ArticlePloS one2015
Delineating a New Heterothallic Species of Volvox (Volvocaceae, Chlorophyceae) Using New Strains of "Volvox africanus".
Article in PloS one, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 18 papers.
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18 citing papers in PubMed, 32 citations in OpenAlex.
- Whole-genome sequencing analysis of volvocine green algae reveals the molecular genetic basis for the diversity and evolution of sex.Proceedings of the Japan Academy. Series B, Physical and biological sciences · 2024Review
- Two species of the green algae Volvox sect. Volvox from the Japanese ancient lake, Lake Biwa.PloS one · 2024Article
- Expanded male sex-determining region conserved during the evolution of homothallism in the green algaiScience · 2023Article
- Morphology, mating system and taxonomy of Volvox africanus (Volvocaceae, Chlorophyceae) from Thailand.Botanical studies · 2022Article
- Three sex phenotypes in a haploid algal species give insights into the evolutionary transition to a self-compatible mating system.Evolution; international journal of organic evolution · 2021Article
- Phylotranscriptomics points to multiple independent origins of multicellularity and cellular differentiation in the volvocine algae.BMC biology · 2021Article
- Three genomes in the algal genusProceedings of the National Academy of Sciences of the United States of America · 2021Article
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- A new preferentially outcrossing monoicous species of Volvox sect. Volvox (Chlorophyta) from Thailand.PloS one · 2020Article
- Morphology, phylogeny, and taxonomy of two species of colonial volvocine green algae from Lake Victoria, Tanzania.PloS one · 2019Article
- Article
- Exploring the Limits and Causes of Plastid Genome Expansion in Volvocine Green Algae.Genome biology and evolution · 2018Article
- Morphology, taxonomy and mating-type loci in natural populations of Volvox carteri in Taiwan.Botanical studies · 2018Article
- Repeated evolution and reversibility of self-fertilization in the volvocine green algae.Evolution; international journal of organic evolution · 2018Article
- Article
- Origins of multicellular complexity: Volvox and the volvocine algae.Molecular ecology · 2016Article
- Article
- Rediscovery of the species of 'ancestralPhycologiaArticle
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Authors and funding
5 authors at 3 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The volvocine algae represent an excellent model lineage in which to study evolution of female and male genders based on comparative analyses of related species. Among these species, Volvox carteri has been extensively studied as a model of an oogamous and complex organism. However, it may have unique derived features that are not present in other species of Volvox. Therefore, information regarding the characteristics of sexual reproduction of other species of Volvox is also important. In 1971, Starr studied four types of sexuality in several global strains identified as Volvox africanus; however, further taxonomic studies of these strains have been lacking, and strains of three of the four sexual types are not available. Here, we studied the morphology, sexual reproduction, and taxonomy of two V. africanus-like species isolated recently from Lake Biwa, Japan. These two species were very similar to two sexual types described by Starr in 1971: one producing dioecious sexual spheroids in heterothallic strains and the other forming both male spheroids and monoecious spheroids in a single strain. The former species produced zygotes with a reticulate cell wall, whereas a smooth zygote wall was observed in the latter species as in V. africanus previously reported from various localities around the world. Our multigene phylogenetic analysis demonstrated that these are sister species to each other. However, the presence of a compensatory base change in the most conserved region of the secondary structure of nuclear ribosomal DNA internal transcribed spacer-2, hybrid inviability demonstrated by intercrossing experiments, and morphological differences in the density of abutment between the gelatinous material of adjacent cells (individual sheaths) in the spheroid supported the recognition of the two species, V. africanus having a smooth zygote wall and V. reticuliferus Nozaki sp. nov. having a reticulate zygote wall.
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