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Wang X, Shen Z, Li C, Bai Y, Li Y, Zhang W, Li Z, Jiang C, Cheng L, Yang A, Liu D. Fine mapping and identification of two NtTOM2A homeologs responsible for tobacco mosaic virus replication in tobacco (Nicotiana tabacum L.). BMC PLANT BIOLOGY 2024; 24:67. [PMID: 38262958 PMCID: PMC10807211 DOI: 10.1186/s12870-024-04744-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Accepted: 01/11/2024] [Indexed: 01/25/2024]
Abstract
BACKGROUND Tobacco mosaic virus (TMV) is a widely distributed viral disease that threatens many vegetables and horticultural species. Using the resistance gene N which induces a hypersensitivity reaction, is a common strategy for controlling this disease in tobacco (Nicotiana tabacum L.). However, N gene-mediated resistance has its limitations, consequently, identifying resistance genes from resistant germplasms and developing resistant cultivars is an ideal strategy for controlling the damage caused by TMV. RESULTS Here, we identified highly TMV-resistant tobacco germplasm, JT88, with markedly reduced viral accumulation following TMV infection. We mapped and cloned two tobamovirus multiplication protein 2A (TOM2A) homeologs responsible for TMV replication using an F2 population derived from a cross between the TMV-susceptible cultivar K326 and the TMV-resistant cultivar JT88. Clustered regularly interspaced short palindromic repeats (CRISPR)/CRISPR-associated protein 9 (CRISPR/Cas9)-mediated loss-of-function mutations of two NtTOM2A homeologs almost completely suppressed TMV replication; however, the single gene mutants showed symptoms similar to those of the wild type. Moreover, NtTOM2A natural mutations were rarely detected in 577 tobacco germplasms, and CRISPR/Cas9-mediated variation of NtTOM2A led to shortened plant height, these results indicating that the natural variations in NtTOM2A were rarely applied in tobacco breeding and the NtTOM2A maybe has an impact on growth and development. CONCLUSIONS The two NtTOM2A homeologs are functionally redundant and negatively regulate TMV resistance. These results deepen our understanding of the molecular mechanisms underlying TMV resistance in tobacco and provide important information for the potential application of NtTOM2A in TMV resistance breeding.
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Affiliation(s)
- Xuebo Wang
- Key Laboratory for Tobacco Gene Resources, Tobacco Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Qingdao, 266101, China
- Tobacco Science Research Institute of Guangdong Province, Shaoguan, Guangdong, 512029, China
| | - Zhan Shen
- Key Laboratory for Tobacco Gene Resources, Tobacco Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Qingdao, 266101, China
| | - Caiyue Li
- Key Laboratory for Tobacco Gene Resources, Tobacco Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Qingdao, 266101, China
| | - Yalin Bai
- Key Laboratory for Tobacco Gene Resources, Tobacco Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Qingdao, 266101, China
| | - Yangyang Li
- Hunan Tobacco Research Institute, Changsha, 410004, China
| | - Wenhui Zhang
- Linyi University, Linyi, 276000, Shandong, China
- Philippine Christian University Center for International Education, Manila, 1004, Philippines
| | - Zunqiang Li
- Tobacco Research Institute of Mudanjiang, Harbin, 150076, China.
| | - Caihong Jiang
- Key Laboratory for Tobacco Gene Resources, Tobacco Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Qingdao, 266101, China
| | - Lirui Cheng
- Key Laboratory for Tobacco Gene Resources, Tobacco Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Qingdao, 266101, China
| | - Aiguo Yang
- Key Laboratory for Tobacco Gene Resources, Tobacco Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Qingdao, 266101, China.
| | - Dan Liu
- Key Laboratory for Tobacco Gene Resources, Tobacco Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Qingdao, 266101, China.
