Authors: S Nishanth Kumar Bala Nambisan
Publish Date: 2013/10/12
Volume: 172, Issue: 2, Pages: 741-754
Abstract
The present study aimed to investigate antifungal activity of a stilbene and diketopiperazine compounds against plant pathogenic fungi including Phytophthora capsici P colocasiae Botrytis cinerea and Colletotrichum gloeosporioides Minimal inhibition concentrations MIC and minimal fungicidal concentrations MFC of stilbenes and diketopiperazines for each fungus were determined using microplate method Best activity was recorded by stilbenes against P capsici and P colocasiae All four test compounds were effective in inhibiting different stages of the life cycle of test fungi Stilbenes were more effective than diketopiperazines in inhibiting mycelial growth and inhibiting different stages of the life cycle of P capsici and P colocasiae Rupture of released zoospores induced by stilbenes was reduced by addition of 100 mM glucose The effects of stilbenes on mycelial growth and zoospore release but not zoospore rupture were reduced largely when pH value was above 7 In addition stilbenes were investigated for its antifungal stability against Phytophthora sp The results showed that stilbenes maintained strong fungistatic activity over a wide pH range pH 4–9 and temperature range 70–120 °C The compound stilbenes exhibited strong and stable broadspectrum antifungal activity and had a significant fungicidal effect on fungal cells Results from prebiocontrol evaluations performed to date are probably useful in the search for alternative approaches to controlling serious plant pathogens
Keywords: