Cambios en metabolitos secundarios de pinos en respuesta a la larva de procesionaria del pino y el gran gorgojo del pino

Abstract

Comunicación presentada en la Reunión celebrada en la ETSI Montes, Forestal y del Medio Natural de la Universidad Politécnica de Madrid, el día 8 de octubre de 2015.Pine trees are long -lived, widespread organisms that have to cope with multiple biotic stresses during their life cycle. To face against biological aggressions pine trees harbour terpenoids and phenolics as major chemical defences that may avoid or deter the attack providing resistance. Mono and sesquiterpenes, the volatile fraction of oleoresin, have been found to be adaptive resistance traits and to differ between and within species. However much less attention has been paid to sources of phenotypic variation in diterpenes, the non- volatile fraction of oleoresin that seals the stem wounds after oxidization. We examined the induced defensive responses of the diterpene fraction in two pine species, one native (Maritime pine) and one exotic (Monterey pine) to Europe, against two native insect herbivores, the bark chewing pine weevil and the pine processionary caterpillar; and explored the association between the induced chemical profile of diterpenes in each species and the subsequent damage. We found that the two pine species showed different constitutive and induced diterpene concentration in stem and needles. Whereas Pinus pinaster increased total di terpene concentration only in the stem against the two herbivores, P. radiata diterpene defences were locally induced in the damaged tissue due to herbivore feeding activity. Regarding to the chemical diterpene profile, the native P. pinaster produced a ge neral induced response increasing diterpene concentration against the two herbivores in the stem, whereas the exotic P. radiata showed a weevil -induced increase and a caterpillar -induced decrease in the most abundant diterpenes in the needles.Peer reviewe