Издательство: Просвещение
Год выпуска: 1978
Количество страниц: 282 с.
Издательство: издательство Московского общества испытателей природы
Год выпуска: 1952
Количество страниц: 652 с.
Издательство: издательство Московского общества испытателей природы
Год выпуска: 1950
Количество страниц: 504 с.
Издательство: издательство Московского общества испытателей природы
Год выпуска: 1947
Количество страниц: 342 с.
Издательство: Кинигэ издательствота
Год выпуска: 1980
Количество страниц: 180 с.
Издательство: Народная асвета
Год выпуска: 1982
Количество страниц: 248 с.
Издательство: Издательство Академии наук СССР
Год выпуска: 1960
Количество страниц: 142 с.
Количество страниц: 11 с.
Changes in the fatty acid composition of phospholipids in buds during the winter-spring period (January-May) were studied in silver birch (Betula pendula Roth) growing in Karelia and Yakutia. Phospholipids were isolated from total lipids using column chromatography, while fatty acids were separated through gas chromatography. The metrics for acyl-lipid desaturase activity were represented by the ratios of stearoyl- (SDR), oleoyl- (ODR), and linoleoyl- (LDR) desaturases. Our findings demonstrate that, regardless of geographical location, the predominant phospholipid fraction during the development of primordia within the bud consists of unsaturated fatty acids. During the period of exogenous bud dormancy, dienoic acids were the most prevalent; however, their share declined by the onset of the growing season, while the proportion of trienoic acids increased. These changes were accompanied by a slight rise in the double bond index. Conversely, the unsaturation index nearly doubled by March, with this change being particularly pronounced in Yakutia. Simultaneously, the SDR and ODR values were high, indirectly indicating the active involvement of ω9 and ω6 desaturases in maintaining the liquid-crystalline state of phospholipids. The LDR value in phospholipids was the lowest, yet it nearly tripled by the onset of the growing season in both Karelia and Yakutia. We hypothesize that the liquid state of phospholipids in the cell membranes of meristematic tissue in the buds of silver birch growing in Karelia and Yakutia during the winter-spring period is sustained by high desaturase activity, with the most significant response to temperature changes observed in acyl-lipid ω3 desaturase. Furthermore, through the course of evolution, silver birch in Yakutia has developed an additional mechanism that involves a pronounced reduction in cell and tissue water content, which also contributes to maintaining an ordered state of phospholipids and their functions, particularly when exposed to extremely low air temperatures and permafrost.
Жирнокислотный состав фосфолипидов в почках березы повислой в зимне-весенний период в условиях Карелии и Якутии / Л. В. Ветчинникова, А. Ф. Титов, Т. Д. Татаринова [и др.] ; Институт леса Карельского научного центра РАН, Институт биологии Карельского научного центра РАН, Институт биологических проблем криолитозоны // Природные ресурсы Арктики и Субарктики. - 2024. - N 4, Т. 29. - C. 597-607. - DOI: 10.31242/2618-9712-2024-29-4-597-607
DOI: 10.31242/2618-9712-2024-29-4-597-607
Количество страниц: 8 с.
The response of biota to both global and regional climate changes represents a critical topic extensively examined in the scientific literature. This study aims to investigate the correlation between climatic changes in Central Yakutia and the phenological development of three indigenous steppe plant species. The species under consideration include Gagea pauciflora, Phlox sibirica, and Phlomoides tuberosa, which belong to different rhythmological groups. The research employed data from long-term phenological observations conducted in accordance with the methodology established by I. N. Beydeman (1974). A comprehensive analysis of the long-term climatic and phenological data reveals that the changing climate in Central Yakutia elicits a modest yet complex phenological response among the studied species. Notably, Gagea pauciflora, an ephemeroid, demonstrates the highest degree of phenological stability over a 50-year observation period, with all recorded shifts in its phenological development remaining statistically insignificant at the 0.05 level. The seasonal development of Gagea pauciflora occurs primarily in May and June and exhibits minimal sensitivity to meteorological conditions, indicating the species’ resilience to spring temperature fluctuations. Statistically significant alterations in phenological timing were noted exclusively during the vegetation termination phase for Phlox sibirica and Phlomoides tuberosa. The observed inertia in the phenological responses of these species to the climatic changes in Central Yakutia underscores a diverse array of adaptations among plants to northern environmental conditions, tenabling them to resist regional climate shifts and sustain phenological stability.
Фенологическая устойчивость степных растений в условиях меняющегося климата Центральной Якутии / Н. С. Данилова, С. З. Борисова, Н. Н. Егорова, Д. Н. Андросова ; Институт биологических проблем криолитозоны, Северо-Восточный федеральный университет им. М. К. Аммосова // Природные ресурсы Арктики и Субарктики. - 2024. - N 4, Т. 29. - C. 589-596. - DOI: 10.31242/2618-9712-2024-29-4-589-596
DOI: 10.31242/2618-9712-2024-29-4-589-596