尖镰孢古巴专化型4号小种T-DNA插入突变体Focr4-1562及其基因敲除子的生物学表型研究 |
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引用本文: | 吴飞宏,曾涛,陈汉清,曾会才,彭明.尖镰孢古巴专化型4号小种T-DNA插入突变体Focr4-1562及其基因敲除子的生物学表型研究[J].菌物学报,2012,31(4):584-592. |
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作者姓名: | 吴飞宏 曾涛 陈汉清 曾会才 彭明 |
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作者单位: | 1. 海南大学环境与植物保护学院 海南 海口 570228 2. 中国热带农业科学院热带生物技术研究所 海南 海口 571101;中国热带农业科学院 海口实验站/香蕉研究所 海南 海口 571101 3. 中国热带农业科学院热带生物技术研究所 海南 海口 571101 |
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基金项目: | 国家自然科学基金(No. 30860160);国家公益性行业(农业)科研专项课题(No. 200903049-2);海南大学“211工程”建设项目;海南大学环境与植物保护学院研究生创新平台 |
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摘 要: | 尖镰孢古巴专化型4号小种Fusarium oxysporum f. sp. cubense race 4(Focr4)是引起毁灭性土传病害香蕉枯萎病的危害性最大的小种,至今其致病机理尚不清楚。对已获得的野生型菌株Focr4-193-6经基因T-DNA插入引起致病性严重减弱的突变体Focr4-1562及其插入失活基因的敲除子△Focr4-1562的生物学表型进行了研究。玻璃纸穿透试验、活体叶片接种及根部接种致病性测定的结果表明,插入突变体和敲除子不能穿透玻璃纸生长,叶片接种和根部接种未见有明显病斑和球茎维管
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关 键 词: | 香蕉枯萎病 T-DNA插入突变体 基因敲除 生物学特性 |
Phenotype analysis of the T-DNA insertion mutant Focr4-1562 of Fusarium oxysporum f. sp. cubense race 4 and its gene-knockout mutant |
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Authors: | WU Fei-Hong ZENG Tao CHEN Han-Qing ZENG Hui-Cai and PENG Ming |
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Institution: | College of Environment and Plant Protection, Hainan University, Haikou, Hainan 570228, China;Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou, Hainan 571101, China
Experimental Station of Haikou/Institute of Banana and Plantain, Chinese Academy of Tropical Agricultural Sciences, Haikou,;Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou, Hainan 571101, China;Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou, Hainan 571101, China
Experimental Station of Haikou/Institute of Banana and Plantain, Chinese Academy of Tropical Agricultural Sciences, Haikou,;Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou, Hainan 571101, China |
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Abstract: | Fusarium oxysporum f.sp.cubense race 4(Focr4) is considered as one of the most destructive pathogens of the world distributed soil-borne banana.Its pathogenesis has not been clearly understood.The pathogenicity of mutant Focr4-1562 was significantly weakened after T-DNA insertion in its gene sequence.The inserted exogenous gene caused changes in functions of some genes in the △Focr4-1562.By means of cellophane penetration test as well as pathogenic test by inoculating live leaves and roots,changes in pathogenic phenotype of the mutant Focr4-1562 and △Focr4-1562 were compared with the wild type Focr4.The mutant Focr4-1562 and △Focr4-1562 could not grow through cellophane,and didn’t cause any disease spots and brown coloration in corm vascular bundle.The results showed that the optimum growth temperature of the wild type Focr4,Focr4-1562 and △Focr4-1562 were all at 28℃,and their optimum growth pH was 7.0 to 8.0.No evident difference was found in their spore morphology,but the sporulation of △Focr4-1562 was obviously delayed,and its sporulation capacity was significantly decreased.The Focr4-1562 and △Focr4-1562 were more resistant to cell wall degrading enzyme than the wild type Focr4-193-6.It is concluded that the knockout of the pathogenic gene is responsible for conidial production and cell wall formation of the wild type Focr4-193-6. |
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Keywords: | Banana wilt disease T-DNA insertion mutant gene knockout biological characters |
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