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Abstract - Issue Nov 2012, 33 (6) Back
nstantaneous and historical temperature effects on a-pinene
Rhizobacterial
population density and nitrogen fixation in seagrass
community of Gulf
of Mannar, India
Author
Details
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S.
Raja
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Centre
of Advanced Studies in Marine Biology, Faculty of Marine Sciences, Annamalai
University,
Parangipettai-608
502, India ???????????
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T.Thangaradjou
(Corresponding author)
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Centre of Advanced Studies in Marine Biology, Faculty of Marine
Sciences, Annamalai University,
Parangipettai-608 502, India
e-mail : umaradjou@gmail.com?
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K.Sivakumar
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Centre
of Advanced Studies in Marine Biology, Faculty of Marine Sciences, Annamalai
University,
Parangipettai-608
502, India
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L.
Kannan
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Centre
of Advanced Studies in Marine Biology, Faculty of Marine Sciences, Annamalai
University,
Parangipettai-608
502, India
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Publication
Data
Paper received:
25 September 2010
Revised received:
09? September 2011
Accepted:
20?
September 2011
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Abstract
Seagrass rhizosphere generally supports
high bacterial population density which plays a major role in determining the
nutrient cycles of the sea. Higher densities of total heterotrophic bacteria
(26.3 ?106?CFU g-1), nitrogen fixing (27.3 ?103?CFUg-1), ammonifying (44.66 X 106 MPN g-1)
and nitrifying bacteria (42.33 X 106?
MPN g-1?)? have been
registered in the seagrass areas than the non seagrass area. In particular,
all these rhizosphere microbial population was higher in Thalassia
hemprichii. The rates of nitrogen fixation was recorded in the different
species of seagrasses such as Enhalus acoroides (1.166 n mol g-1d-1), Halophila ovalis (0.166 n mol g-1d-1), Thalassia hemprichii (18.5 n mol g-1d-1), Cymodocea serrulata (10.5 n mol g-1d-1), Halodule uninervis (5.375 n mol g-1d-1) and Syringodium isoetifolium (0.666 n mol g-1d-1) using gas chromatography. The average nitrogen
fixation by the seagrasses of Gulf of Mannar alone was estimated to be
7640.58 n mol m-2?d-1?and the contributions from the
rhizosphere microbes will increase the quantity to many fold. ???
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Key words
Rhizosphere
bacteria, Nitrogen fixation, Seagrasses, Gulf of Mannar
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