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1.
Sofronova V. E. Chepalov V. A. Dymova O. V. Golovko T. K. 《Russian Journal of Plant Physiology》2020,67(4):661-670
Russian Journal of Plant Physiology - Dynamics of chlorophyll a fluorescence changes (including JIP test parameters) and photosynthetic pigments were studied in oat (Avena sativa L.) leaves of late... 相似文献
2.
Dymova M. A. Voitova A. A. Dmitrieva M. D. Richter V. A. Kuligina E. V. 《Applied Biochemistry and Microbiology》2021,57(9):933-938
Applied Biochemistry and Microbiology - The efficiency of the binding of tumor-targeting phage particles displaying tumor-targeting peptides, which were obtained with phage-display technology, to... 相似文献
3.
Shelyakin M. A. Zakhozhiy I. G. Dalke I. V. Dymova O. V. Malyshev R. V. Golovko T. K. 《Russian Journal of Plant Physiology》2021,68(6):1048-1058
Russian Journal of Plant Physiology - Lichens are unique phototrophic organisms whose physiology of stress tolerance attracts much attention. Parameters of photosynthetic and respiratory activities... 相似文献
4.
A. A. Dymova M. M. Umarov N. V. Kostina M. V. Golichenkov M. V. Gorlenko 《Biology Bulletin》2016,43(5):390-397
It was found that ants significantly affect the physiological activity and functional diversity of soil microbial communities, and redistribution of biophilic elements (C and N) down through the profile occurs in anthills compared to the control soil, as well as their accumulation in the underground part of the ant nests. A high urease activity was revealed in ant nests and ants. Functional dissimilarities of bacterial communities in all studied objects were determined by the multisubstrate test. 相似文献
5.
Voitova A. A. Dmitrieva M. D. Dymova M. A. Vasileva N. S. Nushtaeva A. A. Richter V. A. Kuligina E. V. 《Russian Journal of Bioorganic Chemistry》2019,45(6):783-792
Russian Journal of Bioorganic Chemistry - Brain tumors are among the most intractable types of malignant neoplasms. Despite advances in the treatment of cancer, in particular, the development of... 相似文献
6.
Kechin A. A. Dymova M. A. Tishkin A. A. Grushin S. P. Dashkovskiy P. K. Filipenko M. L. 《Russian Journal of Genetics》2019,55(12):1499-1505
Russian Journal of Genetics - Sheep were one of the first animals to be domesticated. The history of sheep domestication and their widespread distribution dates to about ten thousand years ago,... 相似文献
7.
O. V. Dymova J. Grzyb T. K. Golovko K. Strzalka 《Russian Journal of Plant Physiology》2010,57(6):755-763
Comparative study was performed to assess the content and proportions of photosynthetic pigments and the violaxanthin cycle
(VXC) activity in winter-green and summer-green leaves of bugleweed (Ajuga reptans L.) plants grown in shaded (photosynthetically active radiation, PAR 150 μmol/(m2 s)) and sunny (PAR 1200 μmol/(m2 s)) habitats in the Botanic Garden of Jagiellonian University (Krakow, Poland). In overwintered and newly formed leaves of
shade plants, the content of green and yellow pigments was two times higher than in leaves of sun plants. The shade plants
were distinguished by accumulation of β-carotene, while lutein was predominant in leaves of sun plants. Under the action of
strong light (2000 μmol/(m2s)), the level of violaxanthin deepoxidation in winter-green leaves of shade and sun plants increased five- to sixfold, whereas
it changed insignificantly in summer-green leaves of shade plants. It is concluded that, in a shadetolerant species A. reptans, the photosynthetic apparatus of winter-green leaves in sun and shade plants and of summer-green leaves in sun plants is
protected against excess insolation by high activity of VXC. The carotenoids of summer-green leaves in shade plants are supposed
to function mainly as light-harvesting pigments. 相似文献
8.
