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El-Sharkawy I, Sherif S, El Kayal W, Jones B, Li Z, Sullivan AJ, Jayasankar S. Overexpression of plum auxin receptor PslTIR1 in tomato alters plant growth, fruit development and fruit shelf-life characteristics. BMC PLANT BIOLOGY 2016; 16:56. [PMID: 26927309 PMCID: PMC4772300 DOI: 10.1186/s12870-016-0746-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2015] [Accepted: 02/26/2016] [Indexed: 05/20/2023]
Abstract
BACKGROUND TIR1-like proteins are F-box auxin receptors. Auxin binding to the F-box receptor proteins promotes the formation of SCF(TIR1) ubiquitin ligase complex that targets the auxin repressors, Aux/IAAs, for degradation via the ubiquitin/26S proteasome pathway. The release of auxin response factors (ARFs) from their Aux/IAA partners allows ARFs to mediate auxin-responsive changes in downstream gene transcription. In an attempt to understand the potential role of auxin during fruit development, a plum auxin receptor, PslTIR1, has previously been characterized at the cellular, biochemical and molecular levels, but the biological significance of this protein is still lacking. In the present study, tomato (Solanum lycopersicum) was used as a model to investigate the phenotypic and molecular changes associated with the overexpression of PslTIR1. RESULTS The findings of the present study highlighted the critical role of PslTIR1 as positive regulator of auxin-signalling in coordinating the development of leaves and fruits. This was manifested by the entire leaf morphology of transgenic tomato plants compared to the wild-type compound leaf patterning. Moreover, transgenic plants produced parthenocarpic fruits, a characteristic property of auxin hypersensitivity. The autocatalytic ethylene production associated with the ripening of climacteric fruits was not significantly altered in transgenic tomato fruits. Nevertheless, the fruit shelf-life characteristics were affected by transgene presence, mainly through enhancing fruit softening rate. The short shelf-life of transgenic tomatoes was associated with dramatic upregulation of several genes encoding proteins involved in cell-wall degradation, which determine fruit softening and subsequent fruit shelf-life. CONCLUSIONS The present study sheds light into the involvement of PslTIR1 in regulating leaf morphology, fruit development and fruit softening-associated ripening, but not autocatalytic ethylene production. The results demonstrate that auxin accelerates fruit softening independently of ethylene action and this is probably mediated through the upregulation of many cell-wall metabolism genes.
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Affiliation(s)
- I El-Sharkawy
- Department of Plant Agriculture, University of Guelph, Vineland Station, ON, Canada.
- Damanhour University, Faculty of Agriculture, Damanhour, Egypt.
| | - S Sherif
- Department of Plant Agriculture, University of Guelph, Vineland Station, ON, Canada.
- Damanhour University, Faculty of Agriculture, Damanhour, Egypt.
| | - W El Kayal
- Department of Plant Agriculture, University of Guelph, Vineland Station, ON, Canada.
| | - B Jones
- The University of Sydney, Faculty of Agriculture, Sydney, Australia.
| | - Z Li
- Chongqing University, Genetic Engineering Research Center, Bioengineering College, Chongqing, China.
| | - A J Sullivan
- Department of Plant Agriculture, University of Guelph, Guelph, ON, Canada.
