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ISOLATION AND STUDY OF PLANT GROWTH PROMOTING RHIZOBACTERIA FROM SOILS OF RANGAREDDY DISTRICT

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Title ISOLATION AND STUDY OF PLANT GROWTH PROMOTING RHIZOBACTERIA FROM SOILS OF RANGAREDDY DISTRICT
 
Creator SARVANI, Bh
 
Contributor SUBHASH REDDY, R
 
Subject bacteria, fungi, planting, biological development, diseases, productivity, rhizobium, inorganic acid salts, biochemical compounds, growth promoters
RANGAREDDY DISTRICT
 
Description Plant growth promoting rhizobacteria (PGPR) are beneficial bacteria that colonize
plant roots and enhance plant growth by a wide variety of mechanisms. The use of PGPR is
steadily increasing in agriculture and offers an attractive way to replace chemical fertilizers
and pesticides. Keeping this in view an experiment entitled “Isolation and Study of Plant
growth promoting rhizobacteria from soils of Rangareddy district” was conducted at
Department of Agricultural Microbiology and Bioenergy, College of Agriculture,
Rajendranagar, Hyderabad for characterizing efficient PGPR isolates with multiple
beneficial activities. Forty bacterial isolates were isolated from the Groundnut and Redgram
crops and were identified as Rhizobium (10), Pseudomonas (15) and Bacillus (15) isolates.
These isolates were screened in vitro for Plant growth promoting attributes like phosphate
solubilization, production of Indole acetic acid (IAA), hydrogen cyanide (HCN) and are
further studied for their antagonism against three soil borne pathogens viz., Rhizoctonia
solani, Sclerotium rolfsii and Fusarium solani. These isolates are further tested for their
compatibility with the commonly used agrochemicals, i.e. fungicides (Copper oxy chloride,
Carbendazim, Thiram and Captan), insecticides (Phorate, Carbofuran, Imidachloprid and
Chlorpyriphos) and herbicides (Alachlor, Butachlor, Pendimethalin and Oxy fluorofen).
Results revealed that all the Rhizobium isolates showed positive results for phosphate
solubilization, production of IAA and HCN. The Rhizobium isolates, SBGR, KRR and
AGR showed maximum antagonism against Rhizoctonia solani, Sclerotium rolfsii and
Fusarium solani respectively. 70% of these isolates showed siderophore production. Many
of these isolates showed compatibility with the common fungicides, insecticides, but only
two rhizobial isolates (DRR and SBGR) were compatible with all herbicides used in the
present study.
80% of the Pseudomonas isolates except SFRP, AGP and MGP showed phosphate
solubilization. 80% of the isolates showed IAA production. The Pseudomonas isolates,
DGP, SBRP and SBGP exhibited maximum inhibition against Rhizoctonia solani,
Sclerotium rolfsii and Fusarium solani respectively. While 80% of these isolates produced
siderophores and 40% of the isolates produced HCN. Majority of the isolates showed
compatibility with all the agrochemicals used in the present study.
Regarding Bacillus isolates, 33% of them solubilized phosphorus and produced IAA.
The Bacillus isolate, ARB showed higher biocontrol activity against Rhizoctonia solani,
Sclerotium rolfsii and Fusarium solani. 33% of the isolates expressed for siderophores and
HCN production. All the Bacillus isolates showed their compatibility with all the
fungicides except Thiram and Captan, insecticides and herbicides.
From the present investigation, it can be inferred that PGPR due to their multiple
beneficial activities increase the plant growth and soil fertility by direct and indirect means.
Direct means through nutrient supply such as biological nitrogen fixation, phosphate
solubilization, production of plant growth promoting substances like IAA etc. Indirect
means through biocontrol activity by production of siderophores and HCN. These PGPR
are eco-friendly in nature and cost effective and therefore their use in crop production
makes agriculture profitable and sustainable.
 
Date 2016-06-07T14:13:52Z
2016-06-07T14:13:52Z
2011
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/66943
 
Language en
 
Relation D8844;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY