponding to a P450 enzyme that converts naringenin into 2-hydroxynaringenin, a key branch point in the P1-controlled pathway and the first step in the formation of insecticidal C-glycosyl flavones. Unexpectedly, the binding of P1 to gene regulatory regions can result in both gene activation and repression. Our results indicate that P1 is the major regulator for a set of genes involved in flavonoid biosynthesis and a minor modulator of the expression of a much larger gene set that includes genes involved in primary metabolism and production of other specialized compounds.
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Affiliation(s)
- Kengo Morohashi
- Department of Molecular Genetics, The Ohio State
University, Columbus, Ohio 43210
- Center for Applied Plant Sciences, The Ohio State
University, Columbus, Ohio 43210
| | - María Isabel Casas
- Center for Applied Plant Sciences, The Ohio State
University, Columbus, Ohio 43210
- Molecular, Cellular, and Developmental Biology
Program, The Ohio State University, Columbus, Ohio 43210
| | - Lorena Falcone Ferreyra
- Centro de Estudios Fotosintéticos y
Bioquímicos, Universidad Nacional de Rosario, Santa Fe S2002LRK,
Argentina
| | - María Katherine Mejía-Guerra
- Center for Applied Plant Sciences, The Ohio State
University, Columbus, Ohio 43210
- Molecular, Cellular, and Developmental Biology
Program, The Ohio State University, Columbus, Ohio 43210
| | - Lucille Pourcel
- Department of Botany and Plant Biology, University of
Geneva, Geneva 1211, Switzerland
| | - Alper Yilmaz
- Center for Applied Plant Sciences, The Ohio State
University, Columbus, Ohio 43210
| | - Antje Feller
- Department of Food Quality and Nutrition, Instituto
Agrario San Michele all’Adige, 38010 San Michele all’Adige,
Italy
| | - Bruna Carvalho
- Center for Applied Plant Sciences, The Ohio State
University, Columbus, Ohio 43210
| | - Julia Emiliani
- Centro de Estudios Fotosintéticos y
Bioquímicos, Universidad Nacional de Rosario, Santa Fe S2002LRK,
Argentina
| | - Eduardo Rodriguez
- Instituto de Biología Molecular y Celular de
Rosario, Rosario, Santa Fe S2002LRK, Argentina
| | | | - Michael McMullen
- Plant Genetics Research Unit, U.S. Department of
Agriculture–Agricultural Research Service, University of Missouri,
Columbia, Missouri 65211
- Division of Plant Sciences, University of Missouri,
Columbia, Missouri 65211
| | - Paula Casati
- Centro de Estudios Fotosintéticos y
Bioquímicos, Universidad Nacional de Rosario, Santa Fe S2002LRK,
Argentina
| | - Erich Grotewold
- Department of Molecular Genetics, The Ohio State
University, Columbus, Ohio 43210
- Center for Applied Plant Sciences, The Ohio State
University, Columbus, Ohio 43210
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43
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Du H, Feng BR, Yang SS, Huang YB, Tang YX. The R2R3-MYB transcription factor gene family in maize. PLoS One 2012; 7:e37463. [PMID: 22719841 PMCID: PMC3370817 DOI: 10.1371/journal.pone.0037463] [Citation(s) in RCA: 187] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2011] [Accepted: 04/20/2012] [Indexed: 12/15/2022] Open
Abstract
MYB proteins comprise a large family of plant transcription factors, members of which perform a variety of functions in plant biological processes. To date, no genome-wide characterization of this gene family has been conducted in maize (Zea mays). In the present study, we performed a comprehensive computational analysis, to yield a complete overview of the R2R3-MYB gene family in maize, including the phylogeny, expression patterns, and also its structural and functional characteristics. The MYB gene structure in maize and Arabidopsis were highly conserved, indicating that they were originally compact in size. Subgroup-specific conserved motifs outside the MYB domain may reflect functional conservation. The genome distribution strongly supports the hypothesis that segmental and tandem duplication contribute to the expansion of maize MYB genes. We also performed an updated and comprehensive classification of the R2R3-MYB gene families in maize and other plant species. The result revealed that the functions were conserved between maize MYB genes and their putative orthologs, demonstrating the origin and evolutionary diversification of plant MYB genes. Species-specific groups/subgroups may evolve or be lost during evolution, resulting in functional divergence. Expression profile study indicated that maize R2R3-MYB genes exhibit a variety of expression patterns, suggesting diverse functions. Furthermore, computational prediction potential targets of maize microRNAs (miRNAs) revealed that miR159, miR319, and miR160 may be implicated in regulating maize R2R3-MYB genes, suggesting roles of these miRNAs in post-transcriptional regulation and transcription networks. Our comparative analysis of R2R3-MYB genes in maize confirm and extend the sequence and functional characteristics of this gene family, and will facilitate future functional analysis of the MYB gene family in maize.
