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Issue: Vol. 307 No. 4: 30 May 2017
Type: Article
Published: 2017-05-30
DOI: 10.11646/phytotaxa.307.4.4
Page range: 263–277
Abstract views: 18
PDF downloaded: 1

Polyphasic analysis for elucidating the taxonomic position of selected unicellular marine cyanobacteria from Indian and Hong Kong coast

National Facility for Marine Cyanobacteria (Sponsored by DBT, Govt. of India), Department of Marine Biotechnology, School of Marine Sciences, Bharathidasan University, Tiruchirappalli – 620 024, Tamil Nadu, India.
National Facility for Marine Cyanobacteria (Sponsored by DBT, Govt. of India), Department of Marine Biotechnology, School of Marine Sciences, Bharathidasan University, Tiruchirappalli – 620 024, Tamil Nadu, India.
National Facility for Marine Cyanobacteria (Sponsored by DBT, Govt. of India), Department of Marine Biotechnology, School of Marine Sciences, Bharathidasan University, Tiruchirappalli – 620 024, Tamil Nadu, India.
National Facility for Marine Cyanobacteria (Sponsored by DBT, Govt. of India), Department of Marine Biotechnology, School of Marine Sciences, Bharathidasan University, Tiruchirappalli – 620 024, Tamil Nadu, India.
National Facility for Marine Cyanobacteria (Sponsored by DBT, Govt. of India), Department of Marine Biotechnology, School of Marine Sciences, Bharathidasan University, Tiruchirappalli – 620 024, Tamil Nadu, India.
National Facility for Marine Cyanobacteria (Sponsored by DBT, Govt. of India), Department of Marine Biotechnology, School of Marine Sciences, Bharathidasan University, Tiruchirappalli – 620 024, Tamil Nadu, India.
National Facility for Marine Cyanobacteria (Sponsored by DBT, Govt. of India), Department of Marine Biotechnology, School of Marine Sciences, Bharathidasan University, Tiruchirappalli – 620 024, Tamil Nadu, India.
National Facility for Marine Cyanobacteria (Sponsored by DBT, Govt. of India), Department of Marine Biotechnology, School of Marine Sciences, Bharathidasan University, Tiruchirappalli – 620 024, Tamil Nadu, India.
cyanobacteria unicellular Synechococcus elongatus Halothece californica Aphanocapsa Synechocystis pevalekii Gloeocapsopsis crepidinum 16S rRNA internal spacer region General

Abstract

Cyanobacteria, the primordial oxygenic photosynthetic prokaryotes encompass a wide spectrum of morphologies and ecologies. The diversity of twelve marine unicellular cyanobacteria isolated from different marine habitats was analyzed morphologically. The evolutionary relationship among the investigated strains was examined by phylogenetic analysis of nearly complete 16S rRNA gene and 16-23S internal transcribed spacer region. Phylogenetic analysis of both 16S rRNA genes and internal spacer regions exhibited coherent clustering patterns. The genetic relatedness of the investigated strains was largely congruent with morphology-based taxonomic groupings. All the investigated strains possess both the types of tRNA (tRNAIle and tRNAAla) in their 16-23S internal spacer regions and significantly varied GC contents and spacer sequence lengths. Further, ultrastructural studies provide a more valuable insight into the cyanobacterial taxa studied. Our study helps to apply the polyphasic approach (use of morphology, ultra-structure, ecology, and molecular analysis of complete 16S rRNA genes and 16-23S internal spacer regions) to resolve taxonomic ambiguities and provide a fairly robust cyanobacterial classification system among the unicellular forms studied.