Studies on grape rhizosphere microorganisms
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Date
2007
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UAS, Dharwad
Abstract
An attempt was made to know the effect of growth promoting rhizo microorganisms,
isolated from different locations on the growth parameters of Grape cuttings as a planting
material under pot culture conditions. Plant growth promoting rhizo microorganisms
(PGPMs) Such as Azotobacter, (AGR-26 strains), Azospirillum (GAZ-26 strains), phosphate
Solubilizers (PSBG-12 strains), Fluorescent pseudomonas (GPF-20 strains) and Aspergillus
niger (PSBG-12 strains) isolated from different districts (Bagalkot, Bijapur & Belgaum) of
Karnataka and they are characterized based on morphological, biochemical and physiological
characteristics. Then they were screened for their beneficial traits such as N2-fixation,
phosphate solubilization, production of plant growth promoting substances such as IAA, GA
and bio-control under in vitro as well as in vivo condition. By considering all these beneficial
traits one efficient strain was selected from each group to know the consortial effect of these
growth promoting rhizo microorganisms on the growth parameters of grape cutting as a
planting material. All the inoculation treatments showed better effect on plant growth
parameters and nutrient uptake compared to uninoculated control. Among the inoculation
treatments, single inoculation performed better than uninoculated control whereas, dual
inoculations performed better over single inoculation treatments. Combined inoculation of
three beneficial organisms (PSBG-92, AGR-20 + GPF-68) (T24) showed better performance
compared to triple, dual, single inoculation and uninoculated control. With respect to plant
growth parameters and nutrient uptake, the results of our studies indicate that the combined
or consortial inoculations involving three or more beneficial organisms exerts more
favourable effect on growth parameters of grape cutting as a planting material than dual or
single inoculations. Results can be extrapolated to field conditions. The results of
combination of four organisms were on par with combination of five organisms and hence the
desired combination of Azotobacter (AGR-20) + Azospirillum (GAZ-50) + phosphate
solubilizing bacteria (PSB-82) + phosphate solubilizing fungi (PSF-92) + Fluorescent
pseudomonas was producing maximum favourable influence on growth parameters of grape
cuttings and could be recommended for field applications in grape garden.
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Agricultural Microbiology