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Affiliation(s)
- Hai Du
- Maize Research Institute, Sichuan Agricultural University, Chengdu, Sichuan, China
- Key Laboratory of Biology and Genetic Improvement of Maize in Southwest Region, Maize Research Institute of Sichuan Agricultural University, Ministry of Agriculture, Chengdu, Sichuan, China
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Bo-Run Feng
- Maize Research Institute, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Si-Si Yang
- Maize Research Institute, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Yu-Bi Huang
- Maize Research Institute, Sichuan Agricultural University, Chengdu, Sichuan, China
- Key Laboratory of Biology and Genetic Improvement of Maize in Southwest Region, Maize Research Institute of Sichuan Agricultural University, Ministry of Agriculture, Chengdu, Sichuan, China
- * E-mail: (YBH); (YXT)
| | - Yi-Xiong Tang
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing, China
- * E-mail: (YBH); (YXT)
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44
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Functional divergence of MYB-related genes, WEREWOLF and AtMYB23 in Arabidopsis. Biosci Biotechnol Biochem 2012; 76:883-7. [PMID: 22738953 DOI: 10.1271/bbb.110811] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Epidermal cell differentiation in Arabidopsis is studied as a model system to understand the mechanisms that determine the developmental end state of plant cells. MYB-related transcription factors are involved in cell fate determination. To examine the molecular basis of this process, we analyzed the functional relationship of two R2R3-type MYB genes, AtMYB23 (MYB23) and WEREWOLF (WER). MYB23 is involved in leaf trichome formation. WER represses root-hair formation. Swapping domains between MYB23 and WER, we found that a low homology region of MYB23 might be involved in ectopic trichome initiation on hypocotyls. MYB23 and all MYB23-WER (MW) chimeric transgenes rescued the increased root-hair phenotype of the wer-1 mutant. Although WER did not rescue the gl1-1 no-trichome phenotype, MYB23 and all MW chimeric transgenes rescued gl1-1. These results suggest that MYB23 acquired a specific function for trichome differentiation during evolution.
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45
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Kim JH, Kim BG, Ahn JH. Determination of the MYB Motif Interacting with WD40 and Basic Helix Loop Helix Proteins. ACTA ACUST UNITED AC 2012. [DOI: 10.3839/jabc.2011.061] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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46
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Gray J, Caparrós-Ruiz D, Grotewold E. Grass phenylpropanoids: regulate before using! PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2012; 184:112-20. [PMID: 22284715 DOI: 10.1016/j.plantsci.2011.12.008] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2011] [Revised: 12/06/2011] [Accepted: 12/09/2011] [Indexed: 05/18/2023]
Abstract
The phenylpropanoid pathway is responsible for the synthesis of lignin as well as a large number of compounds of fundamental importance for the biology of plants. Over the years, important knowledge has accumulated on how dicotyledoneous plants control various branches of phenylpropanoid accumulation, but comparable information on the grasses is lagging significantly behind. In addition to playing fundamental roles in biotic and abiotic interactions, phenylpropanoids in the grasses play a very important function in the reinforcement of cell wall components. Understanding how phenylpropanoid metabolism is controlled in the grasses has been complicated by recent genome duplications, the difficulties in making transgenic plants and the absence of mutants in many genes. Recent studies in a particular subgroup of R2R3-MYB transcription factors suggest that they might play a central role in regulating a small set of phenylpropanoid genes, opening the door for the identification of other related regulators, and perhaps also finding out which combinations of biosynthesis genes function in particular cell types for the formation of specific compounds. This information will be essential for the rational metabolic engineering of this pathway, either to increase biomass or decrease phenolic accumulation for better accessibility of polysaccharides for forage quality and biofuel production.
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Affiliation(s)
- John Gray
- Dept. Biological Sciences, University of Toledo, Toledo, OH 43606, USA
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47
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Tominaga-Wada R, Nukumizu Y, Wada T. Amino acid substitution converts WEREWOLF function from an activator to a repressor of Arabidopsis non-hair cell development. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2012; 183:37-42. [PMID: 22195575 DOI: 10.1016/j.plantsci.2011.11.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2011] [Revised: 09/28/2011] [Accepted: 11/02/2011] [Indexed: 05/31/2023]
Abstract
Root hair cell or non-hair cell fate determination in Arabidopsis thaliana root epidermis is model system for plant cell development. Two types of MYB transcription factors, the R2R3-type MYB, WEREWOLF (WER), and an R3-type MYB, CAPRICE (CPC), are involved in this cell fate determination process. To study the molecular basis of this process, we analyzed the functional relationship of WER and CPC. WER-CPC chimeric constructs were made from WER where all or parts of the MYB R3 region were replaced with the corresponding regions from CPC R3, and the constructs were introduced into the cpc-2 mutant. Although, the WER gene did not rescue the cpc-2 mutant 'small number of root hairs' phenotype, the WER-CPC chimera with two amino acids substitution (WC6) completely rescued the cpc-2 mutant phenotype. Furthermore, the WER-CPC chimera with 37 amino acids substitution (WC5) excessively rescued the cpc-2 mutant and induced 2.5 times more root hairs than wild-type. Consistent with this phenotype, GL2 gene expression was strongly reduced in WC5 in a cpc-2 background. Our results suggest that swapping at least two amino acids is sufficient to convert WER to CPC function. Therefore, these key residues may have strongly contributed to the selection of these important functions over evolution.
