Stress Reactions of Scots Pine Trees to Injuring by Ground Fire
N. E. SUDACHKOVA, L. I. ROMANOVA, N. V. ASTRAKHANTSEVA, M. V. NOVOSELOVA, I. V. KOSOV
V. N. Sukachev Institute of Forest, RAS, SB, 660036, Krasnoyarsk, Akademgorodok, 50/28
Keywords: сосна обыкновенная, низовой пожар, камбий, фотосинтетические пигменты, углеводы, антиоксидантные ферменты, Scots pine, ground fire, cambium, photosynthetic pigments, carbohydrates, antioxidant enzymes
Abstract
At the beginning of the growing season in the I age class stand of Scots pine ( Pinus sylvestris L.) in the Krasnoyarsk forest-steppe controlled burning was carried out to simulate moderate ground fire. The structure of the annual rings of wood and trophic supply, cambial zone antioxidant system condition, the content of photosynthetic pigments in the needles of the suppressed and dominant trees on the experimental and control plots after 3 hours, 5 days and 2.5 months after the fire were studied. The fire narrowed the width of the annual wood ring due to decrease of number and size of early and late tracheids. The primary reactions to the pyrogenic heat shock were sharp decrease in chlorophyll content in needles, manifestation of oxidative stress in stem cambial zone - elevated level of hydrogen peroxide and activity of most antioxidant enzymes, reduction of non-structural carbohydrates pool. Restoration of cambium function after fire was promoted by increasing activity of amylase, invertase and peroxidase.
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