ECOLOGICAL AND GEOGRAPHICAL FEATURES OF THE ACCUMULATION OF METABOLITES IN THE NEE-DLES OF LARIX CAJANDERI IN THE TERRITORY OF YAKUTIA

The accumulation of primary and secondary metabolites in Larix cajanderi needles in some areas of North (Kobyayskiy, Anabarskiy uluses and Verkhoyanskiy district), Western (Nyurbinskiy district and Vilyuyskiy ulus) and Central (Megino-Kangalasskiy ulus) Yakutia was studied. It was found that the maximum content of dihydroquercetin, rutin, pimaric, isopimaric and dehydroabietic acids in Larix cajanderi needles was recorded in the northern part of Yakutia, which may be associated with the protective functions of flavonoids and diterpenic acids from ultraviolet radiation under conditions of longer daylight hours in the spring and summer. ... A direct relationship was observed between the content of the studied flavonoids and diterpenic acids and the duration of daylight hours in the spring-summer period in the studied regions of Yakutia, which may be a confirmation of their protective functions from UV radiation. It is shown that as a result of processing the metabolomic profiles of Larix cajanderi needles by the method of principal components, three groups were formed, which correspond to the floristic regions of Yakutia. Samples of Larix cajanderi needles collected in Megino-Kangalassky, Vilyuisky ulus and Nyurba region formed a separate group, which is part of the Central Yakutsk floristic region, from the territory of the Verkhoyansk region and Kobyaysky ulus correspond to the Yano-Indigirsky floristic region, and from the Anabar and the ulus are located separately Arctic floristic region.

Age Variation of Wood Anatomical Characteristics in Larix cajanderi Tree

The paper is the first results of the study of age variation of wood anatomy in Larix cajanderi Mayr (Pinaceae). The anatomical study was made from one L. cajanderi tree grown in the optimal habitat for L. cajanderi within areal of this species. Age variability of anatomical characteristics in the direction from pith to bark and along the height of stem is described in detail. Mature wood in L. cajanderi is formed in the base of stem and at breast height in the growth rings numbers 31~40 inclusively, and in the middle of stem in the growth rings numbers 41~50 inclusively. Characteristic features of mature stem wood were not found near the top of tree. Maximal parameters of anatomical characters usually occur in the base of stem. Age variation of wood anatomical characteristics in L. cajanderi tree was obtained for the first time.