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Xu M, Du Y, Hou X, Zhang Z, Yan N. Chemical structures, biosynthesis, bioactivities, and utilisation values for the diterpenes produced in tobacco trichomes. PHYTOCHEMISTRY 2024; 223:114117. [PMID: 38697243 DOI: 10.1016/j.phytochem.2024.114117] [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: 12/10/2023] [Revised: 03/26/2024] [Accepted: 04/28/2024] [Indexed: 05/04/2024]
Abstract
Cembranoids and labdanes are two important types of diterpenes in tobacco (Nicotiana genus) that are predominantly found in the leaf and flower glandular trichome secretions. This is the first systematic review of the biosynthesis, chemical structures, bioactivities, and utilisation values of cembranoid and labdane diterpenes in tobacco. A total of 131 natural cembranoid diterpenes have been reported in tobacco since 1962; these were summarised and classified according to their chemical structure characteristics as isopropyl cembranoids (1-88), seco-cembranoids (89-103), chain cembranoids (104-123), and polycyclic cembranoids (124-131). Forty natural labdane diterpenes reported since 1961 were also summarised and divided into epoxy side chain labdanes (132-150) and epoxy-free side chain labdanes (151-171). Tobacco cembranoid and labdane diterpenes are both formed via the methylerythritol 4-phosphate pathway and are synthesised from geranylgeranyl diphosphate. Their biosynthetic pathways and the four key enzymes (cembratrienol synthase, cytochrome P450 hydroxylase, copalyl diphosphate synthase, and Z-abienol cyclase) that affect their biosynthesis have been described in detail. A systematic summary of the bioactivity and utilisation values of the cembranoid and labdane diterpenes is also provided. The agricultural bioactivities associated with cembranoid and labdane diterpenes include antimicrobial and insecticidal activities as well as induced resistance, while the medical bioactivities include cytotoxic and neuroprotective activities. Further research into the cembranoid and labdane diterpenes will help to promote their development and utilisation as plant-derived pesticides and medicines.
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Affiliation(s)
- Minglei Xu
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao, 266101, China; Graduate School of Chinese Academy of Agricultural Sciences, Beijing, 100081, China
| | - Yongmei Du
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao, 266101, China.
| | - Xiaodong Hou
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao, 266101, China
| | - Zhongfeng Zhang
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao, 266101, China
| | - Ning Yan
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao, 266101, China.
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Du Z, Tian T, Gao Y, Guan J, Ju F, Bian S, Wang J, Lin X, Wang B, Liao Z, Du Y, Zhang Z, Zhang H. Investigating the spatiotemporal expression of CBTS genes lead to the discovery of tobacco root as a cembranoid-producing organ. FRONTIERS IN PLANT SCIENCE 2024; 15:1341324. [PMID: 38872887 PMCID: PMC11169922 DOI: 10.3389/fpls.2024.1341324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Accepted: 05/07/2024] [Indexed: 06/15/2024]
Abstract
Tobacco cembranoids, known for their anti-insect and antifungal properties, were shown to be mainly present on the surface of leaves and flowers, being biosynthesized by their trichomes. It remains unclear whether they could be biosynthesized in other organs without trichomes. Cembratrien-ol synthases (CBTSs) catalyze the conversion of GGPP to CBT-ols and thus play an important role in cembranoid biosynthesis. This study identified the CBTS family genes in tobacco and examined their spatiotemporal expression patterns. The CBTS genes showed diverse expression patterns in tobacco organs, with the majority highly expressed in leaves and a few highly expressed in flowers. The expression of CBTS genes were also correlated with the development of tobacco plants, and most of them showed the highest expression level at the budding stage. Furthermore, their expression is mediated by the JA (jasmonate) signaling in all tobacco organs. Several CBTS genes were found to be highly expressed in tobacco roots that have no trichomes, which prompted us to determine the cembranoid production in roots and other organs. GC-MS and UPLC assays revealed that cembranoids were produced in all tobacco organs, which was supported by the bioactivity assay results that almost all these CBTS enzymes could catalyze CBT-ol biosyntheis in yeast, and that the content ratio of CBT-ols and CBT-diols in tobacco roots was different to that in leaves. This work sheds insights into the expression profiles of tobacco CBTS genes and provides a feasibility to engineer tobacco roots for industrial production of cembranoids.
