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Jia C, Shi Y, Wang H, Zhang Y, Luo F, Li Z, Tian Y, Lu X, Pei Z. Genome-wide identification and expression analysis of SMALL AUXIN UP RNA ( SAUR) genes in rice ( Oryza sativa). PLANT SIGNALING & BEHAVIOR 2024; 19:2391658. [PMID: 39148317 PMCID: PMC11328882 DOI: 10.1080/15592324.2024.2391658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Revised: 11/11/2023] [Accepted: 11/16/2023] [Indexed: 08/17/2024]
Abstract
SMALL AUXIN UP RNAs (SAURs), the largest family of early auxin response genes, plays crucial roles in multiple processes, including cell expansion, leaf growth and senescence, auxin transport, tropic growth and so on. Although the rice SAUR gene family was identified in 2006, it is necessary to identify the rice SAUR gene due to the imperfection of its analysis methods. In this study, a total of 60 OsSAURs (including two pseudogenes) distributed on 10 chromosomes were identified in rice (Oryza sativa). Bioinformatics tools were used to systematically analyze the physicochemical properties, subcellular localization, motif compositions, chromosomal location, gene duplication, evolutionary relationships, auxin-responsive cis-elements of the OsSAURs. In addition, the expression profiles obtained from microarray data analysis showed that OsSAUR genes had different expression patterns in different tissues and responded to auxin treatment, indicating functional differences among members of OsSAUR gene family. In a word, this study provides basic information for SAUR gene family of rice and lays a foundation for further study on the role of SAUR in rice growth and development.
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Affiliation(s)
- Chenhao Jia
- Tianjin Key Laboratory of Intelligent Breeding of Major Crops, College of Agronomy & Resources and Environment, Tianjin Agricultural University, Tianjin, China
| | - Yujiao Shi
- Tianjin Key Laboratory of Intelligent Breeding of Major Crops, College of Agronomy & Resources and Environment, Tianjin Agricultural University, Tianjin, China
| | - Hao Wang
- Tianjin Key Laboratory of Intelligent Breeding of Major Crops, College of Agronomy & Resources and Environment, Tianjin Agricultural University, Tianjin, China
| | - Yaofang Zhang
- College of Basic Sciences, Tianjin Agricultural University, Tianjin, China
| | - Feng Luo
- Tianjin Key Laboratory of Intelligent Breeding of Major Crops, College of Agronomy & Resources and Environment, Tianjin Agricultural University, Tianjin, China
| | - Zhibin Li
- Tianjin Key Laboratory of Intelligent Breeding of Major Crops, College of Agronomy & Resources and Environment, Tianjin Agricultural University, Tianjin, China
| | - Yubing Tian
- Tianjin Key Laboratory of Intelligent Breeding of Major Crops, College of Agronomy & Resources and Environment, Tianjin Agricultural University, Tianjin, China
| | - Xiangrui Lu
- Tianjin Key Laboratory of Intelligent Breeding of Major Crops, College of Agronomy & Resources and Environment, Tianjin Agricultural University, Tianjin, China
| | - Zhongyou Pei
- Tianjin Key Laboratory of Intelligent Breeding of Major Crops, College of Agronomy & Resources and Environment, Tianjin Agricultural University, Tianjin, China
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Li XM, Zhai HH, An XH, Zhang H, Zhang X, Wang P, Chen H, Tian Y. PpSAUR5 promotes plant growth by regulating lignin and hormone pathways. FRONTIERS IN PLANT SCIENCE 2024; 15:1291693. [PMID: 38984157 PMCID: PMC11231374 DOI: 10.3389/fpls.2024.1291693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/10/2023] [Accepted: 05/08/2024] [Indexed: 07/11/2024]
Abstract
Introduction Peach (Prunus persica) has a high nutritional and economic value. However, its overgrowth can lead to yield loss. Regulating the growth of peach trees is challenging. The small auxin-up RNA (SAUR) gene family is the largest family of auxin-responsive genes, which play important roles in plant growth and development. However, members of this gene family are rarely reported in peach. Methods In this study, we measured leaf area, chlorophyll and lignin content to detect the role of PpSAUR5 on growth through transgenic Arabidopsis. Results PpSAUR5 responds to auxin and gibberellin, promoting and inhibiting the synthesis of gibberellin and auxin, respectively. The heterologous transformation of PpSAUR5 in Arabidopsis led to enhanced growth of leaves and siliques, lightening of leaf color, decrease in chlorophyll content, increase in lignin content, abnormalities in the floral organs, and distortion of the inflorescence axis. Transcriptome data analysis of PpSAUR5 overexpression and wild-type lines revealed 854 differentially expressed genes (DEGs). GO and KEGG analyses showed that the DEGs were primarily involved in biological processes, such as cellular processes, metabolic processes, response to stimuli, and catalytic activity. These genes were mainly enriched in pathways, such as phenylalanine biosynthesis, phytohormone signaling, and MAPK signaling. Discussion In summary, these results suggested that PpSAUR5 might regulate tree vigor by modulating the synthesis of auxin and gibberellin. Future studies can use PpSAUR5 as a candidate gene to elucidate the potential regulatory mechanisms underlying peach tree vigor.
