Plant Physiology 88:850-853 (1988)
© 1988 American Society of Plant Biologists
Metabolism and Enzymology
Effects of Irradiance and Methyl Viologen Treatment on ATP, ADP, and Activation of Ribulose Bisphosphate Carboxylase in Spinach Leaves 1
Anna Brooks,
Archie R. Portis, Jr. and
Thomas D. Sharkey
Department of Agronomy, University of Illinois at Urbana-Champaign, S-215 Turner Hall, Urbana, Illinois 61801,
United States Department of Agriculture/Agricultural Research Service, University of Illinois at Urbana-Champaign, S-215 Turner Hall, Urbana, Illinois 61801,
Department of Botany, University of Wisconsin, Madison, Wisconsin 53706
Since activation of ribulose bisphosphate carboxylase (rubisco) by rubisco activase is sensitive to ATP and ADP in vitro, we aimed to test the correlation between ATP level and rubisco activation state in intact leaves of Spinacia oleracea L. in response to changes in irradiance and after feeding the electron acceptor methyl viologen. Leaves were exposed to various irradiances for 45 minutes at atmospheric partial pressures of CO2 and O2. After measuring the rate of CO2 assimilation, leaves were freeze-clamped in situ and the punched discs assayed for rubisco activity, and amounts of ribulose bisphosphate (RuBP), ATP, and ADP. The photosynthetic rate and the activation state of rubisco increased with increasing irradiance but the levels of RuBP, ATP, and ADP were not greatly affected. Methyl viologen fed leaves under low irradiance had rubisco activation states of 93% compared to 51% in control leaves. The ATP content of the leaves was also significantly higher and the ratio of ATP to ADP was 4.1 in methyl viologen fed leaves compared to 2.2 in control leaves. From these results and other published results we conclude that a correlation between ATP level and rubisco activation can be observed in intact leaves, but that during changes in irradiance some additional factors are involved in regulating rubisco activation.
1 Funded in part by a United States Department of Agriculture grant No. 86-CRCR-1-2017 to A. R. P. and Department of Energy grant No. DE FG02-87ER 13785 to T. D. S.
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