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Bandopadhyay L, Basu D, Ranjan Sikdar S. De novo transcriptome assembly and global analysis of differential gene expression of aphid tolerant wild mustard Rorippa indica (L.) Hiern infested by mustard aphid Lipaphis Erysimi (L.) Kaltenbach. Funct Integr Genomics 2024; 24:43. [PMID: 38418630 DOI: 10.1007/s10142-024-01323-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2024] [Revised: 02/14/2024] [Accepted: 02/15/2024] [Indexed: 03/02/2024]
Abstract
Rapeseed-mustard, the oleiferous Brassica species are important oilseed crops cultivated all over the globe. Mustard aphid Lipaphis erysimi (L.) Kaltenbach is a major threat to the cultivation of rapeseed-mustard. Wild mustard Rorippa indica (L.) Hiern shows tolerance to mustard aphids as a nonhost and hence is an important source for the bioprospecting of potential resistance genes and defense measures to manage mustard aphids sustainably. We performed mRNA sequencing of the R. indica plant uninfested and infested by the mustard aphids, harvested at 24 hours post-infestation. Following quality control, the high-quality reads were subjected to de novo assembly of the transcriptome. As there is no genomic information available for this potential wild plant, the raw reads will be useful for further bioinformatics analysis and the sequence information of the assembled transcripts will be helpful to design primers for the characterization of specific gene sequences. In this study, we also used the generated resource to comprehensively analyse the global profile of differential gene expression in R. indica in response to infestation by mustard aphids. The functional enrichment analysis of the differentially expressed genes reveals a significant immune response and suggests the possibility of chitin-induced defense signaling.
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Affiliation(s)
- Lekha Bandopadhyay
- Division of Plant Biology, Bose Institute, P 1/12, C. I. T. Road, Scheme VIIM, Kolkata, 700054, India.
| | - Debabrata Basu
- Division of Plant Biology, Bose Institute, P 1/12, C. I. T. Road, Scheme VIIM, Kolkata, 700054, India
| | - Samir Ranjan Sikdar
- Division of Plant Biology, Bose Institute, P 1/12, C. I. T. Road, Scheme VIIM, Kolkata, 700054, India.
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Tao T, Wang Z, Mao R, Hussain M, Arthurs SP, Ye F, An X, Gao J. Vermicompost Amendments Disrupt Feeding Behavior of Diaphorina citri Kuwayama and Boost Activities of Salicylic Acid and Jasmonic Acid Pathway-Related Enzymes in Citrus. INSECTS 2023; 14:insects14050410. [PMID: 37233038 DOI: 10.3390/insects14050410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 04/18/2023] [Accepted: 04/24/2023] [Indexed: 05/27/2023]
Abstract
Plants grown with vermicompost amendments are known to be harmful to sap-sucking insects, but the underlying mechanism remains to be determined. Here we investigated the feeding behavior of Diaphorina citri Kuwayama on Citrus limon (L.) Burm. F using the electrical penetration graph technique. Plants were grown in soil with different vermicompost rates (0%, 20%, 40%, and 60% w/w). Additionally, plants were tested for the activity of salicylic acid (SA) and jasmonic acid (JA) pathway-related enzymes. When compared to the control, vermicompost treatments (40% and 60%) decreased duration of phloem sap feeding and increased duration of the pathway phase of D. citri, and the 60% vermicompost made it more difficult for D. citri to reach and gain access to phloem sap. Enzymatic assays indicated that the 40% amendment rate increased phenylalanine ammonia lyase (involved in the SA pathway) and polyphenol oxidase (involved in the JA pathway), while the 60% amendment rate increased -1,3-glucanases (involved in the SA pathway) and lipoxygenase (involved in the JA pathway). The 20% amendment rate had no effect on feeding or enzyme activities. This study revealed that vermicompost amendments can reduce the efficiency of D. citri feeding, which may result from increased plant resistance via the SA and JA pathway.