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Affiliation(s)
- Zaifeng Du
- Key Laboratory of Synthetic Biology of Ministry of Agriculture and Rural Affairs, Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao, China
| | - Tian Tian
- Key Laboratory of Synthetic Biology of Ministry of Agriculture and Rural Affairs, Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao, China
| | - Yulong Gao
- Tobacco Breeding and Biotechnology Research Center, Yunnan Academy of Tobacco Agricultural Sciences, Kunming, China
| | - Jian Guan
- Key Laboratory of Synthetic Biology of Ministry of Agriculture and Rural Affairs, Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao, China
| | - Fuzhu Ju
- Key Laboratory of Synthetic Biology of Ministry of Agriculture and Rural Affairs, Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao, China
| | - Shiquan Bian
- Key Laboratory of Synthetic Biology of Ministry of Agriculture and Rural Affairs, Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao, China
| | - Jiahao Wang
- Key Laboratory of Synthetic Biology of Ministry of Agriculture and Rural Affairs, Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao, China
| | - Xiaoyang Lin
- Key Laboratory of Synthetic Biology of Ministry of Agriculture and Rural Affairs, Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao, China
| | - Bingwu Wang
- Tobacco Breeding and Biotechnology Research Center, Yunnan Academy of Tobacco Agricultural Sciences, Kunming, China
| | - Zhihua Liao
- School of Life Sciences, Southwest University, Chongqing, China
| | - Yongmei Du
- Key Laboratory of Synthetic Biology of Ministry of Agriculture and Rural Affairs, Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao, China
| | - Zhongfeng Zhang
- Key Laboratory of Synthetic Biology of Ministry of Agriculture and Rural Affairs, Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao, China
| | - Hongbo Zhang
- Key Laboratory of Synthetic Biology of Ministry of Agriculture and Rural Affairs, Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao, China
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Zhang H, Sui Y, Liu W, Yan M, Wang Z, Yan X, Cui H. Identification of a cis-element for long glandular trichome-specific gene expression, which is targeted by a HD-ZIP IV protein. Int J Biol Macromol 2024; 264:130579. [PMID: 38432280 DOI: 10.1016/j.ijbiomac.2024.130579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2024] [Revised: 02/29/2024] [Accepted: 02/29/2024] [Indexed: 03/05/2024]
Abstract
Glandular trichomes are epidermal outgrowths that secret a variety of secondary metabolites, which not only help plants adapt to environmental stresses but also have important commercial value in fragrances, pharmaceuticals, and pesticides. In Nicotiana tabacum, it has been confirmed that a B-type cyclin, CycB2, negatively regulates the formation of long glandular trichomes (LGTs). This study aimed to identify the upstream regulatory gene involved in LGT formation by screening LGT-specific cis-elements within the NtCycB2 promoter. Using GUS as a reporter gene, the tissue-driven ability of NtCycB2 promoter showed that NtCycB2 promoter could drive GUS expression specifically in LGTs. Function analysis of a series of successive 5' truncations and synthetic segments of the NtCycB2 promoter indicated that the 87-bp region from -1221 to -1134 of the NtCycB2 promoter was required for gene expression in LGTs, and the L1-element (5'-AAAATTAATAAGAG-3') located in the 87-bp region contributed to the gene expression in the stalk of LGTs. Further Y1H and LUC assays confirmed that this L1-element exclusively binds to a HD-Zip IV protein, NtHD13. Gene function analysis revealed that NtHD13 positively controlled LGT formation, as overexpression of NtHD13 resulted in a high number of LGTs, whereas knockout of NtHD13 led to a decrease in LGTs. These findings demonstrate that NtHD13 can bind to an L1-element within the NtCycB2 promoter to regulate LGT formation.
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Affiliation(s)
- Hongying Zhang
- Key Laboratory for Cultivation of Tobacco Industry, College of Tobacco Science, Henan Agricultural University, Zhengzhou 450002, China
| | - Yalin Sui
- Key Laboratory for Cultivation of Tobacco Industry, College of Tobacco Science, Henan Agricultural University, Zhengzhou 450002, China
| | - Wei Liu
- Key Laboratory for Cultivation of Tobacco Industry, College of Tobacco Science, Henan Agricultural University, Zhengzhou 450002, China
| | - Meiqi Yan
- Key Laboratory for Cultivation of Tobacco Industry, College of Tobacco Science, Henan Agricultural University, Zhengzhou 450002, China
| | - Zhaojun Wang
- Key Laboratory for Cultivation of Tobacco Industry, College of Tobacco Science, Henan Agricultural University, Zhengzhou 450002, China
| | - Xiaoxiao Yan
- Key Laboratory for Cultivation of Tobacco Industry, College of Tobacco Science, Henan Agricultural University, Zhengzhou 450002, China
| | - Hong Cui
- Key Laboratory for Cultivation of Tobacco Industry, College of Tobacco Science, Henan Agricultural University, Zhengzhou 450002, China.
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Gossart N, Berhin A, Sergeant K, Alam I, André C, Hausman JF, Boutry M, Hachez C. Engineering Nicotiana tabacum trichomes for triterpenic acid production. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2023; 328:111573. [PMID: 36563941 DOI: 10.1016/j.plantsci.2022.111573] [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: 08/10/2022] [Revised: 12/13/2022] [Accepted: 12/15/2022] [Indexed: 06/17/2023]
Abstract
In this work, we aimed at implementing the biosynthesis of triterpenic acids in Nicotiana tabacum glandular trichomes. Although endogenous genes coding for enzymes involved in such biosynthetic pathway are found in the Nicotiana tabacum genome, implementing such pathway specifically in glandular trichomes required to boost endogenous enzymatic activities. Five transgenes coding for a farnesyl-diphosphate synthase, a squalene synthase, a squalene epoxidase, a beta-amyrin synthase and a beta-amyrin 28-monooxygenase were introduced in N.tabacum, their expression being driven by pMALD1, a trichome-specific transcriptional promoter. This study aimed at testing whether sinking isoprenoid precursors localized in plastids, by exploiting potential cross-talks allowing the exchange of terpenoid pools from the chloroplast to the cytosol, could be a way to improve overall yield. By analyzing metabolites extracted from entire leaves, a low amount of ursolic acid was detected in plants expressing the five transgenes. Our study shows that the terpene biosynthetic pathway could be, in part, redirected in N.tabacum glandular trichomes with no deleterious phenotype at the whole plant level (chlorosis, dwarfism,…). In light of our results, possible ways to improve the final yield are discussed.
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Affiliation(s)
- Nicola Gossart
- Louvain Institute of Biomolecular Science and Technology, UCLouvain, Louvain-la-Neuve, Belgium
| | - Alice Berhin
- Louvain Institute of Biomolecular Science and Technology, UCLouvain, Louvain-la-Neuve, Belgium
| | - Kjell Sergeant
- Environmental Research and Innovation, Luxembourg Institute of Science and Technology, Esch-sur-Alzette, Luxembourg
| | - Iftekhar Alam
- Louvain Institute of Biomolecular Science and Technology, UCLouvain, Louvain-la-Neuve, Belgium; Plant Biotechnology Division, National Institute of Biotechnology, Ganakbari, Ashulia, Savar, Dhaka 1349, Bangladesh
| | - Christelle André
- Environmental Research and Innovation, Luxembourg Institute of Science and Technology, Esch-sur-Alzette, Luxembourg; The New Zealand Institute for Plant and Food Research Ltd (PFR), Private Bag 92169, Auckland, New Zealand
| | - Jean-François Hausman
- Environmental Research and Innovation, Luxembourg Institute of Science and Technology, Esch-sur-Alzette, Luxembourg
| | - Marc Boutry
- Louvain Institute of Biomolecular Science and Technology, UCLouvain, Louvain-la-Neuve, Belgium
| | - Charles Hachez
- Louvain Institute of Biomolecular Science and Technology, UCLouvain, Louvain-la-Neuve, Belgium.
