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Luo B, Zhang G, Yu T, Zhang C, Yang G, Luo X, Zhang S, Guo J, Zhang H, Zheng H, Tang Z, Li Q, Lan Y, Ma P, Nie Z, Zhang X, Liu D, Wu L, Gao D, Gao S, Su S, Guo J, Gao S. Genome-wide association studies dissect low-phosphorus stress response genes underling field and seedling traits in maize. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2024; 137:172. [PMID: 38935162 DOI: 10.1007/s00122-024-04681-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2024] [Accepted: 06/19/2024] [Indexed: 06/28/2024]
Abstract
Phosphorus (P) is an essential element for plant growth, and its deficiency can cause decreased crop yield. This study systematically evaluated the low-phosphate (Pi) response traits in a large population at maturity and seedling stages, and explored candidate genes and their interrelationships with specific traits. The results revealed a greater sensitivity of seedling maize to low-Pi stress compared to that at maturity stage. The phenotypic response patterns to low-Pi stress at different stages were independent. Chlorophyll content was found to be a potential indicator for screening low-Pi-tolerant materials in the field. A total of 2900 and 1446 significantly associated genes at the maturity and seedling stages were identified, respectively. Among these genes, 972 were uniquely associated with maturity traits, while 330 were specifically detected at the seedling stage under low-Pi stress. Moreover, 768 and 733 genes were specifically associated with index values (low-Pi trait/normal-Pi trait) at maturity and seedling stage, respectively. Genetic network diagrams showed that the low-Pi response gene Zm00001d022226 was specifically associated with multiple primary P-related traits under low-Pi conditions. A total of 963 out of 2966 genes specifically associated with traits under low-Pi conditions or index values were found to be induced by low-Pi stress. Notably, ZmSPX4.1 and ZmSPX2 were sharply up-regulated in response to low-Pi stress across different lines or tissues. These findings advance our understanding of maize's response to low-Pi stress at different developmental stages, shedding light on the genes and pathways implicated in this response.
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Affiliation(s)
- Bowen Luo
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Chengdu, 611130, Sichuan, China
- Maize Research Institute, Sichuan Agricultural University, Chengdu, 611130, Sichuan, China
- Key Laboratory of Biology and Genetic Improvement of Maize in Southwest Region, Ministry of Agriculture, Chengdu, 611130, Sichuan, China
| | - Guidi Zhang
- Maize Research Institute, Sichuan Agricultural University, Chengdu, 611130, Sichuan, China
- Key Laboratory of Biology and Genetic Improvement of Maize in Southwest Region, Ministry of Agriculture, Chengdu, 611130, Sichuan, China
| | - Ting Yu
- Maize Research Institute, Sichuan Agricultural University, Chengdu, 611130, Sichuan, China
- Key Laboratory of Biology and Genetic Improvement of Maize in Southwest Region, Ministry of Agriculture, Chengdu, 611130, Sichuan, China
| | - Chong Zhang
- Maize Research Institute, Sichuan Agricultural University, Chengdu, 611130, Sichuan, China
- Key Laboratory of Biology and Genetic Improvement of Maize in Southwest Region, Ministry of Agriculture, Chengdu, 611130, Sichuan, China
| | - Guohui Yang
- Maize Research Institute, Sichuan Agricultural University, Chengdu, 611130, Sichuan, China
- Key Laboratory of Biology and Genetic Improvement of Maize in Southwest Region, Ministry of Agriculture, Chengdu, 611130, Sichuan, China
| | - Xianfu Luo
- Maize Research Institute, Sichuan Agricultural University, Chengdu, 611130, Sichuan, China
- Key Laboratory of Biology and Genetic Improvement of Maize in Southwest Region, Ministry of Agriculture, Chengdu, 611130, Sichuan, China
| | - Shuhao Zhang
- Maize Research Institute, Sichuan Agricultural University, Chengdu, 611130, Sichuan, China
- Key Laboratory of Biology and Genetic Improvement of Maize in Southwest Region, Ministry of Agriculture, Chengdu, 611130, Sichuan, China
| | - Jianyong Guo
- Maize Research Institute, Sichuan Agricultural University, Chengdu, 611130, Sichuan, China
- Key Laboratory of Biology and Genetic Improvement of Maize in Southwest Region, Ministry of Agriculture, Chengdu, 611130, Sichuan, China
| | - Haiying Zhang
- Maize Research Institute, Sichuan Agricultural University, Chengdu, 611130, Sichuan, China
- Key Laboratory of Biology and Genetic Improvement of Maize in Southwest Region, Ministry of Agriculture, Chengdu, 611130, Sichuan, China
| | - Hao Zheng
- College of Agronomy, Sichuan Agricultural University, Chengdu, 611130, Sichuan, China
| | - Zirui Tang
- College of Agronomy, Sichuan Agricultural University, Chengdu, 611130, Sichuan, China
| | - Qile Li
- College of Agronomy, Sichuan Agricultural University, Chengdu, 611130, Sichuan, China
| | - Yuzhou Lan
- Department of Plant Breeding, The Swedish University of Agricultural Sciences, P.O. Box 190, 23422, Lomma, Sweden
| | - Peng Ma
- Mianyang Academy of Agricultural Sciences, Mianyang, 621023, Sichuan, China
- Crop Characteristic Resources Creation and Utilization Key Laboratory of Sichuan Province, Mianyang, China
| | - Zhi Nie
- Sichuan Academy of Agricultural Sciences, Biotechnology and Nuclear Technology Research Institute, Chengdu, China
| | - Xiao Zhang
- Maize Research Institute, Sichuan Agricultural University, Chengdu, 611130, Sichuan, China
- Key Laboratory of Biology and Genetic Improvement of Maize in Southwest Region, Ministry of Agriculture, Chengdu, 611130, Sichuan, China
| | - Dan Liu
- Maize Research Institute, Sichuan Agricultural University, Chengdu, 611130, Sichuan, China
- Key Laboratory of Biology and Genetic Improvement of Maize in Southwest Region, Ministry of Agriculture, Chengdu, 611130, Sichuan, China
| | - Ling Wu
- Maize Research Institute, Sichuan Agricultural University, Chengdu, 611130, Sichuan, China
- Key Laboratory of Biology and Genetic Improvement of Maize in Southwest Region, Ministry of Agriculture, Chengdu, 611130, Sichuan, China
| | - Duojiang Gao
- Maize Research Institute, Sichuan Agricultural University, Chengdu, 611130, Sichuan, China
- Key Laboratory of Biology and Genetic Improvement of Maize in Southwest Region, Ministry of Agriculture, Chengdu, 611130, Sichuan, China
| | - Shiqiang Gao
- Maize Research Institute, Sichuan Agricultural University, Chengdu, 611130, Sichuan, China
- Key Laboratory of Biology and Genetic Improvement of Maize in Southwest Region, Ministry of Agriculture, Chengdu, 611130, Sichuan, China
| | - Shunzong Su
- College of Resources, Sichuan Agricultural University, Chengdu, 611130, Sichuan, China
| | - Jia Guo
- Rice Research Institute, Sichuan Agricultural University, Chengdu, 611130, Sichuan, China
| | - Shibin Gao
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Chengdu, 611130, Sichuan, China.
- Maize Research Institute, Sichuan Agricultural University, Chengdu, 611130, Sichuan, China.
- Key Laboratory of Biology and Genetic Improvement of Maize in Southwest Region, Ministry of Agriculture, Chengdu, 611130, Sichuan, China.