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Affiliation(s)
- Tonglai Tao
- School of Life Sciences, South China Normal University, Guangzhou 510631, China
- Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangdong Public Laboratory of Wild Animal Conservation and Utilization, Guangdong Engineering Research Center for Mineral Oil Pesticides, Institute of Zoology, Guangdong Academy of Sciences, Guangzhou 510260, China
| | - Zhaohong Wang
- Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangdong Public Laboratory of Wild Animal Conservation and Utilization, Guangdong Engineering Research Center for Mineral Oil Pesticides, Institute of Zoology, Guangdong Academy of Sciences, Guangzhou 510260, China
| | - Runqian Mao
- Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangdong Public Laboratory of Wild Animal Conservation and Utilization, Guangdong Engineering Research Center for Mineral Oil Pesticides, Institute of Zoology, Guangdong Academy of Sciences, Guangzhou 510260, China
| | - Mubasher Hussain
- Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangdong Public Laboratory of Wild Animal Conservation and Utilization, Guangdong Engineering Research Center for Mineral Oil Pesticides, Institute of Zoology, Guangdong Academy of Sciences, Guangzhou 510260, China
| | | | - Fengxian Ye
- Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangdong Public Laboratory of Wild Animal Conservation and Utilization, Guangdong Engineering Research Center for Mineral Oil Pesticides, Institute of Zoology, Guangdong Academy of Sciences, Guangzhou 510260, China
| | - Xincheng An
- Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangdong Public Laboratory of Wild Animal Conservation and Utilization, Guangdong Engineering Research Center for Mineral Oil Pesticides, Institute of Zoology, Guangdong Academy of Sciences, Guangzhou 510260, China
| | - Jing Gao
- Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangdong Public Laboratory of Wild Animal Conservation and Utilization, Guangdong Engineering Research Center for Mineral Oil Pesticides, Institute of Zoology, Guangdong Academy of Sciences, Guangzhou 510260, China
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Weyer R, Hellmann MJ, Hamer-Timmermann SN, Singh R, Moerschbacher BM. Customized chitooligosaccharide production-controlling their length via engineering of rhizobial chitin synthases and the choice of expression system. Front Bioeng Biotechnol 2022; 10:1073447. [PMID: 36588959 PMCID: PMC9795070 DOI: 10.3389/fbioe.2022.1073447] [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: 10/18/2022] [Accepted: 11/28/2022] [Indexed: 12/15/2022] Open
Abstract
Chitooligosaccharides (COS) have attracted attention from industry and academia in various fields due to their diverse bioactivities. However, their conventional chemical production is environmentally unfriendly and in addition, defined and pure molecules are both scarce and expensive. A promising alternative is the in vivo synthesis of desired COS in microbial platforms with specific chitin synthases enabling a more sustainable production. Hence, we examined the whole cell factory approach with two well-established microorganisms-Escherichia coli and Corynebacterium glutamicum-to produce defined COS with the chitin synthase NodC from Rhizobium sp. GRH2. Moreover, based on an in silico model of the synthase, two amino acids potentially relevant for COS length were identified and mutated to direct the production. Experimental validation showed the influence of the expression system, the mutations, and their combination on COS length, steering the production from originally pentamers towards tetramers or hexamers, the latter virtually pure. Possible explanations are given by molecular dynamics simulations. These findings pave the way for a better understanding of chitin synthases, thus allowing a more targeted production of defined COS. This will, in turn, at first allow better research of COS' bioactivities, and subsequently enable sustainable large-scale production of oligomers.
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Twayana M, Girija AM, Mohan V, Shah J. Phloem: At the center of action in plant defense against aphids. JOURNAL OF PLANT PHYSIOLOGY 2022; 273:153695. [PMID: 35468314 DOI: 10.1016/j.jplph.2022.153695] [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: 10/04/2021] [Revised: 04/04/2022] [Accepted: 04/08/2022] [Indexed: 06/14/2023]
Abstract
The location of the phloem deep inside the plant, the high hydrostatic pressure in the phloem, and the composition of phloem sap, which is rich in sugar with a high C:N ratio, allows phloem sap feeding insects to occupy a unique ecological niche. The anatomy and physiology of aphids, a large group of phytophagous insects that use their mouthparts, which are modified into stylets, to consume large amounts of phloem sap, has allowed aphids to successfully exploit this niche, however, to the detriment of agriculture and horticulture. The ability to reproduce asexually, a short generation time, the development of resistance to commonly used insecticides, and their ability to vector viral diseases makes aphids among the most damaging pests of plants. Here we review how plants utilize their ability to occlude sieve elements and accumulate antibiotic and antinutritive factors in the phloem sap to limit aphid infestation. In addition, we summarize progress on understanding how plants perceive aphids to activate defenses in the phloem.
