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JPR Advance Access originally published online on July 8, 2009
Journal of Plankton Research 2009 31(10):1141-1150; doi:10.1093/plankt/fbp055
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© The Author 2009. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Genetic heterogeneity of the marine cyanobacterium Leptolyngbya valderiana (Pseudanabaenaceae) evidenced by RAPD molecular markers and 16S rDNA sequence data

Jagadeesan Premanandh*, Balakrishnan Priya, Dharmar Prabaharan and Lakshmanan Uma

National Facility for Marine Cyanobacteria, Bharathidasan University, Palkalaiperur, Tiruchirapalli 620024, India

* CORRESPONDING AUTHOR: jpanandh{at}yahoo.com

Received on April 9, 2009; accepted on June 13, 2009


  Abstract

The distribution and diversity patterns of the cosmopolitan marine cyanobacterium Leptolyngbya valderiana (Pseudanabaenaceae, Cyanobacteria) were studied. To asses the level of genetic diversity, morphotypes from different geographical locations (Coast of south India and Andaman) were subjected to randomly amplified polymorphic DNA (RAPD) analysis and partial 16S rRNA gene sequence studies. Morphologically and ecologically, all strains fit the currently circumscribed L. valderiana. However, RAPD primers yielded 100% polymorphism among the studied strains, indicating a considerable degree of intra-specific genomic heterogeneity, with percent similarity between 13 and 82%. Partial 16S rDNA sequence similarity values ranged from 91 to 99%. In conclusion, the genetic variability observed within the marine strains of L. valderiana indicates the presence of cryptic species. Thus, future investigations combining well-characterized ultra-structural morphology with additional molecular markers are essential to characterize and clarify the patterns in the evolution and biogeography.

Corresponding editor: William Li


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