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Environmental and Stress Physiology

Delayed Onset of Isoprene Emission in Developing Velvet Bean (Mucuna sp.) Leaves ¹

Department of Chemistry and Biochemistry, Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado 80309-0215, Department of Environmental, Population, and Organismic Biology, Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado 80309-0215

Isoprene (2-methyl-1,3-butadiene) is one of the major volatile hydrocarbons emitted by plants, but its biosynthetic pathway and role in plant metabolism are unknown. Mucuna sp. (velvet bean) is an isoprene emitter, and leaf isoprene emission rate increased as much as 125-fold as leaves developed, and declined in older leaves. Net CO₂ assimilation and stomatal conductance, under different growth and environmental conditions, increased 3 to 5 days prior to an increase in isoprene emission rate, indicating that photosynthetic competence develops before significant isoprene emission occurs.

¹ This work was supported by National Science Foundation grants ATM-8719536 and ATM-9007849, and Environmental Protection Agency grant R-815995.

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