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252
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Wei W, Hu Y, Cui MY, Han YT, Gao K, Feng JY. Identification and Transcript Analysis of the TCP Transcription Factors in the Diploid Woodland Strawberry Fragaria vesca. FRONTIERS IN PLANT SCIENCE 2016; 7:1937. [PMID: 28066489 PMCID: PMC5177655 DOI: 10.3389/fpls.2016.01937] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2016] [Accepted: 12/06/2016] [Indexed: 05/18/2023]
Abstract
Plant-specific TEOSINTE BRANCHED 1, CYCLOIDEA, and PROLIFERATING CELL FACTORS (TCP) transcription factors play versatile functions in multiple processes of plant growth and development. However, no systematic study has been performed in strawberry. In this study, 19 FvTCP genes were identified in the diploid woodland strawberry (Fragaria vesca) accession Heilongjiang-3. Phylogenetic analysis suggested that the FvTCP genes were classified into two main classes, with the second class further divided into two subclasses, which was supported by the exon-intron organizations and the conserved motif structures. Promoter analysis revealed various cis-acting elements related to growth and development, hormone and/or stress responses. We analyzed FvTCP gene transcript accumulation patterns in different tissues and fruit developmental stages. Among them, 12 FvTCP genes exhibited distinct tissue-specific transcript accumulation patterns. Eleven FvTCP genes were down-regulated in different fruit developmental stages, while five FvTCP genes were up-regulated. Transcripts of FvTCP genes also varied with different subcultural propagation periods and were induced by hormone treatments and biotic and abiotic stresses. Subcellular localization analysis showed that six FvTCP-GFP fusion proteins showed distinct localizations in Arabidopsis mesophyll protoplasts. Notably, transient over-expression of FvTCP9 in strawberry fruits dramatically affected the expression of a series of genes implicated in fruit development and ripening. Taken together, the present study may provide the basis for functional studies to reveal the role of this gene family in strawberry growth and development.
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Affiliation(s)
- Wei Wei
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Horticulture, Northwest A&F UniversityShaanxi, China
- Key Laboratory of Protected Horticulture Engineering in Northwest China, Ministry of AgricultureShaanxi, China
| | - Yang Hu
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Horticulture, Northwest A&F UniversityShaanxi, China
| | - Meng-Yuan Cui
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Horticulture, Northwest A&F UniversityShaanxi, China
- Key Laboratory of Protected Horticulture Engineering in Northwest China, Ministry of AgricultureShaanxi, China
| | - Yong-Tao Han
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Horticulture, Northwest A&F UniversityShaanxi, China
| | - Kuan Gao
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Horticulture, Northwest A&F UniversityShaanxi, China
- Key Laboratory of Protected Horticulture Engineering in Northwest China, Ministry of AgricultureShaanxi, China
| | - Jia-Yue Feng
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Horticulture, Northwest A&F UniversityShaanxi, China
- Key Laboratory of Protected Horticulture Engineering in Northwest China, Ministry of AgricultureShaanxi, China
- *Correspondence: Jia-Yue Feng,
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253
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Wang J, Dang Z, Zhang H, Zheng L, Borjigin T, Wang Y. Gene transcript profiles in the desert plant Nitraria tangutorum during fruit development and ripening. Mol Genet Genomics 2015; 291:383-98. [PMID: 26388259 DOI: 10.1007/s00438-015-1116-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2015] [Accepted: 09/04/2015] [Indexed: 11/26/2022]
Abstract
Nitraria tangutorum Bobr., a valuable wild shrub distributed in Northwest China, produces edible and medicinal berries. However, little is known about the molecular mechanisms of its fruit development and ripening. We performed de novo transcriptome sequencing of N. tangutorum fruit using the Illumina HiSeq™ 2000 sequencing platform. More than 62.94 million reads were obtained and assembled into 69,306 unigenes (average length, 587 bp). These unigenes were annotated by querying against five databases (Nr, Swiss-Prot, GO, COG, and KEGG); 42,929 and 26,809 unigenes were found in the Nr and Swiss-Prot databases, respectively. In ortholog analyses, 33,363 unigenes were assigned with one or more GO terms, 15,537 hits were aligned to 25 COG classes, and 24,592 unigenes were classified into 128 KEGG pathways. Digital gene expression analyses were conducted on N. tangutorum fruit at the green (S1), yellow (S2), and red (S3) developmental stages. In total, 8240, 5985, and 4994 differentially expressed genes (DEGs) were detected for S1 vs. S2, S1 vs. S3, and S2 vs. S3, respectively. Cluster analyses showed that a large proportion of DEGs related to plant hormones and transcription factors (TFs) showed high expression in S1, down-regulated expression in S2, and up-regulated expression in S3. We analyzed the expression patterns of 23 genes encoding 12 putative enzymes involved in flavonoid biosynthesis. The expression profiles of 10 DEGs involved in flavonoid biosynthesis were validated by Q-PCR analysis. The assembled and annotated transcriptome sequences and gene expression profile analyses provide valuable genetic resources for research on N. tangutorum.
