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. 2013 Feb 1;64(6):1497–1507. doi: 10.1093/jxb/ert010

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© The Author(2) [2013].

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by-nc/3.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com.

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Fig. 5. — Hypothetical model of daytime metabolite fluxes in starch-storing CAM species such as Mesembryanthemum crystallinum, K. pinnata and S. spectabile (based on Silvera et al., 2010; Holtum et al., 2005). Dotted arrows represent multiple steps. Free sedoheptulose formation under elevated CO₂ in K. pinnata is indicated and originates from the action of a sedoheptulose-7-phosphate phosphatase acting on the oxPPP intermediate sedoheptulose-7-phosphate. A negative feedback control by ADP and P_i is proposed, contributing to both C and P homeostasis. Glc6P, glucose-6-phosphate; PGA, 3-phosphoglycerate; PEP, phosphoenolpyruvate; Pyr, pyruvate; Sedo, sedoheptulose; Sedo-7-P, sedoheptulose-7-phosphate; Suc, sucrose; TP, triose phosphate. (This figure is available in colour at JXB online.)