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Studies on plant growth promoting rhizomicroorganisms of tea (camellia sinensis l. (o.) kuntze) plants

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Title Studies on plant growth promoting rhizomicroorganisms of tea (camellia sinensis l. (o.) kuntze) plants
 
Creator Priyanthi K.Tennakoon
 
Contributor A.R.Alagawadi
 
Subject Agricultural Microbiology
 
Description In the investigations carried out on plant growth promoting rhizomicroorganisms of
tea plants, 20 Azospirillum, 18 Beijerinckia, 23 PSB and 28 fluorescent pseudomonads and 10
Bacillus were isolated from rhizosphere of tea plants grown in Kodagu district of Karnataka.
All the isolates were tentatively identified based on morphological, biochemical and
physiological characters. The isolates were also examined for various beneficial characters
and for growth promotional activity in tea plants.
The amount of nitrogen fixed by Azospirillum isolates ranged from 7.23 to
22.16 mg g-1 malate. Sixteen Azospirillum isolates produced both IAA and GA in the range of
334 to 874 μg and 33 to 230 μg L-1 broth, respectively. Nitrogen fixation by Beijerinckia
isolates ranged from 2.86 to 5.54 mg g-1 of glucose. Five Beijerinckia isolates produced both
IAA and GA which ranged from 53 to 169 μg and 44 to 90 μg L-1 broth, respectively. The
amount of Pi released by PSB isolates ranged from 9.54 to 26.11 per cent. Ten PSB isolates
produced IAA and GA which ranged from 54 to 357 μg and 37 to 166 μg L-1 broth,
respectively. All 28 fluorescent pseudomonads solubilized tricalcium phosphate in the range
of 9.39 to 22.97 per cent. Sixteen of them produced IAA and GA in the range of 126 to 664
μg and 32 to 284 μg L-1 broth. Eleven fluorescent pseudomonads also showed in vitro
inhibitory activity against plant pathogenic fungi, viz., Pestolotia thea, Fusarium oxysporum,
Rhizoctonia bataticola and Sclerotium rolfsii. The biocontrol mechanisms in the antagonistic
isolates included production of siderophores, volatile compounds and antimicrobial
metabolites.
In nursery evaluation, 9 Azospirillum isolates and seven each of phosphate
solubilizing bacteria and fluorescent pseudomonads improved growth, dry matter content and
nutrient uptake of tea plants significantly over control.
 
Date 2016-10-17T11:35:00Z
2016-10-17T11:35:00Z
2007
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/80687
 
Format application/pdf
 
Publisher UAS, Dharwad