Variability of the pyrenoid-based CO2 concentrating mechanism in hornworts (Anthocerotophyta)

Functional Plant Biology : FPB
David T HansonMurray R Badger

Abstract

Hornworts (Anthocerotophyta) are the only group of land plants with pyrenoid-containing chloroplasts. CO2 exchange and carbon isotope discrimination values (Δ13C) values have previously demonstrated the presence of a CO2 concentrating mechanism (CCM) in some pyrenoid-containing species. We have examined hornwort CCM function by using a combined fluorometer/mass spectrometer based technique to compare pyrenoid-containing (PhaeocerosProsk. and Notothylas Sull.) and pyrenoid-lacking (Megaceros Campbell) hornworts, with the liverwort Marchantia polymorphaL. that has standard C3 photosynthesis and a thalloid growth form similar to hornworts. We found that Notothylas has more CCM activity than Phaeoceros, and that Megaceros has the least CCM activity. Notothylas and Phaeoceros had compensation points from 11-13 parts per million (ppm) CO2, lower K0.5(CO2) than Marchantia, negligible photorespiration, and they accumulate a pool of dissolved inorganic carbon (DIC) between 19-108 nmol mg-1 chlorophyll. Megaceroshad an intermediate compensation point of 31 ppm CO2 (compared with 64 ppm CO2 in Marchantia), a lower K0.5(CO2) than Marchantia, and some photorespiration, but no DIC pool. We also determined the catalytic rate of carboxylation ...Continue Reading

Citations

May 16, 2017·Journal of Experimental Botany·John A RavenPatricia Sánchez-Baracaldo
Oct 1, 2004·American Journal of Botany·Jonathan Shaw, Karen Renzaglia
Dec 4, 2012·Plant Biology·M HagemannA P M Weber
Jun 6, 2017·Journal of Experimental Botany·Ana M C HeureuxRosalind E M Rickaby
May 20, 2008·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Moritz MeyerHoward Griffiths
Nov 2, 2012·Proceedings of the National Academy of Sciences of the United States of America·Juan Carlos Villarreal, Susanne S Renner

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