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Lv W, Jiang H, Cao Q, Ren H, Wang X, Wang Y. A tau class glutathione S-transferase in tea plant, CsGSTU45, facilitates tea plant susceptibility to Colletotrichum camelliae infection mediated by jasmonate signaling pathway. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2024; 117:1356-1376. [PMID: 38059663 DOI: 10.1111/tpj.16567] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2023] [Revised: 10/10/2023] [Accepted: 11/20/2023] [Indexed: 12/08/2023]
Abstract
Tea plant [Camellia sinensis (L.) O. Kuntze], as one of the most important commercial crops, frequently suffers from anthracnose caused by Colletotrichum camelliae. The plant-specific tau (U) class of glutathione S-transferases (GSTU) participates in ROS homeostasis. Here, we identified a plant-specific GST tau class gene from tea plant, CsGSTU45, which is induced by various stresses, including C. camelliae infection, by analyzing multiple transcriptomes. CsGSTU45 plays a negative role in disease resistance against C. camelliae by accumulating H2 O2 . JA negatively regulates the resistance of tea plants against C. camelliae, which depends on CsGSTU45. CsMYC2.2, which is the key regulator in the JA signaling pathway, directly binds to and activates the promoter of CsGSTU45. Furthermore, silencing CsMYC2.2 increased disease resistance associated with reduced transcript and protein levels of CsGSTU45, and decreased contents of H2 O2 . Therefore, CsMYC2.2 suppresses disease resistance against C. camelliae by binding to the promoter of the CsGSTU45 gene and activating CsGSTU45. CsJAZ1 interacts with CsMYC2.2. Silencing CsJAZ1 attenuates disease resistance, upregulates the expression of CsMYC2.2 elevates the level of the CsGSTU45 protein, and promotes the accumulation of H2 O2 . As a result, CsJAZ1 interacts with CsMYC2.2 and acts as its repressor to suppress the level of CsGSTU45 protein, eventually enhancing disease resistance in tea plants. Taken together, the results show that the JA signaling pathway mediated by CsJAZ1-CsMYC2.2 modulates tea plant susceptibility to C. camelliae by regulating CsGSTU45 to accumulate H2 O2 .
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Affiliation(s)
- Wuyun Lv
- College of Tea Science and Tea Culture, Zhejiang A & F University, Hangzhou, 311300, Zhejiang, China
| | - Hong Jiang
- College of Tea Science and Tea Culture, Zhejiang A & F University, Hangzhou, 311300, Zhejiang, China
| | - Qinghai Cao
- College of Tea Science and Tea Culture, Zhejiang A & F University, Hangzhou, 311300, Zhejiang, China
| | - Henze Ren
- College of Tea Science and Tea Culture, Zhejiang A & F University, Hangzhou, 311300, Zhejiang, China
| | - Xinchao Wang
- Tea Research Institute, Chinese Academy of Agricultural Sciences/National Center for Tea Improvement/Key Laboratory of Biology, Genetics and Breeding of Special Economic Animals and Plants, Ministry of Agriculture and Rural Affairs, Hangzhou, 310008, Zhejiang, China
| | - Yuchun Wang
- College of Tea Science and Tea Culture, Zhejiang A & F University, Hangzhou, 311300, Zhejiang, China
- Tea Research Institute, Chinese Academy of Agricultural Sciences/National Center for Tea Improvement/Key Laboratory of Biology, Genetics and Breeding of Special Economic Animals and Plants, Ministry of Agriculture and Rural Affairs, Hangzhou, 310008, Zhejiang, China
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Hazra A, Ghosh S, Naskar S, Rahaman P, Roy C, Kundu A, Chaudhuri RK, Chakraborti D. Global transcriptome analysis reveals fungal disease responsive core gene regulatory landscape in tea. Sci Rep 2023; 13:17186. [PMID: 37821523 PMCID: PMC10567763 DOI: 10.1038/s41598-023-44163-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Accepted: 10/04/2023] [Indexed: 10/13/2023] Open
Abstract
