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The　Changes　on　Activity　of　Some　Protective　Enzymes　in　Maize　Seedlings　under　ht－toxin　Stress

河北农业大学学报 1995年第4期 6-11页

作者： Han Jianmin Dang Jingao Zhu Jiehua Li Wenfeng Li Guangmin(The first and fifth author: Dept of Agronomy, Hebei Agric. Univ., Baoding 071001 )(The second. third and forth author: Dept. of Pl. Protec., Hebei Agric. Univ., Baoding 071001 )

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ＴｈｅＣｈａｎｇｅｓｏｎＡｃｔｉｖｉｔｙｏｆＳｏｍｅＰｒｏｔｅｃｔｉｖｅＥｎｚｙｍｅｓｉｎＭａｉｚｅＳｅｅｄｌｉｎｇｓｕｎｄｅｒＨｔ－ｔｏｘｉｎＳｔｒｅｓｓＨａｎＪｉａｎｍｉｎ；ＤａｎｇＪｉｎｇａｏ；ＺｈｕＪｉｅｈｕａ；ＬｉＷｅｎｆｅｎｇ；ＬｉＧｕａ...

关键词： Helminthosporium (= Exserohilum) turcicum ht-toxin SOD POD MDA

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MAP kinase gene STK1 is required for hyphal, conidial, and appressorial development, toxin biosynthesis, pathogenicity, and hypertonic stress response in the plant pathogenic fungus Setosphaeria turcica

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Journal of Integrative Agriculture 2016年第12期15卷 2786-2794页

作者： LI Po GONG Xiao-dong JIA Hui FAN Yong-shan ZHANG Yun-feng CAO Zhi-yan HAO Zhi-min HAN Jian-min GU Shou-qin DONG Jin-gao Mycotoxin and Molecular Plant Pathology Laboratory Agricultural University of Hebei Baoding 071000 P.R. China Institute of Plant Protection Hebei Academy of Agriculture and Forestry Sciences Baoding 071000 P.R. China Tangshan Normal University Tangshan 063000 P.R. China

The mitogen-activated protein kinase （MAPK）, a key signal transduction component in the MAPK cascade pathway, regulates a variety of physiological activities in eukaryotes. However, little is known of the role MAPK plays in phytopathogenic fungi. In this research, we cloned the MAPK gene STK1 from the northern corn leaf blight pathogen Setosphaeria turcica and found that the gene shared high homology with the high osmolality glycerol （HOG） MAPK gene HOG1 of Saccharomy- ces cerevisiae. In addition, gene knockout technology was employed to investigate the function of STKI. Gene knockout mutants （KOs） were found to have altered hyphae morphology and no conidiogenesis, though they did show similar radial growth rate compared to the wild-type strain （WT）. Furthermore, microscope observations indicated that STK1 KOs did not form normal appressoria at 48 h post-inoculation on a hydrophobic surface. STK1 KOs had reduced virulence, a significantly altered Helminthosporium turcicum （ht）-toxin composition, and diminished pathogenicity on the leaves of susceptible inbred corn OH43. Mycelium morphology appeared to be significantly swollen and the radial growth rates of STK1 KOs declined in comparison with WT under high osmotic stress. These results suggested that STK1 affects the hyphae development, conidiogenesis, and pathogenicity of S. turcica by regulating appressorium development and ht-toxin biosynthesis. Moreover, the gene appears to be involved in the hypertonic stress response in S. turcica.

关键词： Setosphaeria turcica MAPK conidiogenesis ht-toxin pathogenicity

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