The forest-formation process in Siberia both earlier and at the present stage occurs under the influence of forest fires. Heat stress due to fire ef-fects is exerting strong effects on plant physiology and resultant forest dynamics. During forest fires the temperature gradient in the crown layer is very steep and heat events can have major impact on photosynthetic features of plants. For the evalua-tion of ability to restoration and preservation of ac-climatization effects semi-quantitative definition of the content of proteins of thermal shock (heat shock proteins, Hsp) and photosynthetic activity of needles was carried out in ordinary pine (Pinus sylvestris L.) as criteria in the assessment of gen-eral physiological status during after fire period. The researches were conducted in pine saplings of green-motley grass group of the types of the wood settling down in the forest-steppe zone of Southern Siberia. In 2014 on experimental site testing con-trolled burning imitating local low-intensity fire was carried out. Conducted pilot studies revealed the distinctions in relative parameter of slowed-down fluorescence and in the maintenance of Hsp, testi-fying to the modification of some physiological pro-cesses in plants after experimental burning out. Perhaps, due to the accumulation of Hsp 70 and Hsp 101 the needles of ordinary pine formed after controlled burning, were more resistant to repeated high temperature stress.
hyperthermia, fluorescence, heat shock proteins, forest fires
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