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Production of Isoprene by Leaf Tissue ¹

^a Department of Botany and Air Pollution Research Section, College of Engineering Research Division, Washington State University, Pullman, Washington 99163

Isoprene production by Hamamelis virginiana L. and Quercus borealis Michx. leaves was studied. When ambient CO₂ concentrations were maintained with bicarbonate buffers, the rate of isoprene production at 125 microliters per liter of CO₂ was approximately four times that at 250 microliters per liter of CO₂. Isoprene production was drastically inhibited by 97% O₂. Dichlorodimethylphenylurea (0.1 mM), NaHSO₃ (10 mM), and -hydroxy-2-pyridinemethanesulfonic acid (10 mM) inhibited isoprene production but increased the compensation point of the tissue. Isonicotinic acid hydrazide neither inhibited isoprene emission nor increased the compensation point of the tissue significantly. Inhibition of isoprene production does not seem to correlate with stomatal resistance. Isoprene was labeled by intermediates of the glycolate pathway, and similarities are noted between the biosynthesis of isoprene and that of -carotene.

¹ This research was supported in part by a National Defense Education Act Title IV Fellowship 71-002943 awarded to C. A. J. and in part by the Environmental Protection Agency Grant AP 01115 awarded to R. A. R.

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