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Longitudinal study of Caribbean pine elucidates the role of 4-allylanisole in patterns of chemical resistance to bark beetle attack

Published online by Cambridge University Press:  20 January 2020

Austin J. Hammer
Affiliation:
Chemistry and Biochemistry, Colorado College, Colorado Springs, CO, 80903, USA
Nathan W. Bower*
Affiliation:
Chemistry and Biochemistry, Colorado College, Colorado Springs, CO, 80903, USA
Aaron I. Snyder
Affiliation:
Chemistry and Biochemistry, Colorado College, Colorado Springs, CO, 80903, USA
Zachary N. Snyder
Affiliation:
Chemistry and Biochemistry, Colorado College, Colorado Springs, CO, 80903, USA
Fredy L. Archila
Affiliation:
Herbario BIGU, Universidad de San Carlos de Guatemala, Guatemala, 01012
Marc A. Snyder*
Affiliation:
Organismal Biology and Ecology, Colorado College, Colorado Springs, CO, 80903, USA
*
Authors for correspondence: *Nathan W. Bower, Email: [email protected]; Marc A. Snyder, Email: [email protected]
Authors for correspondence: *Nathan W. Bower, Email: [email protected]; Marc A. Snyder, Email: [email protected]

Abstract

Southern pine beetles (Dendroctonus frontalis Zimmermann) and symbiotic fungi are associated with mass mortality in stands of Caribbean pine (Pinus caribaea Morelet). This study provides a 12.7-year assessment of semiochemical mediation between southern pine beetle and Caribbean pine in relation to concentrations of 4-allylanisole (estragole, methyl chavicol) and monoterpenes measured by gas chromatography–mass spectrometry in different seasons in premontane and coastal pine stands of Belize and Guatemala. Individual trees and stands with >2.5% (relative mass %) of 4-allylanisole in the xylem oleoresin exhibited significantly less beetle-induced mortality than those with <2.5%. Changes in relative levels of 4-allylanisole and monoterpenes during this study are consistent with seasonal temperature and cumulative water deficit effects and suggest bark beetle attack of P. caribaea may intensify in the future.

Type
Research Article
Copyright
© The Author(s) 2020. Published by Cambridge University Press

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