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2
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Bai Y, Yang Q, Gan Y, Li M, Zhao Z, Dong E, Li C, He D, Mei X, Cai Y. The ZmNF-YC1-ZmAPRG pathway modulates low phosphorus tolerance in maize. JOURNAL OF EXPERIMENTAL BOTANY 2024; 75:2867-2881. [PMID: 38393826 DOI: 10.1093/jxb/erae068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Accepted: 02/21/2024] [Indexed: 02/25/2024]
Abstract
Phosphorus (P) is an essential nutrient for plant growth and yield. Low phosphate use efficiency makes it important to clarify the molecular mechanism of low P stress. In our previous studies, a P efficiency gene ZmAPRG was identified. Here, we further screened the upstream regulator ZmNF-YC1 of ZmAPRG by yeast one hybrid (Y1H) assay, and found it was a low inorganic phosphorus (Pi)-inducible gene. The results of dual luciferase assays, expression analysis, and ChIP-qPCR assays showed that ZmNF-YC1 is a positive regulator of ZmAPRG. Overexpression of ZmNF-YC1 improved low P tolerance, whereas knockout of ZmNF-YC1 decreased low P tolerance in maize. Bimolecular fluorescence complementation (BiFC), yeast two hybrid (Y2H) assay, and yeast three hybrid (Y3H) assay further showed that ZmNF-YC1 can interact with ZmNF-YB14, and recruit ZmNF-YA4/10 to form NF-Y complexes. Transcriptional activation assay confirmed that the NF-Y complexes can activate the promoters of ZmAPRG. Meanwhile, transcriptome and metabolome analyses indicated that overexpression of ZmAPRG improves low P tolerance by regulating lipid composition and photosynthetic capacity, and chlorophyll fluorescence parameters provided evidence in support of this hypothesis. Furthermore, overexpression of ZmAPRG increased grain yield in inbred and hybrid maize under low P conditions. Taken together, our research revealed a low P tolerance mechanism of the ZmNF-YC1-ZmAPRG pathway.
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Affiliation(s)
- Yang Bai
- Maize Research Institute, Southwest University, Chongqing 400715, China
- Engineering Research Center of South Upland Agriculture, Ministry of Education, Southwest University, Chongqing 400715, China
| | - Qiuyue Yang
- Maize Research Institute, Southwest University, Chongqing 400715, China
- Engineering Research Center of South Upland Agriculture, Ministry of Education, Southwest University, Chongqing 400715, China
| | - Yuling Gan
- Maize Research Institute, Southwest University, Chongqing 400715, China
- Engineering Research Center of South Upland Agriculture, Ministry of Education, Southwest University, Chongqing 400715, China
| | - Mei Li
- Department of Agriculture and Horticulture, Guangxi Agricultural Vocational University, Nanning 530007, Guangxi, China
| | - Zikun Zhao
- Maize Research Institute, Southwest University, Chongqing 400715, China
- Engineering Research Center of South Upland Agriculture, Ministry of Education, Southwest University, Chongqing 400715, China
| | - Erfei Dong
- Maize Research Institute, Southwest University, Chongqing 400715, China
- Engineering Research Center of South Upland Agriculture, Ministry of Education, Southwest University, Chongqing 400715, China
| | - Chaofeng Li
- Maize Research Institute, Southwest University, Chongqing 400715, China
- Engineering Research Center of South Upland Agriculture, Ministry of Education, Southwest University, Chongqing 400715, China
| | - Di He
- Maize Research Institute, Southwest University, Chongqing 400715, China
- Engineering Research Center of South Upland Agriculture, Ministry of Education, Southwest University, Chongqing 400715, China
| | - Xiupeng Mei
- Maize Research Institute, Southwest University, Chongqing 400715, China
- Engineering Research Center of South Upland Agriculture, Ministry of Education, Southwest University, Chongqing 400715, China
| | - Yilin Cai
- Maize Research Institute, Southwest University, Chongqing 400715, China
- Engineering Research Center of South Upland Agriculture, Ministry of Education, Southwest University, Chongqing 400715, China
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3
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Morote L, Rubio-Moraga Á, López Jiménez AJ, Aragonés V, Diretto G, Demurtas OC, Frusciante S, Ahrazem O, Daròs JA, Gómez-Gómez L. Verbascum species as a new source of saffron apocarotenoids and molecular tools for the biotechnological production of crocins and picrocrocin. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2024; 118:58-72. [PMID: 38100533 DOI: 10.1111/tpj.16589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Revised: 11/27/2023] [Accepted: 12/04/2023] [Indexed: 12/17/2023]
Abstract
Crocins are glucosylated apocarotenoids present in flowers and fruits of a few plant species, including saffron, gardenia, and Buddleja. The biosynthesis of crocins in these plants has been unraveled, and the enzymes engineered for the production of crocins in heterologous systems. Mullein (Verbascum sp.) has been identified as a new source of crocins and picrocrocin. In this work, we have identified eight enzymes involved in the cleavage of carotenoids in two Verbascum species, V. giganteum and V. sinuatum. Four of them were homologous to the previously identified BdCCD4.1 and BdCCD4.3 from Buddleja, involved in the biosynthesis of crocins. These enzymes were analyzed for apocarotenogenic activity in bacteria and Nicotiana benthamiana plants using a virus-driven system. Metabolic analyses of bacterial extracts and N. benthamiana leaves showed the efficient activity of these enzymes to produce crocins using β-carotene and zeaxanthin as substrates. Accumulations of 0.17% of crocins in N. benthamiana dry leaves were reached in only 2 weeks using a recombinant virus expressing VgCCD4.1, similar to the amounts previously produced using the canonical saffron CsCCD2L. The identification of these enzymes, which display a particularly broad substrate spectrum, opens new avenues for apocarotenoid biotechnological production.
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Affiliation(s)
- Lucía Morote
- Instituto Botánico, Departamento de Ciencia y Tecnología Agroforestal y Genética, Universidad de Castilla-La Mancha, Campus Universitario s/n, 02071, Albacete, Spain
| | - Ángela Rubio-Moraga
- Instituto Botánico, Departamento de Ciencia y Tecnología Agroforestal y Genética, Universidad de Castilla-La Mancha, Campus Universitario s/n, 02071, Albacete, Spain
- Escuela Técnica Superior de Ingeniería Agronómica y de Montes y Biotecnología. Departamento de Ciencia y Tecnología Agroforestal y Genética, Universidad de Castilla-La Mancha, Campus Universitario s/n, 02071, Albacete, Spain
| | - Alberto José López Jiménez
- Instituto Botánico, Departamento de Ciencia y Tecnología Agroforestal y Genética, Universidad de Castilla-La Mancha, Campus Universitario s/n, 02071, Albacete, Spain
- Escuela Técnica Superior de Ingeniería Agronómica y de Montes y Biotecnología. Departamento de Ciencia y Tecnología Agroforestal y Genética, Universidad de Castilla-La Mancha, Campus Universitario s/n, 02071, Albacete, Spain
| | - Verónica Aragonés
- Instituto de Biología Molecular y Celular de Plantas (Consejo Superior de Investigaciones Científicas-Universitat Politècnica de València), 46022, Valencia, Spain
| | - Gianfranco Diretto
- Italian National Agency for New Technologies, Energy, and Sustainable Development, Casaccia Research Centre, 00123, Rome, Italy
| | - Olivia Costantina Demurtas
- Italian National Agency for New Technologies, Energy, and Sustainable Development, Casaccia Research Centre, 00123, Rome, Italy
| | - Sarah Frusciante
- Italian National Agency for New Technologies, Energy, and Sustainable Development, Casaccia Research Centre, 00123, Rome, Italy
| | - Oussama Ahrazem
- Instituto Botánico, Departamento de Ciencia y Tecnología Agroforestal y Genética, Universidad de Castilla-La Mancha, Campus Universitario s/n, 02071, Albacete, Spain
- Escuela Técnica Superior de Ingeniería Agronómica y de Montes y Biotecnología. Departamento de Ciencia y Tecnología Agroforestal y Genética, Universidad de Castilla-La Mancha, Campus Universitario s/n, 02071, Albacete, Spain
| | - José-Antonio Daròs
- Instituto de Biología Molecular y Celular de Plantas (Consejo Superior de Investigaciones Científicas-Universitat Politècnica de València), 46022, Valencia, Spain
| | - Lourdes Gómez-Gómez
- Instituto Botánico, Departamento de Ciencia y Tecnología Agroforestal y Genética, Universidad de Castilla-La Mancha, Campus Universitario s/n, 02071, Albacete, Spain
- Facultad de Farmacia, Universidad de Castilla-La Mancha, Campus Universitario s/n, 02071, Albacete, Spain
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4
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Votta C, Wang JY, Cavallini N, Savorani F, Capparotto A, Liew KX, Giovannetti M, Lanfranco L, Al-Babili S, Fiorilli V. Integration of rice apocarotenoid profile and expression pattern of Carotenoid Cleavage Dioxygenases reveals a positive effect of β-ionone on mycorrhization. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2024; 207:108366. [PMID: 38244387 DOI: 10.1016/j.plaphy.2024.108366] [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: 08/03/2023] [Revised: 01/09/2024] [Accepted: 01/10/2024] [Indexed: 01/22/2024]
Abstract
Carotenoids are susceptible to degrading processes initiated by oxidative cleavage reactions mediated by Carotenoid Cleavage Dioxygenases that break their backbone, leading to products called apocarotenoids. These carotenoid-derived metabolites include the phytohormones abscisic acid and strigolactones, and different signaling molecules and growth regulators, which are utilized by plants to coordinate many aspects of their life. Several apocarotenoids have been recruited for the communication between plants and arbuscular mycorrhizal (AM) fungi and as regulators of the establishment of AM symbiosis. However, our knowledge on their biosynthetic pathways and the regulation of their pattern during AM symbiosis is still limited. In this study, we generated a qualitative and quantitative profile of apocarotenoids in roots and shoots of rice plants exposed to high/low phosphate concentrations, and upon AM symbiosis in a time course experiment covering different stages of growth and AM development. To get deeper insights in the biology of apocarotenoids during this plant-fungal symbiosis, we complemented the metabolic profiles by determining the expression pattern of CCD genes, taking advantage of chemometric tools. This analysis revealed the specific profiles of CCD genes and apocarotenoids across different stages of AM symbiosis and phosphate supply conditions, identifying novel reliable markers at both local and systemic levels and indicating a promoting role of β-ionone in AM symbiosis establishment.
