This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via CrossRef Citing Articles via Web of Science (89) Citing Articles via Google Scholar Google Scholar Articles by Kirschbaum, M. U. F. Articles by Pearcy, R. W. Search for Related Content PubMed PubMed Citation Articles by Kirschbaum, M. U. F. Articles by Pearcy, R. W. Agricola Articles by Kirschbaum, M. U. F. Articles by Pearcy, R. W.

Environmental and Stress Physiology

Gas Exchange Analysis of the Relative Importance of Stomatal and Biochemical Factors in Photosynthetic Induction in Alocasia macrorrhiza¹

Department of Botany, University of California, Davis, California 95616

When leaves of Alocasia macrorrhiza adapted to 10 micromole quanta per square meter per second were transferred to 500 micromole quanta per square meter per second, the rate of photosynthetic CO₂ assimilation increased for over 45 minutes. For the first 10 to 15 minutes, increases in both stomatal conductance and the leaf's photosynthetic capacity were responsible for the increase in assimilation rate. Thereafter, continuing increases in stomatal conductance were almost entirely responsible for further increases in assimilation rate. When conductances were initially high, assimilation rates 1 minute after the increase in photon flux density could be more than six times as high as for similar leaves with initially low conductance. Further increases in assimilation rate in these leaves with high conductance were predominantly due to increases in the induction state at the biochemical level and followed an exponential time course. When stomatal conductances were initially low, then increases in conductance were predominantly responsible for the increases in assimilation rate, with both following a sigmoidal time course. In these leaves, it was important to also consider the effect of cuticular water loss on the calculation of the intracellular partial pressure of CO₂, and an assessment of the relative importance of stomatal conductance differed considerably from one that did not include cuticular water loss.

This article has been cited by other articles:

				S. Ennahli and H. J. Earl Physiological Limitations to Photosynthetic Carbon Assimilation in Cotton under Water Stress Crop Sci., September 23, 2005; 45(6): 2374 - 2382. [Abstract] [Full Text] [PDF]

				A. Makino, C. Miyake, and A. Yokota Physiological Functions of the Water-Water Cycle (Mehler Reaction) and the Cyclic Electron Flow around PSI in Rice Leaves Plant Cell Physiol., September 15, 2002; 43(9): 1017 - 1026. [Abstract] [Full Text] [PDF]

				H. Kaiser and L. Kappen In situ observation of stomatal movements and gas exchange of Aegopodium podagraria L. in the understorey J. Exp. Bot., October 1, 2000; 51(351): 1741 - 1749. [Abstract] [Full Text] [PDF]