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Affiliation(s)
- Xin-Miao Li
- College of Horticulture, Hebei Agricultural University, Baoding, Hebei, China
| | - Han-Han Zhai
- College of Horticulture, Hebei Agricultural University, Baoding, Hebei, China
| | - Xiu-Hong An
- National Engineering Research Center for Agriculture in Northern Moutainous Areas, Agricultural Technology Innovation Center in Mountainous Areas of Hebei Province, Hebei Agricultural University, Baoding, Hebei, China
| | - He Zhang
- College of Horticulture, Hebei Agricultural University, Baoding, Hebei, China
| | - Xueying Zhang
- College of Horticulture, Hebei Agricultural University, Baoding, Hebei, China
| | - Pengfei Wang
- College of Horticulture, Hebei Agricultural University, Baoding, Hebei, China
| | - Haijiang Chen
- College of Horticulture, Hebei Agricultural University, Baoding, Hebei, China
| | - Yi Tian
- National Engineering Research Center for Agriculture in Northern Moutainous Areas, Agricultural Technology Innovation Center in Mountainous Areas of Hebei Province, Hebei Agricultural University, Baoding, Hebei, China
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Zhu Z, Chen D, Sun M, Xiao M, Huang P, Ren D, Yang Y, Zhang Z, Zhao Q, Li R. Integrative analysis of the metabolome and transcriptome provides insights into the mechanisms of lignan biosynthesis in Herpetospermum pedunculosum (Cucurbitaceae). BMC Genomics 2024; 25:421. [PMID: 38684979 PMCID: PMC11059704 DOI: 10.1186/s12864-024-10306-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2024] [Accepted: 04/12/2024] [Indexed: 05/02/2024] Open
Abstract
BACKGROUND Herpetospermum pedunculosum (Ser.) C. B. Clarke is a traditional Chinese herbal medicine that heavily relies on the lignans found in its dried ripe seeds (Herpetospermum caudigerum), which have antioxidant and hepatoprotective functions. However, little is known regarding the lignan biosynthesis in H. pedunculosum. In this study, we used metabolomic (non-targeted UHPLC-MS/MS) and transcriptome (RNA-Seq) analyses to identify key metabolites and genes (both structural and regulatory) associated with lignan production during the green mature (GM) and yellow mature (YM) stages of H. pedunculosum. RESULTS The contents of 26 lignan-related metabolites and the expression of 30 genes involved in the lignan pathway differed considerably between the GM and YM stages; most of them were more highly expressed in YM than in GM. UPLC-Q-TOF/MS confirmed that three Herpetospermum-specific lignans (including herpetrione, herpetotriol, and herpetin) were found in YM, but were not detected in GM. In addition, we proposed a lignan biosynthesis pathway for H. pedunculosum based on the fundamental principles of chemistry and biosynthesis. An integrated study of the transcriptome and metabolome identified several transcription factors, including HpGAF1, HpHSFB3, and HpWOX1, that were highly correlated with the metabolism of lignan compounds during seed ripening. Furthermore, functional validation assays revealed that the enzyme 4-Coumarate: CoA ligase (4CL) catalyzes the synthesis of hydroxycinnamate CoA esters. CONCLUSION These results will deepen our understanding of seed lignan biosynthesis and establish a theoretical basis for molecular breeding of H. pedunculosum.