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Affiliation(s)
- Moon Twayana
- Department of Biological Sciences and BioDiscovery Institute, University of North Texas, Denton, TX, 76210, USA.
| | - Anil M Girija
- Department of Biological Sciences and BioDiscovery Institute, University of North Texas, Denton, TX, 76210, USA.
| | - Vijee Mohan
- Department of Biological Sciences and BioDiscovery Institute, University of North Texas, Denton, TX, 76210, USA.
| | - Jyoti Shah
- Department of Biological Sciences and BioDiscovery Institute, University of North Texas, Denton, TX, 76210, USA.
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Ngaki MN, Sahoo DK, Wang B, Bhattacharyya MK. Overexpression of a plasma membrane protein generated broad-spectrum immunity in soybean. PLANT BIOTECHNOLOGY JOURNAL 2021; 19:502-516. [PMID: 32954627 PMCID: PMC7957895 DOI: 10.1111/pbi.13479] [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: 03/19/2018] [Revised: 07/17/2020] [Accepted: 08/06/2020] [Indexed: 05/10/2023]
Abstract
Plants fight-off pathogens and pests by manifesting an array of defence responses using their innate immunity mechanisms. Here we report the identification of a novel soybean gene encoding a plasma membrane protein, transcription of which is suppressed following infection with the fungal pathogen, Fusarium virguliforme. Overexpression of the protein led to enhanced resistance against not only against F. virguliforme, but also against spider mites (Tetranychus urticae, Koch), soybean aphids (Aphis glycines, Matsumura) and soybean cyst nematode (Heterodera glycines). We, therefore, name this protein as Glycine max disease resistance 1 (GmDR1; Glyma.10g094800). The homologues of GmDR1 have been detected only in legumes, cocoa, jute and cotton. The deduced GmDR1 protein contains 73 amino acids. GmDR1 is predicted to contain an ecto- and two transmembrane domains. Transient expression of the green fluorescent protein fused GmDR1 protein in soybean leaves showed that it is a plasma membrane protein. We investigated if chitin, a pathogen-associated molecular pattern (PAMP), common to all pathogen and pests considered in this study, can significantly enhance defence pathways among the GmDR1-overexpressed transgenic soybean lines. Chitin induces marker genes of the salicylic- and jasmonic acid-mediated defence pathways, but suppresses the defence pathway regulated by ethylene. Chitin induced SA- and JA-regulated defence pathways may be one of the mechanisms involved in generating broad-spectrum resistance among the GmDR1-overexpressed transgenic soybean lines against two serious pathogens and two pests including spider mites, against which no known resistance genes have been identified in soybean and among the most other crop species.
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Affiliation(s)
| | | | - Bing Wang
- Department of AgronomyIowa State UniversityAmesIAUSA
- Present address:
Department of EnergyJoint Genome InstituteWalnut CreekCAUSA
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Ali M, Tumbeh Lamin-Samu A, Muhammad I, Farghal M, Khattak AM, Jan I, ul Haq S, Khan A, Gong ZH, Lu G. Melatonin Mitigates the Infection of Colletotrichum gloeosporioides via Modulation of the Chitinase Gene and Antioxidant Activity in Capsicum annuum L. Antioxidants (Basel) 2020; 10:antiox10010007. [PMID: 33374725 PMCID: PMC7822495 DOI: 10.3390/antiox10010007] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Revised: 12/18/2020] [Accepted: 12/21/2020] [Indexed: 12/21/2022] Open
Abstract
Anthracnose, caused by Colletotrichum gloeosporioides, is one of the most damaging pepper (Capsicum annum L.) disease. Melatonin induces transcription of defense-related genes that enhance resistance to pathogens and mediate physiological activities in plants. To study whether the melatonin-mediated pathogen resistance is associated with chitinase gene (CaChiIII2), pepper plants and Arabidopsis seeds were treated with melatonin, then CaChiIII2 activation, hydrogen peroxide (H2O2) levels, and antioxidant enzymes activity during plant–pathogen interactions were investigated. Melatonin pretreatment uncoupled the knockdown of CaChiIII2 and transiently activated its expression level in both control and CaChiIII2-silenced pepper plants and enhanced plant resistance. Suppression of CaChiIII2 in pepper plants showed a significant decreased in the induction of defense-related genes and resistance to pathogens compared with control plants. Moreover, melatonin efficiently enabled plants to maintain intracellular H2O2 concentrations at steady-state levels and enhanced the activities of antioxidant enzymes, which possibly improved disease resistance. The activation of the chitinase gene CaChiIII2 in transgenic Arabidopsis lines was elevated under C. gloeosporioides infection and exhibited resistance through decreasing H2O2 biosynthesis and maintaining H2O2 at a steady-state level. Whereas melatonin primed CaChiIII2-overexpressed (OE) and wild-type (WT) Arabidopsis seedlings displayed a remarkable increase in root-length compared to the unprimed WT plants. Using an array of CaChiIII2 knockdown and OE, we found that melatonin efficiently induced CaChiIII2 and other pathogenesis-related genes expressions, responsible for the innate immunity response of pepper against anthracnose disease.