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Affiliation(s)
- Cristina Votta
- Department of Life Sciences and Systems Biology, University of Torino, Viale Mattioli 25, Torino, 10125, Italy
| | - Jian You Wang
- The BioActives Lab, Center for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
| | - Nicola Cavallini
- Department of Applied Science and Technology (DISAT), Polytechnic of Turin, Corso Duca Degli Abruzzi 24, 10129, Torino, Italy
| | - Francesco Savorani
- Department of Applied Science and Technology (DISAT), Polytechnic of Turin, Corso Duca Degli Abruzzi 24, 10129, Torino, Italy
| | - Arianna Capparotto
- Department of Biology, University of Padova, Via Ugo Bassi 58/b, 35131, Padova, Italy
| | - Kit Xi Liew
- The BioActives Lab, Center for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
| | - Marco Giovannetti
- Department of Life Sciences and Systems Biology, University of Torino, Viale Mattioli 25, Torino, 10125, Italy; Department of Biology, University of Padova, Via Ugo Bassi 58/b, 35131, Padova, Italy
| | - Luisa Lanfranco
- Department of Life Sciences and Systems Biology, University of Torino, Viale Mattioli 25, Torino, 10125, Italy
| | - Salim Al-Babili
- The BioActives Lab, Center for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia; The Plant Science Program, Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia.
| | - Valentina Fiorilli
- Department of Life Sciences and Systems Biology, University of Torino, Viale Mattioli 25, Torino, 10125, Italy.
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Qi Z, Tong X, Zhang Y, Jia S, Fang X, Zhao L. Carotenoid Cleavage Dioxygenase 1 and Its Application for the Production of C13-Apocarotenoids in Microbial Cell Factories: A Review. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023; 71:19240-19254. [PMID: 38047615 DOI: 10.1021/acs.jafc.3c06459] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/05/2023]
Abstract
C13-apocarotenoids are naturally derived from the C9-C10 (C9'-C10') double-bond cleavage of carotenoids by carotenoid cleavage dioxygenases (CCDs). As high-value flavors and fragrances in the food and cosmetic industries, the sustainable production of C13-apocarotenoids is emerging in microbial cell factories by the carotenoid cleavage dioxygenase 1 (CCD1) subfamily. However, the commercialization of microbial-based C13-apocarotenoids is still limited by the poor performance of CCD1, which severely constrains its conversion efficiency from precursor carotenoids. This review focuses on the classification of CCDs and their cleavage modes for carotenoids to generate corresponding apocarotenoids. We then emphatically discuss the advances for C13-apocarotenoid biosynthesis in microbial cell factories with various strategies, including optimization of CCD1 expression, improvement of CCD1's catalytic activity and substrate specificity, strengthening of substrate channeling, and development of oleaginous microbial hosts, which have been verified to increase the conversion rate from carotenoids. Lastly, the current challenges and future directions will be discussed to enhance CCDs' application for C13-apocarotenoids biomanufacturing.
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Affiliation(s)
- Zhipeng Qi
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, 159 Long Pan Road, Nanjing 210037, China
- College of Chemical Engineering, Nanjing Forestry University, 159 Long Pan Road, Nanjing 210037, China
| | - Xinyi Tong
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, 159 Long Pan Road, Nanjing 210037, China
- College of Chemical Engineering, Nanjing Forestry University, 159 Long Pan Road, Nanjing 210037, China
| | - Yangyang Zhang
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, 159 Long Pan Road, Nanjing 210037, China
- College of Chemical Engineering, Nanjing Forestry University, 159 Long Pan Road, Nanjing 210037, China
| | - Shutong Jia
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, 159 Long Pan Road, Nanjing 210037, China
- College of Chemical Engineering, Nanjing Forestry University, 159 Long Pan Road, Nanjing 210037, China
| | - Xianying Fang
- College of Chemical Engineering, Nanjing Forestry University, 159 Long Pan Road, Nanjing 210037, China
- Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China
| | - Linguo Zhao
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, 159 Long Pan Road, Nanjing 210037, China
- College of Chemical Engineering, Nanjing Forestry University, 159 Long Pan Road, Nanjing 210037, China
- Jiangsu Province Key Lab for the Chemistry & Utilization of Agricultural and Forest, Nanjing 210037, China
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Zhao J, Xu Y, Li H, Zhu X, Yin Y, Zhang X, Qin X, Zhou J, Duan L, Liang X, Huang T, Zhang B, Wan R, Shi Z, Cao Y, An W. ERF5.1 modulates carotenoid accumulation by interacting with CCD4.1 in Lycium. HORTICULTURE RESEARCH 2023; 10:uhad230. [PMID: 38143484 PMCID: PMC10745278 DOI: 10.1093/hr/uhad230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Accepted: 11/01/2023] [Indexed: 12/26/2023]
Abstract
Carotenoids are important natural pigments and have medical and health functions for humans. Carotenoid cleavage dioxygenase 4 (CCD4) and ethylene responsive factor (ERF) participate in carotenoid metabolism, but their roles in Lycium have not been discovered. Here, we annotated LbCCDs from the Lycium reference genome and found that LbCCD4.1 expression was significantly correlated with the carotenoid metabolites during Lycium five fruit developmental stages. Over-expression of LbCCD4.1 in NQ's leaves resulted in a series of significantly lower contents of carotenoid metabolites, including β-carotene and β-cryptoxanthin. Moreover, LbERF5.1, a transcription factor belonging to the ERF family that was located in the nucleus, was isolated. Significant reductions in the carotenoids, especially lutein, violaxanthin and their derivatives, were observed in over-expressing ERF5.1 transgenic NQ's leaves. Over-expression or virus-induced gene silencing of LbERF5.1 in NQ's leaves induced a consistent up- or down-expression, respectively, of LbCCD4.1. Furthermore, yeast one-hybrid and dual-luciferase reporter assays showed that ERF5.1 interacted with the promoter of CCD4.1 to increase its expression, and LbERF5.1 could bind to any one of the three predicted binding sites in the promoter of LbCCD4.1. A transcriptome analysis of LbERF5.1 and LbCCD4.1 over-expressed lines showed similar global transcript expression, and geranylgeranyl diphosphate synthase, phytoene synthase, lycopene δ-cyclase cytochrome, cytochrome P450-type monooxygenase 97A, cytochrome P450-type monooxygenase 97C, and zeaxanthin epoxidase in the carotenoid biosynthesis pathway were differentially expressed. In summary, we uncovered a novel molecular mechanism of carotenoid accumulation that involved an interaction between ERF5.1 and CCD4.1, which may be used to enhance carotenoid in Lycium.