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Huang L, Gao G, Jiang C, Guo G, He Q, Zong Y, Liu C, Yang P. Generating homozygous mutant populations of barley microspores by ethyl methanesulfonate treatment. ABIOTECH 2023; 4:202-212. [PMID: 37970468 PMCID: PMC10638298 DOI: 10.1007/s42994-023-00108-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Accepted: 05/31/2023] [Indexed: 11/17/2023]
Abstract
Induced mutations are important for genetic research and breeding. Mutations induced by physical or chemical mutagenesis are usually heterozygous during the early generations. However, mutations must be fixed prior to phenotyping or field trials, which requires additional rounds of self-pollination. Microspore culture is an effective method to produce double-haploid (DH) plants that are fixed homozygotes. In this study, we conducted ethyl methanesulfonate (EMS)-induced mutagenesis of microspore cultures of barley (Hordeum vulgare) cultivar 'Hua30' and landrace 'HTX'. The EMS concentrations were negatively correlated with the efficiency of callus induction and the frequency of mutant plant regeneration. The two genotypes showed different regeneration efficiencies. The phenotypic variation of the regenerated M1 plants and the presence of genome-wide nucleotide mutations, revealed by whole-genome sequencing, highlight the utility of EMS-induced mutagenesis of isolated microspore cultures for developing DH mutants. Genome-wide analysis of the mutation frequency in the regenerated plants revealed that a considerable proportion of mutations resulted from microspore culture (somaclonal variation) rather than EMS-induced mutagenesis. In addition to producing a population of 1972 homozygous mutant lines that are available for future field trials, this study lays the foundation for optimizing the regeneration efficiency of DH plants and the richness of mutations (mainly by fine-tuning the mutagen dosage).
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Affiliation(s)
- Linli Huang
- Biotech Research Institute, Shanghai Academy of Agricultural Sciences/Shanghai Key Laboratory of Agricultural Genetics and Breeding, Shanghai, 201106 China
| | - Guangqi Gao
- Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100081 China
| | - Congcong Jiang
- Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100081 China
| | - Guimei Guo
- Biotech Research Institute, Shanghai Academy of Agricultural Sciences/Shanghai Key Laboratory of Agricultural Genetics and Breeding, Shanghai, 201106 China
| | - Qiang He
- Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100081 China
| | - Yingjie Zong
- Biotech Research Institute, Shanghai Academy of Agricultural Sciences/Shanghai Key Laboratory of Agricultural Genetics and Breeding, Shanghai, 201106 China
| | - Chenghong Liu
- Biotech Research Institute, Shanghai Academy of Agricultural Sciences/Shanghai Key Laboratory of Agricultural Genetics and Breeding, Shanghai, 201106 China
| | - Ping Yang
- Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100081 China
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Szurman-Zubrzycka M, Kurowska M, Till BJ, Szarejko I. Is it the end of TILLING era in plant science? FRONTIERS IN PLANT SCIENCE 2023; 14:1160695. [PMID: 37674734 PMCID: PMC10477672 DOI: 10.3389/fpls.2023.1160695] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Accepted: 07/19/2023] [Indexed: 09/08/2023]
Abstract
Since its introduction in 2000, the TILLING strategy has been widely used in plant research to create novel genetic diversity. TILLING is based on chemical or physical mutagenesis followed by the rapid identification of mutations within genes of interest. TILLING mutants may be used for functional analysis of genes and being nontransgenic, they may be directly used in pre-breeding programs. Nevertheless, classical mutagenesis is a random process, giving rise to mutations all over the genome. Therefore TILLING mutants carry background mutations, some of which may affect the phenotype and should be eliminated, which is often time-consuming. Recently, new strategies of targeted genome editing, including CRISPR/Cas9-based methods, have been developed and optimized for many plant species. These methods precisely target only genes of interest and produce very few off-targets. Thus, the question arises: is it the end of TILLING era in plant studies? In this review, we recap the basics of the TILLING strategy, summarize the current status of plant TILLING research and present recent TILLING achievements. Based on these reports, we conclude that TILLING still plays an important role in plant research as a valuable tool for generating genetic variation for genomics and breeding projects.