We studied carotenoids composition and the activities of the xanthophylls pigments in evergreen conifers (Abies sibirica, Juniperus communis, Picea obovata) and dwarf-shrub (Vaccinium vitis-idaea), and in wintergreen herbaceous plants (Ajuga reptans, Pyrola rotundifolia) growing near Syktyvkar (61°67(/) N 50°77(/) E). The carotenoid pool consisted mainly of following xanthophylls: lutein (70%), neoxanthin (7-10%) and a xanthophylls cycle component - violaxanthin (3-15%). Zeaxanthin and antheraxanthin were found in conifer samples collected in December-March while in other species - during all year. A direct connection between xanthophyll pigment de-epoxidation level and light energy thermal dissipation was shown only for boreal conifer species. It is proposed that zeaxanthin plays a central role in the dissipation of excess excitation energy (nonphotochemical quenching) in the antenna of photosystem II (PSII). We conclude that the increase in the extent of de-epoxidation is beneficial for the retention of PSII activity for conifers in early spring and for herbs in summer. 相似文献
9.
V. E. Sofronova T. K. Antal O. V. Dymova T. K. Golovko 《Russian Journal of Plant Physiology》2014,61(6):751-759
Dissipation of light energy absorbed by photosystem II (PSII) in assimilating shoots of an evergreen shrub Ephedra monosperma was investigated during its transition from the vegetative to frost-tolerant state under natural conditions of Central Yakutia. The dynamics of modulated chlorophyll fluorescence and carotenoid content was analyzed during seasonal decrease in ambient temperature. The seasonal cooling was accompanied by a stepwise decrease in photochemical activity of PSII (F v/F m = (F m ? F 0)/F m). The decrease in F v/F m occurred from the beginning of September to the end of October, when the temperature was lowered from 10 to ?8°C. During winter period the residual activity of PSII was retained at about 30% of the summer values. The seasonal decrease in temperature was accompanied by a significant stimulation of pH-independent dissipative processes in reaction centers and antenna of PSII. The increase in energy losses was paralleled by a proportional increase in zeaxanthin content on the background of decreasing content of violaxanthin and β-carotene as possible zeaxanthin precursors. At the same time, inhibition of light-induced non-photochemical quenching in the PSII antenna was observed. The results suggest that principal photoprotective mechanisms during seasonal lowering of temperature are: (1) inactivation of PSII and dissipation of excitation energy in PSII reaction centers and (2) zeaxanthin-mediated energy dissipation in the antenna complexes. The first mechanism seems to prevail at early stages of seasonal cooling, whereas both mechanisms are recruited from the onset of sustained freezing temperatures. 相似文献
10.
V. E. Sofronova O. V. Dymova T. K. Golovko V. A. Chepalov K. A. Petrov 《Russian Journal of Plant Physiology》2016,63(4):433-442
We studied seasonal changes in the content and ratio between photosynthetic pigments in one-yearold needles of Scotch pine (Pinus sylvestris L.) growing in Central Yakutia. Maximum accumulation of chlorophylls in developed young needles occurred in July when light and temperature conditions were favorable. In this period, the needles were notable for a relatively high level of β-carotene and neoxanthin and a reduced content of lutein and the pigments of violaxanthin cycle (VXC). In the course of autumn hardening, the content of chlorophylls decreased two times. Total content of carotenoids remained the same, but pigment composition considerably changed when plants progressed from a vegetating to frost-resistant state. We revealed time and temperature ranges of variation for individual carotenoids. In the beginning of hardening at reduced and low abovezero temperatures, the content of β-carotene in the needles decreased, the pigment-protein complexes (PPC) became enriched in lutein, the pigment pool of VXC gradually increased, and the content of neoxanthin transiently rose. When average daily air temperature further decreased to near- zero values, the content of zeaxanthin sharply rose. In winter, high levels of lutein and zeaxanthin were maintained. Main changes in pigment complex of the needles of P. sylvestris were completed before the coming of steady below-zero temperatures. The obtained data suggested that, upon seasonal decrease in temperature in early stages of hardening, a decrease in the level of chlorophyll promotes a reduction in the quantity of absorbed radiant energy. Apparently, this is accompanied by activation of the role of lutein and neoxanthin that perform specific photoprotective functions in antenna PPC associated with a gradual decrease in plants’ ability to quench singlet energy of excited chlorophyll. Accumulation of zeaxanthin as a result of inhibition of back reaction of epoxidation at near-zero temperatures creates necessary prerequisites for turning on the mechanisms of steady dissipation of absorbed light energy, which do not depend on transmembrane proton gradient of thylakoids. At the same time, zeaxanthin can perform antioxidant functions both in PPC and in the lipid phase of thylakoid membranes. The obtained data point to an adaptive nature of the observed reactions and a specific role of individual pigments in structural and functional reorganization of photosynthetic machinery in the course of development of frost-resistance in the needles. 相似文献