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Affiliation(s)
- Muhammad Ali
- Department of Horticulture, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China; (M.A.); (A.T.L.-S.); (M.F.)
- College of Horticulture, Northwest A&F University, Yangling 712100, China
| | - Anthony Tumbeh Lamin-Samu
- Department of Horticulture, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China; (M.A.); (A.T.L.-S.); (M.F.)
| | - Izhar Muhammad
- College of Agronomy, Northwest A&F University, Yangling 712100, China;
| | - Mohamed Farghal
- Department of Horticulture, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China; (M.A.); (A.T.L.-S.); (M.F.)
| | - Abdul Mateen Khattak
- Department of Horticulture, The University of Agriculture, Peshawar 25120, Pakistan; (A.M.K.); (S.u.H.)
| | - Ibadullah Jan
- Department of Agriculture, University of Swabi, Khyber Pakhtunkhwa 9291, Pakistan;
| | - Saeed ul Haq
- Department of Horticulture, The University of Agriculture, Peshawar 25120, Pakistan; (A.M.K.); (S.u.H.)
| | - Abid Khan
- Department of Horticulture, The University of Haripur, Haripur 22620, Pakistan;
| | - Zhen-Hui Gong
- College of Horticulture, Northwest A&F University, Yangling 712100, China
- Correspondence: (Z.-H.G.); (G.L.)
| | - Gang Lu
- Department of Horticulture, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China; (M.A.); (A.T.L.-S.); (M.F.)
- Correspondence: (Z.-H.G.); (G.L.)
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Chitin- and Chitosan-Based Derivatives in Plant Protection against Biotic and Abiotic Stresses and in Recovery of Contaminated Soil and Water. POLYSACCHARIDES 2020. [DOI: 10.3390/polysaccharides1010003] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Biotic, abiotic stresses and their unpredictable combinations severely reduce plant growth and crop yield worldwide. The different chemicals (pesticides, fertilizers, phytoregulators) so far used to enhance crop tolerance to multistress have a great environmental impact. In the search of more eco-friendly systems to manage plant stresses, chitin, a polysaccharide polymer composed of N-acetyl-D-glucosamine and D-glucosamine and its deacetylated derivative chitosan appear as promising tools to solve this problem. In fact, these molecules, easily obtainable from crustacean shells and from the cell wall of many fungi, are non-toxic, biodegradable, biocompatible and able to stimulate plant productivity and to protect crops against pathogens. In addition, chitin and chitosan can act as bioadsorbents for remediation of contaminated soil and water. In this review we summarize recent results obtained using chitin- and chitosan-based derivatives in plant protection against biotic and abiotic stresses and in recovery of contaminated soil and water.
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Lu X, Wang B, Cai X, Chen S, Chen Z, Xin Z. Feeding on tea GH19 chitinase enhances tea defense responses induced by regurgitant derived from Ectropis grisescens. PHYSIOLOGIA PLANTARUM 2020; 169:529-543. [PMID: 32196677 DOI: 10.1111/ppl.13094] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2019] [Revised: 01/15/2020] [Accepted: 02/02/2020] [Indexed: 06/10/2023]
Abstract
Multiple isoforms of chitinases participate in plant defense against outside invaders. However, the functions of hydrolase family 19 (GH19) chitinases on pest control remain largely unknown. Here we reported the isolation and functional analysis of a gene CsChi19, which encodes a GH19 endochitinase protein of 332 amino acid residues from tea plant (Camellia sinensis). CsChi19 expression levels were upregulated in response to mechanical wounding, infestation by two important pests: the tea geometrid Ectropis grisescens and the tea green leafhopper Empoasca (Matsumurasca) onukii, a fungal pathogen Colletotrichum fructicola, and treatment with two phytohormones: jasmonic acid (JA) and salicylic acid. CsChi19 was heterologously expressed in Escherichia coli, and its catalytic function was further elucidated. The protein could hydrolyze colloidal chitin, and the optimum temperature and pH for its activity was 40°C and pH 5.0. CsChi19 were found to be toxic to tea pests when they were fed on artificial diets containing this protein. Interestingly, the regurgitant derived from E. grisescens fed with artificial diets containing CsChi19 protein induced stronger expression of CsMPK3, more JA burst, more accumulation of defense-related secondary metabolites, and more emission of volatiles than the regurgitant derived from E. grisescens fed only with artificial diets. Our results provide first evidence that CsChi19 is involved in mediating a novel defense mechanism of tea plant through altering the composition of the regurgitant.
