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Publication Type J
Authors Ravikumar, S., M. Gnanadesigan, S. T. M. Ignatiammal and S. Sumaya
Title Population dynamics of free living, nitrogen fixing bacteria Azospirillum in Manakkudi mangrove ecosystem, India
Source Journal of Environmental Biology
Author Keywords Azospirillum Ecosystem Mangrove forest Nutrient cycle coastal lagoon soil seedlings growth
Abstract Seasonal variations of population dynamics of free living nitrogen fixing bacteria, Azospirillum in relation to chemical parameters in Manakkudi mangrove eco system was assessed in root and rhizosphere soil samples of mangroves and mangrove associated plants. In rhizosphere soil and root samples, the counts of Azospirillum were recorded maximum in Acrostichum aureum as 8.63 +/- 0.92 x 10(4) and 115.48 +/- 17.36 x 10(4) CFU g(-1), respectively. The counts of Azospirillum in non-rhizosphere soil varied from 0.01 +/- 0.001 x 10(4) to 5.77 +/- 0.92 x 10(4) CFU g(-1) and found maximum in February and minimum in March and September. Azospirillum counts in water samples were found maximum (2.24 x 10(4) CFU l(-1)) in February. During seasonal variations maximum counts of Azospirillum were recorded during southwest monsoon season in Avicennia officinalis (1.40 x 10(4) CFU g(-1)) followed by Rhizophora mucronata (1.07 x 10(4) CFU g(-1)). The average maximum population density of Azospirillum counts was found during non monsoon season (9.73 x 10(4) CFU g(-1)) and the average maximum population density of Azospirillum counts was found with the mangrove associated root samples (13.73 x 10(4) CFU g(-1)). Of the selected isolates Azospirillum lipoferum (60%) was found lobe predominant followed by Azospirillum brasilense (25%), Azospirillum irakense (5%), Azospirillum halopraeferens (5%) and Azospirillum amazonense (5%). Of the isolated species, A. halopraeferens exhibited better growth at 35 g l(-1) NaCl. The level of Fe, Cu, Zn and Mn were varied from 0.91 to 15.93 ppm. The level of Mn (12.13 ppm) was found maximum during non-monsoon of rhizosphere soil sample. Highest rainfall (192.80 mm) and atmospheric temperature (25.10 degrees C) were recorded during south west monsoon and non monsoon seasons. The increased population density was greatly influenced by the pH (r=+0.686). The present finding provides enough information on the nitrogen flow through biological process in Manakkudi mangrove ecosystem which can be useful for the effective implementation of mangrove management plan.
Author Address [Ravikumar, S.; Gnanadesigan, M.] Alagappa Univ, Sch Marine Sci, Dept Oceanog & Coastal Area Studies, Thondi 623409, India. [Ignatiammal, S. Thadedus Maria] Coll Holy Cross, Dept Bot, Nagercoil 629004, India. [Sumaya, S.] Thassim Beevi Abdul Kadar Coll Women, Kilakarai 623517, India. Ravikumar, S (reprint author), Alagappa Univ, Sch Marine Sci, Dept Oceanog & Coastal Area Studies, Thondi 623409, India. ravibiotech201321@gmail.com
ISSN 0254-8704
ISBN 0254-8704
29-Character Source Abbreviation J.Environ.Biol.
Publication Date May
Year Published 2012
Volume 33
Issue 3
Beginning Page 597-602
Unique Article Identifier WOS:000303975800011
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