Crassulacean acid metabolism and fitness under water deficit stress: if not for carbon gain, what is facultative CAM good for?

Annals of Botany
Ana Herrera

Abstract

In obligate Crassulacean acid metabolism (CAM), up to 99 % of CO(2) assimilation occurs during the night, therefore supporting the hypothesis that CAM is adaptive because it allows CO(2) fixation during the part of the day with lower evaporative demand, making life in water-limited environments possible. By comparison, in facultative CAM (inducible CAM, C(3)-CAM) and CAM-cycling plants drought-induced dark CO(2) fixation may only be, with few exceptions, a small proportion of C(3) CO(2) assimilation in watered plants and occur during a few days. From the viewpoint of survival the adaptive advantages, i.e. increased fitness, of facultative CAM and CAM-cycling are not obvious. Therefore, it is hypothesized that, if it is to increase fitness, CAM must aid in reproduction. Scope An examination of published reports of 23 facultative CAM and CAM-cycling species finds that, in 19 species, drought-induced dark CO(2) fixation represents on average 11 % of C(3) CO(2) assimilation of watered plants. Evidence is discussed on the impact of the operation of CAM in facultative and CAM-cycling plants on their survival--carbon balance, water conservation, water absorption, photo-protection of the photosynthetic apparatus--and reproductive effor...Continue Reading

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Citations

Apr 19, 2013·AoB Plants·Ana Herrera
Oct 16, 2013·Journal of Experimental Botany·Brad S RipleyMichael D Cramer
Oct 31, 2015·International Journal of Molecular Sciences·Nele WeyensStanislaw W Gawronski
Oct 11, 2014·Evolution; International Journal of Organic Evolution·James W HornKenneth J Wurdack
Apr 4, 2017·Journal of Experimental Botany·Hui ShaoWen Min Huang
Feb 28, 2019·Journal of Experimental Botany·Klaus Winter
Feb 26, 2019·3 Biotech·Paola Isabel Angulo-BejaranoOctavio Paredes-López
May 16, 2015·The New Phytologist·Klaus WinterJ Andrew C Smith
Mar 14, 2020·Annals of Botany·Karolina HeydukJim Leebens-Mack
May 14, 2010·Integrative Cancer Therapies·Ilona JuraskovaPenelope Schofield
Aug 30, 2020·Scientific Reports·Renata Callegari FerrariLuciano Freschi
Feb 11, 2009·Annals of Botany·David W Lawlor
Jul 1, 2015·Functional Plant Biology : FPB·Klaus Winter, Joseph A M Holtum
Jul 10, 2019·Current Opinion in Plant Biology·Nicholas A NiechayevJohn C Cushman
Apr 14, 2021·Annual Review of Plant Biology·Katharina Schiller, Andrea Bräutigam

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