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Zhao L, Shang S, Tian Y, Gao Y, Song Z, Peng L, Li Z, Wang B. Integrative analysis of sensory evaluation and non-targeted metabolomics to unravel tobacco leaf metabolites associated with sensory quality of heated tobacco. FRONTIERS IN PLANT SCIENCE 2023; 14:1123100. [PMID: 36844088 PMCID: PMC9944805 DOI: 10.3389/fpls.2023.1123100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Accepted: 01/26/2023] [Indexed: 06/18/2023]
Abstract
INTRODUCTION Heated tobacco (Nicotiana tabacum L.) products are heating tobacco plug at a temperature of 350°C and produce different emissions in aerosol and sensory perceptions of tobacco leaf compared with combustible tobacco. Previous study assessed different tobacco varieties in heated tobacco for sensory quality and analyzed the links between sensory scores of the final products and certain chemical classes in tobacco leaf. However, contribution of individual metabolites to sensory quality of heated tobacco remains largely open for investigation. METHODS In present study, five tobacco varieties were evaluated as heated tobacco for sensory quality by an expert panel and the volatile and non-volatile metabolites were analyzed by non-targeted metabolomics profiling. RESULTS The five tobacco varieties had distinct sensory qualities and can be classified into higher and lower sensory rating classes. Principle component analysis and hierarchical cluster analysis showed that leaf volatile and non-volatile metabolome annotated were grouped and clustered by sensory ratings of heated tobacco. Orthogonal projections to latent structures discriminant analysis followed by variable importance in projection and fold-change analysis revealed 13 volatiles and 345 non-volatiles able to discriminate the tobacco varieties with higher and lower sensory ratings. Some compounds such as β-damascenone, scopoletin, chlorogenic acids, neochlorogenic acids, and flavonol glycosyl derivatives had strong contribution to the prediction of sensory quality of heated tobacco. Several lyso-phosphatidylcholine and lyso-phosphatidylethanolamine lipid species, and reducing and non-reducing sugar molecules were also positively related to sensory quality. DISCUSSION Taken together, these discriminating volatile and non-volatile metabolites support the role of leaf metabolites in affecting the sensory quality of heated tobacco and provide new information on the types of leaf metabolites that can be used to predict applicability of tobacco varieties for heated tobacco products.
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Affiliation(s)
- Lu Zhao
- National Tobacco Genetic Engineering Research Center, Yunnan Academy of Tobacco Agricultural Sciences, Kunming, Yunnan, China
| | - Shanzhai Shang
- Research and Development Center, China Tobacco Yunnan Industrial Co., Ltd., Kunming, Yunnan, China
| | - Yongfeng Tian
- Research and Development Center, China Tobacco Yunnan Industrial Co., Ltd., Kunming, Yunnan, China
| | - Yulong Gao
- National Tobacco Genetic Engineering Research Center, Yunnan Academy of Tobacco Agricultural Sciences, Kunming, Yunnan, China
| | - Zhongbang Song
- National Tobacco Genetic Engineering Research Center, Yunnan Academy of Tobacco Agricultural Sciences, Kunming, Yunnan, China
| | - Lijuan Peng
- Laboratory of Tobacco Chemistry, Yunnan Tobacco Quality Supervision and Test Station, Kunming, Yunnan, China
| | - Zhuolin Li
- Department of Technical Support, Malong Branch of Qujing Tobacco Company, Qujing, Yunnan, China
| | - Bingwu Wang
- National Tobacco Genetic Engineering Research Center, Yunnan Academy of Tobacco Agricultural Sciences, Kunming, Yunnan, China
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Yu J, Lei B, Zhao H, Wang B, Kakar KU, Guo Y, Zhang X, Jia M, Yang H, Zhao D. Cloning, characterization and functional analysis of NtMYB306a gene reveals its role in wax alkane biosynthesis of tobacco trichomes and stress tolerance. FRONTIERS IN PLANT SCIENCE 2022; 13:1005811. [PMID: 36275561 PMCID: PMC9583951 DOI: 10.3389/fpls.2022.1005811] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Accepted: 09/14/2022] [Indexed: 06/16/2023]
Abstract
Trichomes are specialized hair-like organs found on epidermal cells of many terrestrial plants, which protect plant from excessive transpiration and numerous abiotic and biotic stresses. However, the genetic basis and underlying mechanisms are largely unknown in Nicotiana tabacum (common tobacco), an established model system for genetic engineering and plant breeding. In present study, we identified, cloned and characterized an unknown function transcription factor NtMYB306a from tobacco cultivar K326 trichomes. Results obtained from sequence phylogenetic tree analysis showed that NtMYB306a-encoded protein belonged to S1 subgroup of the plants' R2R3-MYB transcription factors (TFs). Observation of the green fluorescent signals from NtMYB306a-GFP fusion protein construct exhibited that NtMYB306a was localized in nucleus. In yeast transactivation assays, the transformed yeast containing pGBKT7-NtMYB306a construct was able to grow on SD/-Trp-Ade+X-α-gal selection media, signifying that NtMYB306a exhibits transcriptional activation activity. Results from qRT-PCR, in-situ hybridization and GUS staining of transgenic tobacco plants revealed that NtMYB306a is primarily expressed in tobacco trichomes, especially tall glandular trichomes (TGTs) and short glandular trichomes (SGTs). RNA sequencing (RNA-seq) and qRT-PCR analysis of the NtMYB306a-overexpressing transgenic tobacco line revealed that NtMYB306a activated the expression of a set of key target genes which were associated with wax alkane biosynthesis. Gas Chromatography-Mass Spectrometry (GC-MS) exhibited that the total alkane contents and the contents of n-C28, n-C29, n-C31, and ai-C31 alkanes in leaf exudates of NtMYB306a-OE lines (OE-3, OE-13, and OE-20) were significantly greater when compared to WT. Besides, the promoter region of NtMYB306a contained numerous stress-responsive cis-acting elements, and their differential expression towards salicylic acid and cold stress treatments reflected their roles in signal transduction and cold-stress tolerance. Together, these results suggest that NtMYB306a is necessarily a positive regulator of alkane metabolism in tobacco trichomes that does not affect the number and morphology of tobacco trichomes, and that it can be used as a candidate gene for improving stress resistance and the quality of tobacco.