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Affiliation(s)
- Miriam Szurman-Zubrzycka
- Institute of Biology, Biotechnology and Environmental Protection, Faculty of Natural Sciences, University of Silesia in Katowice, Katowice, Poland
| | - Marzena Kurowska
- Institute of Biology, Biotechnology and Environmental Protection, Faculty of Natural Sciences, University of Silesia in Katowice, Katowice, Poland
| | - Bradley J. Till
- Veterinary Genetics Laboratory, University of California, Davis, Davis, United States
| | - Iwona Szarejko
- Institute of Biology, Biotechnology and Environmental Protection, Faculty of Natural Sciences, University of Silesia in Katowice, Katowice, Poland
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Jiang C, Lei M, Guo Y, Gao G, Shi L, Jin Y, Cai Y, Himmelbach A, Zhou S, He Q, Yao X, Kan J, Haberer G, Duan F, Li L, Liu J, Zhang J, Spannagl M, Liu C, Stein N, Feng Z, Mascher M, Yang P. A reference-guided TILLING by amplicon-sequencing platform supports forward and reverse genetics in barley. PLANT COMMUNICATIONS 2022; 3:100317. [PMID: 35605197 PMCID: PMC9284286 DOI: 10.1016/j.xplc.2022.100317] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2021] [Revised: 02/13/2022] [Accepted: 03/11/2022] [Indexed: 05/26/2023]
Abstract
Barley is a diploid species with a genome smaller than those of other members of the Triticeae tribe, making it an attractive model for genetic studies in Triticeae crops. The recent development of barley genomics has created a need for a high-throughput platform to identify genetically uniform mutants for gene function investigations. In this study, we report an ethyl methanesulfonate (EMS)-mutagenized population consisting of 8525 M3 lines in the barley landrace "Hatiexi" (HTX), which we complement with a high-quality de novo assembly of a reference genome for this genotype. The mutation rate within the population ranged from 1.51 to 4.09 mutations per megabase, depending on the treatment dosage of EMS and the mutation discrimination platform used for genotype analysis. We implemented a three-dimensional DNA pooling strategy combined with multiplexed amplicon sequencing to create a highly efficient and cost-effective TILLING (targeting induced locus lesion in genomes) platform in barley. Mutations were successfully identified from 72 mixed amplicons within a DNA pool containing 64 individual mutants and from 56 mixed amplicons within a pool containing 144 individuals. We discovered abundant allelic mutants for dozens of genes, including the barley Green Revolution contributor gene Brassinosteroid insensitive 1 (BRI1). As a proof of concept, we rapidly determined the causal gene responsible for a chlorotic mutant by following the MutMap strategy, demonstrating the value of this resource to support forward and reverse genetic studies in barley.
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Affiliation(s)
- Congcong Jiang
- Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Miaomiao Lei
- Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China; College of Agronomy, Sichuan Agricultural University, Chengdu, China
| | - Yu Guo
- Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Seeland, Germany
| | - Guangqi Gao
- Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Lijie Shi
- Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China; College of Agronomy, Sichuan Agricultural University, Chengdu, China
| | - Yanlong Jin
- Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Yu Cai
- Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China; College of Agronomy, Sichuan Agricultural University, Chengdu, China
| | - Axel Himmelbach
- Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Seeland, Germany
| | - Shenghui Zhou
- Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Qiang He
- Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Xuefeng Yao
- Institute of Botany, Chinese Academy of Sciences, Beijing, China
| | - Jinhong Kan
- Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Georg Haberer
- Plant Genome and Systems Biology (PGSB), Helmholtz Center Munich, German Research Center for Environmental Health, Neuherberg, Germany
| | - Fengying Duan
- Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Lihui Li
- Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Jun Liu
- Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Jing Zhang
- Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Manuel Spannagl
- Plant Genome and Systems Biology (PGSB), Helmholtz Center Munich, German Research Center for Environmental Health, Neuherberg, Germany
| | - Chunming Liu
- Institute of Botany, Chinese Academy of Sciences, Beijing, China
| | - Nils Stein
- Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Seeland, Germany
| | - Zongyun Feng
- College of Agronomy, Sichuan Agricultural University, Chengdu, China
| | - Martin Mascher
- Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Seeland, Germany.
| | - Ping Yang
- Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China.
