水杨酸对豇豆枯萎菌的抑制作用

The Effects of Salicylic Acid on Yardlong Bean Fusarium Wilt Fungus

观察了不同浓度的水杨酸（salicylicacid，SA）对豇豆枯萎病病菌的孢子萌发、菌丝生长、感病品种挑战接种后幼苗发病率、β-1，3-葡聚糖酶和几丁质酶酶活性变化的影响。结果表明：大于2．0mmol／L的SA溶液都能显著地抑制豇豆枯萎病病菌孢子的萌发；在1．0～10．0mmol／L范围内，SA浓度越大对菌丝的抑制作用越强；在不影响豇豆感病品种幼苗正常生长的情况下，以5．0mmol／L的SA最为有效，幼苗发病率仅为23．2％；感病品种经SA处理后引起了β-1，3-葡聚糖酶和几丁质酶活性的升高，挑战接种后的酶活性变化比未经SA处理的上升早且快。

Salicylic acid（SA） at different concentration was tested on conidial germination and mycelial growth of yardlongbean fusarium wilt fungus, disease rate, chitinase and β-1, 3-glucosanase activity of seedling after challenge inoculation in the experiment. The results indicated：that SA at the concentration of above 2.0 mmol/L had inhibition to the conidial germination. At 1.0- 10.0 mmol/L SA had inhibition to the mycelial growth. Without any harm to the seedling, treatment with SA at 0.5 mmol/L was most effective and reduced the infection rate by 63.2 %. SA enhanced the activity of the two enzymes in the susceptible cultivar,compared to the plants without SA treatment. In the plants with prior SA treatment β-1,3-glucosanase and chitinase were activated significantly earlier when the host plants were further challenged by the pathogen.