ACCUMULATION OF DEHYDRINS IN SIBERIAN STONE PINE NEEDLES IN THE CONDITIONS OF THE HIGH-ALTITUDE ZONE OF THE WESTERN SAYAN
I. G. Gette1, N. V. Pakharkova1, N. E. Korotaeva2
1Siberian Federal University, Krasnoyarsk, Russian Federation
2Siberian Institute of Plant Physiology and Biochemistry, Russian Academy of Sciences, Siberian Branch, Irkutsk, Russian Federation
Keywords: Pinus sibirica Du Tour, dehydrin proteins, winter dormancy
Abstract
Current climate change has a significant impact on the functioning of forest ecosystems. For mountainous areas, it is typical for undergrowth to colonize new territories. An urgent task in the observed conditions is to study the adaptation mechanisms of dominant trees. The object of the study was Siberian stone pine trees ( Pinus sibirica Du Tour) of the second age class, growing in the conditions of the altitudinal zonation of the Western Sayan. Important biochemical factors of resistance to stress associated with moisture loss include the synthesis of hydrophilic proteins. For the first time for this species, the features of accumulation of stress proteins-dehydrins (dhn) in needles during the transition to winter dormancy in conditions of altitudinal zonation were studied. It was found that open habitats of Siberian pine growing above the forest line are characterized by a reliable increase in the accumulation of dhn 65 kD in needles. In the studied areas, significant differences in the accumulation of stress protein in individual trees were recorded. The trees most resistant to climatogenic stress were identified as the most promising for obtaining seeds and reproducing forests under climate change conditions. The results obtained suggest the possibility of using the definition of dhn in needles, in combination with other parameters, to develop a comprehensive approach to identifying resistant and productive trees.
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