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Affiliation(s)
- Jianhua Zhao
- National Wolfberry Engineering Research Center/Wolfberry Science Research Institute, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, 750002, China
| | - Yuhui Xu
- National Wolfberry Engineering Research Center/Wolfberry Science Research Institute, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, 750002, China
| | - Haoxia Li
- Institute of Forestry and Grassland Ecology, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, 750002, China
| | - Xinlei Zhu
- National Wolfberry Engineering Research Center/Wolfberry Science Research Institute, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, 750002, China
| | - Yue Yin
- National Wolfberry Engineering Research Center/Wolfberry Science Research Institute, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, 750002, China
| | - Xiyan Zhang
- National Wolfberry Engineering Research Center/Wolfberry Science Research Institute, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, 750002, China
| | | | - Jun Zhou
- College of Biological Science & Engineering, North Minzu University, Yinchuan 750021, China
| | - Linyuan Duan
- National Wolfberry Engineering Research Center/Wolfberry Science Research Institute, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, 750002, China
| | - Xiaojie Liang
- National Wolfberry Engineering Research Center/Wolfberry Science Research Institute, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, 750002, China
| | - Ting Huang
- National Wolfberry Engineering Research Center/Wolfberry Science Research Institute, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, 750002, China
| | - Bo Zhang
- National Wolfberry Engineering Research Center/Wolfberry Science Research Institute, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, 750002, China
| | - Ru Wan
- National Wolfberry Engineering Research Center/Wolfberry Science Research Institute, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, 750002, China
| | - Zhigang Shi
- National Wolfberry Engineering Research Center/Wolfberry Science Research Institute, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, 750002, China
| | - Youlong Cao
- National Wolfberry Engineering Research Center/Wolfberry Science Research Institute, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, 750002, China
| | - Wei An
- National Wolfberry Engineering Research Center/Wolfberry Science Research Institute, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, 750002, China
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7
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Basso MF, Contaldi F, Celso FL, Karalija E, Paz-Carrasco LC, Barone G, Ferrante A, Martinelli F. Expression profile of the NCED/CCD genes in chickpea and lentil during abiotic stress reveals a positive correlation with increased plant tolerance. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2023; 336:111817. [PMID: 37562731 DOI: 10.1016/j.plantsci.2023.111817] [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: 03/23/2023] [Revised: 07/28/2023] [Accepted: 08/03/2023] [Indexed: 08/12/2023]
Abstract
Carotenoid cleavage dioxygenase (CCD) gene family is organized in two subfamilies: (i) 9-cis epoxycarotenoid dioxygenase (NCED) genes and (ii) CCD genes. NCED genes are essential for catalyzing the first step of the abscisic-acid (ABA) biosynthesis, while CCD genes produce precursors of the strigolactones hormone. The functional characterization of these gene subfamilies has not been yet performed in chickpea and lentil. Herein, were identified and systematically characterized two NCED and five CCD genes in the chickpea and two NCED and six CCD genes in lentil. After in silico sequence analysis and phylogeny, the expression profile of the NCED/CCD genes was determined by meta-analysis and real-time PCR in plants under different stress conditions. Sequence data revealed that NCED/CCD genes are highly conserved between chickpea and lentil. This conservation was observed both at gene and protein sequence levels and phylogenetic relationships. Analysis of the promoter sequences revealed that all NCED/CCD genes have a considerable number of cis-regulatory elements responsive to biotic and abiotic stress. Protein sequence analysis evidenced that NCED/CCD genes share several conserved motifs and that they have a highly interconnected interaction network. Furthermore, the three-dimensional structure of these proteins was determined and indicated that some proteins have structures with considerable similarity. The meta-analysis revealed that NCED/CCD genes are dynamically modulated in different organs and under different stress conditions, but they have a positive correlation with plant tolerance. In accordance, real-time PCR data showed that both NCED and CCD genes are differentially modulated in plants under drought stress. In particular, CaNCED2, CaCCD5, LcNCED2, LcCCD1, and LcCCD2 genes have a positive correlation with improved plant tolerance to drought stress. Therefore, this study presented a detailed characterization of the chickpea and lentil NCED/CCD genes and provided new insights to improve abiotic stress tolerance in these two important crops.
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Affiliation(s)
- Marcos Fernando Basso
- Department of Biology, University of Florence, Sesto Fiorentino 50019, Florence, Italy; University of Western Santa Catarina, Biotechnological Center, UNOESC, Videira, SC 89566-252, Brazil
| | - Felice Contaldi
- Department of Biology, University of Florence, Sesto Fiorentino 50019, Florence, Italy
| | - Fabrizio Lo Celso
- Department of Physics and Chemical, University of Palermo, Viale delle Scienze, Edificio 17, 90128 Palermo, Italy
| | - Erna Karalija
- Department of Biology, University of Florence, Sesto Fiorentino 50019, Florence, Italy; Department of Biology, Faculty of science, University of Sarajevo, Zmaja od Bosne 33-35, 71000 Sarajevo, Bosnia and Herzegovina
| | - Lenin Celiano Paz-Carrasco
- National Institute of Agricultural Research (INIAP), Plant Pathology Department and Rice Breeding Program, Km 26 vía Duran-Tambo, Yaguachi, Guayas, Ecuador
| | - Giampaolo Barone
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies, University of Palermo, Viale delle Scienze, Edificio 17, 90128 Palermo, Italy
| | - Antonio Ferrante
- Department of Agricultural and Environmental Sciences, Università degli Studi di Milano, Via Celoria 2, 20133 Milan, Italy
| | - Federico Martinelli
- Department of Biology, University of Florence, Sesto Fiorentino 50019, Florence, Italy.
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8
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Yoo HJ, Chung MY, Lee HA, Lee SB, Grandillo S, Giovannoni JJ, Lee JM. Natural overexpression of CAROTENOID CLEAVAGE DIOXYGENASE 4 in tomato alters carotenoid flux. PLANT PHYSIOLOGY 2023; 192:1289-1306. [PMID: 36715630 PMCID: PMC10231392 DOI: 10.1093/plphys/kiad049] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Revised: 12/20/2022] [Accepted: 12/26/2022] [Indexed: 06/01/2023]
Abstract
Carotenoids and apocarotenoids function as pigments and flavor volatiles in plants that enhance consumer appeal and offer health benefits. Tomato (Solanum lycopersicum.) fruit, especially those of wild species, exhibit a high degree of natural variation in carotenoid and apocarotenoid contents. Using positional cloning and an introgression line (IL) of Solanum habrochaites "LA1777', IL8A, we identified carotenoid cleavage dioxygenase 4 (CCD4) as the factor responsible for controlling the dark orange fruit color. CCD4b expression in ripe fruit of IL8A plants was ∼8,000 times greater than that in the wild type, presumably due to 5' cis-regulatory changes. The ShCCD4b-GFP fusion protein localized in the plastid. Phytoene, ζ-carotene, and neurosporene levels increased in ShCCD4b-overexpressing ripe fruit, whereas trans-lycopene, β-carotene, and lutein levels were reduced, suggestive of feedback regulation in the carotenoid pathway by an unknown apocarotenoid. Solid-phase microextraction-gas chromatography-mass spectrometry analysis showed increased levels of geranylacetone and β-ionone in ShCCD4b-overexpressing ripe fruit coupled with a β-cyclocitral deficiency. In carotenoid-accumulating Escherichia coli strains, ShCCD4b cleaved both ζ-carotene and β-carotene at the C9-C10 (C9'-C10') positions to produce geranylacetone and β-ionone, respectively. Exogenous β-cyclocitral decreased carotenoid synthesis in the ripening fruit of tomato and pepper (Capsicum annuum), suggesting feedback inhibition in the pathway. Our findings will be helpful for enhancing the aesthetic and nutritional value of tomato and for understanding the complex regulatory mechanisms of carotenoid and apocarotenoid biogenesis.
