Аннотация: Effect of defoliation on resistance response of Siberian fir, Abies sibirica Ledeb., to fungal inoculation was investigated within three even-aged fir stands damaged by Siberian moth, Dendrolimus superans sibiricus Tschetw., and located in the Krasnoyarsk Territory (Central Siberia). Histological changes in tissues, accompanying the resistance response were examined in 30 fir trees (90-130 years old) of different defoliation degree (50, 75, 100 %) six weeks after single inoculation with Leptographium sp, vectored by Monochamus urussovi Fisch. (Coleoptera: Cerambycidae). It was recorded that the rate and intensity of defence response of phloem and xylem tissues to inoculation as well as percent of trees infested by the insect-vector differed significantly in dependence of defoliation degree. Trees of 50 percent defoliation significantly differed from trees of more severe defoliation in all parameters of defence response and percentage of colonisation by the beetle. The trees defoliated to 75 and 100% did not differ significantly in defence response activity and the number of the trees attacked by M. urussovi Strong difference in resistance to inoculation and colonisation by the beetle was recorded between trees defoliated in the current year and in the previous year. All infested by M, urussovi trees were characterised by the epidemic level of frequency of blue-stain fungi associated with this insect. The tendency was recorded to a decreased frequency of the pathogenic Ophiostoma sp. and a more frequent occurrence of the saprophyte O. curvicollis in trees defoliated in previous year which lost ability to defend against wounding and fungal infection.
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Держатели документа:
Russian Acad Sci, Lab Forest Zool, Inst Forest, Krasnoyarsk 660036, Russia
Доп.точки доступа:
Vetrova, V.P.; Stasova, V.V.; Pashenova, N.V.; Lieutier, F \ed.\; Mattson, WJ \ed.\; Mattso, WJ \ed.\