Abstract
The results of comparative analysis of adaptive features of bark of the Spiraea beauverdiana S.K. Schneid. (Rosaceae Juss.) are presented in the extreme conditions of the Central Eastern solfatara field of the Golovnin volcano’s caldera and typical conditions (pinus pumila-shrub sasa sp.). A statistical analysis of the structural parameters of annual stem S. beauverdiana bark has been conducted, which has made it possible to distinguish features dependent on extreme environmental conditions. Parameters of annual stem bark have been elicited, which have higher than normal values: stem diameter, bark thickness, the thickness of periderm and phellem, radial diameter of phellem cells, lack of biseriate phloem rays. It was found the formation of distinct zones of bark abnormal structures having adaptive character in extreme conditions of solfataric fields. These abnormal zones are characterized by the own line of symmetry, they are sphere-shaped, tissues and cells indices forming these structures massively differ from the same parts with typical structures. The structural response of the annual stem bark of S. beauverdiana is likely to have an adaptive nature.
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