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Affiliation(s)
- Ziwei Zhu
- Engineering Research Center of Sichuan-Tibet Traditional Medicinal Plant, Chengdu University, 610106, Chengdu, China
- Institute for Advanced Study, Chengdu University, 610106, Chengdu, China
| | - Daihan Chen
- Pharmacy College, Chengdu University of Traditional Chinese Medicine, 611137, Chengdu, China
| | - Min Sun
- Engineering Research Center of Sichuan-Tibet Traditional Medicinal Plant, Chengdu University, 610106, Chengdu, China
- Institute for Advanced Study, Chengdu University, 610106, Chengdu, China
| | - Maotao Xiao
- Engineering Research Center of Sichuan-Tibet Traditional Medicinal Plant, Chengdu University, 610106, Chengdu, China
- School of Food and Biological Engineering, Chengdu University, 610106, Chengdu, China
| | - Peng Huang
- Tibet Rhodiola Pharmaceutical Holding Company, 850000, Lhasa, China
| | - Dongsheng Ren
- Tibet Rhodiola Pharmaceutical Holding Company, 850000, Lhasa, China
| | - Yixi Yang
- Engineering Research Center of Sichuan-Tibet Traditional Medicinal Plant, Chengdu University, 610106, Chengdu, China
- School of Food and Biological Engineering, Chengdu University, 610106, Chengdu, China
| | - Zhen Zhang
- Engineering Research Center of Sichuan-Tibet Traditional Medicinal Plant, Chengdu University, 610106, Chengdu, China
- School of Food and Biological Engineering, Chengdu University, 610106, Chengdu, China
| | - Qi Zhao
- Engineering Research Center of Sichuan-Tibet Traditional Medicinal Plant, Chengdu University, 610106, Chengdu, China.
- Pharmacy College, Chengdu University of Traditional Chinese Medicine, 611137, Chengdu, China.
- School of Food and Biological Engineering, Chengdu University, 610106, Chengdu, China.
| | - Rui Li
- Engineering Research Center of Sichuan-Tibet Traditional Medicinal Plant, Chengdu University, 610106, Chengdu, China.
- School of Food and Biological Engineering, Chengdu University, 610106, Chengdu, China.
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Sun J, Zheng Y, Guo J, Zhang Y, Liu Y, Tao Y, Wang M, Liu T, Liu Y, Li X, Zhang X, Zhao L. GmGAMYB-BINDING PROTEIN 1 promotes small auxin-up RNA gene transcription to modulate soybean maturity and height. PLANT PHYSIOLOGY 2023; 193:775-791. [PMID: 37204820 DOI: 10.1093/plphys/kiad293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Revised: 04/13/2023] [Accepted: 04/26/2023] [Indexed: 05/20/2023]
Abstract
Flowering time, maturity, and plant height are crucial agronomic traits controlled by photoperiod that affect soybean (Glycine max [L.] Merr.) yield and regional adaptability. It is important to cultivate soybean cultivars of earlier maturity that adapt to high latitudes. GAMYB-binding protein 1 (GmGBP1), a member of the SNW/SKIP family of transcriptional coregulators in soybean, is induced by short days and interacts with transcription factor GAMYB (GmGAMYB) during photoperiod control of flowering time and maturity. In the present study, GmGBP1:GmGBP1 soybean showed the phenotypes of earlier maturity and higher plant height. Chromatin immunoprecipitation sequencing (ChIP-seq) assays of GmGBP1-binding sites and RNA sequencing (RNA-seq) of differentially expressed transcripts in GmGBP1:GmGBP1 further identified potential targets of GmGBP1, including small auxin-up RNA (GmSAUR). GmSAUR:GmSAUR soybean also showed earlier maturity and higher plant height. GmGBP1 interacted with GmGAMYB, bound to the promoter of GmSAUR and promoted the expression of FLOWER LOCUS T homologs 2a (GmFT2a) and FLOWERING LOCUS D LIKE 19 (GmFDL19). Flowering repressors such as GmFT4 were negatively regulated, resulting in earlier flowering and maturity. Furthermore, the interaction of GmGBP1 with GmGAMYB increased the gibberellin (GA) signal to promote height and hypocotyl elongation by activating GmSAUR and GmSAUR bound to the promoter of the GA-positive activating regulator gibberellic acid-stimulated Arabidopsis 32 (GmGASA32). These results suggested a photoperiod regulatory pathway in which the interaction of GmGBP1 with GmGAMYB directly activated GmSAUR to promote earlier maturity and plant height in soybean.
