中国农业科学 ›› 2008, Vol. 41 ›› Issue (1): 86-92 .doi: 10.3864/j.issn.0578-1752.2008.01.011

• 植物保护 • 上一篇    下一篇

MAPK途径对玉米大斑病菌HT-毒素产生和生物学活性的调控作用

范永山,谷守芹,董金皋,董娜   

  1. 河北农业大学真菌毒素实验室
  • 收稿日期:2006-06-26 修回日期:1900-01-01 出版日期:2008-01-10 发布日期:2008-01-10
  • 通讯作者: 董金皋

Regulation of MAPK Signal Pathway on the Production and Biological Activity of HT-toxin in Setosphaeria turcica

  

  1. 河北农业大学真菌毒素实验室
  • Received:2006-06-26 Revised:1900-01-01 Online:2008-01-10 Published:2008-01-10

摘要: 【目的】通过研究促分裂原活化蛋白酶(MAPK)途径对玉米大斑病菌HT-毒素产生及生物学活性的影响,探索该途径对玉米大斑病菌致病性的调控机制。【方法】利用MAPK途径特异性抑制剂U0126分析该途径对玉米大斑病菌HT-毒素产生及活性的影响。【结果】1~20 μmol•L-1 U0126处理后,菌株01-23的HT-毒素组成和含量均发生了变化,部分组分的合成受到抑制,并诱导产生了一些新的毒素组分。1~20 μmol•L-1 U0126处理后获得的HT-毒素在感病寄主B37和B37Ht1玉米自交系上的生物学活性都受到了显著抑制,在B37玉米叶片上的抑制程度强于B37Ht1。随着U0126浓度的增加,菌株01-23的HT-毒素在玉米叶片上产生的坏死斑面积减小,抑制程度增加,但不能完全抑制病斑产生,10 μmol•L-1 U0126处理和20 μmol•L-1 U0126处理间差异不显著。【结论】MAPK信号转导途径对玉米大斑病菌HT-毒素的产生和生物学活性具有一定的调控作用,但HT-毒素的产生和活性还受其它因素影响,具有更复杂的调控机制。

关键词: 玉米大斑病菌, 促分裂原活化蛋白酶, HT-毒素, U0126

Abstract: 【OBJECTIVE】Elucidation of the effects of MAPK signal pathway on the HT-toxin production and biological activity of Setosphaeria turcica, will facilitate the mechanism study of the fungal pathogenicity;【METHOD】The specific MAPK signal pathway inhibitor, U0126, is used to study the regulation of MAPK pathway on HT-toxin production and activity;【RESULTS】The composition and quantity of HT-toxin fractions extracted from isolate 01-23 are significantly altered after treated with 1-20 μmol/L U0126. The production or quantity of some fractions is inhibited and there are some new fractions are induced. The biological activities of HT-toxin on susceptible corn inbred lines, B37 and B37Ht1, are significantly inhibited in isolate 01-23 after treated with 1-20 μmol/L U0126. The inhibition is stronger on B37 than on B37Ht1. The inhibition increases from 1 μmol/L to 20 μmol/L U0126 treatments, but there is no significant difference between the 10 μmol/L and 20 μmol/L U0126 treatments, indicating that U0126 can not completely inhibit the biological activity of HT-toxin;【CONCLUSION】HT-toxin production and biological activity on susceptible corn leaves are regulated by MAPK signal transduction pathway, but the mechanism of HT-toxin production and biological activity in S. turcica is complex and infected by other unknown factors.

Key words: Setosphaeria turcica, MAPK, HT-toxin, U0126