Cryptic crassulacean acid metabolism (CAM) in Jatropha curcas
Klaus Winter A C and Joseph A. M. Holtum A B
+ Author Affiliations
- Author Affiliations
A Smithsonian Tropical Research Institute, PO Box 0843-03092, Balboa, Ancón, Republic of Panama.
B Centre for Tropical Biodiversity and Climate Change, James Cook University, Townsville, Qld 4811, Australia.
C Corresponding author. Email: winterk@si.edu
Functional Plant Biology 42(8) 711-717 https://doi.org/10.1071/FP15021
Submitted: 30 January 2015 Accepted: 13 April 2015 Published: 25 May 2015
Abstract
Jatropha curcas L. is a drought-tolerant shrub or small tree that is a candidate bioenergy feedstock. It is a member of the family Euphorbiaceae in which both CAM and C4 photosynthesis have evolved. Here, we report that J. curcas exhibits features diagnostic of low-level CAM. Small increases in nocturnal acid content were consistently observed in photosynthetic stems and occasionally in leaves. Acidification was associated with transient contractions in CO2 loss at night rather than with net CO2 dark fixation. Although the CAM-type nocturnal CO2 uptake signal was masked by background respiration, estimates of dark CO2 fixation based upon the 2 : 1 stoichiometric relationship between H+ accumulated and CO2 fixed indicated substantial carbon retention in the stems via the CAM cycle. It is proposed that under conditions of drought, low-level CAM in J. curcas stems serves primarily to conserve carbon rather than water.
Additional keywords: biofuel, Euphorbiaceae, photosynthesis, stem respiration.
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