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Affiliation(s)
- Jing Yu
- Key Laboratory of Plant Resources Conservation and Germplasm Innovation in Mountainous Region (Ministry of Education), College of Life Sciences/Institute of Agro-bioengineering, Guizhou University, Guiyang, China
- Guizhou Academy of Tobacco Science, Molecular Genetics Key Laboratory of China Tobacco, Guiyang, China
| | - Bo Lei
- Guizhou Academy of Tobacco Science, Molecular Genetics Key Laboratory of China Tobacco, Guiyang, China
| | - Huina Zhao
- Guizhou Academy of Tobacco Science, Molecular Genetics Key Laboratory of China Tobacco, Guiyang, China
| | - Bing Wang
- Guizhou Academy of Tobacco Science, Molecular Genetics Key Laboratory of China Tobacco, Guiyang, China
| | - Kaleem U. Kakar
- Department of Microbiology, Baluchistan University of Information Technology and Managemnet Sciences, Quetta, Pakistan
| | - Yushuang Guo
- Guizhou Academy of Tobacco Science, Molecular Genetics Key Laboratory of China Tobacco, Guiyang, China
| | - Xiaolian Zhang
- Key Laboratory of Plant Resources Conservation and Germplasm Innovation in Mountainous Region (Ministry of Education), College of Life Sciences/Institute of Agro-bioengineering, Guizhou University, Guiyang, China
- Guizhou Academy of Tobacco Science, Molecular Genetics Key Laboratory of China Tobacco, Guiyang, China
| | - Mengao Jia
- Guizhou Academy of Tobacco Science, Molecular Genetics Key Laboratory of China Tobacco, Guiyang, China
| | - Hui Yang
- Guizhou Academy of Tobacco Science, Molecular Genetics Key Laboratory of China Tobacco, Guiyang, China
| | - Degang Zhao
- Key Laboratory of Plant Resources Conservation and Germplasm Innovation in Mountainous Region (Ministry of Education), College of Life Sciences/Institute of Agro-bioengineering, Guizhou University, Guiyang, China
- Plant Conservation Technology Center, Guizhou Key Laboratory of Agricultural Biotechnology, Guizhou Academy of Agricultural Sciences, Guiyang, China
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Sirirungruang S, Markel K, Shih PM. Plant-based engineering for production of high-valued natural products. Nat Prod Rep 2022; 39:1492-1509. [PMID: 35674317 DOI: 10.1039/d2np00017b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Covering: up to March 2022Plants are a unique source of complex specialized metabolites, many of which play significant roles in human society. In many cases, however, the availability of these metabolites from naturally occurring sources fails to meet current demands. Thus, there is much interest in expanding the production capacity of target plant molecules. Traditionally, plant breeding, chemical synthesis, and microbial fermentation are considered the primary routes towards large scale production of natural products. Here, we explore the advances, challenges, and future of plant engineering as a complementary path. Although plants are an integral part of our food and agricultural systems and sustain an extensive array of chemical constituents, their complex genetics and physiology have prevented the optimal exploitation of plants as a production chassis. We highlight emerging engineering tools and scientific advances developed in recent years that have improved the prospects of using plants as a sustainable and scalable production platform. We also discuss technological limitations and overall economic outlook of plant-based production of natural products.