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Affiliation(s)
- Jingzhe Sun
- Key Laboratory of Soybean Biology of Ministry of Education China, Northeast Agricultural University, Harbin 150030, China
| | - Yuhong Zheng
- Key Laboratory of Soybean Biology of Ministry of Education China, Northeast Agricultural University, Harbin 150030, China
| | - Jinpeng Guo
- Key Laboratory of Soybean Biology of Ministry of Education China, Northeast Agricultural University, Harbin 150030, China
| | - Yuntong Zhang
- Key Laboratory of Soybean Biology of Ministry of Education China, Northeast Agricultural University, Harbin 150030, China
| | - Ying Liu
- Key Laboratory of Soybean Biology of Ministry of Education China, Northeast Agricultural University, Harbin 150030, China
| | - Yahan Tao
- Key Laboratory of Soybean Biology of Ministry of Education China, Northeast Agricultural University, Harbin 150030, China
| | - Mengyuan Wang
- Key Laboratory of Soybean Biology of Ministry of Education China, Northeast Agricultural University, Harbin 150030, China
| | - Tianmeng Liu
- Key Laboratory of Soybean Biology of Ministry of Education China, Northeast Agricultural University, Harbin 150030, China
| | - Yangyang Liu
- Key Laboratory of Soybean Biology of Ministry of Education China, Northeast Agricultural University, Harbin 150030, China
| | - Xin Li
- Key Laboratory of Soybean Biology of Ministry of Education China, Northeast Agricultural University, Harbin 150030, China
| | | | - Lin Zhao
- Key Laboratory of Soybean Biology of Ministry of Education China, Northeast Agricultural University, Harbin 150030, China
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Qiu T, Qi M, Ding X, Zheng Y, Zhou T, Chen Y, Han N, Zhu M, Bian H, Wang J. The SAUR41 subfamily of SMALL AUXIN UP RNA genes is abscisic acid inducible to modulate cell expansion and salt tolerance in Arabidopsis thaliana seedlings. ANNALS OF BOTANY 2020; 125:805-819. [PMID: 31585004 PMCID: PMC7182593 DOI: 10.1093/aob/mcz160] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Accepted: 10/02/2019] [Indexed: 05/22/2023]
Abstract
BACKGROUND AND AIMS Most primary auxin response genes are classified into three families: AUX/IAA, GH3 and SAUR genes. Few studies have been conducted on Arabidopsis thaliana SAUR genes, possibly due to genetic redundancy among different subfamily members. Data mining on arabidopsis transcriptional profiles indicates that the SAUR41 subfamily members of SMALL AUXIN UP RNA genes are, strikingly, induced by an inhibitory phytohormone, abscisic acid (ABA). We aimed to reveal the physiological roles of arabidopsis SAUR41 subfamily genes containing SAUR40, SAUR41, SAUR71 and SAUR72. METHODS Transcriptional responses of arabidopsis SAUR41 genes to phytohormones were determined by quantitative real-time PCR. Knock out of SAUR41 genes was carried out with the CRISPR/Cas9 (clustered regulatory interspaced short palindromic repeats/CRISPR-associated protein 9) genome editing technique. The saur41/40/71/72 quadruple mutants, SAUR41 overexpression lines and the wild type were subjected to ultrastructural observation, transcriptome analysis and physiological characterization. KEY RESULTS Transcription of arabidopsis SAUR41 subfamily genes is activated by ABA but not by gibberellic acids and brassinosteroids. Quadruple mutations in saur41/40/71/72 led to reduced cell expansion/elongation in cotyledons and hypocotyls, opposite to the overexpression of SAUR41; however, an irregular arrangement of cell size and shape was observed in both cases. The quadruple mutants had increased transcription of calcium homeostasis/signalling genes in seedling shoots, and the SAUR41 overexpression lines had decreased transcription of iron homeostasis genes in roots and increased ABA biosynthesis in shoots. Notably, both the quadruple mutants and the SAUR41 overexpression lines were hypersensitive to salt stress during seedling establishment, whereas specific expression of SAUR41 under the ABA-responsive RD29A (Responsive to Desiccation 29A) promoter in the quadruple mutants rescued the inhibitory effect of salt stress. CONCLUSIONS The SAUR41 subfamily genes of arabidopsis are ABA inducible to modulate cell expansion, ion homeostasis and salt tolerance. Our work may provide new candidate genes for improvement of plant abiotic stress tolerance.
