| 黄瓜腐霉菌苗期猝倒病致病机制研究 |
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| 引用本文： | 陈捷,高洪敏.黄瓜腐霉菌苗期猝倒病致病机制研究[J].植物病理学报,1996,26(1):55-61. |
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| 作者姓名： | 陈捷 高洪敏 |
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| 作者单位： | 沈阳农业大学植保系, 沈阳 110161 |
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| 摘 要： | 本文明确了Pythium aphanidermatum主要靠生产以PG(多聚半乳糖醛酸酶)为主的一系列细胞壁降解酶的协调作用侵染黄瓜幼苗。植株胚轴细胞壁随苗龄增加,果胶物质增加最明显。病菌可在健胚轴及其细胞壁上培养产生果胶酶,其中细胞壁对PG的诱导作用比胚轴明显。随病菌致病力增强或病菌果胶酶浓度加大,胚轴的浸解和释放还原糖愈加明显。健株外渗物中虽也含有细胞壁降解酶,但比病菌的产生量少,活性低。病菌在寄生体内产生的细胞壁降解酶总酶活性,尤其是PG总酶活性与病菌致病力关系最为密切。这类细胞壁降解酶易受培养基成分和酸度的影响。经染色、显微及超微观察证实了该菌侵入黄瓜苗的机制是以酶解作用为主。
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| 关 键 词： | 黄瓜 苗期猝倒病 致病机制 瓜果腐霉 |
ON PATHOGENETIC MECHAN ISM OF CUCUMBER SEEDLING DAMPING-OFF CAUSED BYPYTHIUM APHANIDERMATUM |
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| Chen Jie,Gao Hongmin,Zhu Yougang,Wu Yousan.ON PATHOGENETIC MECHAN ISM OF CUCUMBER SEEDLING DAMPING-OFF CAUSED BYPYTHIUM APHANIDERMATUM[J].Acta Phytopathologica Sinica,1996,26(1):55-61. |
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| Authors: | Chen Jie Gao Hongmin Zhu Yougang Wu Yousan |
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| Institution: | Shenyang Agricultural University, Shengyang 110161 |
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| Abstract: | This study indicated that Pythium aphanidermatum, a causal organism of cucumber seedling damping-off, infected cucumber seedling by a synergistic action of polygalacturonase (PG) with other Cell Wall-degrading Enzymes (CW DEs). Pectic substance content in seedling hypocotyl increased most remarkably with growth of seedling age. |
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| Keywords: | Cucumber Damping off Pathogenetic mechanism Pythium aphanidermatum |
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