Fungal infections are the inevitable limiting factor for productivity of tea. Transcriptome reprogramming recruits multiple regulatory pathways during pathogen infection. A comprehensive meta-analysis was performed utilizing previously reported, well-replicated transcriptomic datasets from seven fungal diseases of tea. The study identified a cumulative set of 18,517 differentially expressed genes (DEGs) in tea, implicated in several functional clusters, including the MAPK signaling pathway, transcriptional regulation, and the biosynthesis of phenylpropanoids. Gene set enrichment analyses under each pathogen stress elucidated that DEGs were involved in ethylene metabolism, secondary metabolism, receptor kinase activity, and various reactive oxygen species detoxification enzyme activities. Expressional fold change of combined datasets highlighting 2258 meta-DEGs shared a common transcriptomic response upon fungal stress in tea. Pervasive duplication events caused biotic stress-responsive core DEGs to appear in multiple copies throughout the tea genome. The co-expression network of meta-DEGs in multiple modules demonstrated the coordination of appropriate pathways, most of which involved cell wall organization. The functional coordination was controlled by a number of hub genes and miRNAs, leading to pathogenic resistance or susceptibility. This first-of-its-kind meta-analysis of host-pathogen interaction generated consensus candidate loci as molecular signatures, which can be associated with future resistance breeding programs in tea.
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Affiliation(s)
- Anjan Hazra
- Department of Genetics, University of Calcutta, 35, Ballygunge Circular Road, Kolkata, 700019, India
| | - Sanatan Ghosh
- Department of Genetics, University of Calcutta, 35, Ballygunge Circular Road, Kolkata, 700019, India
| | - Sudipta Naskar
- Department of Genetics, University of Calcutta, 35, Ballygunge Circular Road, Kolkata, 700019, India
| | - Piya Rahaman
- Department of Genetics, University of Calcutta, 35, Ballygunge Circular Road, Kolkata, 700019, India
| | - Chitralekha Roy
- Department of Genetics, University of Calcutta, 35, Ballygunge Circular Road, Kolkata, 700019, India
| | - Anirban Kundu
- Plant Genomics and Bioinformatics Laboratory, P.G. Department of Botany, Ramakrishna Mission Vivekananda Centenary College (Autonomous), Rahara, Kolkata, 700118, India
| | | | - Dipankar Chakraborti
- Department of Genetics, University of Calcutta, 35, Ballygunge Circular Road, Kolkata, 700019, India.
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Huang H, Li D, Jiang S, Yang R, Yang Y, Xia Z, Jiang X, Zhao Y, Wang D, Song B, Chen Z. Integrated Transcriptome and Proteome Analysis Reveals that the Antimicrobial Griseofulvin Targets Didymella segeticola Beta-Tubulin to Control Tea Leaf Spot. PHYTOPATHOLOGY 2023; 113:194-205. [PMID: 36173282 DOI: 10.1094/phyto-02-22-0061-r] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Because effective control measures are lacking, tea leaf spot caused by Didymella segeticola results in huge tea (Camellia sinensis) production losses on tea plantations in Guizhou Province, southwestern China. Screening for natural antimicrobial agents with higher control effects against this pathogen and studying their modes of action may contribute to disease management. Here, Penicillium griseofulvum-derived antimicrobial griseofulvin (GSF) can inhibit the hyphal growth of D. segeticola strain GZSQ-4, with a half-maximal effective concentration of 0.37 μg/ml in vitro and a higher curative efficacy at a lower dose of 25 μg/ml for detached tea twigs. GSF induces deformed and slightly curly hyphae with enlarged ends, with protoplasts agglutinated in the hyphae, and higher numbers of hyphal protuberances. GSF alters hyphal morphology and the subcellular structure's order. The integrated transcriptome and proteome data revealed that the transport of materials in cells, cellular movement, and mitosis were modulated by GSF. Molecular docking indicated that beta-tubulin was the most potent target of GSF, with a binding free energy of -13.59 kcal/mol, and microscale thermophoresis indicated that the dissociation constant (Kd) value of GSF binding to beta-tubulin 1, compared with beta-tubulin 2, was significantly lower. Thus, GSF potentially targets beta-tubulin 1 to disturb the chromosomal separation and fungal mitosis, thereby inhibiting hyphal growth.