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Affiliation(s)
- Ting Qiu
- Institute of Genetics and Regenerative Biology, College of Life Sciences, Zhejiang University, Hangzhou, China
| | - Mengyuan Qi
- Institute of Genetics and Regenerative Biology, College of Life Sciences, Zhejiang University, Hangzhou, China
| | - Xiaohui Ding
- Institute of Genetics and Regenerative Biology, College of Life Sciences, Zhejiang University, Hangzhou, China
| | - Yanyan Zheng
- Institute of Genetics and Regenerative Biology, College of Life Sciences, Zhejiang University, Hangzhou, China
| | - Tianjiao Zhou
- Institute of Genetics and Regenerative Biology, College of Life Sciences, Zhejiang University, Hangzhou, China
| | - Yong Chen
- Institute of Genetics and Regenerative Biology, College of Life Sciences, Zhejiang University, Hangzhou, China
| | - Ning Han
- Institute of Genetics and Regenerative Biology, College of Life Sciences, Zhejiang University, Hangzhou, China
| | - Muyuan Zhu
- Institute of Genetics and Regenerative Biology, College of Life Sciences, Zhejiang University, Hangzhou, China
| | - Hongwu Bian
- Institute of Genetics and Regenerative Biology, College of Life Sciences, Zhejiang University, Hangzhou, China
| | - Junhui Wang
- Institute of Genetics and Regenerative Biology, College of Life Sciences, Zhejiang University, Hangzhou, China
- For correspondence. E-mail
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Identification and Expression of SAUR Genes in the CAM Plant Agave. Genes (Basel) 2019; 10:genes10070555. [PMID: 31340544 PMCID: PMC6679190 DOI: 10.3390/genes10070555] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2019] [Revised: 07/13/2019] [Accepted: 07/18/2019] [Indexed: 01/04/2023] Open
Abstract
Agave species are important crassulacean acid metabolism (CAM) plants and widely cultivated in tropical areas for producing tequila spirit and fiber. The hybrid H11648 of Agave ((A. amaniensis × A. angustifolia) × A. amaniensis) is the main cultivar for fiber production in Brazil, China, and African countries. Small Auxin Up-regulated RNA (SAUR) genes have broad effect on auxin signaling-regulated plant growth and development, while only few SAUR genes have been reported in Agave species. In this study, we identified 43, 60, 24, and 21 SAUR genes with full-length coding regions in A. deserti, A. tequilana, A. H11648, and A. americana, respectively. Although phylogenetic analysis revealed that rice contained a species-specific expansion pattern of SAUR gene, no similar phenomena were observed in Agave species. The in silico expression indicated that SAUR genes had a distinct expression pattern in A. H11648 compared with other Agave species; and four SAUR genes were differentially expressed during CAM diel cycle in A. americana. Additionally, an expression analysis was conducted to estimate SAUR gene expression during different leaf developmental stages, abiotic and biotic stresses in A. H11648. Together, we first characterized the SAUR genes of Agave based on previously published transcriptome datasets and emphasized the potential functions of SAUR genes in Agave's leaf development and stress responses. The identification of which further expands our understanding on auxin signaling-regulated plant growth and development in Agave species.
