Suppression of early stages of fungus development by hydrogen peroxide at low concentrations

Hydrogen peroxide mediates some anti-infectional responses of plants. It is toxic to pathogenous bacteria and fungi. To evaluate its minimal fungitoxic amounts, it was applied to spores of the causal agents of cucurbit scab (Cladosporium cucumerinum) and rice blast (Magnaporthe grisea, formerly Pyricularia oryzae) over the broad concentration range (10-2 to 10-14 M). Spore germination and appressorium formation were examined. The dose-response dependence was found multimodal for both fungi. The inhibition of spore germination was maximal at 10-2 M and practically disappeared at 10-5 - 10-6 M H2O2. However, weaker peroxide solutions had increased fungitoxicity. The inhibition of C. cucumerinum spore germination at 10-11- 10-12 M was almost the same extent as at 10-2 M H2O2. For M. grisea, two maxima of germination inhibition near 10-7 M and 10-10 M H2O2 were found. Here, the toxicity was higher than at its millimolar concentration. M. grisea appressoria formation repeated the aforementioned pattern generally. Therefore, hydrogen peroxide can have an antifungal action at very low concentrations. Such small amounts of H2O2 might be sufficient for plant defense responses as well. © 2007 Asian Network for Scientific Information.

Авторы
Aver'yanov A.A.1, 4 , Lapikova V.P.1 , Pasechnik T.D.1 , Kuznetsov V.V. 2 , Baker C.J.3
Издательство
Asian Network for Scientific Information
Номер выпуска
3
Язык
Английский
Страницы
242-247
Статус
Опубликовано
Том
6
Год
2007
Организации
  • 1 Research Institute of Phytopathology, Russian Academy of Agricultural Sciences, B. Vyazemy, 143050, Russian Federation
  • 2 Russian People's Friendship University, Faculty of Agriculture, 8 Miklukho-Maklaya str., Moscow 117198, Russian Federation
  • 3 Molecular Plant Pathology Lab., ARS USDA, Beltsville, MD 20705, United States
  • 4 Research Institute of Phytopathology, B. Vyazemy, 143050, Russian Federation
Ключевые слова
Cladosporium cucumerinum; Cucurbit scab; Fungitoxicity; Magnaporthe grisea; Rice blast
Дата создания
19.10.2018
Дата изменения
19.10.2018
Постоянная ссылка
https://repository.rudn.ru/ru/records/article/record/3287/