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Biocontrol potential and plant growth promotional activity of fluorescent pseudomonads of western ghats

KrishiKosh

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Title Biocontrol potential and plant growth promotional activity of fluorescent pseudomonads of western ghats
 
Creator B.Shivakumar
 
Contributor A.R.Alagawadi
 
Subject Agricultural Microbiology
 
Description Nineteen fluorescent pseudomonads of Western Ghats of Uttar Kannada district and
two reference strains were studied for their in vitro biocontrol potential against four fungal
pathogens, three bacterial pathogens and a plant pathogenic nematode. Seven isolates and two
reference strains showed inhibitory activity against all the eight pathogens. While nine
isolates were able to control seven plant pathogens, two isolates showed inhibitory activity
against six pathogens and one isolate inhibited five of the pathogens tested.
All isolates produced HCN and siderophores. Among the isolates, 6 isolates were
identified as high HCN producers and a few isolates showed significantly higher production
of siderophores over other isolates as well as the two reference strains. Seven selected
isolates along with the two reference strains also produced antimicrobial metabolites having
Rf values ranging from 0.16 to 0.97.
The better performing isolates of fluorescent psuedomonads were further studied for
their biocontrol potential against fungal, bacterial and nematode pathogens inoculated to soil
under green house conditions. Two isolates (427 and 227(2)) exhibited one hundred per cent
control of collar rot of groundnut caused by Sclerotium rolfsii. Similarly, in another
experiment isolate 433(1) showed 91.00 per cent control of bacterial wilt of tomato caused by
Ralstonia solanacerum. In the third experiment the isolates 518(1), 173(3) and 427 performed
much better against root knot nematode, Meloidogyne incognita, in tomato by recording
minimum number of galls per plant as well as gall index (0.66) as compared to reference
strain, other isolates and the control.
Out of 19 strains tested for growth promotional activity of groundnut plants under
green house condition, most of the strains showed significant increase in the plant growth
parameters, dry matter content, nutrient uptake and pod yield of groundnut plants over
uninoculated control.
 
Date 2016-10-17T11:30:58Z
2016-10-17T11:30:58Z
2007
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/80685
 
Format application/pdf
 
Publisher UAS, Dharwad