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Affiliation(s)
- Hee Ju Yoo
- Department of Horticultural Science, Kyungpook National University, Daegu 41566, Korea
| | - Mi-Young Chung
- Department of Agricultural Education, Sunchon National University, Suncheon 57922, Korea
| | - Hyun-Ah Lee
- Division of Eco-Friendly Horticulture, Yonam College, Cheonan 31005, Korea
| | - Soo-Bin Lee
- Department of Horticultural Science, Kyungpook National University, Daegu 41566, Korea
| | - Silvana Grandillo
- CNR-Institute of Bioscience and Bioresources (IBBR), Via Università 133, 80055 Portici, Italy
| | - James J Giovannoni
- Boyce Thompson Institute and USDA-ARS Robert W. Holley Center, Tower Rd., Cornell University Campus, Ithaca, NY 14853, USA
| | - Je Min Lee
- Department of Horticultural Science, Kyungpook National University, Daegu 41566, Korea
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9
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Characterization and evolutionary analysis of phosphate starvation response genes in wheat and other major gramineous plants. Int J Biol Macromol 2023; 225:63-78. [PMID: 36481332 DOI: 10.1016/j.ijbiomac.2022.11.298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 11/17/2022] [Accepted: 11/24/2022] [Indexed: 12/12/2022]
Abstract
Developing cultivars with improved Pi use efficiency is essential for the sustainability of agriculture as well as the environment. Phosphate starvation response (PHR) regulators have not yet been systematically studied in wheat. This study provides the detailed characteristics of PHRs in hexaploid wheat as well as other major gramineous plants at the genome-wide level. The identified PHR proteins were divided into six subfamilies through phylogeny analysis, and a total of 63 paralogous TaPHR pairs were designated as arising from duplication events, with strong purifying selection. The promoters of TaPHRs were identified as stations for many transcription factors. Protein-protein interaction network and gene ontology enrichment analysis indicated a core biological process of cellular response to phosphate starvation. The three-dimensional structures of core PHR proteins showed a high phylogenetic relationship, but amino acid deletions in core protein domains may cause functional differentiation between rice and wheat. TaPHR3 could interact with TaSPX1 and TaSPX5 proteins, which is regarded as a novel interaction mode. Under different Pi gradient treatments, TaPHRs showed low inducible expression patterns among all subfamilies. Our study is the first to comprehensively clarify the basic properties of TaPHR proteins and might accumulate basic data for improving grain yield and environmental homeostasis.
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10
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Giovannini L, Sbrana C, Giovannetti M, Avio L, Lanubile A, Marocco A, Turrini A. Diverse mycorrhizal maize inbred lines differentially modulate mycelial traits and the expression of plant and fungal phosphate transporters. Sci Rep 2022; 12:21279. [PMID: 36482115 PMCID: PMC9732053 DOI: 10.1038/s41598-022-25834-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Accepted: 12/06/2022] [Indexed: 12/13/2022] Open
Abstract
Food production is heavily dependent on soil phosphorus (P), a non-renewable mineral resource essential for plant growth and development. Alas, about 80% is unavailable for plant uptake. Arbuscular mycorrhizal fungi may promote soil P efficient use, although the mechanistic aspects are yet to be completely understood. In this study, plant and fungal variables involved in P acquisition were investigated in maize inbred lines, differing for mycorrhizal responsiveness and low-P tolerance, when inoculated with the symbiont Rhizoglomus irregulare (synonym Rhizophagus irregularis). The expression patterns of phosphate transporter (PT) genes in extraradical and intraradical mycelium (ERM/IRM) and in mycorrhizal and control maize roots were assessed, together with plant growth responses and ERM extent and structure. The diverse maize lines differed in plant and fungal accumulation patterns of PT transcripts, ERM phenotypic traits and plant performance. Mycorrhizal plants of the low-P tolerant maize line Mo17 displayed increased expression of roots and ERM PT genes, compared with the low-P susceptible line B73, which revealed larger ERM hyphal densities and interconnectedness. ERM structural traits showed significant correlations with plant/fungal expression levels of PT genes and mycorrhizal host benefit, suggesting that both structural and functional traits are differentially involved in the regulation of P foraging capacity in mycorrhizal networks.
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Affiliation(s)
- Luca Giovannini
- grid.5395.a0000 0004 1757 3729Department of Agriculture, Food and Environment, University of Pisa, Via del Borghetto 80, 56124 Pisa, Italy
| | - Cristiana Sbrana
- grid.5326.20000 0001 1940 4177Institute of Agricultural Biology and Biotechnology, National Research Council of Italy, Via Moruzzi 1, 56124 Pisa, Italy
| | - Manuela Giovannetti
- grid.5395.a0000 0004 1757 3729Department of Agriculture, Food and Environment, University of Pisa, Via del Borghetto 80, 56124 Pisa, Italy
| | - Luciano Avio
- grid.5395.a0000 0004 1757 3729Department of Agriculture, Food and Environment, University of Pisa, Via del Borghetto 80, 56124 Pisa, Italy
| | - Alessandra Lanubile
- grid.8142.f0000 0001 0941 3192Department of Sustainable Crop Production, Università Cattolica del Sacro Cuore, Via Emilia Parmense 84, 29122 Piacenza, Italy
| | - Adriano Marocco
- grid.8142.f0000 0001 0941 3192Department of Sustainable Crop Production, Università Cattolica del Sacro Cuore, Via Emilia Parmense 84, 29122 Piacenza, Italy
| | - Alessandra Turrini
- grid.5395.a0000 0004 1757 3729Department of Agriculture, Food and Environment, University of Pisa, Via del Borghetto 80, 56124 Pisa, Italy
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11
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Sierra J, McQuinn RP, Leon P. The role of carotenoids as a source of retrograde signals: impact on plant development and stress responses. JOURNAL OF EXPERIMENTAL BOTANY 2022; 73:7139-7154. [PMID: 35776102 DOI: 10.1093/jxb/erac292] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Accepted: 06/28/2022] [Indexed: 06/15/2023]
Abstract
Communication from plastids to the nucleus via retrograde signal cascades is essential to modulate nuclear gene expression, impacting plant development and environmental responses. Recently, a new class of plastid retrograde signals has emerged, consisting of acyclic and cyclic carotenoids and/or their degradation products, apocarotenoids. Although the biochemical identity of many of the apocarotenoid signals is still under current investigation, the examples described herein demonstrate the central roles that these carotenoid-derived signals play in ensuring plant development and survival. We present recent advances in the discovery of apocarotenoid signals and their role in various plant developmental transitions and environmental stress responses. Moreover, we highlight the emerging data exposing the highly complex signal transduction pathways underlying plastid to nucleus apocarotenoid retrograde signaling cascades. Altogether, this review summarizes the central role of the carotenoid pathway as a major source of retrograde signals in plants.
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Affiliation(s)
- Julio Sierra
- Departamento de Biología Molecular de Plantas, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad, Ciudada de México, México
| | - Ryan P McQuinn
- School of Science, Western Sydney University, Penrith, NSW, Australia
| | - Patricia Leon
- Departamento de Biología Molecular de Plantas, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad, Ciudada de México, México
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12
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Li F, Gong X, Liang Y, Peng L, Han X, Wen M. Characteristics of a new carotenoid cleavage dioxygenase NtCCD10 derived from Nicotiana tabacum. PLANTA 2022; 256:100. [PMID: 36251100 DOI: 10.1007/s00425-022-04013-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Accepted: 10/09/2022] [Indexed: 06/16/2023]
Abstract
A new carotenoid cleavage dioxygenase NtCCD10 from tobacco was characterized. There is some difference between NtCCD10 and CCD1 in structure. NtCCD10 can cleave the C5-C6 (C5'-C6') and C9-C10 (C9'-C10') double bonds of carotenoids and has high catalytic activity. Carotenoid cleavage dioxygenases (CCDs) cleave carotenoids to produce a variety of apocarotenoids, which have important biological functions for organisms in nature. There are eleven CCDs subfamilies in the plant kingdom, many of which have been extensively characterized in their functions. However, as a newly classified subfamily, the function of CCD10 has rarely been studied. In this work, the function of an NtCCD10 gene from dicotyledonous Nicotiana tabacum was cloned and characterized, and its phylogeny, molecular structural modeling and protein structure were also systematically analyzed. Like other CCDs, NtCCD10 also possesses a seven bladed β-propeller with Fe2+ cofactor in its center constituting the active site of the enzyme. The Fe2+ is also coordinated bonding with four conserved histidine residues. Meanwhile, NtCCD10 also has many unique features, such as its α1 and α3 helixes are not anti-parallel, a special β-sheet and a longer access tunnel for substrates. When expressed in engineered Escherichia coli (producing phytoene, lycopene, β-carotene, and zeaxanthin) and Saccharomyces cerevisiae (producing β-carotene), NtCCD10 could symmetrically cleave phytoene and β-carotene at the C9-C10 and C9'-C10' positions to produce geranylacetone and β-ionone, respectively. In addition, NtCCD10 could also cleave the C5-C6 and C5'-C6' double bonds of lycopene to generate 6-methyl-5-heptene-2-one (MHO). NtCCD10 has higher catalytic activity than PhCCD1 in yeast, which provides a good candidate CCD for biosynthesis of β-ionone and has potential applications in biotechnological industry. This study identified the taxonomic position and catalytic activity of the first NtCCD10 in dicotyledonous plants. This will provide a reference for the discovery and functional identification of CCD10 enzymes in dicotyledons.
