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PLANT PHYSIOLOGY , Vol 101, Issue 2 435-440, Copyright © 1993 by American Society of Plant Biologists
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DEVELOPMENT AND GROWTH REGULATION |
Leaf Isoprene Emission Rate Is Dependent on Leaf Development and the Level of Isoprene Synthase
J. Kuzma and R. Fall
Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215
Isoprene (2-methyl-1,3-butadiene) is a major volatile hydrocarbon produced
by many plant species. Here we report that in velvet bean (Mucuna sp.),
isoprene emission is strongly dependent on leaf developmental state and
that changes in extractable isoprene synthase activity parallel isoprene
emission rates during leaf development. Both leaf emission and enzyme
activity exhibit over 100-fold increases from leaf emergence to leaf age 14
d and exhibit similar patterns to 23 d. This suggests that the enzyme,
isoprene synthase, is responsible for the in vivo production of isoprene
and that the level of the enzyme regulates the pattern of isoprene emission
in response to leaf development.
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