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Affiliation(s)
- Jia Wang
- College of Life Sciences, Inner Mongolia University, Hohhot, 010021, People's Republic of China
| | - Zhenhua Dang
- College of Life Sciences, Inner Mongolia University, Hohhot, 010021, People's Republic of China
| | - Huirong Zhang
- College of Life Sciences, Inner Mongolia University, Hohhot, 010021, People's Republic of China
| | - Linlin Zheng
- College of Life Sciences, Inner Mongolia University, Hohhot, 010021, People's Republic of China
| | - Tebuqin Borjigin
- College of Life Sciences, Inner Mongolia University, Hohhot, 010021, People's Republic of China
- College of Mongolian Medicine, Inner Mongolia Medical University, Hohhot, 010110, People's Republic of China
| | - Yingchun Wang
- College of Life Sciences, Inner Mongolia University, Hohhot, 010021, People's Republic of China.
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254
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Tohge T, Fernie AR. Metabolomics-Inspired Insight into Developmental, Environmental and Genetic Aspects of Tomato Fruit Chemical Composition and Quality. PLANT & CELL PHYSIOLOGY 2015; 56:1681-96. [PMID: 26228272 DOI: 10.1093/pcp/pcv093] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2015] [Accepted: 06/12/2015] [Indexed: 05/20/2023]
Abstract
Tomato was one of the first plant species to be evaluated using metabolomics and remains one of the best characterized, with tomato fruit being both an important source of nutrition in the human diet and a valuable model system for the development of fleshy fruits. Additionally, given the broad habitat range of members of the tomato clade and the extensive use of exotic germplasm in tomato genetic research, it represents an excellent genetic model system for understanding both metabolism per se and the importance of various metabolites in conferring stress tolerance. This review summarizes technical approaches used to characterize the tomato metabolome to date and details insights into metabolic pathway structure and regulation that have been obtained via analysis of tissue samples taken under different developmental or environmental circumstance as well as following genetic perturbation. Particular attention is paid to compounds of importance for nutrition or the shelf-life of tomatoes. We propose furthermore how metabolomics information can be coupled to the burgeoning wealth of genome sequence data from the tomato clade to enhance further our understanding of (i) the shifts in metabolic regulation occurring during development and (ii) specialization of metabolism within the tomato clade as a consequence of either adaptive evolution or domestication.
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Affiliation(s)
- Takayuki Tohge
- Max-Planck-Institute of Molecular Plant Physiology, Am Mühlenberg 1, D-14476 Potsdam-Golm, Germany
| | - Alisdair R Fernie
- Max-Planck-Institute of Molecular Plant Physiology, Am Mühlenberg 1, D-14476 Potsdam-Golm, Germany
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255
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Huang W, Xian Z, Kang X, Tang N, Li Z. Genome-wide identification, phylogeny and expression analysis of GRAS gene family in tomato. BMC PLANT BIOLOGY 2015; 15:209. [PMID: 26302743 PMCID: PMC4549011 DOI: 10.1186/s12870-015-0590-6] [Citation(s) in RCA: 123] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Accepted: 08/11/2015] [Indexed: 05/20/2023]
Abstract
BACKGROUND GRAS transcription factors usually act as integrators of multiple growth regulatory and environmental signals, including axillary shoot meristem formation, root radial pattering, phytohormones, light signaling, and abiotic/biotic stress. However, little is known about this gene family in tomato (Solanum lycopersicum), the most important model plant for crop species with fleshy fruits. RESULTS In this study, 53 GRAS genes were identified and renamed based on tomato whole-genome sequence and their respective chromosome distribution except 19 members were kept as their already existed name. Multiple sequence alignment showed typical GRAS domain in these proteins. Phylogenetic analysis of GRAS proteins from tomato, Arabidopsis, Populus, P.mume, and Rice revealed that SlGRAS proteins could be divided into at least 13 subfamilies. SlGRAS24 and SlGRAS40 were identified as target genes of miR171 using5'-RACE (Rapid amplification of cDNA ends). qRT-PCR analysis revealed tissue-/organ- and development stage-specific expression patterns of SlGRAS genes. Moreover, their expression patterns in response to different hormone and abiotic stress treatments were also investigated. CONCLUSIONS This study provides the first comprehensive analysis of GRAS gene family in the tomato genome. The data will undoubtedly be useful for better understanding the potential functions of GRAS genes, and their possible roles in mediating hormone cross-talk and abiotic stress in tomato as well as in some other relative species.