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Affiliation(s)
- Sasilada Sirirungruang
- Department of Plant and Microbial Biology, University of California, Berkeley, CA, USA. .,Feedstocks Division, Joint BioEnergy Institute, Emeryville, CA, USA.,Environmental Genomics and Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA.,Center for Biomolecular Structure, Function and Application, Suranaree University of Technology, Nakhon Ratchasima, Thailand
| | - Kasey Markel
- Department of Plant and Microbial Biology, University of California, Berkeley, CA, USA. .,Feedstocks Division, Joint BioEnergy Institute, Emeryville, CA, USA.,Environmental Genomics and Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Patrick M Shih
- Department of Plant and Microbial Biology, University of California, Berkeley, CA, USA. .,Feedstocks Division, Joint BioEnergy Institute, Emeryville, CA, USA.,Environmental Genomics and Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA.,Innovative Genomics Institute, University of California, Berkeley, CA, USA
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Song Z, Wang P, Chen X, Peng Y, Cai B, Song J, Yin G, Jia S, Zhang H. Melatonin alleviates cadmium toxicity and abiotic stress by promoting glandular trichome development and antioxidant capacity in Nicotiana tabacum. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2022; 236:113437. [PMID: 35367878 DOI: 10.1016/j.ecoenv.2022.113437] [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: 01/19/2022] [Revised: 03/11/2022] [Accepted: 03/17/2022] [Indexed: 06/14/2023]
Abstract
Melatonin is a well-known signaling molecule that mediates a range of physiological activities and various stress reactions in plants. We comprehensively tested the effect of melatonin on the development of root hairs and glandular trichomes and found that melatonin pretreatment of tobacco seeds significantly increased the length of root hairs. Furthermore, melatonin-treated tobacco exhibited significantly higher density of trichomes and larger glandular heads on long-stalk glandular trichomes than untreated plants, which resulted in enhanced secretion in glandular trichomes. Exogenous melatonin enhanced the aphid resistance of plants by facilitating the accumulation of cembranoids in the glandular trichomes and alleviated cadmium toxicity by increasing the Cd-exudation capacity of long glandular trichomes. Metabolic analysis indicated that the contents of 108 metabolites significantly changed upon melatonin treatment, with the contents of those that are directly/indirectly involved in melatonin metabolism changing the most. Further, KEGG pathway analysis suggested that the metabolic pathways of amino acids, reducing sugar, secondary metabolites, indole alkaloid biosynthesis, purine, pyrimidine, and ABC transporters were greatly influenced by exogenous melatonin application. Moreover, metabolisms of melatonin-related antioxidants and pyrimidine nucleoside antibiotics were enhanced after melatonin treatment. Melatonin improved tobacco resistance to high salinity, drought, and extreme temperature stresses, as indicated by improved photosynthetic and antioxidant capacities in treated vs. untreated plants. This study lays a foundation for the comprehensive application of melatonin to increase the stress tolerance of plants.
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Affiliation(s)
- Zhaopeng Song
- Key Laboratory for Cultivation of Tobacco Industry, College of Tobacco Science, Henan Agricultural University, Zhengzhou 450002, China
| | - Pei Wang
- Key Laboratory for Cultivation of Tobacco Industry, College of Tobacco Science, Henan Agricultural University, Zhengzhou 450002, China
| | - Xiaolong Chen
- China Tobacco Henan Industrial Co. Ltd., Zhengzhou 450016, China
| | - Yufu Peng
- China Tobacco Henan Industrial Co. Ltd., Zhengzhou 450016, China
| | - Bin Cai
- Hainan Province Company, China National Tobacco Corporation, Haikou 571100, China
| | - Jiangyu Song
- Fujian Province Nanping Branch Company, China National Tobacco Corporation, Nanping 350003, China
| | - Guangting Yin
- China Tobacco Henan Industrial Co. Ltd., Zhengzhou 450016, China
| | - Shiwei Jia
- China Tobacco Henan Industrial Co. Ltd., Zhengzhou 450016, China
| | - Hongying Zhang
- Key Laboratory for Cultivation of Tobacco Industry, College of Tobacco Science, Henan Agricultural University, Zhengzhou 450002, China.
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Li H, Wang Z, Han K, Guo M, Zou Y, Zhang W, Ma W, Hua H. Cloning and functional identification of a Chilo suppressalis-inducible promoter of rice gene, OsHPL2. PEST MANAGEMENT SCIENCE 2020; 76:3177-3187. [PMID: 32336018 DOI: 10.1002/ps.5872] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Revised: 03/11/2020] [Accepted: 04/26/2020] [Indexed: 06/11/2023]
Abstract
BACKGROUND Promoters play a key role in driving insect-resistant genes during breeding of transgenic plants. In current transgenic procedures for breeding rice resistance to striped stem borer (Chilo suppressalis Walker, SSB), the constitutive promoter is used to drive the insect-resistant gene. To reduce the burden of constitutive promoters on plant growth, isolation and identification of insect-inducible promoters are particularly important. However, few promoters are induced specifically by insect feeding. RESULTS We found rice hydroperoxide lyase gene (OsHPL2) (LOC_Os02g12680) was upregulated after feeding by SSB. We subsequently cloned the promoter of OsHPL2 and analysed its expression pattern using the β-glucuronidase (GUS) reporter gene. Histochemical assays and quantitative analyses of GUS activity confirmed that P HPL2 :GUS was activated by SSB, but did not respond to brown planthopper (Nilaparvata lugens Stål, BPH) infestation, mechanical wounding or phytohormone treatments. A series of 5' truncated assays were conducted and three positive regulatory regions (-1452 to -1213, -903 to -624, and -376 to -176) induced by SSB infestation were identified. P2R123-min 35S and P2TR2-min 35S promoters linked with cry1C of transgenic plants showed the highest levels of Cry1C protein expression and SSB larval mortality. CONCLUSION We identified an SSB-inducible promoter and three positive internal regions. Transgenic rice plants with the OsHPL2 promoter and its positive regions driving cry1C exhibited the expected larvicidal effect on SSB. Our study is the first report of an SSB-inducible promoter that could be used as a potential resource for breeding insect-resistant transgenic crops. © 2020 Society of Chemical Industry.
