Cargando…

Morphology, mating system and taxonomy of Volvox africanus (Volvocaceae, Chlorophyceae) from Thailand

BACKGROUND: The oogamous green algal genus Volvox exhibits extensive diversity in mating systems, including heterothallism and homothallism with unisexual (male and/or female) and/or bisexual spheroids. Although four mating systems have been recognized worldwide in strains identified as “Volvox afri...

Descripción completa

Detalles Bibliográficos
Autores principales: Nozaki, Hisayoshi, Mahakham, Wuttipong, Heman, Wirawan, Matsuzaki, Ryo, Kawachi, Masanobu
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer Singapore 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8782957/
https://www.ncbi.nlm.nih.gov/pubmed/35061120
http://dx.doi.org/10.1186/s40529-022-00332-1
_version_ 1784638421234352128
author Nozaki, Hisayoshi
Mahakham, Wuttipong
Heman, Wirawan
Matsuzaki, Ryo
Kawachi, Masanobu
author_facet Nozaki, Hisayoshi
Mahakham, Wuttipong
Heman, Wirawan
Matsuzaki, Ryo
Kawachi, Masanobu
author_sort Nozaki, Hisayoshi
collection PubMed
description BACKGROUND: The oogamous green algal genus Volvox exhibits extensive diversity in mating systems, including heterothallism and homothallism with unisexual (male and/or female) and/or bisexual spheroids. Although four mating systems have been recognized worldwide in strains identified as “Volvox africanus”, most of these strains are extinct. However, we previously rediscovered two types of the four mating systems (heterothallic, and homothallic with male and bisexual spheroids within a clone) from an ancient Japanese lake, Lake Biwa. RESULTS: Here, we obtained strains exhibiting the third mating system (homothallic with unisexual male and female spheroids within a clone) from a freshwater area of Kalasin Province, Thailand. When sexual reproduction was induced in the present Thai strains, both male and female unisexual spheroids developed to form smooth-walled zygotes within a clonal culture. Phylogenetic analyses of the internal transcribed spacer region-2 of nuclear ribosomal DNA sequences from all four mating systems, including the extinct strains, resolved the third mating system is basal or paraphyletic within the homothallic clade. CONCLUSIONS: The present morphological and molecular data of the Thai strains indicate that they belong to the homothallic species V. africanus. The phylogenetic results suggested that third mating system (homothallic with separate male and female sexual spheroids) may represent an initial evolutionary stage of transition from heterothallism to homothallism within Volvox africanus. Further field collections in geologically stable intracontinental regions may be fruitful for studying diversity and taxonomy of the freshwater green algal genus Volvox.
format Online
Article
Text
id pubmed-8782957
institution National Center for Biotechnology Information
language English
publishDate 2022
publisher Springer Singapore
record_format MEDLINE/PubMed
spelling pubmed-87829572022-02-02 Morphology, mating system and taxonomy of Volvox africanus (Volvocaceae, Chlorophyceae) from Thailand Nozaki, Hisayoshi Mahakham, Wuttipong Heman, Wirawan Matsuzaki, Ryo Kawachi, Masanobu Bot Stud Original Article BACKGROUND: The oogamous green algal genus Volvox exhibits extensive diversity in mating systems, including heterothallism and homothallism with unisexual (male and/or female) and/or bisexual spheroids. Although four mating systems have been recognized worldwide in strains identified as “Volvox africanus”, most of these strains are extinct. However, we previously rediscovered two types of the four mating systems (heterothallic, and homothallic with male and bisexual spheroids within a clone) from an ancient Japanese lake, Lake Biwa. RESULTS: Here, we obtained strains exhibiting the third mating system (homothallic with unisexual male and female spheroids within a clone) from a freshwater area of Kalasin Province, Thailand. When sexual reproduction was induced in the present Thai strains, both male and female unisexual spheroids developed to form smooth-walled zygotes within a clonal culture. Phylogenetic analyses of the internal transcribed spacer region-2 of nuclear ribosomal DNA sequences from all four mating systems, including the extinct strains, resolved the third mating system is basal or paraphyletic within the homothallic clade. CONCLUSIONS: The present morphological and molecular data of the Thai strains indicate that they belong to the homothallic species V. africanus. The phylogenetic results suggested that third mating system (homothallic with separate male and female sexual spheroids) may represent an initial evolutionary stage of transition from heterothallism to homothallism within Volvox africanus. Further field collections in geologically stable intracontinental regions may be fruitful for studying diversity and taxonomy of the freshwater green algal genus Volvox. Springer Singapore 2022-01-21 /pmc/articles/PMC8782957/ /pubmed/35061120 http://dx.doi.org/10.1186/s40529-022-00332-1 Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Original Article
Nozaki, Hisayoshi
Mahakham, Wuttipong
Heman, Wirawan
Matsuzaki, Ryo
Kawachi, Masanobu
Morphology, mating system and taxonomy of Volvox africanus (Volvocaceae, Chlorophyceae) from Thailand
title Morphology, mating system and taxonomy of Volvox africanus (Volvocaceae, Chlorophyceae) from Thailand
title_full Morphology, mating system and taxonomy of Volvox africanus (Volvocaceae, Chlorophyceae) from Thailand
title_fullStr Morphology, mating system and taxonomy of Volvox africanus (Volvocaceae, Chlorophyceae) from Thailand
title_full_unstemmed Morphology, mating system and taxonomy of Volvox africanus (Volvocaceae, Chlorophyceae) from Thailand
title_short Morphology, mating system and taxonomy of Volvox africanus (Volvocaceae, Chlorophyceae) from Thailand
title_sort morphology, mating system and taxonomy of volvox africanus (volvocaceae, chlorophyceae) from thailand
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8782957/
https://www.ncbi.nlm.nih.gov/pubmed/35061120
http://dx.doi.org/10.1186/s40529-022-00332-1
work_keys_str_mv AT nozakihisayoshi morphologymatingsystemandtaxonomyofvolvoxafricanusvolvocaceaechlorophyceaefromthailand
AT mahakhamwuttipong morphologymatingsystemandtaxonomyofvolvoxafricanusvolvocaceaechlorophyceaefromthailand
AT hemanwirawan morphologymatingsystemandtaxonomyofvolvoxafricanusvolvocaceaechlorophyceaefromthailand
AT matsuzakiryo morphologymatingsystemandtaxonomyofvolvoxafricanusvolvocaceaechlorophyceaefromthailand
AT kawachimasanobu morphologymatingsystemandtaxonomyofvolvoxafricanusvolvocaceaechlorophyceaefromthailand