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Chitinase Expression Due to Reduction in Fusaric Acid Level in an Antagonistic Trichoderma harzianum S17TH

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Title Chitinase Expression Due to Reduction in Fusaric Acid Level
in an Antagonistic Trichoderma harzianum S17TH
 
Creator Sharma, Vivek
Bhandari, P
Singh , Bikram
Bhattacharya, Amita
Shanmugam, V
 
Subject Plant sciences
 
Description To study the effect of reduction in phytotoxin
level on fungal chitinases, antagonistic Trichoderma spp.
were screened for their ability to reduce the level of fusaric
acid (FA), the phytotoxin produced by Fusarium spp. A
T. harzianum isolate S17TH was able to tolerate high levels
of FA (up to 500 ppm) but was unable to reduce the toxin
to a significant level (non-toxic) added to minimal synthetic
broth (MSB). However, the isolate was able to
reduce 400 ppm FA in the liquid medium after 7 days to a
non-toxic level and displayed similar level of antagonism
over the control (without FA). In studies of the effect of the
reduction in FA (400 ppm) level on chitinase gene
expression in PCR assays, nag1 was significantly repressed
but ech42 expression was only slightly repressed. Chitinase
activity was either reduced or absent in the extracellular
proteins of MSB supplemented with 400 ppm FA, which
could be attributed to the effect of residual FA or its
breakdown products through unknown mechanisms.
Selection of S17TH as a toxin insensitive isolate that could
commensurate the negative effect on chitinase activity
makes it a potential antagonist against Fusarium spp.
 
Date 2012
 
Type Article
PeerReviewed
 
Format application/pdf
 
Identifier http://ihbt.csircentral.net/1335/1/127_Chitinase.pdf
Sharma, Vivek and Bhandari, P and Singh , Bikram and Bhattacharya, Amita and Shanmugam, V (2012) Chitinase Expression Due to Reduction in Fusaric Acid Level in an Antagonistic Trichoderma harzianum S17TH. Indian Journal of Microbiology.
 
Relation http://ihbt.csircentral.net/1335/