Department of Botany, Duke University, Durham, NC 27708-0340, USA.
Scaling sun and shade photosynthetic acclimation of Alocasia macrorrhiza to whole-plant performance – II. Simulation of carbon balance and growth at different photon flux densities
Article first published online: 28 APR 2006
Plant, Cell & Environment
Volume 17, Issue 8, pages 889–900, August 1994
How to Cite
SIMS, D.A., GEBAUER, R.L.E. and PEARCY, R.W. (1994), Scaling sun and shade photosynthetic acclimation of Alocasia macrorrhiza to whole-plant performance – II. Simulation of carbon balance and growth at different photon flux densities. Plant, Cell & Environment, 17: 889–900. doi: 10.1111/j.1365-3040.1994.tb00318.x
- Issue published online: 28 APR 2006
- Article first published online: 28 APR 2006
- Received 1 November 1993; received in revised form 4 January 1994; accepted for publication 18 January 1994.
- Alocasia macrorrhiza;
- cost/benefit analysis;
- light acclimation;
A whole-plant carbon balance model incorporating a light acclimation response was developed for Alocasia macrorrhiza based on empirical data and the current understanding of light acclimation in this species. The model was used to predict the relative growth rate (RGR) for plants that acclimated to photon flux density (PFD) by changing their leaf type, and for plants that produced only sun or shade leaves regardless of PFD. The predicted RGR was substantially higher for plants with shade leaves than for those with sun leaves at low PFD. However, the predicted RGR was not higher, and in fact was slightly lower, for plants with sun leaves than for those with shade leaves at high PFD. The decreased leaf area ratios (LARs) of the plants with sun leaves counteracted their higher photosynthetic capacities per unit leaf area (Amax). The model was manipulated by changing parameters to examine the sensitivity of RGR to variation in single factors. Overall, RGR was most sensitive to LAR and showed relatively little sensitivity to variation in Amax or maintenance respiration. Similarly, RGR was relatively insensitive to increases in leaf life-span beyond those observed. Respiration affected RGR only at low PFD, whereas Amax was moderately important only at high PFD.