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Citation for Study 18363

Citation title: "Delineating a New Heterothallic Species of Volvox (Volvocales, Chlorophyceae) Using New Strains of "Volvox africanus"".

Study name: "Delineating a New Heterothallic Species of Volvox (Volvocales, Chlorophyceae) Using New Strains of "Volvox africanus"".

This study is part of submission 18363 (Status: Published).

Citation

Nozaki H., Matsuzaki R., Yamamoto K., Kawachi M., & Takahashi F. 2015. Delineating a New Heterothallic Species of Volvox (Volvocales, Chlorophyceae) Using New Strains of "Volvox africanus". PLoS ONE, 10(11): e0142632.

Authors

• Nozaki H. +81-3-5841-4048
• Matsuzaki R. (submitter) +81-29-850-2204
• Yamamoto K.
• Kawachi M.
• Takahashi F.

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 Volvox species. 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 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.

External links

• DOI: 10.1371/journal.pone.0142632
• PMID: 26562165
• Other URL: http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0142632

About this resource

• Canonical resource URI: http://purl.org/phylo/treebase/phylows/study/TB2:S18363
• Other versions: Nexus NeXML
• Show BibTeX reference

  		@ARTICLE{TreeBASE2Ref25173,
  	 author = {Hisayoshi  Nozaki and Ryo  Matsuzaki and Kayoko  Yamamoto and Masanobu  Kawachi and Fumio  Takahashi},
  	 title = {Delineating a New Heterothallic Species of Volvox (Volvocales, Chlorophyceae) Using New Strains of "Volvox africanus"},
  	 year = {2015},
  	 keywords = {},
  	 doi = {10.1371/journal.pone.0142632},
  	 url = {http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0142632},
  	 pmid = {26562165},
  	 journal = {PLoS ONE},
  	 volume = {10},
  	 number = {11},
  	 pages = {e0142632},
  	 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 Volvox species. 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 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.}
  }
  		

• Show RIS reference

  		TY  - JOUR
  ID  - 25173
  AU  - Nozaki,Hisayoshi 
  AU  - Matsuzaki,Ryo 
  AU  - Yamamoto,Kayoko 
  AU  - Kawachi,Masanobu 
  AU  - Takahashi,Fumio 
  T1  - Delineating a New Heterothallic Species of Volvox (Volvocales, Chlorophyceae) Using New Strains of "Volvox africanus"
  PY  - 2015
  KW  - 
  UR  - http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0142632
  N2  - 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 Volvox species. 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 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.
  L3  - 10.1371/journal.pone.0142632
  JF  - PLoS ONE
  VL  - 10
  IS  - 11
  ER  -