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Sun J, Yang R, Liu Y, Zhou Z, Jia J, Huang H, Xiao S, Xue C. An efficient targeted gene deletion approach for Cochliobolus heterostrophus using Agrobacterium tumefaciens-mediated transformation. J Microbiol Methods 2024; 216:106863. [PMID: 38036223 DOI: 10.1016/j.mimet.2023.106863] [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: 09/01/2023] [Revised: 11/22/2023] [Accepted: 11/23/2023] [Indexed: 12/02/2023]
Abstract
Cochliobolus heterostrophus is a plant pathogenic fungus of southern corn leaf blight, which has been regarded as a model necrotrophic plant pathogen. Many methods have been developed to knock out targeted genes in C. heterostrophus, of which the most widely-used one is protoplast-mediated transformation. However, there are several problems of this method associated with protoplast preparation, DNA product, time consumption, or high cost. In this study, a highly efficient target gene deletion approach in C. heterostrophus was established and optimized, based on Agrobacterium tumefaciens-mediated transformation (ATMT); the transformation efficiency of this approach was 85-88 transformants per 105 conidia, and the homologous recombination efficiency was approximately 68.3%. Furthermore, six gene knockout mutants of C. heterostrophus were obtained using this ATMT method. The phenotypes of this fungus altered in the mutant strains, and the virulence of the mutants significantly reduced compared to of the wild type strain. Taken together, this ATMT system established in this study can be used as a genetic manipulation tool for C. heterostrophus, to better understand the functions of genes and its relation to virulence.
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Affiliation(s)
- Jiaying Sun
- College of Plant Protection, Shenyang Agricultural University, Shenyang 110866, Liaoning, PR China
| | - Rui Yang
- College of Plant Protection, Shenyang Agricultural University, Shenyang 110866, Liaoning, PR China
| | - Yujia Liu
- College of Plant Protection, Shenyang Agricultural University, Shenyang 110866, Liaoning, PR China
| | - Zengran Zhou
- College of Plant Protection, Shenyang Agricultural University, Shenyang 110866, Liaoning, PR China
| | - Jiaqi Jia
- College of Plant Protection, Shenyang Agricultural University, Shenyang 110866, Liaoning, PR China
| | - Hongming Huang
- College of Plant Protection, Shenyang Agricultural University, Shenyang 110866, Liaoning, PR China
| | - Shuqin Xiao
- College of Plant Protection, Shenyang Agricultural University, Shenyang 110866, Liaoning, PR China.
| | - Chunsheng Xue
- College of Plant Protection, Shenyang Agricultural University, Shenyang 110866, Liaoning, PR China.
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Yoon J, Kim Y, Kim S, Jeong H, Park J, Jeong MH, Park S, Jo M, An S, Park J, Jang SH, Goh J, Park SY. Agrobacterium tumefaciens-Mediated Transformation of the Aquatic Fungus Phialemonium inflatum FBCC-F1546. J Fungi (Basel) 2023; 9:1158. [PMID: 38132759 PMCID: PMC10744869 DOI: 10.3390/jof9121158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Revised: 11/23/2023] [Accepted: 11/29/2023] [Indexed: 12/23/2023] Open
Abstract
Phialemonium inflatum is a useful fungus known for its ability to mineralise lignin during primary metabolism and decompose polycyclic aromatic hydrocarbons (PAHs). However, no functional genetic analysis techniques have been developed yet for this fungus, specifically in terms of transformation. In this study, we applied an Agrobacterium tumefaciens-mediated transformation (ATMT) system to P. inflatum for a functional gene analysis. We generated 3689 transformants using the binary vector pSK1044, which carried either the hygromycin B phosphotransferase (hph) gene or the enhanced green fluorescent protein (eGFP) gene to label the transformants. A Southern blot analysis showed that the probability of a single copy of T-DNA insertion was approximately 50% when the co-cultivation of fungal spores and Agrobacterium tumefaciens cells was performed at 24-36 h, whereas at 48 h, it was approximately 35.5%. Therefore, when performing gene knockout using the ATMT system, the co-cultivation time was reduced to ≤36 h. The resulting transformants were mitotically stable, and a PCR analysis confirmed the genes' integration into the transformant genome. Additionally, hph and eGFP gene expressions were confirmed via PCR amplification and fluorescence microscopy. This optimised transformation system will enable functional gene analyses to study genes of interest in P. inflatum.
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Affiliation(s)
- Jonghan Yoon
- Department of Plant Medicine, Sunchon National University, Suncheon 57922, Republic of Korea; (J.Y.); (Y.K.); (S.K.); (H.J.); (J.P.); (M.-H.J.); (M.J.); (S.A.); (J.P.); (S.-H.J.)
| | - Youngjun Kim
- Department of Plant Medicine, Sunchon National University, Suncheon 57922, Republic of Korea; (J.Y.); (Y.K.); (S.K.); (H.J.); (J.P.); (M.-H.J.); (M.J.); (S.A.); (J.P.); (S.-H.J.)
| | - Seoyeon Kim
- Department of Plant Medicine, Sunchon National University, Suncheon 57922, Republic of Korea; (J.Y.); (Y.K.); (S.K.); (H.J.); (J.P.); (M.-H.J.); (M.J.); (S.A.); (J.P.); (S.-H.J.)