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Affiliation(s)
- Wei Huang
- Genetic Engineering Research Center, School of Life Sciences, Chongqing University, Chongqing, 400044, People's Republic China.
| | - Zhiqiang Xian
- Genetic Engineering Research Center, School of Life Sciences, Chongqing University, Chongqing, 400044, People's Republic China.
| | - Xia Kang
- Genetic Engineering Research Center, School of Life Sciences, Chongqing University, Chongqing, 400044, People's Republic China.
| | - Ning Tang
- Genetic Engineering Research Center, School of Life Sciences, Chongqing University, Chongqing, 400044, People's Republic China.
| | - Zhengguo Li
- Genetic Engineering Research Center, School of Life Sciences, Chongqing University, Chongqing, 400044, People's Republic China.
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256
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Fortes AM, Teixeira RT, Agudelo-Romero P. Complex Interplay of Hormonal Signals during Grape Berry Ripening. Molecules 2015; 20:9326-43. [PMID: 26007186 PMCID: PMC6272489 DOI: 10.3390/molecules20059326] [Citation(s) in RCA: 78] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2015] [Revised: 05/15/2015] [Accepted: 05/18/2015] [Indexed: 11/16/2022] Open
Abstract
Grape and wine production and quality is extremely dependent on the fruit ripening process. Sensory and nutritional characteristics are important aspects for consumers and their development during fruit ripening involves complex hormonal control. In this review, we explored data already published on grape ripening and compared it with the hormonal regulation of ripening of other climacteric and non-climacteric fruits. The roles of abscisic acid, ethylene, and brassinosteroids as promoters of ripening are discussed, as well as the role of auxins, cytokinins, gibberellins, jasmonates, and polyamines as inhibitors of ripening. In particular, the recently described role of polyamine catabolism in grape ripening is discussed, together with its putative interaction with other hormones. Furthermore, other recent examples of cross-talk among the different hormones are presented, revealing a complex interplay of signals during grape development and ripening.
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Affiliation(s)
- Ana Margarida Fortes
- BioISI, Faculdade de Ciências de Lisboa, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal.
- Instituto de Tecnologia de Química Biológica (ITQB), Biotecnologia de Células Vegetais, Av. da República, 2781-157 Oeiras, Portugal.
| | - Rita Teresa Teixeira
- BioISI, Faculdade de Ciências de Lisboa, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
| | - Patricia Agudelo-Romero
- BioISI, Faculdade de Ciências de Lisboa, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
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257
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Azzi L, Deluche C, Gévaudant F, Frangne N, Delmas F, Hernould M, Chevalier C. Fruit growth-related genes in tomato. JOURNAL OF EXPERIMENTAL BOTANY 2015; 66:1075-86. [PMID: 25573859 DOI: 10.1093/jxb/eru527] [Citation(s) in RCA: 86] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Tomato (Solanum lycopersicum Mill.) represents a model species for all fleshy fruits due to its biological cycle and the availability of numerous genetic and molecular resources. Its importance in human nutrition has made it one of the most valuable worldwide commodities. Tomato fruit size results from the combination of cell number and cell size, which are determined by both cell division and expansion. As fruit growth is mainly driven by cell expansion, cells from the (fleshy) pericarp tissue become highly polyploid according to the endoreduplication process, reaching a DNA content rarely encountered in other plant species (between 2C and 512C). Both cell division and cell expansion are under the control of complex interactions between hormone signalling and carbon partitioning, which establish crucial determinants of the quality of ripe fruit, such as the final size, weight, and shape, and organoleptic and nutritional traits. This review describes the genes known to contribute to fruit growth in tomato.