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Affiliation(s)
- Fan Li
- National Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Key Laboratory of Microbial Diversity in Southwest China, Ministry of Education, School of Life Sciences, Yunnan Institute of Microbiology, Yunnan University, Kunming, 650091, Yunnan, China
| | - Xiaowei Gong
- National Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Key Laboratory of Microbial Diversity in Southwest China, Ministry of Education, School of Life Sciences, Yunnan Institute of Microbiology, Yunnan University, Kunming, 650091, Yunnan, China
- R & D Center of China Tobacco Yunnan Industrial Co., Ltd, Kunming, 650231, Yunnan, China
| | - Yupeng Liang
- National Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Key Laboratory of Microbial Diversity in Southwest China, Ministry of Education, School of Life Sciences, Yunnan Institute of Microbiology, Yunnan University, Kunming, 650091, Yunnan, China
| | - Lijuan Peng
- Yunnan Tobacco Quality Supervision and Test Station, Kunming, 650106, Yunnan, China
| | - Xiulin Han
- National Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Key Laboratory of Microbial Diversity in Southwest China, Ministry of Education, School of Life Sciences, Yunnan Institute of Microbiology, Yunnan University, Kunming, 650091, Yunnan, China.
| | - Mengliang Wen
- National Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Key Laboratory of Microbial Diversity in Southwest China, Ministry of Education, School of Life Sciences, Yunnan Institute of Microbiology, Yunnan University, Kunming, 650091, Yunnan, China.
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13
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Huang H, Gao X, Gao X, Zhang S, Zheng Y, Zhang N, Hong B, Zhao X, Gu Z. Flower color mutation, pink to orange, through CmGATA4 - CCD4a-5 module regulates carotenoids degradation in chrysanthemum. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2022; 322:111290. [PMID: 35753140 DOI: 10.1016/j.plantsci.2022.111290] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Revised: 04/11/2022] [Accepted: 04/14/2022] [Indexed: 06/15/2023]
Abstract
The carotenoids biosynthesis pathway in plants has been studied extensively, yet little is known about the regulatory mechanisms underlying this process, especially for ornamental horticulture plants. In this study, a natural variation of chrysanthemum with orange coloration was identified and compared with the wild type with pink coloration; the content and component of carotenoids were largely enriched in the mutant with orange coloration. CmCCD4a-5, the DNA sequence in both 'Pink yan' and the mutant, was identified and shown to function as a carotenoid degradation enzyme. Compared with 'Pink yan', the mutant shows lower expression level of CmCCD4a-5. Furthermore, CmGATA4 was found to have an opposite expression trend to CmCCD4a-5, and it could directly bind with the CmCCD4a-5 promoter. Taken together, this study demonstrates that CmGATA4 acts as a negative regulator of CmCCD4a-5 and, furthermore, low expression of CmCCD4a-5 resulted in carotenoid accumulation in the mutant.
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Affiliation(s)
- Hongfeng Huang
- Beijing Key Laboratory of Development and Quality Control of Ornamental Crops, Department of Ornamental Horticulture, China Agricultural University, Beijing 100193, China.
| | - Xuekai Gao
- Beijing Key Laboratory of Development and Quality Control of Ornamental Crops, Department of Ornamental Horticulture, China Agricultural University, Beijing 100193, China.
| | - Xiang Gao
- Key Laboratory of Molecular Epigenetics of MOE and Institute of Genetics & Cytology, Northeast Normal University, Changchun 130024, China.
| | - Shiqi Zhang
- Beijing Key Laboratory of Development and Quality Control of Ornamental Crops, Department of Ornamental Horticulture, China Agricultural University, Beijing 100193, China.
| | - Ying Zheng
- Beijing Key Laboratory of Development and Quality Control of Ornamental Crops, Department of Ornamental Horticulture, China Agricultural University, Beijing 100193, China.
| | - Ning Zhang
- Beijing Key Laboratory of Development and Quality Control of Ornamental Crops, Department of Ornamental Horticulture, China Agricultural University, Beijing 100193, China.
| | - Bo Hong
- Beijing Key Laboratory of Development and Quality Control of Ornamental Crops, Department of Ornamental Horticulture, China Agricultural University, Beijing 100193, China.
| | - Xin Zhao
- Beijing Key Laboratory of Development and Quality Control of Ornamental Crops, Department of Ornamental Horticulture, China Agricultural University, Beijing 100193, China; State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing 100193, China.
| | - Zhaoyu Gu
- Beijing Key Laboratory of Development and Quality Control of Ornamental Crops, Department of Ornamental Horticulture, China Agricultural University, Beijing 100193, China.
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14
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Sun T, Rao S, Zhou X, Li L. Plant carotenoids: recent advances and future perspectives. MOLECULAR HORTICULTURE 2022; 2:3. [PMID: 37789426 PMCID: PMC10515021 DOI: 10.1186/s43897-022-00023-2] [Citation(s) in RCA: 71] [Impact Index Per Article: 35.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2021] [Accepted: 01/03/2022] [Indexed: 10/05/2023]
Abstract
Carotenoids are isoprenoid metabolites synthesized de novo in all photosynthetic organisms. Carotenoids are essential for plants with diverse functions in photosynthesis, photoprotection, pigmentation, phytohormone synthesis, and signaling. They are also critically important for humans as precursors of vitamin A synthesis and as dietary antioxidants. The vital roles of carotenoids to plants and humans have prompted significant progress toward our understanding of carotenoid metabolism and regulation. New regulators and novel roles of carotenoid metabolites are continuously revealed. This review focuses on current status of carotenoid metabolism and highlights recent advances in comprehension of the intrinsic and multi-dimensional regulation of carotenoid accumulation. We also discuss the functional evolution of carotenoids, the agricultural and horticultural application, and some key areas for future research.
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Affiliation(s)
- Tianhu Sun
- Robert W. Holley Center for Agriculture and Health, USDA-Agricultural Research Service, Cornell University, Ithaca, NY, 14853, USA
- Plant Breeding and Genetics Section, School of Integrative Plant Science, Cornell University, Ithaca, NY, 14853, USA
| | - Sombir Rao
- Robert W. Holley Center for Agriculture and Health, USDA-Agricultural Research Service, Cornell University, Ithaca, NY, 14853, USA
- Plant Breeding and Genetics Section, School of Integrative Plant Science, Cornell University, Ithaca, NY, 14853, USA
| | - Xuesong Zhou
- Robert W. Holley Center for Agriculture and Health, USDA-Agricultural Research Service, Cornell University, Ithaca, NY, 14853, USA
- State Key Laboratory of Crop Genetics & Germplasm Enhancement, Nanjing Agricultural University, Nanjing, 210095, China
| | - Li Li
- Robert W. Holley Center for Agriculture and Health, USDA-Agricultural Research Service, Cornell University, Ithaca, NY, 14853, USA.
- Plant Breeding and Genetics Section, School of Integrative Plant Science, Cornell University, Ithaca, NY, 14853, USA.
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15
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Li Y, Gao R, Zhang J, Wang Y, Kong P, Lu K, Adnan , Liu M, Ao F, Zhao C, Wang L, Gao X. The biochemical and molecular investigation of flower color and scent sheds lights on further genetic modification of ornamental traits in Clivia miniata. HORTICULTURE RESEARCH 2022; 9:uhac114. [PMID: 35929604 PMCID: PMC9343915 DOI: 10.1093/hr/uhac114] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Accepted: 05/01/2022] [Indexed: 05/13/2023]
Abstract
Clivia miniata is renowned for its evergreen and strap-like leaves, whereas its floral color and scent are lacking diversity. Here, anthocyanin, volatile terpene, and carotenoid metabolisms were integrally investigated in C. miniata flowers. The results showed that pelargonidins and lutein might cooperate to confer orange or yellow color to C. miniata flowers, but only a trace amount of (+)-limonene was detected. The expression levels of CmF3'H and CmDFR appeared to be responsible for the ratio of cyanidin and pelargonidin derivatives in C. miniata, and the low expression of CmF3'H was responsible for the lack of cyanidins in flowers. Moreover, the CmF3'H promoter could not be activated by CmMYBAs, suggesting that it was controlled by novel regulators. Only two CmTPSs were functional, with CmTPS2 responsible for (+)-limonene synthesis, contributing to the monotonous flower volatile terpenes of C. miniata. CmCCD1a and CmCCD1b were able to cleave carotenoids at the 5,6 (5',6'), and 9,10 (9',10') positions to generate volatile apocarotenoids, whereas the substrates found in low-quantities or specific subcellular localizations of CmCCD1s might constrain volatile apocarotenoid release. Consequently, activating F3'H and introducing novel F3'5'H or versatile TPS may be effective ways to modify the floral color and scent, respectively. Alternatively, modifying the carotenoid flux or CCD1 localization might affect floral color and scent simultaneously. Taking these results together, the present study provides a preliminary deciphering of the genetic constraints underlying flower color and scent development, and proposes possible schemes for further genetic modification of ornamental traits in C. miniata and other plants.