- Interdisciplinary Program in IT-Bio Convergence System (BK21 Plus), Sunchon National University, Suncheon 57922, Republic of Korea
| | - Haejun Jeong
- Department of Plant Medicine, Sunchon National University, Suncheon 57922, Republic of Korea; (J.Y.); (Y.K.); (S.K.); (H.J.); (J.P.); (M.-H.J.); (M.J.); (S.A.); (J.P.); (S.-H.J.)
| | - Jiyoon Park
- Department of Plant Medicine, Sunchon National University, Suncheon 57922, Republic of Korea; (J.Y.); (Y.K.); (S.K.); (H.J.); (J.P.); (M.-H.J.); (M.J.); (S.A.); (J.P.); (S.-H.J.)
- Interdisciplinary Program in IT-Bio Convergence System (BK21 Plus), Sunchon National University, Suncheon 57922, Republic of Korea
| | - Min-Hye Jeong
- Department of Plant Medicine, Sunchon National University, Suncheon 57922, Republic of Korea; (J.Y.); (Y.K.); (S.K.); (H.J.); (J.P.); (M.-H.J.); (M.J.); (S.A.); (J.P.); (S.-H.J.)
| | - Sangkyu Park
- Fungi Research Team, Microbial Research Department, Nakdonggang National Institute of Biological Resources, Donam 2-gil 137, Sangju 37242, Republic of Korea;
| | - Miju Jo
- Department of Plant Medicine, Sunchon National University, Suncheon 57922, Republic of Korea; (J.Y.); (Y.K.); (S.K.); (H.J.); (J.P.); (M.-H.J.); (M.J.); (S.A.); (J.P.); (S.-H.J.)
- Interdisciplinary Program in IT-Bio Convergence System (BK21 Plus), Sunchon National University, Suncheon 57922, Republic of Korea
| | - Sunmin An
- Department of Plant Medicine, Sunchon National University, Suncheon 57922, Republic of Korea; (J.Y.); (Y.K.); (S.K.); (H.J.); (J.P.); (M.-H.J.); (M.J.); (S.A.); (J.P.); (S.-H.J.)
- Interdisciplinary Program in IT-Bio Convergence System (BK21 Plus), Sunchon National University, Suncheon 57922, Republic of Korea
| | - Jiwon Park
- Department of Plant Medicine, Sunchon National University, Suncheon 57922, Republic of Korea; (J.Y.); (Y.K.); (S.K.); (H.J.); (J.P.); (M.-H.J.); (M.J.); (S.A.); (J.P.); (S.-H.J.)
- Interdisciplinary Program in IT-Bio Convergence System (BK21 Plus), Sunchon National University, Suncheon 57922, Republic of Korea
| | - Seol-Hwa Jang
- Department of Plant Medicine, Sunchon National University, Suncheon 57922, Republic of Korea; (J.Y.); (Y.K.); (S.K.); (H.J.); (J.P.); (M.-H.J.); (M.J.); (S.A.); (J.P.); (S.-H.J.)
| | - Jaeduk Goh
- Fungi Research Team, Microbial Research Department, Nakdonggang National Institute of Biological Resources, Donam 2-gil 137, Sangju 37242, Republic of Korea;
| | - Sook-Young Park
- Department of Plant Medicine, Sunchon National University, Suncheon 57922, Republic of Korea; (J.Y.); (Y.K.); (S.K.); (H.J.); (J.P.); (M.-H.J.); (M.J.); (S.A.); (J.P.); (S.-H.J.)
- Interdisciplinary Program in IT-Bio Convergence System (BK21 Plus), Sunchon National University, Suncheon 57922, Republic of Korea
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Gan T, An H, Tang M, Chen H. Establishment of RNA Interference Genetic Transformation System and Functional Analysis of FlbA Gene in Leptographium qinlingensis. Int J Mol Sci 2023; 24:13009. [PMID: 37629189 PMCID: PMC10455979 DOI: 10.3390/ijms241613009] [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: 07/15/2023] [Revised: 08/17/2023] [Accepted: 08/19/2023] [Indexed: 08/27/2023] Open
Abstract
Leptographium qinlingensis is a pathogenic fungus of Pinus armandii that is epidemic in the Qinling Mountains. However, an effective gene interference strategy is needed to characterize the pathogenic genes in this fungus on a functional level. Using the RNA silencing vector pSilent-1 as a template, we established an RNA interference genetic transformation system mediated by Agrobacterium tumefaciens GV3101, which is suitable for the gene study for Leptographium qinlingensis by homologous recombination and strain interference system screening. The LqFlbA gene was silenced using the RNA interference approach described above, and the resulting transformants displayed various levels of silencing with a gene silencing effectiveness ranging from 41.8% to 91.4%. The LqFlbA-RNAi mutant displayed altered colony morphology, sluggish mycelium growth, and diminished pathogenicity toward the host P. armandii in comparison to the wild type. The results indicate that this method provides a useful reverse genetic system for studying the gene function of L. qinlingensis, and that LqFlbA plays a crucial role in the growth, development, and pathogenicity of L. qinlingensis.
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Affiliation(s)
| | | | | | - Hui Chen
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou 510642, China (H.A.); (M.T.)
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