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Affiliation(s)
- Hongke Huang
- Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, Guizhou, P.R. China
- College of Tea Science, Guizhou University, Guiyang, Guizhou, P.R. China
| | - Dongxue Li
- Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, Guizhou, P.R. China
| | - Shilong Jiang
- Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, Guizhou, P.R. China
- Agricultural College, Guizhou University, Guiyang, Guizhou, P.R. China
| | - Rui Yang
- Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, Guizhou, P.R. China
- Agricultural College, Guizhou University, Guiyang, Guizhou, P.R. China
| | - Yuqing Yang
- Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, Guizhou, P.R. China
- College of Tea Science, Guizhou University, Guiyang, Guizhou, P.R. China
| | - Zhongqiu Xia
- Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, Guizhou, P.R. China
- College of Tea Science, Guizhou University, Guiyang, Guizhou, P.R. China
| | - Xinyue Jiang
- Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, Guizhou, P.R. China
| | - Yongtian Zhao
- Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, Guizhou, P.R. China
- College of Life Science and Agriculture, Qiannan Normal University for Nationalities, Duyun, Guizhou, P.R. China
| | - Delu Wang
- College of Forestry, Guizhou University, Guiyang, Guizhou, P.R. China
| | - Baoan Song
- Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, Guizhou, P.R. China
| | - Zhuo Chen
- Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, Guizhou, P.R. China
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Jiang X, Jiang S, Huang H, Li D, Yang R, Yang Y, Wang D, Song B, Chen Z. Multi-Omics Analysis Reveals that the Antimicrobial Kasugamycin Potential Targets Nitrate Reductase in Didymella segeticola to Achieve Control of Tea Leaf Spot. PHYTOPATHOLOGY 2022; 112:1894-1906. [PMID: 35322715 DOI: 10.1094/phyto-11-21-0457-r] [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] [Indexed: 06/14/2023]
Abstract
Because of the lack of effective disease management measures, tea leaf spot-caused by the fungal phytopathogen Didymella segeticola (syn. Phoma segeticola)-is an important foliar disease. The important and widely used agricultural antimicrobial kasugamycin (Ksg), produced by the Gram-positive bacterium Streptomyces kasugaensis, effects high levels of control against crop diseases. The results of this study indicated that Ksg could inhibit the growth of D. segeticola hyphae in vitro with a half-maximal effective concentration (EC50) of 141.18 μg ml-1. Meanwhile, the curative effect in vivo on the pathogen in detached tea leaves also demonstrated that Ksg induced some morphological changes in organelles, septa, and cell walls as observed by optical microscopy and by scanning and transmission electron microscopy. This may indicate that Ksg disturbs biosynthesis of key metabolites, inhibiting hyphal growth. Integrated transcriptomic, proteomic, and bioinformatic analyses revealed that differentially expressed genes or differentially expressed proteins in D. segeticola hyphae in response to Ksg exposure were involved with metabolic processes and biosynthesis of secondary metabolites. Molecular docking studies indicated that Ksg may target nitrate reductase (NR), and microscale thermophoresis assay showed greater affinity with NR, potentially disturbing nitrogen assimilation and subsequent metabolism. The results indicated that Ksg inhibits the pathogen of tea leaf spot, D. segeticola, possibly by binding to NR, disturbing fungal metabolism, and inducing subsequent changes in hyphal growth and development.