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Affiliation(s)
| | | | - Jia Zhang
- Key Laboratory of Molecular Epigenetics of MOE and Institute of Genetics & Cytology, Northeast Normal University, Changchun 130024, China
| | - Yanan Wang
- Key Laboratory of Molecular Epigenetics of MOE and Institute of Genetics & Cytology, Northeast Normal University, Changchun 130024, China
| | - Peiru Kong
- Key Laboratory of Molecular Epigenetics of MOE and Institute of Genetics & Cytology, Northeast Normal University, Changchun 130024, China
| | - Keyu Lu
- Key Laboratory of Molecular Epigenetics of MOE and Institute of Genetics & Cytology, Northeast Normal University, Changchun 130024, China
| | - Adnan
- Key Laboratory of Molecular Epigenetics of MOE and Institute of Genetics & Cytology, Northeast Normal University, Changchun 130024, China
| | - Meng Liu
- Key Laboratory of Molecular Epigenetics of MOE and Institute of Genetics & Cytology, Northeast Normal University, Changchun 130024, China
| | - Feng Ao
- Key Laboratory of Molecular Epigenetics of MOE and Institute of Genetics & Cytology, Northeast Normal University, Changchun 130024, China
| | | | - Li Wang
- Corresponding authors. E-mail: ; ;
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16
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Zheng X, Yang Y, Al-Babili S. Exploring the Diversity and Regulation of Apocarotenoid Metabolic Pathways in Plants. FRONTIERS IN PLANT SCIENCE 2021; 12:787049. [PMID: 34956282 PMCID: PMC8702529 DOI: 10.3389/fpls.2021.787049] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Accepted: 11/17/2021] [Indexed: 05/31/2023]
Abstract
In plants, carotenoids are subjected to enzyme-catalyzed oxidative cleavage reactions as well as to non-enzymatic degradation processes, which produce various carbonyl products called apocarotenoids. These conversions control carotenoid content in different tissues and give rise to apocarotenoid hormones and signaling molecules, which play important roles in plant growth and development, response to environmental stimuli, and in interactions with surrounding organisms. In addition, carotenoid cleavage gives rise to apocarotenoid pigments and volatiles that contribute to the color and flavor of many flowers and several fruits. Some apocarotenoid pigments, such as crocins and bixin, are widely utilized as colorants and additives in food and cosmetic industry and also have health-promoting properties. Considering the importance of this class of metabolites, investigation of apocarotenoid diversity and regulation has increasingly attracted the attention of plant biologists. Here, we provide an update on the plant apocarotenoid biosynthetic pathway, especially highlighting the diversity of the enzyme carotenoid cleavage dioxygenase 4 (CCD4) from different plant species with respect to substrate specificity and regioselectivity, which contribute to the formation of diverse apocarotenoid volatiles and pigments. In addition, we summarize the regulation of apocarotenoid metabolic pathway at transcriptional, post-translational, and epigenetic levels. Finally, we describe inter- and intraspecies variation in apocarotenoid production observed in many important horticulture crops and depict recent progress in elucidating the genetic basis of the natural variation in the composition and amount of apocarotenoids. We propose that the illustration of biochemical, genetic, and evolutionary background of apocarotenoid diversity would not only accelerate the discovery of unknown biosynthetic and regulatory genes of bioactive apocarotenoids but also enable the identification of genetic variation of causal genes for marker-assisted improvement of aroma and color of fruits and vegetables and CRISPR-based next-generation metabolic engineering of high-value apocarotenoids.
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Simkin AJ. Carotenoids and Apocarotenoids in Planta: Their Role in Plant Development, Contribution to the Flavour and Aroma of Fruits and Flowers, and Their Nutraceutical Benefits. PLANTS (BASEL, SWITZERLAND) 2021; 10:plants10112321. [PMID: 34834683 PMCID: PMC8624010 DOI: 10.3390/plants10112321] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 10/22/2021] [Accepted: 10/26/2021] [Indexed: 05/05/2023]
Abstract
Carotenoids and apocarotenoids are diverse classes of compounds found in nature and are important natural pigments, nutraceuticals and flavour/aroma molecules. Improving the quality of crops is important for providing micronutrients to remote communities where dietary variation is often limited. Carotenoids have also been shown to have a significant impact on a number of human diseases, improving the survival rates of some cancers and slowing the progression of neurological illnesses. Furthermore, carotenoid-derived compounds can impact the flavour and aroma of crops and vegetables and are the origin of important developmental, as well as plant resistance compounds required for defence. In this review, we discuss the current research being undertaken to increase carotenoid content in plants and research the benefits to human health and the role of carotenoid derived volatiles on flavour and aroma of fruits and vegetables.
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Affiliation(s)
- Andrew J. Simkin
- School of Biosciences, University of Kent, Canterbury CT2 7NJ, UK; or
- Crop Science and Production Systems, NIAB-EMR, New Road, East Malling, Kent ME19 6BJ, UK
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18
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Li D, Wang H, Wang M, Li G, Chen Z, Leiser WL, Weiß TM, Lu X, Wang M, Chen S, Chen F, Yuan L, Würschum T, Liu W. Genetic Dissection of Phosphorus Use Efficiency in a Maize Association Population under Two P Levels in the Field. Int J Mol Sci 2021; 22:9311. [PMID: 34502218 PMCID: PMC8430673 DOI: 10.3390/ijms22179311] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Revised: 08/22/2021] [Accepted: 08/25/2021] [Indexed: 11/24/2022] Open
Abstract
Phosphorus (P) deficiency is an important challenge the world faces while having to increase crop yields. It is therefore necessary to select maize (Zea may L.) genotypes with high phosphorus use efficiency (PUE). Here, we extensively analyzed the biomass, grain yield, and PUE-related traits of 359 maize inbred lines grown under both low-P and normal-P conditions. A significant decrease in grain yield per plant and biomass, an increase in PUE under low-P condition, as well as significant correlations between the two treatments were observed. In a genome-wide association study, 49, 53, and 48 candidate genes were identified for eleven traits under low-P, normal-P conditions, and in low-P tolerance index (phenotype under low-P divided by phenotype under normal-P condition) datasets, respectively. Several gene ontology pathways were enriched for the genes identified under low-P condition. In addition, seven key genes related to phosphate transporter or stress response were molecularly characterized. Further analyses uncovered the favorable haplotype for several core genes, which is less prevalent in modern lines but often enriched in a specific subpopulation. Collectively, our research provides progress in the genetic dissection and molecular characterization of PUE in maize.
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Affiliation(s)
- Dongdong Li
- Key Laboratory of Crop Heterosis and Utilization, the Ministry of Education, Key Laboratory of Crop Genetic Improvement, Beijing Municipality, National Maize Improvement Center, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China; (D.L.); (H.W.); (M.W.); (G.L.); (X.L.); (M.W.); (S.C.)
| | - Haoying Wang
- Key Laboratory of Crop Heterosis and Utilization, the Ministry of Education, Key Laboratory of Crop Genetic Improvement, Beijing Municipality, National Maize Improvement Center, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China; (D.L.); (H.W.); (M.W.); (G.L.); (X.L.); (M.W.); (S.C.)
| | - Meng Wang
- Key Laboratory of Crop Heterosis and Utilization, the Ministry of Education, Key Laboratory of Crop Genetic Improvement, Beijing Municipality, National Maize Improvement Center, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China; (D.L.); (H.W.); (M.W.); (G.L.); (X.L.); (M.W.); (S.C.)
| | - Guoliang Li
- Key Laboratory of Crop Heterosis and Utilization, the Ministry of Education, Key Laboratory of Crop Genetic Improvement, Beijing Municipality, National Maize Improvement Center, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China; (D.L.); (H.W.); (M.W.); (G.L.); (X.L.); (M.W.); (S.C.)
| | - Zhe Chen
- Key Laboratory of Plant-Soil Interaction, the Ministry of Education, Center for Resources, Environment and Food Security, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China; (Z.C.); (F.C.); (L.Y.)
| | - Willmar L. Leiser
- State Plant Breeding Institute, University of Hohenheim, 70593 Stuttgart, Germany; (W.L.L.); (T.M.W.)
| | - Thea Mi Weiß
- State Plant Breeding Institute, University of Hohenheim, 70593 Stuttgart, Germany; (W.L.L.); (T.M.W.)