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Affiliation(s)
- Hanpeng Li
- National Key Laboratory of Crop Genetic Improvement, National Centre of Plant Gene Research, Huazhong Agricultural University, Wuhan, China
- College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, China
| | - Zhengjie Wang
- College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, China
| | - Kehong Han
- College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, China
| | - Mengjian Guo
- College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, China
| | - Yulan Zou
- College of Life Science, Huazhong Agricultural University, Wuhan, China
| | - Wei Zhang
- National Key Laboratory of Crop Genetic Improvement, National Centre of Plant Gene Research, Huazhong Agricultural University, Wuhan, China
| | - Weihua Ma
- National Key Laboratory of Crop Genetic Improvement, National Centre of Plant Gene Research, Huazhong Agricultural University, Wuhan, China
- College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, China
| | - Hongxia Hua
- National Key Laboratory of Crop Genetic Improvement, National Centre of Plant Gene Research, Huazhong Agricultural University, Wuhan, China
- College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, China
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Nautiyal AK, Gani U, Sharma P, Kundan M, Fayaz M, Lattoo SK, Misra P. Comprehensive transcriptome analysis provides insights into metabolic and gene regulatory networks in trichomes of Nicotiana tabacum. PLANT MOLECULAR BIOLOGY 2020; 102:625-644. [PMID: 31965448 DOI: 10.1007/s11103-020-00968-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Accepted: 01/14/2020] [Indexed: 05/20/2023]
Abstract
KEY MESSAGE Comprehensive transcriptome analysis suggested that the primary metabolism is modulated to augment the supply of substrates towards secondary metabolism operating in the glandular trichomes of Nicotiana tabacum. The comparative gene expression and co-expression network analysis revealed that certain members of transcription factor genes belonging to the MYB, HD-ZIP, ERF, TCP, SRS, WRKY and DOF families may be involved in the regulation of metabolism and/other aspects in the glandular trichomes of N. tabacum The glandular trichomes of Nicotiana tabacum are highly productive in terms of secondary metabolites and therefore have been projected to be used as a prognostic platform for metabolic engineering of valuable natural products. For obvious reasons, detailed studies pertaining to the metabolic and gene regulatory networks operating in the glandular trichomes of N. tabacum are of pivotal significance to be undertaken. We have carried out next-generation sequencing of glandular trichomes of N. tabcaum and investigated differential gene expression among different tissues, including trichome-free leaves. We identified a total of 37,269 and 37,371 genes, expressing in trichome free leaf and glandular trichomes, respectively, at a cutoff of FPKM ≥ 1. The analysis revealed that different pathways involved with the primary metabolism are modulated in glandular trichomes of N. tabacum, providing a plausible explanation for the enhanced biosynthesis of secondary metabolism in the glandular trichomes. Further, comparative gene expression analysis revealed several genes, which display preferential expression in the glandular trichomes and thereby seem to be potential candidate genes for future studies in connection to the discovery of novel trichome specific promoters. The present study also led to the comprehensive identification of 1750 transcription factor genes expressing at a cutoff of FPKM ≥ 1 in the glandular trichomes of N. tabacum. The clustering and co-expression analysis suggested that transcription factor genes belonging to HD-ZIP, ERF, WRKY, MYB, TCP, SRS and DOF families may be the major players in the regulation of gene expression in the glandular trichomes of N. tabacum. To the best of our knowledge, the present work is the first effort towards detailed identification of genes, especially regulatory genes expressing in the glandular trichomes of N. tabacum. The data resource and the empirical findings from present work in all probability must, therefore, provide a reference and background context for future work aiming at deciphering molecular mechanism of regulation of secondary metabolism and gene expression in the glandular trichomes of N. tabacum.
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Affiliation(s)
- Abhishek Kumar Nautiyal
- Plant Biotechnology Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu Tawi, Jammu, 180001, India
- Academy of Scientific and Innovative Research (AcSIR), New Delhi, India
| | - Umar Gani
- Plant Biotechnology Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu Tawi, Jammu, 180001, India
- Academy of Scientific and Innovative Research (AcSIR), New Delhi, India
| | - Priyanka Sharma
- Plant Biotechnology Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu Tawi, Jammu, 180001, India
- Academy of Scientific and Innovative Research (AcSIR), New Delhi, India
| | - Maridul Kundan
- Plant Biotechnology Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu Tawi, Jammu, 180001, India
- Academy of Scientific and Innovative Research (AcSIR), New Delhi, India
| | - Mohd Fayaz
- Plant Biotechnology Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu Tawi, Jammu, 180001, India
- Academy of Scientific and Innovative Research (AcSIR), New Delhi, India
| | - Surrinder K Lattoo
- Plant Biotechnology Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu Tawi, Jammu, 180001, India
| | - Prashant Misra
- Plant Biotechnology Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu Tawi, Jammu, 180001, India.
- Academy of Scientific and Innovative Research (AcSIR), New Delhi, India.
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11
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Wang J, Zhang S, Fu Y, He T, Wang X. Analysis of Dynamic Global Transcriptional Atlas Reveals Common Regulatory Networks of Hormones and Photosynthesis Across Nicotiana Varieties in Response to Long-Term Drought. FRONTIERS IN PLANT SCIENCE 2020; 11:672. [PMID: 32528510 PMCID: PMC7266868 DOI: 10.3389/fpls.2020.00672] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Accepted: 04/29/2020] [Indexed: 05/16/2023]
Abstract
Land plants evolve drought acclimation. Existing knowledge of gene regulation mainly comes from short-term drought treatment. However, common regulatory mechanism shared by multiple varieties under long-term drought is little explored. Here we investigated changes in physiology, hormones and transcriptomes in leaves of Nicotiana varieties K326 and Basma Xanthi with/without drought treatment at time courses spanning 1 month. Analyses of deep RNA-Seq data and further full-length Iso-Seq data revealed an atlas of dynamic changes of transcripts, spliced isoforms, gene expression, associated Gene Ontology, and metabolism pathways. Fewer differentially expressed genes (DEGs) were induced by drought in high tolerance variety than susceptible variety. Comparison among seven hormone signal pathways identified that genes in both abscisic acid and auxin signaling pathways were highly induced although specific genes were depended on the variety. Common hormone regulatory network analysis revealed that genes encoding clade A protein phosphatase 2C gene (PP2C) in abscisic acid pathway was the pivotal hub. Expressional regulation in photosynthesis was also common and variety specific. We conclude that long-term drought inducing gene regulatory networks of hormones and photosynthesis are variety dependent, and PP2C is the center of the common hormone regulatory network. Thus, this study improves our understanding of gene regulatory network in drought response.
