On the relationship between isoprene emission and photosynthetic metabolites under different environmental conditions |
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Authors: | Francesco Loreto Thomas D Sharkey |
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Institution: | (1) Department of Botany, University of Wisconsin, 53706-1381 Madison, WI, USA |
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Abstract: | Isoprene emission is related to photosynthesis but the nature of the relationship is not yet known. To explore this relationship
we have examined the rate of isoprene emission, photosynthesis, and the contents of photosynthetic metabolites in leaves of
velvet bean (Mucuna deeringeniana L.) and red oak (Quercus rubra L.) in response to a light-to-dark transition and to changes in air composition. Isoprene emission fell when darkness was
imposed and the drop was associated with reduced amounts of ribulose-1,5-bisphosphate and ATP. The rate of isoprene emission
and ATP content were reduced to the same extent by exposure to low O2 or high CO2 partial pressures. Only when O2 and CO2 were simultaneously removed from the air did the rate of isoprene emission drop without a corresponding change in ATP. The
results demonstrate that when carbon is not limiting, isoprene emission is highly correlated with ATP content. When synthesis
of phosphoglyceric acid is inhibited, however, carbon availability may control isoprene production.
Mr. Peter Vanderveer assisted with the measurements of enzymatic metabolites. Mr. Xavier Socias is gratefully acknowledged
for Rubisco preparation. This research was supported by the U.S. National Science Foundation, grant no. IBN 9105274. |
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Keywords: | ATP Carbon metabolism Isoprene Mucuna (isoprene emission) Phosphoglyceric acid Quercus (isoprene emission) |
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