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Weighted morphology: a new approach towards phylogenetic assessment of Nostocales (Cyanobacteria)

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Abstract

The classification of order Nostocales (Cyanobacteria) and inter relationships of morphologically similar taxa is still debatable due to ever changing morphological features. No attempt has been made to improve the morphological taxonomy despite the fact that it is the morphology that represents the totality of genes. To test the validity of morphological taxonomy and fine tune the phylogenetic relationships within the order Nostocales a new weighted morphology approach was applied by using 76 isolates and their 16S rRNA gene sequences. Further, the study was extended with morphological data set of the remaining 232 taxa for which no molecular data are yet available. Trichome aggregation, heterocyst shape, and akinete shape are suggested as important and stable features for identification. At 30 % weight assignment to the selected morphological characters, morphological taxonomy found 36 % compatible with 16S tree. Adding weight to the morphological characters considerably improved the congruence between the morphology and 16S rRNA-based phylogenetic trees of the order Nostocales. When the weighting procedure was extended to all the Nostocalean members irrespective of molecular data availability, it was found that Nostoc sphaericum and Nostoc microscopicum closely assembled in a single clade. Closer arrangement of Aulosira and Nodularia represent the subfamily aulosirae (Bornet and Flahault Ann Sci Nat Bot 7:223–224, 1888) while taxonomic affiliation of Cylindrospermum with Nostoc, Anabaena, and Raphidiopsis representing the subfamily anabaenae (Bornet and Flahault Ann Sci Nat Bot 7:223–224, 1888) was resolved.

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Acknowledgments

Lal Chand Rai is thankful to DST for project and J.C Bose National Fellowship. Poonam Bhargava is thankful to DST for young scientist. Siba Prasad Adhikary is thankful to Visva Bharati, Santiniketana, (W.B). Thanks to the following for providing us cyanobacterial samples: G.L. Tiwari, Siba Prasad Adhikary and Indian Agricultural Research Institute, Pusa New Delhi. Thanks to Sarita, Alok, Chhavi and Niharika, for genomic DNA isolation and PCR optimization. We are also thankful to Subhash Chandra Lakhotia, the Incharge microscopy section, Laboratory of Cytogenetics, Zoology Department, Banaras Hindu University.

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Authors and Affiliations

  1. Centre of Advanced Study in Botany, Banaras Hindu University, Varanasi, 221005, India

    Swati Mishra & Lal Chand Rai

  2. Department of Biotechnology, Birla Institute of Scientific Research, Jaipur, India

    Poonam Bhargava

  3. Department of Biotechnology, Visva Bharati University, Santiniketan, West Bengal, India

    Siba Prasad Adhikary

  4. Department of Statistics, University of Kentucky, Kentucky, 40536, USA

    Anubhav Pradeep

Authors
  1. Swati Mishra
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  2. Poonam Bhargava
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  3. Siba Prasad Adhikary
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  4. Anubhav Pradeep
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  5. Lal Chand Rai
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Correspondence to Swati Mishra.

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Handling Editor: Peter Nick

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Appendix 1

Matrix and characters with their different states and their description for 76 taxa. (TXT 8 kb)

Appendix 2

Matrix and characters with states and their description for 232 taxa (TXT 18 kb)

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Mishra, S., Bhargava, P., Adhikary, S.P. et al. Weighted morphology: a new approach towards phylogenetic assessment of Nostocales (Cyanobacteria). Protoplasma 252, 145–163 (2015). https://doi.org/10.1007/s00709-014-0629-9

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  • DOI: https://doi.org/10.1007/s00709-014-0629-9

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