Distribution of crassulacean acid metabolism in orchids of Panama: evidence of selection for weak and strong modes

Functional Plant Biology : FPB
Katia SilveraKlaus Winter

Abstract

Crassulacean acid metabolism (CAM) is one of three metabolic pathways found in vascular plants for the assimilation of carbon dioxide. In this study, we investigate the occurrence of CAM photosynthesis in 200 native orchid species from Panama and 14 non-native species by carbon isotopic composition (δ13C) and compare these values with nocturnal acid accumulation measured by titration in 173 species. Foliar δ13C showed a bimodal distribution with the majority of species exhibiting values of approximately -28‰ (typically associated with the C3 pathway), or -15‰ (strong CAM). Although thick leaves were related to δ13C values in the CAM range, some thin-leaved orchids were capable of CAM photosynthesis, as demonstrated by acid titration. We also found species with C3 isotopic values and significant acid accumulation at night. Of 128 species with δ13C more negative than -22‰, 42 species showed nocturnal acid accumulation per unit fresh mass characteristic of weakly expressed CAM. These data suggest that among CAM orchids, there may be preferential selection for species to exhibit strong CAM or weak CAM, rather than intermediate metabolism.

References

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Citations

Apr 28, 2009·Journal of Experimental Botany·Anne M BorlandJ Andrew C Smith
Sep 24, 2010·Journal of Experimental Botany·Johan CeustersMaurice P De Proft
Jan 1, 2016·Journal of Experimental Botany·Karolina HeydukJim Leebens-Mack
May 11, 2018·American Journal of Botany·Karolina HeydukJames Leebens-Mack
Apr 19, 2013·AoB Plants·Ana Herrera
May 16, 2015·The New Phytologist·Klaus WinterJ Andrew C Smith
Oct 11, 2014·Evolution; International Journal of Organic Evolution·James W HornKenneth J Wurdack
Feb 28, 2019·Journal of Experimental Botany·Klaus Winter
Mar 14, 2009·The New Phytologist·Casandra Reyes-García, José Luis Andrade
Mar 20, 2019·Nature Reviews. Genetics·Karolina HeydukErika J Edwards
Oct 16, 2013·Journal of Experimental Botany·Brad S RipleyMichael D Cramer
Mar 24, 2012·Photosynthesis Research·Edward W J Tsen, Joseph A M Holtum
Mar 19, 2014·Journal of Experimental Botany·Pascal-Antoine ChristinErika J Edwards
Aug 2, 2013·The New Phytologist·Lucas A CernusakGraham D Farquhar
Jan 24, 2020·BMC Evolutionary Biology·Carmen Hermida-CarreraJeroni Galmés
Jul 1, 2005·Functional Plant Biology : FPB·John C Cushman
Mar 14, 2020·Annals of Botany·Karolina HeydukJim Leebens-Mack
Jul 1, 2015·Functional Plant Biology : FPB·Klaus Winter, Joseph A M Holtum
Dec 6, 2020·Biology·Robert J HenryParimalan Rangan
Jul 10, 2019·Current Opinion in Plant Biology·Nicholas A NiechayevJohn C Cushman
Sep 4, 2016·Molecular Phylogenetics and Evolution·Karolina HeydukJames Leebens-Mack
Oct 1, 2007·American Journal of Botany·Joseph A M HoltumTimothy R Sexton

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