Ecophysiology of constitutive and facultative CAM photosynthesis

Journal of Experimental Botany
Klaus Winter

Abstract

In plants exhibiting crassulacean acid metabolism (CAM), CAM photosynthesis almost always occurs together with C3 photosynthesis, and occasionally with C4 photosynthesis. Depending on species, ontogeny, and environment, CAM input to total carbon gain can vary from values of <1% to 100%. The wide range of CAM phenotypes between and within species is a fascinating example of functional diversity and plasticity, but poses a significant challenge when attempting to define CAM. CO2 gas exchange experiments designed for this review illustrate key patterns of CAM expression and highlight distinguishing features of constitutive and facultative CAM. Furthermore, they help to address frequently recurring questions on CAM terminology. The functional and evolutionary significance of contrasting CAM phenotypes and of intermediate states between extremes is discussed. Results from a study on nocturnal malate accumulation in 50 species of Aizoaceae exposed to drought and salinity stress suggest that facultative CAM is more widespread amongst vascular plants than previously thought.

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Citations

Mar 2, 2019·Journal of Experimental Botany·Klaus WinterJoseph A M Holtum
Jan 17, 2020·The Plant Journal : for Cell and Molecular Biology·Methawi Chomthong, Howard Griffiths
Mar 14, 2020·Annals of Botany·Karolina HeydukJim Leebens-Mack
Jul 18, 2020·Plant, Cell & Environment·Marylaure De La HarpeChristian Lexer
Jul 21, 2020·Journal of Experimental Botany·Pierre-Nicolas Boulc'hIvan Couée
Nov 30, 2019·Journal of Experimental Botany·Kevin R HultineDavid G Williams
Aug 30, 2020·Scientific Reports·Renata Callegari FerrariLuciano Freschi
Feb 4, 2021·The New Phytologist·Andreas H SchweigerSteven I Higgins
Apr 27, 2021·Functional Plant Biology : FPB·Joseph A M HoltumKlaus Winter
Sep 14, 2020·Functional Plant Biology : FPB·Klaus WinterJoseph A M Holtum
Dec 2, 2020·Functional Plant Biology : FPB·Renata Callegari FerrariLuciano Freschi
Dec 9, 2020·Functional Plant Biology : FPB·Klaus WinterJ Andrew C Smith
Oct 13, 2021·The New Phytologist·Klaus Winter, J Andrew C Smith

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