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Affiliation(s)
- Jing Wang
- College of Tobacco Science, Henan Agricultural University, Zhengzhou, China
| | - Shihua Zhang
- Department of Genetics, University of Georgia, Athens, GA, United States
- College of Life Science and Health, Wuhan University of Science and Technology, Wuhan, China
| | - Yunpeng Fu
- College of Tobacco Science, Henan Agricultural University, Zhengzhou, China
- *Correspondence: Yunpeng Fu,
| | - Tiantian He
- College of Tobacco Science, Henan Agricultural University, Zhengzhou, China
| | - Xuewen Wang
- Department of Genetics, University of Georgia, Athens, GA, United States
- Xuewen Wang,
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12
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Zhang H, Ma X, Li W, Niu D, Wang Z, Yan X, Yang X, Yang Y, Cui H. Genome-wide characterization of NtHD-ZIP IV: different roles in abiotic stress response and glandular Trichome induction. BMC PLANT BIOLOGY 2019; 19:444. [PMID: 31651252 PMCID: PMC6814048 DOI: 10.1186/s12870-019-2023-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Accepted: 09/10/2019] [Indexed: 05/12/2023]
Abstract
BACKGROUND The plant-specific homeodomain-leucine zipper class IV (HD-ZIP IV) gene family has been involved in the regulation of epidermal development. RESULTS Fifteen genes coding for HD-ZIP IV proteins were identified (NtHD-ZIP-IV-1 to NtHD-ZIP-IV-15) based on the genome of N. tabacum. Four major domains (HD, ZIP, SAD and START) were present in these proteins. Tissue expression pattern analysis indicated that NtHD-ZIP-IV-1, - 2, - 3, - 10, and - 12 may be associated with trichome development; NtHD-ZIP-IV-8 was expressed only in cotyledons; NtHD-ZIP-IV-9 only in the leaf and stem epidermis; NtHD-ZIP-IV-11 only in leaves; and NtHD-ZIP-IV-15 only in the root and stem epidermis. We found that jasmonates may induce the generation of glandular trichomes, and that NtHD-ZIP-IV-1, - 2, - 5, and - 7 were response to MeJA treatment. Dynamic expression under abiotic stress and after application of phytohormones indicated that most NtHD-ZIP IV genes were induced by heat, cold, salt and drought. Furthermore, most of these genes were induced by gibberellic acid, 6-benzylaminopurine, and salicylic acid, but were inhibited by abscisic acid. NtHD-ZIP IV genes were sensitive to heat, but insensitive to osmotic stress. CONCLUSION NtHD-ZIP IV genes are implicated in a complex regulatory gene network controlling epidermal development and abiotic stress responses. The present study provides evidence to elucidate the gene functions of NtHD-ZIP IVs during epidermal development and stress response.
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Affiliation(s)
- Hongying Zhang
- College of Tobacco Science, Henan Agricultural University, Zhengzhou, 450002 China
| | - Xudong Ma
- College of Tobacco Science, Henan Agricultural University, Zhengzhou, 450002 China
| | - Wenjiao Li
- College of Tobacco Science, Henan Agricultural University, Zhengzhou, 450002 China
| | - Dexin Niu
- College of Tobacco Science, Henan Agricultural University, Zhengzhou, 450002 China
| | - Zhaojun Wang
- College of Tobacco Science, Henan Agricultural University, Zhengzhou, 450002 China
| | - Xiaoxiao Yan
- College of Tobacco Science, Henan Agricultural University, Zhengzhou, 450002 China
| | - Xinling Yang
- Technology Center, China Tobacco Henan Industrial Co., Ltd, Zhengzhou, 450000 China
| | - Yongfeng Yang
- Technology Center, China Tobacco Henan Industrial Co., Ltd, Zhengzhou, 450000 China
| | - Hong Cui
- College of Tobacco Science, Henan Agricultural University, Zhengzhou, 450002 China
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13
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Yan N, Du Y, Liu X, Zhang H, Liu Y, Zhang Z. A Review on Bioactivities of Tobacco Cembranoid Diterpenes. Biomolecules 2019; 9:E30. [PMID: 30654586 PMCID: PMC6359560 DOI: 10.3390/biom9010030] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2018] [Revised: 12/27/2018] [Accepted: 01/14/2019] [Indexed: 01/08/2023] Open
Abstract
Cembranoids are carbocyclic diterpenes comprising four isoprene units and are natural products with a parent skeleton consisting of a 14-membered ring. They have gained wide interest in recent years and are a major hotspot in the research of natural product chemistry. Since 1962, various tobacco cembranoid diterpenes have been identified. This review systematically discusses and summarises the excellent antimicrobial, insecticidal, cytotoxic and neuroprotective activities of tobacco cembranoid diterpenes. These compounds show potential to be developed as botanical fungicides, cytotoxic drugs and drugs for the treatment of human immunodeficiency virus, Alzheimer's disease, Parkinson's disease, and other neurodegenerative diseases. However, there are relatively few studies on the structure⁻activity relationship (SAR) of tobacco cembranoid diterpenes. Therefore, future studies should focus on their structural modification, SAR and biogenic relationships.
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Affiliation(s)
- Ning Yan
- Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao 266101, China.
| | - Yongmei Du
- Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao 266101, China.
| | - Xinmin Liu
- Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao 266101, China.
| | - Hongbo Zhang
- Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao 266101, China.
| | - Yanhua Liu
- Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao 266101, China.
| | - Zhongfeng Zhang
- Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao 266101, China.
