Strain JA430
T is a Gram-negative, vibrioid to spiral shaped phototrophic purple sulfur bacterium isolated from anoxic sediment of a saltern at Kanyakumari in a mineral salts medium that contained 2% NaCl (w/v). Strain JA430
T grows optimally at 5−6% NaCl and tolerates up to 12% NaCl. Intracellular photosynthetic membranes were of the lamellar type. Bacteriochlorophyll
a and carotenoids of the spirilloxanthin series are present as photosynthetic pigments. Major cellular fatty acids are C
18:1ω7c, C
16:0, C
19:0cycloω8c and C
16:1ω7c/C
16:1ω6c. Strain JA430
T exhibits photoorganoheterotrophy and chemoorganoheterotrophy and requires
para-aminobenzoic acid, pantothenate and pyridoxal phosphate for growth. Phylogenetic analysis on the basis of 16S rRNA gene sequence analysis showed that strain JA430
T forms monophyletic group in the genus
Ectothiorhodospira. The highest sequence similarity for strain JA430
T was found with the type strains of
Ectothiorhodospira variabilis DSM 21381
T (96.1%) and
Ectothiorhodospira haloalkaliphila ATCC 51935
T (96.2%)
. Morphological and physiological characteristics discriminate strain JA430
T from other species of the genus
Ectothiorhodospira, for which we describe this as a novel species,
Ectothiorhodospira salini sp. nov. ( = NBRC 105915
T = KCTC 5805
T).
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