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Affiliation(s)
- Lamia Azzi
- University of Bordeaux, UMR1332 Biologie du Fruit et Pathologie, INRA Bordeaux Aquitaine, CS20032, F-33882 Villenave d'Ornon cedex, France
| | - Cynthia Deluche
- University of Bordeaux, UMR1332 Biologie du Fruit et Pathologie, INRA Bordeaux Aquitaine, CS20032, F-33882 Villenave d'Ornon cedex, France
| | - Frédéric Gévaudant
- University of Bordeaux, UMR1332 Biologie du Fruit et Pathologie, INRA Bordeaux Aquitaine, CS20032, F-33882 Villenave d'Ornon cedex, France
| | - Nathalie Frangne
- University of Bordeaux, UMR1332 Biologie du Fruit et Pathologie, INRA Bordeaux Aquitaine, CS20032, F-33882 Villenave d'Ornon cedex, France
| | - Frédéric Delmas
- University of Bordeaux, UMR1332 Biologie du Fruit et Pathologie, INRA Bordeaux Aquitaine, CS20032, F-33882 Villenave d'Ornon cedex, France
| | - Michel Hernould
- University of Bordeaux, UMR1332 Biologie du Fruit et Pathologie, INRA Bordeaux Aquitaine, CS20032, F-33882 Villenave d'Ornon cedex, France
| | - Christian Chevalier
- INRA, UMR1332 Biologie du Fruit et Pathologie, INRA Bordeaux Aquitaine, CS20032, F-33882, Villenave d'Ornon cedex, France
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258
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Weng L, Zhao F, Li R, Xiao H. Cross-talk modulation between ABA and ethylene by transcription factor SlZFP2 during fruit development and ripening in tomato. PLANT SIGNALING & BEHAVIOR 2015; 10:e1107691. [PMID: 26492077 PMCID: PMC4854345 DOI: 10.1080/15592324.2015.1107691] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2015] [Revised: 10/09/2015] [Accepted: 10/09/2015] [Indexed: 05/22/2023]
Abstract
The stress hormone ABA not only regulates stress response, but is also required for plant development and growth. Some evidences indicate that ABA plays a pivotal role in the ripening process of non climacteric as well as climacteric fruits. In a recent study, we showed that the tomato (Solanum lycopersicum) transcription factor SlZFP2 fine tunes ABA biosynthesis during fruit development through direct suppression of ABA biosynthetic genes and it also regulates fruit ripening through transcriptional suppression of the ripening regulator CNR. This indicates that SlZFP2 likely modulates the cross-talk between ABA and ethylene in regulation of fruit development and ripening in tomato. Gene expression analysis using ABA deficient mutants sit and flc as well as the SlZFP2 RNAi lines of high fruit ABA production showed that ethylene biosynthetic genes LeACS1A, LeACS1 and LeACO1 were positively regulated by ABA during early fruit growth. We reason that ABA promotes basal ethylene biosynthesis in system 1 during fruit growth and likely plays a minor role in ripening regulation after the onset of ripening process.
