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Studies on plant growth promoting rhizobacteria for the management of root knot nematode(Meloidogyne incognita) of Tomato

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Title Studies on plant growth promoting rhizobacteria for the management of root knot nematode(Meloidogyne incognita) of Tomato
 
Creator Linh.Dang.Thuy
 
Contributor S.Lingaraju
 
Subject Plant pathology
 
Description The ability of native strains of plant growth promoting rhizobacteria to suppress the
juveniles of Meloidogyne incognita causing root knot disease of tomato was investigated in
vivo. The most efficacious strains were characterized based on their morphology and
biochemical tests. They were used in vivo studies in green house to see if they reduce the root
knot disease on tomato.
Nine strains (designated as St 1, St 2, so on and so forth) isolated from health tomato
rhizospheres of Main Agricultural Research Station, Dharwad were tested for their efficacy:
The highest mortality percentage was observed in the culture filtrate of St 2 (100), St 9 (100)
and St 3 (79). Based on antagonistic effect on root knot nematode, three strains were
identified as belonging to Bacillus spp. (St 2 and St 3) and one to Micrococcus sp. (St 9).
They were selected for testing their growth promotion activity and talc formulations were
prepared and used for pot culture experiment.
Three strains showed plant growth promotion in terms of seed germination in both
roll towel and pot culture studies. Seedling vigour was improved due to seed inoculation with
St 2 (1482), St 9 (1411) and St 3 (1311) at 15 days by roll towel method. But at 60 DAS in
pot culture, only St 9 strain recorded improved in seedling vigour index (2615).
The pot culture studies on the efficacy of talc based formulation of the isolates against
M. incognita in tomato revealed that the inoculation with strains St 2 and St 9 significantly
enhanced the plant growth parameters, viz. shoot length, root length and fresh weight.
Significant reduction in root galls was observed in St 2 treatment which recorded reduced
root knot index up to 80 per cent over control, followed by St 3 and St 9 treatments.
 
Date 2016-10-27T18:46:55Z
2016-10-27T18:46:55Z
2008
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/82622
 
Format application/pdf
 
Publisher UAS, Dharwad