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Shin JH, Mila I, Liu M, Rodrigues MA, Vernoux T, Pirrello J, Bouzayen M. The RIN-regulated Small Auxin-Up RNA SAUR69 is involved in the unripe-to-ripe phase transition of tomato fruit via enhancement of the sensitivity to ethylene. THE NEW PHYTOLOGIST 2019; 222:820-836. [PMID: 30511456 DOI: 10.1111/nph.15618] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Accepted: 11/24/2018] [Indexed: 05/22/2023]
Abstract
Ethylene is the main hormone controlling climacteric fruit ripening; however, the mechanisms underlying the developmental transition leading to the initiation of the ripening process remain elusive, although the presumed role of active hormone interplay has often been postulated. To unravel the putative role of auxin in the unripe-to-ripe transition, we investigated the dynamics of auxin activity in tomato fruit and addressed the physiological significance of Sl-SAUR69, previously identified as a RIN target gene, using reverse genetics approaches. Auxin signalling undergoes dramatic decline at the onset of ripening in wild-type fruit, but not in the nonripening rin mutant. Sl-SAUR69 exhibits reduced expression in rin and its up-regulation results in premature initiation of ripening, whereas its down-regulation extends the time to ripening. Overexpression of Sl-SAUR69 reduces proton pump activity and polar auxin transport, and ectopic expression in Arabidopsis alters auxin transporter abundance, further arguing for its active role in the regulation of auxin transport. The data support a model in which Sl-SAUR69 represses auxin transport, thus generating auxin minima, which results in enhanced ethylene sensitivity. This defines a regulation loop, fed by ethylene and auxin as the main hormonal signals and by RIN and Sl-SAUR69 as modulators of the balance between the two hormones.
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Affiliation(s)
- Jun-Hye Shin
- GBF Laboratory, Université de Toulouse, INRA, Castanet-Tolosan, 31320, France
| | - Isabelle Mila
- GBF Laboratory, Université de Toulouse, INRA, Castanet-Tolosan, 31320, France
| | - Mingchun Liu
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, 610065, Sichuan, China
| | - Maria Aurineide Rodrigues
- GBF Laboratory, Université de Toulouse, INRA, Castanet-Tolosan, 31320, France
- Laboratory of Plant Physiology, Institute of Biosciences, Department of Botany, Universidade de São Paulo, São Paulo, 11461, Brazil
| | - Teva Vernoux
- Laboratoire de Reproduction et Développement des Plantes, CNRS, INRA, ENS de Lyon, UCBL, Université de Lyon, Lyon, 69364, France
| | - Julien Pirrello
- GBF Laboratory, Université de Toulouse, INRA, Castanet-Tolosan, 31320, France
| | - Mondher Bouzayen
- GBF Laboratory, Université de Toulouse, INRA, Castanet-Tolosan, 31320, France
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Tappiban P, Smith DR, Triwitayakorn K, Bao J. Recent understanding of starch biosynthesis in cassava for quality improvement: A review. Trends Food Sci Technol 2019. [DOI: 10.1016/j.tifs.2018.11.019] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Stortenbeker N, Bemer M. The SAUR gene family: the plant's toolbox for adaptation of growth and development. JOURNAL OF EXPERIMENTAL BOTANY 2019; 70:17-27. [PMID: 30239806 DOI: 10.1093/jxb/ery332] [Citation(s) in RCA: 146] [Impact Index Per Article: 29.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Accepted: 09/14/2018] [Indexed: 05/20/2023]
Abstract
The family of small auxin up-regulated RNA (SAUR) genes is a family of auxin-responsive genes with ~60-140 members in most higher plant species. Despite the early discovery of their auxin responsiveness, their function and mode of action remained unknown for a long time. In recent years, the importance of SAUR genes in the regulation of dynamic and adaptive growth, and the molecular mechanisms by which SAUR proteins act are increasingly well understood. SAURs play a central role in auxin-induced acid growth, but can also act independently of auxin, tissue specifically regulated by various other hormone pathways and transcription factors. In this review, we summarize recent advances in the characterization of the SAUR genes in Arabidopsis and other plant species. We particularly elaborate on their capacity to fine-tune growth in response to internal and external signals, and discuss the breakthroughs in understanding the mode of action of SAURs in relation to their complex regulation.