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Zou C, Lu T, Wang R, Xu P, Jing Y, Wang R, Xu J, Wan J. Comparative physiological and metabolomic analyses reveal that Fe 3O 4 and ZnO nanoparticles alleviate Cd toxicity in tobacco. J Nanobiotechnology 2022; 20:302. [PMID: 35761340 PMCID: PMC9235244 DOI: 10.1186/s12951-022-01509-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2022] [Accepted: 06/14/2022] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND Heavy metals repress tobacco growth and quality, and engineered nanomaterials have been used for sustainable agriculture. However, the underlying mechanism of nanoparticle-mediated cadmium (Cd) toxicity in tobacco remains elusive. RESULTS Herein, we investigated the effects of Fe3O4 and ZnO nanoparticles (NPs) on Cd stress in tobacco cultivar 'Yunyan 87' (Nicotiana tabacum). Cd severely repressed tobacco growth, whereas foliar spraying with Fe3O4 and ZnO NPs promoted plant growth, as indicated by enhancing plant height, root length, shoot and root fresh weight under Cd toxicity. Moreover, Fe3O4 and ZnO NPs increased, including Zn, K and Mn contents, in the roots and/or leaves and facilitated seedling growth under Cd stress. Metabolomics analysis showed that 150 and 76 metabolites were differentially accumulated in roots and leaves under Cd stress, respectively. These metabolites were significantly enriched in the biosynthesis of amino acids, nicotinate and nicotinamide metabolism, arginine and proline metabolism, and flavone and flavonol biosynthesis. Interestingly, Fe3O4 and ZnO NPs restored 50% and 47% in the roots, while they restored 70% and 63% in the leaves to normal levels, thereby facilitating plant growth. Correlation analysis further indicated that these metabolites, including proline, 6-hydroxynicotinic acid, farrerol and quercetin-3-O-sophoroside, were significantly correlated with plant growth. CONCLUSIONS These results collectively indicate that metal nanoparticles can serve as plant growth regulators and provide insights into using them for improving crops in heavy metal-contaminated areas.
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Affiliation(s)
- Congming Zou
- Yunnan Academy of Tobacco Agricultural Sciences, Kunming, 650021, Yunnan, China
| | - Tianquan Lu
- CAS Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Mengla, 666303, Yunnan, China
- Center of Economic Botany, Chinese Academy of Sciences, Menglun, Mengla, 666303, Yunnan, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Ruting Wang
- College of Horticulture, Shanxi Agricultural University, Taigu, 030801, Shanxi, China
| | - Peng Xu
- CAS Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Mengla, 666303, Yunnan, China
- Center of Economic Botany, Chinese Academy of Sciences, Menglun, Mengla, 666303, Yunnan, China
| | - Yifen Jing
- CAS Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Mengla, 666303, Yunnan, China
- Center of Economic Botany, Chinese Academy of Sciences, Menglun, Mengla, 666303, Yunnan, China
| | - Ruling Wang
- CAS Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Mengla, 666303, Yunnan, China
- Center of Economic Botany, Chinese Academy of Sciences, Menglun, Mengla, 666303, Yunnan, China
| | - Jin Xu
- College of Horticulture, Shanxi Agricultural University, Taigu, 030801, Shanxi, China.
| | - Jinpeng Wan
- CAS Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Mengla, 666303, Yunnan, China.
- Center of Economic Botany, Chinese Academy of Sciences, Menglun, Mengla, 666303, Yunnan, China.
