Evaluation of Streptomyces spp. for their plant-growth-promotion traits in rice

Gopalakrishnan, S and Vadlamudi, S and Apparla, S and Bandikinda, P and Vijayabharathi, R and Bhimineni, R K and Rupela, Om (2013) Evaluation of Streptomyces spp. for their plant-growth-promotion traits in rice. Canadian Journal of Microbiology, 59 (8). pp. 534-539. ISSN 1480-3275

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Five strains of Streptomyces (CAI-17, CAI-68, CAI-78, KAI-26, and KAI-27) were previously reported to have potential for charcoal rot control and plant growth promotion (PGP) in sorghum. In this study, those 5 Streptomyces strains were characterized for their enzymatic activities and evaluated for their PGP capabilities on rice. All the Streptomyces strains were able to produce lipase and β-1,3-glucanase; grew in NaCl (up to 8%), at pH 5–13, and at temperatures 20–40 °C; and were resistant to ampicillin, sensitive to nalidixic acid, and highly sensitive to chloramphenicol, kanamycin, streptomycin, and tetracycline. They were highly tolerant to the fungicide bavistin but were highly sensitive to benlate, benomyl, and radonil. When evaluated on rice in the field, Streptomyces significantly enhanced tiller and panicle numbers, stover and grain yields, dry matter, root length, volume and dry weight, compared with the control. In the rhizosphere at harvest, microbial biomass carbon and nitrogen, dehydrogenase activity, total nitrogen, available phosphorus, and % organic carbon were also found significantly higher in Streptomyces-treated plots than in the control plots. This study further confirms that the selected Streptomyces have PGP activities.

Item Type: Article
Uncontrolled Keywords: plant growth promotion, rice, Streptomyces, field evaluation
Subjects: Others > Agriculture-Farming, Production, Technology, Economics
Depositing User: Mr Sanat Kumar Behera
Date Deposited: 24 Aug 2013 06:02
Last Modified: 24 Aug 2013 14:20
URI: http://oar.icrisat.org/id/eprint/7063
Official URL: http://dx.doi.org/10.1139/cjm-2013-0287
Funders: National Bureau of Agriculturally Important Microorganisms (NBAIM)
Acknowledgement: We thank the National Bureau of Agriculturally Important Microorganisms (NBAIM) for providing financial support. We also thank all the staff of the biocontrol unit of ICRISAT including M/s PVS Prasad, P. Manohar, B. Nagappa, D. Barath, A. Jabbar, and S. Rohini for their significant inputs in the laboratory and field studies.
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