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Citation for Study 13448

Citation title: "Hornwort pyrenoids: carbon-concentrating mechanisms evolved and were lost at least five times during the last 100 million years".

Study name: "Hornwort pyrenoids: carbon-concentrating mechanisms evolved and were lost at least five times during the last 100 million years".

This study is part of submission 13448 (Status: Published).

Citation

Villarreal J.C., & Renner S.S. 2013. Hornwort pyrenoids: carbon-concentrating mechanisms evolved and were lost at least five times during the last 100 million years. Proceedings of the National Academy of Sciences U.S.A., .

Authors

• Villarreal J.C. (submitter) 49+ 01628437810
• Renner S.S. 011-49-(0)89-17861250

Abstract

RuBisCO has a crucial role in carbon fixation but a slow catalytic rate, a problem overcome in some plant lineages by physiological and anatomical traits that elevate carbon concentrations around the enzyme. Such carbon-concentrating mechanisms (CCMs) are hypothesized to have evolved during periods of low atmospheric CO2. Hornworts, the sister to vascular plants, have a CCM that relies on pyrenoids, proteinaceous bodies mostly consisting of RuBisCO. We generated a phylogeny based on mitochondrial and plastid sequences for 36% of the c. 200 hornwort species to infer the history of gains and losses of pyrenoids in this clade; we also used fossils and multiple dating approaches to generate a chronogram for the hornworts. The results imply 5-6 origins and an equal number of subsequent losses of pyrenoids in hornworts, with the oldest pyrenoid gained ca. 100 mya, and most others at <35 mya. The non-synchronous appearance of pyrenoid-containing clades, the successful diversification of pyrenoid-lacking clades during periods with low CO2, and the maintenance of pyrenoids during episodes of high [CO2] all argue against the previously proposed relationship between pyrenoid origin and low [CO2]. The selective advantages, and costs, of hornwort pyrenoids thus must relate to additional factors besides atmospheric CO2.

Keywords

hornwort, pyrenoid, carbon concentrating mechanisms, CO2

External links

About this resource

• Canonical resource URI: http://purl.org/phylo/treebase/phylows/study/TB2:S13448
• Other versions: Nexus NeXML
• Show BibTeX reference

  		@ARTICLE{TreeBASE2Ref21403,
  	 author = {Juan Carlos Villarreal and Susanne S Renner},
  	 title = {Hornwort pyrenoids: carbon-concentrating mechanisms evolved and were lost at least five times during the last 100 million years},
  	 year = {2013},
  	 keywords = {hornwort, pyrenoid, carbon concentrating mechanisms, CO2},
  	 doi = {},
  	 url = {http://},
  	 pmid = {},
  	 journal = {Proceedings of the National Academy of Sciences U.S.A.},
  	 volume = {},
  	 number = {},
  	 pages = {},
  	 abstract = {RuBisCO has a crucial role in carbon fixation but a slow catalytic rate, a problem overcome in some plant lineages by physiological and anatomical traits that elevate carbon concentrations around the enzyme. Such carbon-concentrating mechanisms (CCMs) are hypothesized to have evolved during periods of low atmospheric CO2. Hornworts, the sister to vascular plants, have a CCM that relies on pyrenoids, proteinaceous bodies mostly consisting of RuBisCO. We generated a phylogeny based on mitochondrial and plastid sequences for 36% of the c. 200 hornwort species to infer the history of gains and losses of pyrenoids in this clade; we also used fossils and multiple dating approaches to generate a chronogram for the hornworts. 
  The results imply 5-6 origins and an equal number of subsequent losses of pyrenoids in hornworts, with the oldest pyrenoid gained ca. 100 mya, and most others at <35 mya. The non-synchronous appearance of pyrenoid-containing clades, the successful diversification of pyrenoid-lacking clades during periods with low CO2, and the maintenance of pyrenoids during episodes of high [CO2] all argue against the previously proposed relationship between pyrenoid origin and low [CO2]. The selective advantages, and costs, of hornwort pyrenoids thus must relate to additional factors besides atmospheric CO2.
  }
  }
  		

• Show RIS reference

  		TY  - JOUR
  ID  - 21403
  AU  - Villarreal,Juan Carlos
  AU  - Renner,Susanne S
  T1  - Hornwort pyrenoids: carbon-concentrating mechanisms evolved and were lost at least five times during the last 100 million years
  PY  - 2013
  KW  - hornwort
  KW  - pyrenoid
  KW  - carbon concentrating mechanisms
  KW  - CO2
  UR  - http://dx.doi.org/
  N2  - RuBisCO has a crucial role in carbon fixation but a slow catalytic rate, a problem overcome in some plant lineages by physiological and anatomical traits that elevate carbon concentrations around the enzyme. Such carbon-concentrating mechanisms (CCMs) are hypothesized to have evolved during periods of low atmospheric CO2. Hornworts, the sister to vascular plants, have a CCM that relies on pyrenoids, proteinaceous bodies mostly consisting of RuBisCO. We generated a phylogeny based on mitochondrial and plastid sequences for 36% of the c. 200 hornwort species to infer the history of gains and losses of pyrenoids in this clade; we also used fossils and multiple dating approaches to generate a chronogram for the hornworts. 
  The results imply 5-6 origins and an equal number of subsequent losses of pyrenoids in hornworts, with the oldest pyrenoid gained ca. 100 mya, and most others at <35 mya. The non-synchronous appearance of pyrenoid-containing clades, the successful diversification of pyrenoid-lacking clades during periods with low CO2, and the maintenance of pyrenoids during episodes of high [CO2] all argue against the previously proposed relationship between pyrenoid origin and low [CO2]. The selective advantages, and costs, of hornwort pyrenoids thus must relate to additional factors besides atmospheric CO2.
  
  L3  - 
  JF  - Proceedings of the National Academy of Sciences U.S.A.
  VL  - 
  IS  - 
  ER  -