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Affiliation(s)
- Xiaotong Lu
- Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou, 310008, China
- Key Laboratory of Tea Biology and Resource Utilization of Ministry of Agriculture, Hangzhou, 310008, China
| | - Baohui Wang
- Zhejiang Hospital of Traditional Chinese Medicine, Zhejiang Chinese Medical University, Hangzhou, 310006, China
| | - Xiaoming Cai
- Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou, 310008, China
- Key Laboratory of Tea Biology and Resource Utilization of Ministry of Agriculture, Hangzhou, 310008, China
| | - Shenglong Chen
- Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou, 310008, China
- Key Laboratory of Tea Biology and Resource Utilization of Ministry of Agriculture, Hangzhou, 310008, China
| | - Zongmao Chen
- Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou, 310008, China
- Key Laboratory of Tea Biology and Resource Utilization of Ministry of Agriculture, Hangzhou, 310008, China
| | - Zhaojun Xin
- Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou, 310008, China
- Key Laboratory of Tea Biology and Resource Utilization of Ministry of Agriculture, Hangzhou, 310008, China
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Liu J, Zhang C, Jia X, Wang W, Yin H. Comparative analysis of RNA-binding proteomes under Arabidopsis thaliana-Pst DC3000-PAMP interaction by orthogonal organic phase separation. Int J Biol Macromol 2020; 160:47-54. [PMID: 32454107 DOI: 10.1016/j.ijbiomac.2020.05.164] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2020] [Revised: 05/05/2020] [Accepted: 05/05/2020] [Indexed: 12/22/2022]
Abstract
RNA-binding proteins (RBPs) are pivotal participants in post-transcriptional gene regulation. They interact with RNA directly to perform several post-transcriptional RNA regulatory functions or direct metabolic processes. Despite the essential importance, the understanding of plant RBPs is elementary, which derives mainly from other kingdoms via bioinformatic extrapolation or mRNA-binding proteins captured through UV crosslinked method. Recently, orthogonal organic phase separation (OOPS) method for RBP identification has been used in mammals and Escherichia coli. And plentiful RBPs were enriched without molecular tagging or capture of polyadenylated RNA in an unbiased way. In our study, OOPS was conducted on Arabidopsis and 468 RBPs were discovered including 244 putative RBPs. There were 17 peroxidases in 232 RBPs with enzymatic activities. In addition, Arabidopsis thaliana-Pst DC3000-chitinpentaose interaction system was chosen to explore whether OOPS can be used to dig specific RBPs under special physiological conditions. Eighty-four differential RBPs in this system were found and some of them involved in reactive oxygen species (ROS) metabolic pathway. These results showed OOPS can be applied to plants successfully and would be a useful method to identify RBPomes and specific RBPs.
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Affiliation(s)
- Junjie Liu
- Dalian Engineering Research Center for Carbohydrate Agricultural Preparations, Liaoning Provincial Key Laboratory of Carbohydrates, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Chunguang Zhang
- Dalian Engineering Research Center for Carbohydrate Agricultural Preparations, Liaoning Provincial Key Laboratory of Carbohydrates, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China; School of Biological Engineering, Dalian Polytechnic University, Dalian 116034, China
| | - Xiaochen Jia
- Dalian Engineering Research Center for Carbohydrate Agricultural Preparations, Liaoning Provincial Key Laboratory of Carbohydrates, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Wenxia Wang
- Dalian Engineering Research Center for Carbohydrate Agricultural Preparations, Liaoning Provincial Key Laboratory of Carbohydrates, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Heng Yin
- Dalian Engineering Research Center for Carbohydrate Agricultural Preparations, Liaoning Provincial Key Laboratory of Carbohydrates, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China; University of Chinese Academy of Sciences, Beijing 100049, China.
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