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Publication Type J
Authors Ravikumar, S; Kathiresan, K; Ignatiammal, STM; Selvam, AB; Shanthy, S
Author Full Name Ravikumar, S; Kathiresan, K; Ignatiammal, STM; Selvam, AB; Shanthy, S
Title Nitrogen-fixing azotobacters from mangrove habitat and their utility as marine biofertilizers
Source JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY
Language English
Document Type Article
Author Keywords Azotobacter; biofertilizer; mangroves; nitrogen fixation; Rhizophora
Keywords Plus SUBSTANCES; FIXATION
Abstract A dearth of information is available for nitrogen-fixing bacteria in coastal mangroves, and hence, the present study has been undertaken to analyse 44 root and associated soil samples, derived from a mangrove habitat of southeast coast of India. The root samples exhibit high counts of total heterotrophic bacteria and azotobacters along with high rates of nitrogen fixation, as compared to the rhizosphere soil samples. Among the plant species, Bruguiera cylindrica records high microbial counts and nitrogen fixation. Front the samples analysed, three species of Azotobacter, viz., A. chroococcum, A. virelandii and A. beijerinchkii were isolated, purified and identified. These species exhibit high growth, nitrogen fixation and in vitro production of phytohormone (Indole Acetic Acid, IAA) at NaCl salinity of 30 g l(-1). The azotobacters, which were inoculated with Rhizophora seedlings, increased significantly the average root biomass up to by 98.2%, the root length by 48.45%, the leaf area by 277.86%, the shoot biomass by 29.49% as compared to controls and they also increased the levels of total chlorophylls and carotenoids up to by 151.0% and 158.73%, respectively. Thus, azotobacterisation is beneficial in raising vigorous seedlings of mangroves in coastal wetlands. (C) 2004 Elsevier B.V. All rights reserved.
Author Address Manonmaniam Sundaranar Univ, Ctr Marine Sci & Technol, Dept Marine Microbiol, Rajakkamangalam 629502, Tamil Nadu, India; Ctr Adv Study Marine Biol, Parangipettai 608502, Tamil Nadu, India; Coll Holy Cross, Dept Bot, Nagercoil 629004, Tamil Nadu, India
Reprint Address Ravikumar, S (reprint author), Manonmaniam Sundaranar Univ, Ctr Marine Sci & Technol, Dept Marine Microbiol, Rajakkamangalam 629502, Tamil Nadu, India.
E-mail Address ravibiotech201320@yahoo.com
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Cited Reference Count 26
Times Cited 30
Total Times Cited Count (WoS, BCI, and CSCD) 38
Publisher ELSEVIER SCIENCE BV
Publisher City AMSTERDAM
Publisher Address PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
ISSN 0022-0981
29-Character Source Abbreviation J EXP MAR BIOL ECOL
ISO Source Abbreviation J. Exp. Mar. Biol. Ecol.
Publication Date NOV 25
Year Published 2004
Volume 312
Issue 1
Beginning Page 5
Ending Page 17
Digital Object Identifier (DOI) 10.1016/j.jembe.2004.05.020
Page Count 13
Web of Science Category Ecology; Marine & Freshwater Biology
Subject Category Environmental Sciences & Ecology; Marine & Freshwater Biology
Document Delivery Number 862QN
Unique Article Identifier WOS:000224506000002
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