Journal
BIOLOGICAL CONTROL
Volume 39, Issue 3, Pages 313-319Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.biocontrol.2006.07.011
Keywords
Streptomyces sp; antifungal metabolites; rice; blast; sheath blight; Pyricularia oryzae; Rhizoctonia solani
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Two antifungal aliphatic compounds, SPM5C-1 and SPM5C-2 with a lactone and ketone carbonyl unit, respectively obtained from Streptomyces sp. PM5 were evaluated under in vitro and in vivo conditions against major rice pathogens, Pyricularia oryzae and Rhizoctonia solani. These compounds were dissolved in distilled water/medium to get the required concentrations. The well diffusion bioassay indicated that the of SPM5C-1 remarkably inhibited the mycelial growth of P. oryzae and R. solani in comparison to SPM5C-2. Though SPM5C-2 showed low antifungal activity against P. oryzae, it was not active against R. solani. Further, SPM5C-1 completely inhibited the growth of P. oryzae and R. solani at concentrations of 25, 50, 75 and 100 mu g/ml. Greenhouse experiments revealed that spraying of SPM5C-1 at 500 mu g/ml on rice significantly decreased blast and sheath blight development by 76.1% and 82.3%, respectively, as compared to the control with a corresponding increase in rice grain yield. (c) 2006 Elsevier Inc. All rights reserved.
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