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Li DQ, Wu XB, Wang HF, Feng X, Yan SJ, Wu SY, Liu JX, Yao XF, Bai AN, Zhao H, Song XF, Guo L, Zhang SY, Liu CM. Defective mitochondrial function by mutation in THICK ALEURONE 1 encoding a mitochondrion-targeted single-stranded DNA-binding protein leads to increased aleurone cell layers and improved nutrition in rice. MOLECULAR PLANT 2021; 14:1343-1361. [PMID: 34015460 DOI: 10.1016/j.molp.2021.05.016] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Revised: 03/27/2021] [Accepted: 05/15/2021] [Indexed: 05/09/2023]
Abstract
Cereal endosperm comprises an outer aleurone and an inner starchy endosperm. Although these two tissues have the same developmental origin, they differ in morphology, cell fate, and storage product accumulation, with the mechanism largely unknown. Here, we report the identification and characterization of rice thick aleurone 1 (ta1) mutant that shows an increased number of aleurone cell layers and increased contents of nutritional factors including proteins, lipids, vitamins, dietary fibers, and micronutrients. We identified that the TA1 gene, which is expressed in embryo, aleurone, and subaleurone in caryopses, encodes a mitochondrion-targeted protein with single-stranded DNA-binding activity named OsmtSSB1. Cytological analyses revealed that the increased aleurone cell layers in ta1 originate from a developmental switch of subaleurone toward aleurone instead of starchy endosperm in the wild type. We found that TA1/OsmtSSB1 interacts with mitochondrial DNA recombinase RECA3 and DNA helicase TWINKLE, and downregulation of RECA3 or TWINKLE also leads to ta1-like phenotypes. We further showed that mutation in TA1/OsmtSSB1 causes elevated illegitimate recombinations in the mitochondrial genome, altered mitochondrial morphology, and compromised energy supply, suggesting that the OsmtSSB1-mediated mitochondrial function plays a critical role in subaleurone cell-fate determination in rice.
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Affiliation(s)
- Dong-Qi Li
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China; University of Chinese Academy of Sciences, Beijing 100864, China
| | - Xiao-Ba Wu
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China; University of Chinese Academy of Sciences, Beijing 100864, China
| | - Hai-Feng Wang
- Rice Research Institute, Shandong Academy of Agricultural Sciences, Jinan 250100, China
| | - Xue Feng
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
| | - Shi-Juan Yan
- Guangdong Key Laboratory for Crop Germplasm Resources Preservation and Utilization, Agro-biological Gene Research Center, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
| | - Sheng-Yang Wu
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China; University of Chinese Academy of Sciences, Beijing 100864, China
| | - Jin-Xin Liu
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China; University of Chinese Academy of Sciences, Beijing 100864, China
| | - Xue-Feng Yao
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China; University of Chinese Academy of Sciences, Beijing 100864, China
| | - Ai-Ning Bai
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China; University of Chinese Academy of Sciences, Beijing 100864, China
| | - Heng Zhao
- Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Xiu-Fen Song
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China; University of Chinese Academy of Sciences, Beijing 100864, China
| | - Lin Guo
- Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Shi-Yong Zhang
- Rice Research Institute, Shandong Academy of Agricultural Sciences, Jinan 250100, China
| | - Chun-Ming Liu
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China; University of Chinese Academy of Sciences, Beijing 100864, China; Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China; School of Advanced Agricultural Sciences, Peking University, Beijing 100871, China; Innovative Academy of Seed Design, Chinese Academy of Sciences, Beijing 100101, China.
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Yao XF, Wu S, Guo L, Liu CM. Efficient CELI endonuclease production in Nicotiana benthamiana through transient expression and applications in detections of mutation and gene editing events. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2020; 296:110469. [PMID: 32539999 DOI: 10.1016/j.plantsci.2020.110469] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2019] [Revised: 03/12/2020] [Accepted: 03/14/2020] [Indexed: 06/11/2023]
Abstract
Rapid and low-cost methods of detecting mutations and polymorphisms are crucial for genotyping applications including mutagenesis and gene editing. S1 family endonucleases such as T7E1, EndoV and CELI can potentially be used in enzymatic mismatch detection. Among them, CELI has been shown to be effective in detecting mutations in Targeting Induced Local Lesions IN Genomes (TILLING). However, current method of CELI purification from celery is laborious, and challenging for many non-biochemical laboratories, and the presence of post-translational modifications hinders efficient production of the enzyme in E. coli. Here, we report an efficient system for bulk production of enzymatically active CELI endonuclease through transient expression in a model plant Nicotiana benthamiana. We also optimized the reaction buffer, by additions of Mn2+ and DTT, with enhanced mismatch cleavage activity. Using the new CELI production and reaction system, we were able to routinely detect mismatches in 1/32 mixed mutant and wildtype DNA samples. We believe the newly established system has many applications in characterization of mutations occurred in natural variations, mutagenized populations and gene editing.
