Efecto del potencial agua, de la micobiota asociada a la madera, y de la defensa primaria de coníeras sobre el crecimiento de Amylostereum spp, simbiontes fúngicos de Sirex noctilio y Urocerus gigas, en Patagonia, Argentina.

LÓPEZ, S.N.; GRESLEBIN A.G.; GONZALEZ S.B.; PILDAIN M.B.

BOSQUE (VALDIVIA)

UNIV AUSTRAL CHILE

Lugar: Valdivia; Año: 2013 p. 161 - 172

0304-8799

Amylostereum areolatumand A. chailletiiare fungal symbionts of wood-boring wasp Sirex noctilioand Urocerus gigas, respectively. Pinusspecies are susceptible to the S. noctilio- A. areolatum pathosystem, and in Patagonia, Argentina, it was found that the felled wood of Pseudotsuga menziesiican be attacked by U. gigasand its symbiont. This study evaluated the relationship of A. areolatum, A. chailletiiand water potential (Ø0), the primary defense of Pinus ponderosaand P. menziesii, and endophytic mycobiota associated to the wood of both conifers. The different Ø0 were generated by variations in the osmotic potential; constitutive oleoresins of the bark and sapwood of both softwoods were extracted and characterized by GC and GC-MS and the effect of differential and majority compounds on growth of both fungi were assessed; the mycobiota was analyzed from isolates of the sapwood of healthy plants. It was observed that the growth of both fungi is significantly affected by the decrease of Ø0 and that A. chailletiigrew faster than A. areolatumunder lower Ø0. Oleoresins had a negative effect on the growth of both fungi with no differences between conifers. Hormonema dematioideswas the most common endophyte on P. menziesii; this fungus is characterized by its influence on the growth of other fungi and appears as a variable to be considered in setting of S. noctilio- A. areolatum pathosystem.