Аннотация
This study presents the first analysis of the composition and seasonal dynamics of low-temperature-induced dehydrins in the shoots of Siberian spruce (Picea obovata Ledeb.) from the cryolithozone of Central Yakutia. Dehydrins were identified using antibodies specific to the conserved K-segment. Most major dehydrins (17–57 kDa) were present constitutively throughout the annual cycle. In contrast, low-molecular-weight dehydrins (13 and 15 kDa) were seasonal and inducible, disappearing in summer and reappearing during autumn cold acclimation. High levels of major dehydrins persisted through the winter, coinciding with ultra-low temperatures and maximum frost resistance. These dynamics and the substantial abundance of dehydrins are likely key to the unique extreme cold adaptation of P. obovata in the Yakutian cryolithozone.
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