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Affiliation(s)
- Xue-Feng Yao
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shengyang Wu
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China
| | - Lei Guo
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Chun-Ming Liu
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China; Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100081, China.
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8
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Song Z, Sui X, Li M, Gao Y, Li W, Zhao L, Li F, Yao X, Liu C, Wang B. Development of a nornicotine-reduced flue-cured tobacco line via EMS mutagenesis of nicotine N-demethylase genes. PLANT SIGNALING & BEHAVIOR 2020; 15:1710053. [PMID: 31900036 PMCID: PMC7053972 DOI: 10.1080/15592324.2019.1710053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2019] [Revised: 12/23/2019] [Accepted: 12/24/2019] [Indexed: 06/10/2023]
Abstract
Substantial progress had been made in reducing nornicotine accumulation in burley tobacco, as nornicotine is a precursor of the carcinogen N-nitrosonornicotine (NNN). Three members of the CYP82E2 family encoding nicotine N-demethylase (NND) have been reported to be responsible for the majority of nicotine demethylation that forms nornicotine in burley tobacco. We had obtained a nonsense mutant of each NND member in flue-cured tobacco from an ethyl methanesulfonate (EMS)-mutagenized population. In this study, we developed dCAPS markers for each nonsense mutation. Using marker-assisted selection, NND mutants were crossed with each other to generate a triple mutant GP449. In line with previous reports, the triple knockout caused significantly decreased levels of nornicotine and NNN in flue-cured tobacco. With the decreased nornicotine, the nicotine level was expected to accumulate. However, the nicotine level in GP449 was significantly decreased to 72.80% of wild type. Realtime RT-PCR analysis showed that the nicotine reduction was correlated with inhibited expression of nicotine biosynthetic pathway genes. The triple mutant and dCAPS markers can be utilized to develop new flue-cured tobacco varieties with lower levels of nornicotine and NNN.
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Affiliation(s)
- Zhongbang Song
- Yunnan Academy of Tobacco Agricultural Sciences, Kunming, Yunnan, China
- National Center for Tobacco Gene Engineering, Kunming, Yunnan, China
| | - Xueyi Sui
- Yunnan Academy of Tobacco Agricultural Sciences, Kunming, Yunnan, China
- National Center for Tobacco Gene Engineering, Kunming, Yunnan, China
| | - Meiyun Li
- Yunnan Academy of Tobacco Agricultural Sciences, Kunming, Yunnan, China
- National Center for Tobacco Gene Engineering, Kunming, Yunnan, China
| | - Yulong Gao
- Yunnan Academy of Tobacco Agricultural Sciences, Kunming, Yunnan, China
- National Center for Tobacco Gene Engineering, Kunming, Yunnan, China
| | - Wenzheng Li
- Yunnan Academy of Tobacco Agricultural Sciences, Kunming, Yunnan, China
- National Center for Tobacco Gene Engineering, Kunming, Yunnan, China
| | - Lu Zhao
- Yunnan Academy of Tobacco Agricultural Sciences, Kunming, Yunnan, China
- National Center for Tobacco Gene Engineering, Kunming, Yunnan, China
| | - Feng Li
- China Tobacco Gene Research Center, Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou, China
| | - Xuefeng Yao
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, the Chinese Academy of Sciences, Beijing, China
- The University of Chinese Academy of Sciences, Beijing, China
| | - Chunming Liu
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, the Chinese Academy of Sciences, Beijing, China
- Institute of crop sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Bingwu Wang
- Yunnan Academy of Tobacco Agricultural Sciences, Kunming, Yunnan, China
- National Center for Tobacco Gene Engineering, Kunming, Yunnan, China
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