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Elsevier, Atmospheric Environment, 36(38), p. 6149-6156

DOI: 10.1016/j.atmosenv.2004.07.028

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Effect of drought on isoprene emission rates from leaves of Quercus virginiana Mill.

Journal article published in 2004 by E. Pegoraro, A. Rey ORCID, J. Greenberg, P. Harley, J. Grace, Y. Malhi, A. Guenther
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

Leaf isoprene emission rates (Fiso) were studied in 2-year old trees of live oak (Quercus virginiana Mill.) during two drying–rewatering cycles. During the first drying–rewatering cycle, photosynthesis (A) and stomatal conductance (gs) decreased by 92%(±7%) and 91%(±8%), respectively, while Fiso remained essentially constant for 8 days of treatment. After 12 days under severe drought conditions, Fiso was reduced by 64%(±6%). Similar values were found during the second drying–rewatering cycle. During the recovery phase of both cycles, Fiso recovered more quickly than A and gs. The lower drought sensitivity of Fiso compared with that of A resulted in a higher percentage of fixed C lost as isoprene (Ciso/CA) as plants became more stressed, reaching peaks of 50% when A was almost zero. Fiso showed a strong negative linear relationship with pre-dawn leaf water potential (ψPD) that could be a useful parameter to include in isoprene emission models to account for effects of drought stress on leaf Fiso.