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Moderately High Temperatures Inhibit Ribulose-1,5-Bisphosphate Carboxylase/Oxygenase (Rubisco) Activase-Mediated Activation of Rubisco1

Urs Feller, Steven J. Crafts-Brandner*, and Michael E. Salvucci

Institute of Plant Physiology, University of Bern, Altenbergrain 21, CH-3013 Bern, Switzerland (U.F.); and United States Department of Agriculture-Agricultural Research Service Western Cotton Research Laboratory, 4135 East Broadway Road, Phoenix, Arizona 85040-8830 (S.J.C.-B., M.E.S.)

We tested the hypothesis that light activation of ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) is inhibited by moderately elevated temperature through an effect on Rubisco activase. When cotton (Gossypium hirsutum L.) or wheat (Triticum aestivum L.) leaf tissue was exposed to increasing temperatures in the light, activation of Rubisco was inhibited above 35 and 30°C, respectively, and the relative inhibition was greater for wheat than for cotton. The temperature-induced inhibition of Rubisco activation was fully reversible at temperatures below 40°C. In contrast to activation state, total Rubisco activity was not affected by temperatures as high as 45°C. Nonphotochemical fluorescence quenching increased at temperatures that inhibited Rubisco activation, consistent with inhibition of Calvin cycle activity. Initial and maximal chlorophyll fluorescence were not significantly altered until temperatures exceeded 40°C. Thus, electron transport, as measured by Chl fluorescence, appeared to be more stable to moderately elevated temperatures than Rubisco activation. Western-blot analysis revealed the formation of high-molecular-weight aggregates of activase at temperatures above 40°C for both wheat and cotton when inhibition of Rubisco activation was irreversible. Physical perturbation of other soluble stromal enzymes, including Rubisco, phosphoribulokinase, and glutamine synthetase, was not detected at the elevated temperatures. Our evidence indicates that moderately elevated temperatures inhibit light activation of Rubisco via a direct effect on Rubisco activase.

1   This work was supported in part by a grant from the Swiss National Science Foundation (project no. 3100-043174.95).
*   Corresponding author; e-mail crafts{at}ix.netcom.com; fax 1-602-379-4509.

Plant Physiol. (1998) 116: 539-546
Copyright Clearance Center:   0032-0889/98/116/0539/08
© 1998 American Society of Plant Physiologists




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