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Affiliation(s)
- Lin Weng
- National Key Laboratory of Plant Molecular Genetics; Institute of Plant Physiology and Ecology; Shanghai Institutes for Biological Sciences; Chinese Academy of Sciences; Shanghai, China
| | - Fangfang Zhao
- National Key Laboratory of Plant Molecular Genetics; Institute of Plant Physiology and Ecology; Shanghai Institutes for Biological Sciences; Chinese Academy of Sciences; Shanghai, China
| | - Rong Li
- National Key Laboratory of Plant Molecular Genetics; Institute of Plant Physiology and Ecology; Shanghai Institutes for Biological Sciences; Chinese Academy of Sciences; Shanghai, China
| | - Han Xiao
- National Key Laboratory of Plant Molecular Genetics; Institute of Plant Physiology and Ecology; Shanghai Institutes for Biological Sciences; Chinese Academy of Sciences; Shanghai, China
- Correspondence to: Han Xiao;
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259
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Seymour GB, Granell A. Fruit development and ripening. JOURNAL OF EXPERIMENTAL BOTANY 2014; 65:4489-90. [PMID: 25221812 PMCID: PMC4115256 DOI: 10.1093/jxb/eru307] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
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260
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Karlova R, Chapman N, David K, Angenent GC, Seymour GB, de Maagd RA. Transcriptional control of fleshy fruit development and ripening. JOURNAL OF EXPERIMENTAL BOTANY 2014; 65:4527-41. [PMID: 25080453 DOI: 10.1093/jxb/eru316] [Citation(s) in RCA: 192] [Impact Index Per Article: 19.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Fleshy fruits have evolved to be attractive to frugivores in order to enhance seed dispersal, and have become an indispensable part of the human diet. Here we review the recent advances in the understanding of transcriptional regulation of fleshy fruit development and ripening with a focus on tomato. While aspects of fruit development are probably conserved throughout the angiosperms, including the model plant Arabidopsis thaliana, it is shown that the likely orthologues of Arabidopsis genes have distinct functions in fleshy fruits. The model for the study of fleshy fruit development is tomato, because of the availability of single gene mutants and transgenic knock-down lines. In other species, our knowledge is often incomplete or absent. Tomato fruit size and shape are co-determined by transcription factors acting during formation of the ovary. Other transcription factors play a role in fruit chloroplast formation, and upon ripening impact quality aspects such as secondary metabolite content. In tomato, the transcription factors NON-RIPENING (NOR), COLORLESS NON-RIPENING (CNR), and RIPENING INHIBITOR (MADS-RIN) in concert with ethylene signalling regulate ripening, possibly in response to a developmental switch. Additional components include TOMATO AGAMOUS-LIKE1 (TAGL1), APETALA2a (AP2a), and FRUITFULL (FUL1 and FUL2). The links between this highly connected regulatory network and downstream effectors modulating colour, texture, and flavour are still relatively poorly understood. Intertwined with this network is post-transcriptional regulation by fruit-expressed microRNAs targeting several of these transcription factors. This important developmental process is also governed by changes in DNA methylation levels and possibly chromatin remodelling.
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Affiliation(s)
- Rumyana Karlova
- Molecular Plant Physiology, Utrecht University, 3584 CH Utrecht, The Netherlands Laboratory of Molecular Biology, Wageningen University, 6700 ET Wageningen, The Netherlands
| | - Natalie Chapman
- Plant and Crop Science Division, School of Biosciences, University of Nottingham, Loughborough LE12 5RD, UK
| | - Karine David
- University of Auckland, School of Biological Sciences, Auckland, New Zealand
| | - Gerco C Angenent
- Laboratory of Molecular Biology, Wageningen University, 6700 ET Wageningen, The Netherlands Business Unit Bioscience, Plant Research International, 6700 AP Wageningen, The Netherlands
| | - Graham B Seymour
- Plant and Crop Science Division, School of Biosciences, University of Nottingham, Loughborough LE12 5RD, UK
| | - Ruud A de Maagd
- Business Unit Bioscience, Plant Research International, 6700 AP Wageningen, The Netherlands Chair group Bioinformatics, Wageningen University, 6700 ET Wageningen, The Netherlands
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