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Affiliation(s)
- Rumi Tominaga-Wada
- Interdisciplinary Research Organization, University of Miyazaki, 1-1, Gakuen Kibanadai-Nishi, Miyazaki 889-2192, Japan.
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48
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Du H, Feng BR, Yang SS, Huang YB, Tang YX. The R2R3-MYB transcription factor gene family in maize. PLoS One 2012. [PMID: 22719841 DOI: 10.3171/journal.pone.0037463] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/10/2023] Open
Abstract
MYB proteins comprise a large family of plant transcription factors, members of which perform a variety of functions in plant biological processes. To date, no genome-wide characterization of this gene family has been conducted in maize (Zea mays). In the present study, we performed a comprehensive computational analysis, to yield a complete overview of the R2R3-MYB gene family in maize, including the phylogeny, expression patterns, and also its structural and functional characteristics. The MYB gene structure in maize and Arabidopsis were highly conserved, indicating that they were originally compact in size. Subgroup-specific conserved motifs outside the MYB domain may reflect functional conservation. The genome distribution strongly supports the hypothesis that segmental and tandem duplication contribute to the expansion of maize MYB genes. We also performed an updated and comprehensive classification of the R2R3-MYB gene families in maize and other plant species. The result revealed that the functions were conserved between maize MYB genes and their putative orthologs, demonstrating the origin and evolutionary diversification of plant MYB genes. Species-specific groups/subgroups may evolve or be lost during evolution, resulting in functional divergence. Expression profile study indicated that maize R2R3-MYB genes exhibit a variety of expression patterns, suggesting diverse functions. Furthermore, computational prediction potential targets of maize microRNAs (miRNAs) revealed that miR159, miR319, and miR160 may be implicated in regulating maize R2R3-MYB genes, suggesting roles of these miRNAs in post-transcriptional regulation and transcription networks. Our comparative analysis of R2R3-MYB genes in maize confirm and extend the sequence and functional characteristics of this gene family, and will facilitate future functional analysis of the MYB gene family in maize.
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Affiliation(s)
- Hai Du
- Maize Research Institute, Sichuan Agricultural University, Chengdu, Sichuan, China
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49
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Pollastri S, Tattini M. Flavonols: old compounds for old roles. ANNALS OF BOTANY 2011; 108:1225-33. [PMID: 21880658 PMCID: PMC3197460 DOI: 10.1093/aob/mcr234] [Citation(s) in RCA: 185] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2011] [Accepted: 07/27/2011] [Indexed: 05/18/2023]
Abstract
BACKGROUND New roles for flavonoids, as developmental regulators and/or signalling molecules, have recently been proposed in eukaryotic cells exposed to a wide range of environmental stimuli. In plants, these functions are actually restricted to flavonols, the ancient and widespread class of flavonoids. In mosses and liverworts, the whole set of genes for flavonol biosynthesis - CHS, CHI, F3H, FLS and F3'H - has been detected. The flavonol branch pathway has remained intact for millions of years, and is almost exclusively involved in the responses of plants to a wide array of stressful agents, despite the fact that evolution of flavonoid metabolism has produced >10 000 structures. SCOPE Here the emerging functional roles of flavonoids in the responses of present-day plants to different stresses are discussed based on early, authoritative views of their primary functions during the colonization of land by plants. Flavonols are not as efficient as other secondary metabolites in absorbing wavelengths in the 290-320 nm spectral region, but display the greatest potential to keep stress-induced changes in cellular reactive oxygen species homeostasis under control, and to regulate the development of individual organs and the whole plant. Very low flavonol concentrations, as probably occurred in early terrestrial plants, may fully accomplish these regulatory functions. CONCLUSIONS During the last two decades the routine use of genomic, chromatography/mass spectrometry and fluorescence microimaging techniques has provided new insights into the regulation of flavonol metabolism as well as on the inter- and intracellular distribution of stress-responsive flavonols. These findings offer new evidence on how flavonols may have performed a wide array of functional roles during the colonization of land by plants. In our opinion this ancient flavonoid class is still playing the same old and robust roles in present-day plants.
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Affiliation(s)
- Susanna Pollastri
- Dipartimento di Scienze delle Produzioni Vegetali, del Suolo e dell'Ambiente Agroforestale, Sezione Coltivazioni Arboree, Università di Firenze, Viale delle Idee 30, I-50019, Sesto Fiorentino, Firenze, Italy
| | - Massimiliano Tattini
- Consiglio Nazionale delle Ricerche, Istituto per la Protezione delle Piante, Via Madonna del Piano, I-50019, Sesto Fiorentino, Firenze, Italy
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50
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Cai H, Tian S, Liu C, Dong H. Identification of a MYB3R gene involved in drought, salt and cold stress in wheat (Triticum aestivum L.). Gene 2011; 485:146-52. [DOI: 10.1016/j.gene.2011.06.026] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2010] [Revised: 06/12/2011] [Accepted: 06/18/2011] [Indexed: 01/15/2023]
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