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Affiliation(s)
- Niek Stortenbeker
- Department of Molecular Plant Physiology, Institute for Water and Wetland Research, Radboud University Nijmegen, Nijmegen, The Netherlands
| | - Marian Bemer
- Laboratory of Molecular Biology and Business Unit Bioscience, Wageningen University & Research, Wageningen, The Netherlands
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MePHD1 as a PHD-Finger Protein Negatively Regulates ADP-Glucose Pyrophosphorylase Small Subunit1a Gene in Cassava. Int J Mol Sci 2018; 19:ijms19092831. [PMID: 30235813 PMCID: PMC6164933 DOI: 10.3390/ijms19092831] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Revised: 09/11/2018] [Accepted: 09/15/2018] [Indexed: 11/17/2022] Open
Abstract
ADP-glucose pyrophosphorylase (AGPase) is an important enzyme in the starch synthesis pathway. Its enzyme activity can determine the efficiency of starch biosynthesis. Cassava (Manihot esculenta Crantz) is the main staple crop worldwide and has a high starch content in its storage root. However, the inner regulatory mechanism of AGPase gene family is unclear. MePHD1; a plant homeodomain transcription factor; was isolated through a yeast one-hybrid screening using the promoter of ADP-glucose pyrophosphorylase small subunit1a (MeAGPS1a) as bait, and cassava storage root cDNA library as prey. This factor could bind to the MeAGPS1a promoter in vitro and in vivo, and its predicted binding region ranged from −400 bp to −201 bp, at the translation initiation site. The transcript level of MePHD1 could be induced by five plant hormones, and a temperature of 42 °C. This was down-regulated during the maturation process of the storage root. MePHD1 protein could repress the promoter activity of MeAGPS1a gene by a dual-luciferase assay; which indicated that MePHD1 is a negative regulator for the transcript level of MeAGPS1a gene.
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Ethylene Responsive Factor MeERF72 Negatively Regulates Sucrose synthase 1 Gene in Cassava. Int J Mol Sci 2018; 19:ijms19051281. [PMID: 29693589 PMCID: PMC5983797 DOI: 10.3390/ijms19051281] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2018] [Revised: 03/25/2018] [Accepted: 03/29/2018] [Indexed: 01/29/2023] Open
Abstract
Cassava, an important food and industrial crop globally, is characterized by its powerful starch accumulation in its storage root. However, the underlying molecular mechanism for this feature remains unclear. Sucrose synthase initializes the conversion of sucrose to starch, and, to a certain extent, its enzyme activity can represent sink strength. To understand the modulation of MeSus gene family, the relatively high expressed member in storage root, MeSus1, its promoter was used as bait to screen cassava storage root full-length cDNA library through a yeast one-hybrid system. An ethylene responsive factor cDNA, designated as MeERF72 according to its homolog in Arabidopsis, was screened out. The transcript level of MeERF72 was induced by ethylene, drought, and salt treatments and repressed by abscisic acid, Auxin, gibberellin, salicylic acid, and low and high temperatures. The MeERF72 protein has a conserved APETALA2 domain in its N-terminus and an activated domain of 30 amino acids in its C-terminus, can bind to MeSus1 promoter in vitro and in vivo, and represses the promoter activity of MeSus1. MeERF72 is a transcription factor that can negatively regulate the expression level of MeSus1 in cassava.
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