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14
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Hamachi A, Nisihara M, Saito S, Rim H, Takahashi H, Islam M, Uemura T, Ohnishi T, Ozawa R, Maffei ME, Arimura GI. Overexpression of geraniol synthase induces heat stress susceptibility in Nicotiana tabacum. PLANTA 2019; 249:235-249. [PMID: 30478473 DOI: 10.1007/s00425-018-3054-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Accepted: 11/14/2018] [Indexed: 06/09/2023]
Abstract
MAIN CONCLUSION Transgenic tobacco plants overexpressing the monoterpene alcohol geraniol synthase exhibit hypersensitivity to thermal stress, possibly due to suppressed sugar metabolism and transcriptional regulation of genes involved in thermal stress tolerance. Monoterpene alcohols function in plant survival strategies, but they may cause self-toxicity to plants due to their hydrophobic and highly reactive properties. To explore the role of these compounds in plant stress responses, we assessed transgenic tobacco plants overexpressing the monoterpene alcohol geraniol synthase (GES plants). Growth, morphology and photosynthetic efficiency of GES plants were not significantly different from those of control plants (wild-type and GUS-transformed plants). While GES plants' direct defenses against herbivores or pathogens were similar to those of control plants, their indirect defense (i.e., attracting herbivore enemy Nesidiocoris tenuis) was stronger compared to that of control plants. However, GES plants were susceptible to cold stress and even more susceptible to extreme heat stress (50 °C), as shown by decreased levels of sugar metabolites, invertase activity and its products (Glc and Fru), and leaf starch granules. Moreover, GES plants showed decreased transcription levels of the WRKY33 transcription factor gene and an aquaporin gene (PIP2). The results of this study show that GES plants exhibit enhanced indirect defense ability against herbivores, but conversely, GES plants exhibit hypersensitivity to heat stress due to suppressed sugar metabolism and gene regulation for thermal stress tolerance.
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Affiliation(s)
- Ashita Hamachi
- Department of Biological Science and Technology, Faculty of Industrial Science and Technology, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo, 125-8585, Japan
| | - Masahiro Nisihara
- Iwate Biotechnology Research Center, Kitakami, Iwate, 024-0003, Japan
| | - Shiori Saito
- Department of Biological Science and Technology, Faculty of Industrial Science and Technology, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo, 125-8585, Japan
| | - Hojun Rim
- Department of Biological Science and Technology, Faculty of Industrial Science and Technology, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo, 125-8585, Japan
| | | | - Monirul Islam
- Department of Life Sciences and Systems Biology, Plant Physiology Unit, University of Turin, Via Quarello15/A, I-10135, Turin, Italy
| | - Takuya Uemura
- Department of Biological Science and Technology, Faculty of Industrial Science and Technology, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo, 125-8585, Japan
| | - Toshiyuki Ohnishi
- College of Agriculture, Academic Institute, Shizuoka University, Shizuoka, 422-8529, Japan
- Research Institute of Green Science and Technology, Shizuoka University, Shizuoka, 422-8529, Japan
| | - Rika Ozawa
- Center for Ecological Research, Kyoto University, Otsu, 520-2113, Japan
| | - Massimo E Maffei
- Department of Life Sciences and Systems Biology, Plant Physiology Unit, University of Turin, Via Quarello15/A, I-10135, Turin, Italy
| | - Gen-Ichiro Arimura
- Department of Biological Science and Technology, Faculty of Industrial Science and Technology, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo, 125-8585, Japan.
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15
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Sui J, Wang C, Liu X, Fang N, Liu Y, Wang W, Yan N, Zhang HB, Du Y, Liu X, Lu T, Zhang Z, Zhang H. Formation of α- and β-Cembratriene-Diols in Tobacco ( Nicotiana tabacum L.) Is Regulated by Jasmonate-Signaling Components via Manipulating Multiple Cembranoid Synthetic Genes. Molecules 2018; 23:E2511. [PMID: 30274345 PMCID: PMC6222485 DOI: 10.3390/molecules23102511] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2018] [Revised: 09/25/2018] [Accepted: 09/28/2018] [Indexed: 11/16/2022] Open
Abstract
Cembranoids are a group of natural diterpenoid compounds with pharmaceutical potentials, and the cembratriene-diols produced by Nicotiana (tobacco) species display activities in anti-nicotine addiction and neuron protection. Although the enzymes catalyzing cembratriene-diols' formation in tobacco have been investigated, the regulatory mechanism underlying this physiological process remains unknown. This study has investigated the roles of phytohormone jasmonic acid (JA) in regulating cembratriene-diol formation in N. tabacum cv. TN90 and found that JA and COI1, the receptor protein of the bioactive derivative of JA (i.e., JA-Ile), display critical roles in regulating cembratriene-diols' formation and the expression of cembranoid synthetic genes CBTS, P450 and NtLTP1. Further studies showed that over-expressing either the gene encoding bHLH transcription factor MYC2a or that encoding MYB transcription factor MYB305 could upregulate the cembranoid synthetic genes and enhance the cembranoid production in plants with dysfunction of COI1. Further studies suggest that COI1 and its downstream regulators MYC2a and MYB305 also modulate the trichome secretion, which is correlated with cembranoid formation. Taken together, this study has demonstrated a critical role of JA-signaling components in governing the cembratriene-diol formation and the transcription of cembratriene-diol synthetic genes in tobacco. Findings in this study are of great importance to reveal the molecular regulatory mechanism underlying cembranoid synthesis.
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Affiliation(s)
- Jinkai Sui
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao 266101, China.
| | - Chunkai Wang
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao 266101, China.
| | - Xiaofeng Liu
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao 266101, China.
| | - Ning Fang
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao 266101, China.
| | - Yanhua Liu
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao 266101, China.
| | - Wenjing Wang
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao 266101, China.
| | - Ning Yan
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao 266101, China.
| | - Huai-Bao Zhang
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao 266101, China.
| | - Yongmei Du
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao 266101, China.
| | - Xinmin Liu
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao 266101, China.
| | - Tiegang Lu
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
| | - Zhongfeng Zhang
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao 266101, China.
| | - Hongbo Zhang
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao 266101, China.
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