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Affiliation(s)
- Xinyue Jiang
- Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, Guizhou 550025, China
| | - Shilong Jiang
- Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, Guizhou 550025, China
- Agricultural College, Guizhou University, Guiyang, Guizhou 550025, China
| | - Hongke Huang
- Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, Guizhou 550025, China
| | - Dongxue Li
- Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, Guizhou 550025, China
| | - Rui Yang
- Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, Guizhou 550025, China
| | - Yuanyou Yang
- Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, Guizhou 550025, China
| | - Delu Wang
- College of Forestry, Guizhou University, Guiyang, Guizhou 550025, China
| | - Baoan Song
- Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, Guizhou 550025, China
| | - Zhuo Chen
- Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, Guizhou 550025, China
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Wang Y, Yang Y, Jiang X, Shi J, Yang Y, Jiang S, Li Z, Wang D, Chen Z. The Sequence and Integrated Analysis of Competing Endogenous RNAs Originating from Tea Leaves Infected by the Pathogen of Tea Leaf Spot, Didymella segeticola. PLANT DISEASE 2022; 106:1286-1290. [PMID: 34433319 DOI: 10.1094/pdis-06-21-1324-a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Tea leaf spot, caused by Didymella segeticola, is an important disease which negatively affects the productivity and the quality of tea leaves. During infection by the pathogen, competing endogenous RNAs (ceRNAs) from tea leaves could contribute to achieving pathogenicity. In this study, circular RNAs (circRNAs) and long noncoding RNAs (lncRNAs), constituting ceRNAs, which share binding sites on microRNAs (miRNAs), and messenger RNAs (mRNAs) from infected and uninfected leaves of tea (Camellia sinensis 'Fuding-dabaicha') were sequenced and analyzed, and the identity and expression levels of the target genes of miRNA-mRNA and miRNA-lncRNA/circRNA were predicted. Analysis indicated that 10 mRNAs were bound by 20 miRNAs, 66 lncRNAs were bound by 40 miRNAs, and 17 circRNAs were bound by 29 miRNAs, respectively. For the regulation modes of ceRNAs, five ceRNA pairs were identified by the correlation analysis of lncRNA-miRNA-mRNA. For instance, expression of the xyloglucan endotransglycosylase gene in infected leaves was downregulated at the level of mRNA through miRNA PC-5p-3511474_3 binding with lncRNA TEA024202.1:MSTRG.37074.1. Gene annotation indicated that expression of this gene was significantly enriched in cell wall biogenesis and in the pathway of plant hormone signal transduction. The functional analysis of ceRNAs isolated from infected tea leaves will provide a valuable resource for future research on D. segeticola pathogenicity.
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Affiliation(s)
- Yu Wang
- Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, Guizhou 550025, China
- Agricultural College, Guizhou University, Guiyang, Guizhou 550025, China
| | - Yuanyou Yang
- Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, Guizhou 550025, China
| | - Xinyue Jiang
- Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, Guizhou 550025, China
| | - Jiayan Shi
- Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, Guizhou 550025, China
| | - Yuqin Yang
- Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, Guizhou 550025, China
- College of Tea Science, Guizhou University, Guiyang, Guizhou 550025, China
| | - Shilong Jiang
- Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, Guizhou 550025, China
- Agricultural College, Guizhou University, Guiyang, Guizhou 550025, China
| | - Zhong Li
- Agricultural College, Guizhou University, Guiyang, Guizhou 550025, China
| | - Delu Wang
- College of Forestry, Guizhou University, Guiyang, Guizhou 550025, China
| | - Zhuo Chen
- Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, Guizhou 550025, China
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Ren Y, Li D, Jiang S, Wang Y, Tang Q, Huang H, Wang D, Song B, Chen Z. Integration of Transcriptomic and Proteomic Data Reveals the Possible Action Mechanism of the Antimicrobial Zhongshengmycin Against Didymella segeticola, the Causal Agent of Tea Leaf Spot. PHYTOPATHOLOGY 2021; 111:2238-2249. [PMID: 33881912 DOI: 10.1094/phyto-02-21-0073-r] [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] [Indexed: 06/12/2023]
Abstract
Tea leaf spot, caused by the fungal phytopathogen Didymella segeticola, is an important foliar disease that can cause huge losses in the production and quality of tea, and there are no effective management measures to control the disease. This study screened a natural antimicrobial chemical for its activity against D. segeticola and studied its mode of action. Antifungal activity of the Streptomyces-derived antimicrobial zhongshengmycin (ZSM) against D. segeticola strain GZSQ-4 was assayed in vitro via the mycelial growth rate method. Optical microscopy and scanning and transmission electron microscopy were used to observe the morphological effects on hyphae treated with ZSM, with these studies complemented by transcriptomic, proteomic, and bioinformatic studies to identify the differentially expressed genes or differentially expressed proteins in hyphae treated with ZSM. Correlation analysis of transcriptomic and proteomic data were used to reveal the mode of action. The results indicated that ZSM could inhibit the growth of hyphae in vitro with a half-maximal effective concentration of 5.9 μg/ml, inducing some morphological changes in organelles, septa, and extracellular polysaccharides, targeting ribosomes to disturb translation, affecting the biosynthesis of some hyphal proteins at the messenger RNA and protein levels, and revealing correlations between findings from transcriptomes and proteomes.