- Institute of Plant Breeding, Seed Science and Population Genetics, University of Hohenheim, 70593 Stuttgart, Germany;
| | - Xiaohuan Lu
- Key Laboratory of Crop Heterosis and Utilization, the Ministry of Education, Key Laboratory of Crop Genetic Improvement, Beijing Municipality, National Maize Improvement Center, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China; (D.L.); (H.W.); (M.W.); (G.L.); (X.L.); (M.W.); (S.C.)
- Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Ming Wang
- Key Laboratory of Crop Heterosis and Utilization, the Ministry of Education, Key Laboratory of Crop Genetic Improvement, Beijing Municipality, National Maize Improvement Center, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China; (D.L.); (H.W.); (M.W.); (G.L.); (X.L.); (M.W.); (S.C.)
| | - Shaojiang Chen
- Key Laboratory of Crop Heterosis and Utilization, the Ministry of Education, Key Laboratory of Crop Genetic Improvement, Beijing Municipality, National Maize Improvement Center, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China; (D.L.); (H.W.); (M.W.); (G.L.); (X.L.); (M.W.); (S.C.)
| | - Fanjun Chen
- Key Laboratory of Plant-Soil Interaction, the Ministry of Education, Center for Resources, Environment and Food Security, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China; (Z.C.); (F.C.); (L.Y.)
| | - Lixing Yuan
- Key Laboratory of Plant-Soil Interaction, the Ministry of Education, Center for Resources, Environment and Food Security, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China; (Z.C.); (F.C.); (L.Y.)
| | - Tobias Würschum
- Institute of Plant Breeding, Seed Science and Population Genetics, University of Hohenheim, 70593 Stuttgart, Germany;
| | - Wenxin Liu
- Key Laboratory of Crop Heterosis and Utilization, the Ministry of Education, Key Laboratory of Crop Genetic Improvement, Beijing Municipality, National Maize Improvement Center, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China; (D.L.); (H.W.); (M.W.); (G.L.); (X.L.); (M.W.); (S.C.)
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19
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Lu S, Ye J, Zhu K, Zhang Y, Zhang M, Xu Q, Deng X. A Citrus Phosphate Starvation Response Factor CsPHL3 Negatively Regulates Carotenoid Metabolism. PLANT & CELL PHYSIOLOGY 2021; 62:482-493. [PMID: 33493291 DOI: 10.1093/pcp/pcab007] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Accepted: 01/12/2021] [Indexed: 06/12/2023]
Abstract
Carotenoids provide precursors for the biosynthesis of strigolactones, which are a new class of hormones that are essential in phosphate (Pi) signaling during plant development. Carotenoid metabolism is a finely tuned pathway, but our understanding of the regulation mechanisms is still limited. In this study, we isolated a protein designated as CsPHL3 from citrus. CsPHL3 belonged to the Pi starvation response factor (PHR)-like subclade and was upregulated by low Pi. Acting as a nucleus-localized protein with transactivation activity, CsPHL3 bound directly to activate the promoter of a key metabolic gene, lycopene β-cyclase1 (LCYb1). Transgenic analysis revealed that the CsPHL3-overexpressing tomato plants exhibited abnormal growth, like the plants grew under limited Pi conditions. The transgenic lines showed reduced carotenoid contents and elevated expression of LCYb genes but downregulation of other key carotenogenic genes, including phytoene synthase (PSY). Moreover, CsPHL3 induced anthocyanin biosynthesis and affected Pi signaling in the transgenic plants. We further demonstrated that the expression of PSY was negatively regulated by CsPHL3 and high Pi. It is concluded that CsPHL3 is a Pi starvation response factor that negatively regulates carotenoid metabolism by modulating the expression of carotenogenic genes. Establishment of the CsPHL3-CsLCYb1 network provides new valuable knowledge of the function and underlying mechanism of PHR transcription factors and expands our understanding of the complex regulation mechanisms of carotenoid biosynthesis.
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Affiliation(s)
- Suwen Lu
- Key Laboratory of Horticultural Plant Biology (Ministry of Education), Huazhong Agricultural University, Wuhan, China
| | - Junli Ye
- Key Laboratory of Horticultural Plant Biology (Ministry of Education), Huazhong Agricultural University, Wuhan, China
| | - Kaijie Zhu
- Key Laboratory of Horticultural Plant Biology (Ministry of Education), Huazhong Agricultural University, Wuhan, China
| | - Yin Zhang
- Key Laboratory of Horticultural Plant Biology (Ministry of Education), Huazhong Agricultural University, Wuhan, China
| | | | - Qiang Xu
- Key Laboratory of Horticultural Plant Biology (Ministry of Education), Huazhong Agricultural University, Wuhan, China
| | - Xiuxin Deng
- Key Laboratory of Horticultural Plant Biology (Ministry of Education), Huazhong Agricultural University, Wuhan, China
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20
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Moreno JC, Mi J, Alagoz Y, Al‐Babili S. Plant apocarotenoids: from retrograde signaling to interspecific communication. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2021; 105:351-375. [PMID: 33258195 PMCID: PMC7898548 DOI: 10.1111/tpj.15102] [Citation(s) in RCA: 86] [Impact Index Per Article: 28.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Revised: 11/12/2020] [Accepted: 11/19/2020] [Indexed: 05/08/2023]
Abstract
Carotenoids are isoprenoid compounds synthesized by all photosynthetic and some non-photosynthetic organisms. They are essential for photosynthesis and contribute to many other aspects of a plant's life. The oxidative breakdown of carotenoids gives rise to the formation of a diverse family of essential metabolites called apocarotenoids. This metabolic process either takes place spontaneously through reactive oxygen species or is catalyzed by enzymes generally belonging to the CAROTENOID CLEAVAGE DIOXYGENASE family. Apocarotenoids include the phytohormones abscisic acid and strigolactones (SLs), signaling molecules and growth regulators. Abscisic acid and SLs are vital in regulating plant growth, development and stress response. SLs are also an essential component in plants' rhizospheric communication with symbionts and parasites. Other apocarotenoid small molecules, such as blumenols, mycorradicins, zaxinone, anchorene, β-cyclocitral, β-cyclogeranic acid, β-ionone and loliolide, are involved in plant growth and development, and/or contribute to different processes, including arbuscular mycorrhiza symbiosis, abiotic stress response, plant-plant and plant-herbivore interactions and plastid retrograde signaling. There are also indications for the presence of structurally unidentified linear cis-carotene-derived apocarotenoids, which are presumed to modulate plastid biogenesis and leaf morphology, among other developmental processes. Here, we provide an overview on the biology of old, recently discovered and supposed plant apocarotenoid signaling molecules, describing their biosynthesis, developmental and physiological functions, and role as a messenger in plant communication.
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Affiliation(s)
- Juan C. Moreno
- Max Planck Institut für Molekulare PflanzenphysiologieAm Mühlenberg 1Potsdam14476Germany
- Division of Biological and Environmental Sciences and EngineeringCenter for Desert Agriculturethe BioActives LabKing Abdullah University of Science and TechnologyThuwal23955‐6900Kingdom of Saudi Arabia
| | - Jianing Mi
- Division of Biological and Environmental Sciences and EngineeringCenter for Desert Agriculturethe BioActives LabKing Abdullah University of Science and TechnologyThuwal23955‐6900Kingdom of Saudi Arabia
| | - Yagiz Alagoz
- Division of Biological and Environmental Sciences and EngineeringCenter for Desert Agriculturethe BioActives LabKing Abdullah University of Science and TechnologyThuwal23955‐6900Kingdom of Saudi Arabia
- Hawkesbury Institute for the EnvironmentWestern Sydney UniversityLocked Bag 1797PenrithNSW2751Australia
| | - Salim Al‐Babili
- Division of Biological and Environmental Sciences and EngineeringCenter for Desert Agriculturethe BioActives LabKing Abdullah University of Science and TechnologyThuwal23955‐6900Kingdom of Saudi Arabia
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