Crassulacean acid metabolism in the Basellaceae (Caryophyllales)

Holtum, J.A.M., Hancock, L.P., Edwards, E.J., and Winter, K. (2018) Crassulacean acid metabolism in the Basellaceae (Caryophyllales). Plant Biology, 20 (3). pp. 409-414.

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Abstract

C4 and crassulacean acid metabolism (CAM) have evolved in the order Caryophyllales many times but neither C4 nor CAM have been recorded for the Basellaceae, a small family in the CAM‐rich sub‐order Portulacineae.

24 h gas exchange and day–night changes in titratable acidity were measured in leaves of Anredera baselloides exposed to wet–dry–wet cycles.

While net CO2 uptake was restricted to the light period in well‐watered plants, net CO2 fixation in the dark, accompanied by significant nocturnal increases in leaf acidity, developed in droughted plants. Plants reverted to solely C3 photosynthesis upon rewatering.

The reversible induction of nocturnal net CO2 uptake by drought stress indicates that this species is able to exhibit CAM in a facultative manner. This is the first report of CAM in a member of the Basellaceae.

Item ID: 53406
Item Type: Article (Research - C1)
ISSN: 1438-8677
Keywords: Anredera baselloides, C-4 photosynthesis, Caryophyllales, facultative CAM, portullugo
Copyright Information: © 2018 German Society for Plant Sciences and The Royal Botanical Society of the Netherlands
Funders: Australian Research Council (ARC), U.S. National Science Foundation (NSF), Integrative Graduate Education and Research Traineeship (IGERT)
Projects and Grants: ARC Discovery Project DP160100098, NSF grant DEB‐1252901, NSF grant GR‐5260110, IGERT grant DGE‐11 0966060
Date Deposited: 03 May 2018 12:00
FoR Codes: 06 BIOLOGICAL SCIENCES > 0607 Plant Biology > 060705 Plant Physiology @ 100%
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