Efficacy of botanical extracts on imparting systemic acquired resistance against rice sheath blight incited by Rhizoctonia solani
The present study unravels the antifungal ability and physio-biochemical basis of resistance induced by botanical extracts against the sheath blight disease of rice incited by Rhizoctonia solani . In vitro screening of botanical extracts against R. solani revealed that an increase in the concentrati...
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Published in | Journal of plant diseases and protection (2006) Vol. 130; no. 3; pp. 551 - 569 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Berlin/Heidelberg
Springer Berlin Heidelberg
01.06.2023
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Subjects | |
Online Access | Get full text |
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Summary: | The present study unravels the antifungal ability and physio-biochemical basis of resistance induced by botanical extracts against the sheath blight disease of rice incited by
Rhizoctonia solani
. In vitro screening of botanical extracts against
R. solani
revealed that an increase in the concentration of botanical extracts increased the inhibition of mycelial growth, though maximum inhibition occurred at 50% concentration.
A. indica
exhibited the highest mycocidal ability, followed by
M. azedarach
and
T. ciliata
. In field experiments, spraying of promising doses of botanical extracts led to a significant reduction in the severity index, AUDPC, and
r
-value when applied 2 days before inoculation. An increase in the endogenous SA content of treated plants gave an indication of the activation of SAR. The induction of resistance was accompanied by the accumulation of various host-related antioxidants and defence enzymes in susceptible cultivar. The results indicate that botanical extracts induce the early activation of disease resistance and that this is mediated through the expression of defence mechanisms.
A. indica
provided excellent control and reduced the disease severity, followed by extracts of
M. azedarach
. The results of the study are significant for developing an environmentally friendly biocide that could be considered an effective tool in integrated management programmes for a sustainable system of sheath blight control. |
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ISSN: | 1861-3829 1861-3837 |
DOI: | 10.1007/s41348-023-00722-y |