Endophytic colonization of Typha australis by a plant growth-promoting bacterium Klebsiella oxytoca strain GR-3.

Endophytic colonization of Typha australis by a plant growth-promoting bacterium Klebsiella oxytoca strain GR-3. Research Abstract Details 

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Endophytic colonization of Typha australis by a plant growth-promoting bacterium Klebsiella oxytoca strain GR-3. Abstract Text:

P N Jha,A Kumar,

AIMS: To isolate and characterize endophytic diazotrophic bacteria from a semi-aquatic grass (Typha australis) which grows luxuriantly with no addition of any nitrogen source. METHODS AND RESULTS: Ten endophytic diazotrophic bacteria from surface-sterilized roots and culm of T. australis were isolated and screened for plant growth-promoting activities employing standard methods. Based on the rate of nitrogenase activity, indole acetic acid (IAA) production and phosphate (P) solubilization, one root isolate namely GR-3 was found to be the most efficient one. This isolate was identified as Klebsiella oxytoca on the basis of 16S rDNA sequence analysis. Amplification of nifH by polymerase chain reaction (PCR) and detection of dinitrogenase reductase by western blot confirmed the diazotrophic nature of GR-3. It was tagged with gusA fused to a constitutive promoter and the resulting transconjugant was inoculated onto endophyte-free rice variety Malviya dhan-36 seedlings to express cross-infection ability which resulted in a significant increase in root/shoot length and chlorophyll a content. CONCLUSIONS: Roots and culm of T. australis harbour several endophytic diazotrophic bacteria. One root isolate, identified as K. oxytoca GR-3, seems to be an efficient plant growth-promoting bacterium. SIGNIFICANCE AND IMPACT OF THE STUDY: Plant growth-promoting properties of GR-3 suggest that this promising isolate merits further investigations for potential application in agriculture.

Endophytic colonization of Typha australis by a plant growth-promoting bacterium Klebsiella oxytoca strain GR-3. Publishing Authors By Initials

PN Jha,A Kumar,

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Endophytic colonization of Typha australis by a plant growth-promoting bacterium Klebsiella oxytoca strain GR-3. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Journal of applied microbiology

VOLUME: 103

Page Numbers: 1311-20

Journal Abbreviation: J. Appl. Microbiol.

ISSN: 1364-5072

DAY: 27

MONTH: Oct

YEAR: 2007

Endophytic colonization of Typha australis by a plant growth-promoting bacterium Klebsiella oxytoca strain GR-3. Information

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LANGUAGE: eng

NlmUniqueID: 9706280

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Grant and Affiliation Information for Endophytic colonization of Typha australis by a plant growth-promoting bacterium Klebsiella oxytoca strain GR-3.

AFFILIATION: Microbial Biotechnology Unit, School of Biotechnology, Banaras Hindu University, Varanasi 221 005, India.

Country: England

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MEDLINETA: J Appl Microbiol

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