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<p>The fungus <i>Magnaporthiopsis maydis</i> causes late wilt, a disease that severely affects maize fields in Egypt. The purpose of this study was to investigate the efficacy of the plant resistance elicitor salicylic acid (SA) against <i>M. maydis </i>in vitro, in pot, and field settings. There was a significant negative relationship between salicylic acid SA concentration and <i>M. maydis</i> growth, and at a concentration of 200&#xa0;ppm, mycelial growth and spore germination were completely inhibited. In pot trials, SA at 200&#xa0;ppm systemically induced resistance (chitinase, peroxidase, polyphenoloxidase, total phenols, and flavonoids) against <i>M. maydis</i> and significantly (<i>P</i> = 0.05) reduced the late wilt disease by 39.9–69.9% as compared to the positive control. When SA was treated as grain soaking + foliage spraying (GS + FS), the disease decrease was more evident. This treatment significantly reduced the incidence of late wilt by 69.9 and 71.8% under greenhouse and field conditions, respectively. A marked increase in plant height, plant fresh weight, plant dry weight, and chlorophyll contents was observed in SA-treated maize plants. Exogenously applied SA also reduced late wilt disease by 45.2–71.8% and increased ear yield by 27.5–46.9% in maize plants grown in field trials. Among SA applications, (GS + FS) showed the highest protection against maize late wilt.</p>

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Efficacy of plant resistance elicitor salicylic acid against Magnaporthiopsis maydis and its exogenous application for controlling late wilt disease of maize

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  • 发表日期：

    2025年3月3日

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  • Ibrahim E. Elshahawy,
  • Mohamed S. Abd El-Wahed

摘要

The fungus Magnaporthiopsis maydis causes late wilt, a disease that severely affects maize fields in Egypt. The purpose of this study was to investigate the efficacy of the plant resistance elicitor salicylic acid (SA) against M. maydis in vitro, in pot, and field settings. There was a significant negative relationship between salicylic acid SA concentration and M. maydis growth, and at a concentration of 200 ppm, mycelial growth and spore germination were completely inhibited. In pot trials, SA at 200 ppm systemically induced resistance (chitinase, peroxidase, polyphenoloxidase, total phenols, and flavonoids) against M. maydis and significantly (P = 0.05) reduced the late wilt disease by 39.9–69.9% as compared to the positive control. When SA was treated as grain soaking + foliage spraying (GS + FS), the disease decrease was more evident. This treatment significantly reduced the incidence of late wilt by 69.9 and 71.8% under greenhouse and field conditions, respectively. A marked increase in plant height, plant fresh weight, plant dry weight, and chlorophyll contents was observed in SA-treated maize plants. Exogenously applied SA also reduced late wilt disease by 45.2–71.8% and increased ear yield by 27.5–46.9% in maize plants grown in field trials. Among SA applications, (GS + FS) showed the highest protection against maize late wilt.