Taxonomic reassessment of Polysiphonia hainanensis (Rhodomelaceae, Rhodophyta) based on molecular and morphological analyses

Abstract

Polysiphonia hainanensis was previously described from Hainan, China, but DNA sequence had never been provided and its phylogenetic position in Polysiphonieae has not been clear so far. The classification of Polysiphonieae has changed recently based on the molecular analyses and detail morphological anatomy, consequently, the generic assignment of some species must be reassessed. In this study, we analyzed phylogenetic relationships of P. hainanensis and the related taxa in Polysiphonieae and Streblocladieae based on rbcL sequences, with specimens collected from the type locality and the area around. Two genetic types were detected, and formed a clade with Bryocladia thyrsigera with strong bootstrap support, in which the divergence was less than 0.81%. Furthermore, based on morphological analyses, we found characteristics of Chinese specimens, number of pericentral cells, percurrent axis, determinate branchlets, branching pattern, spermatangial axes development, and arrangement of tetrasporangia, etc., were consistent with those of Bryocladia. Combined with morphological and molecular analyses, P. hainanensis was taken a synonymous of B. thyrsigera, and gametophytes of this species were found from China for the first time.

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Correspondence to Ping Li.

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5 Data Availability Statement

The datasets generated and/or analyzed during the current study are available from the corresponding author on reasonable request. Sequence data that support the findings of this study have been deposited in GenBank under the accession numbers MN709123-MN709126.

Supported by the Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) (No. GML2019ZD0606) and the Innovation Projects of Colleges and Universities in Guangdong Province (No. 2016KTSCX038)

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Tan, H., Liu, W. & Li, P. Taxonomic reassessment of Polysiphonia hainanensis (Rhodomelaceae, Rhodophyta) based on molecular and morphological analyses. J. Ocean. Limnol. (2020). https://doi.org/10.1007/s00343-020-0092-8

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Keyword

  • Bryocladia
  • phylogeny
  • Polysiphonieae
  • rbcL