Ecophysiology of constitutive and facultative CAM photosynthesis.
Hatiora
Kalanchoe
Portulaca
Acidity
carbon assimilation
evolution
facultative CAM
ontogeny
photosynthesis
photosynthetic intermediate
Journal
Journal of experimental botany
ISSN: 1460-2431
Titre abrégé: J Exp Bot
Pays: England
ID NLM: 9882906
Informations de publication
Date de publication:
29 11 2019
29 11 2019
Historique:
received:
24
08
2018
accepted:
08
01
2019
pubmed:
28
2
2019
medline:
13
8
2020
entrez:
28
2
2019
Statut:
ppublish
Résumé
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.
Identifiants
pubmed: 30810162
pii: 5365843
doi: 10.1093/jxb/erz002
doi:
Substances chimiques
Carboxylic Acids
0
Carbon Dioxide
142M471B3J
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Review
Langues
eng
Sous-ensembles de citation
IM
Pagination
6495-6508Informations de copyright
Published by Oxford University Press on behalf of the Society for Experimental Biology 2019.