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Affiliation(s)
- Yafeng Ren
- Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, Guizhou, China
| | - Dongxue Li
- Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, Guizhou, China
| | - Shilong Jiang
- Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, Guizhou, China
- Agricultural College, Guizhou University, Guiyang, Guizhou 550025, China
| | - Yu Wang
- Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, Guizhou, China
- Agricultural College, Guizhou University, Guiyang, Guizhou 550025, China
| | - Qin Tang
- Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, Guizhou, China
| | - Honglin Huang
- Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, Guizhou, China
| | - Delu Wang
- College of Forestry, Guizhou University, Guiyang, Guizhou 550025, China
| | - Baoan Song
- Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, Guizhou, China
| | - Zhuo Chen
- Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, Guizhou, China
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Bordoloi KS, Krishnatreya DB, Baruah PM, Borah AK, Mondal TK, Agarwala N. Genome-wide identification and expression profiling of chitinase genes in tea ( Camellia sinensis (L.) O. Kuntze) under biotic stress conditions. PHYSIOLOGY AND MOLECULAR BIOLOGY OF PLANTS : AN INTERNATIONAL JOURNAL OF FUNCTIONAL PLANT BIOLOGY 2021; 27:369-385. [PMID: 33707875 PMCID: PMC7907415 DOI: 10.1007/s12298-021-00947-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Revised: 02/03/2021] [Accepted: 02/09/2021] [Indexed: 05/05/2023]
Abstract
Chitinases are a diverse group of enzymes having the ability to degrade chitin. Chitin is the second most abundant polysaccharide on earth, predominantly found in insect exoskeletons and fungal cell walls. In this study, we performed a genome-wide search for chitinase genes and identified a total of 49 chitinases in tea. These genes were categorized into 5 classes, where an expansion of class V chitinases has been observed in comparison to other plant species. Extensive loss of introns in 46% of the GH18 chitinases indicates that an evolutionary pressure is acting upon these genes to lose introns for rapid gene expression. The promoter upstream regions in 65% of the predicted chitinases contain methyl-jasmonate, salicylic acid and defense responsive cis-acting elements, which may further illustrate the possible role of chitinases in tea plant's defense against various pests and pathogens. Differential expression analysis revealed that transcripts of two GH19 chitinases TEA028279 and TEA019397 got upregulated during three different fungal infections in tea. While GH19 chitinase TEA031377 showed an increase in transcript abundance in the two insect infested tea tissues. Semi-quantitative RT-PCR analysis revealed that five GH19 chitinases viz. TEA018892, TEA031484, TEA28279, TEA033470 and TEA031277 showed significant increase in expression in the tea plants challenged with a biotrophic pathogen Exobasidium vexans. The study endeavours in highlighting biotic stress responsive defensive role of chitinase genes in tea.
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Affiliation(s)
| | | | - Pooja Moni Baruah
- Department of Botany, Gauhati University, Jalukbari, Guwahati, Assam 781014 India
| | - Anuj Kumar Borah
- Department of Molecular Biology and Biotechnology, Tezpur University, Napaam, Sonitpur, Assam 784028 India
| | - Tapan Kumar Mondal
- ICAR-National Institute for Plant Biotechnology, LBS Building, Pusa, IARI, New Delhi, 110012 India
| | - Niraj Agarwala
- Department of Botany, Gauhati University, Jalukbari, Guwahati, Assam 781014 India
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