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CHARACTERIZATION OF INDOLE ACETIC ACID BIOSYNTHESIS IN SELECTED PLANT GROWTH PROMOTING RHIZOBACTERIA OF WHEAT

KrishiKosh

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Title CHARACTERIZATION OF INDOLE ACETIC ACID BIOSYNTHESIS IN SELECTED PLANT GROWTH PROMOTING RHIZOBACTERIA OF WHEAT
Ph. D
 
Creator MANJUNATH, M.
 
Contributor Radha Prasanna)
 
Subject bacteria, planting, iaa, biological development, cyanobacteria, productivity, amino acids, vegetative propagation, acidity, wheats
 
Description T-8612
Microorganisms inhabiting the rhizosphere of plants are well known for production of
auxins, particularly indole-3-acetic acid which plays a significant role in plant growth
promotion. The present study was undertaken to evaluate the role of tryptophan and
aeration on IAA production by a set of rhizobacteria. Two bacterial strains WRB4
(Providencia sp.) and WRB10 (Alcaligenes sp.) exhibited highest IAA production and
enhanced germination, growth of coleoptile and radicle of wheat. Among the
cyanobacterial strains, WRC3 (Anabaena oscillarioides) and WRC4 (Anabaena
torulosa) exhibited significantly higher IAA in the absence of tryptophan and
performed better in seed germination assay. The hydroponic experiment revealed that
seed imbibition with WRB4, followed by WRC3 and combinations of WRC4 +
WRB4 were most promising in terms of plant growth parameters. Thin layer
chromatographic analyses followed by HPLC further confirmed IAA production by
the cultures in media and the hydroponic experiment. This is a first time report on
IAA production and plant growth promotion in wheat by bacteria belonging to the
genera Alcaligenes and Providencia and their synergistic interactions with
cyanobacteria.
 
Date 2016-09-26T19:24:28Z
2016-09-26T19:24:28Z
2010
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/78992
 
Format application/pdf
 
Publisher IARI, DIVISION OF MICROBIOLOGY