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Träfflista för sökning "WFRF:(Demidchik V. V.) "

Search: WFRF:(Demidchik V. V.)

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  • Voitsekhovskaja, O. V., et al. (author)
  • Photosynthetic activity as assessed via chlorophyll a fluorescence suggests a role of potassium channels in root to shoot signaling
  • 2020
  • In: Photosynthetica (Praha). - : Institute of Experimental Botany. - 0300-3604 .- 1573-9058. ; 58:2, s. 608-621
  • Journal article (peer-reviewed)abstract
    • Potassium is indispensable for plant growth. Recently, a role of K+ channels has emerged in sensing and transducing stress and nutrient status. Tetraethylammonium (TEA(+)) is a specific blocker of K+ transport and affects K+ channel gene expression. Two barley varieties with contrasting salinity tolerance, and a chlorophyll b-less mutant, were grown either in the presence of TEA(+) alone or combined with NaCl, at two different concentrations of external K+ and Ca2+, and were analyzed nine days after germination. Chlorophyll a transients monitored via JIP-tests were used to evaluate the state of the photosynthetic machinery. In contrast to reported responses to K+ deficiency, TEA(+) inhibited shoot growth while inducing root growth and increasing photosynthetic performance. Both TEA(+) and NaCl induced the appearance of negative K-bands in OJIP kinetics and an increase in PIABS, indicating a stimulation of photosynthesis by increased sink strength in the context of root to shoot signaling.
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3.
  • Tyutereva, Elena V., et al. (author)
  • The levels of peroxisomal catalase protein and activity modulate the onset of cell death in tobacco BY-2 cells via reactive oxygen species levels and autophagy
  • 2018
  • In: Functional Plant Biology. - 1445-4408 .- 1445-4416. ; 45:1-2, s. 247-258
  • Journal article (peer-reviewed)abstract
    • In plant cells, peroxisomes participate in the metabolism of reactive oxygen species (ROS). One of the major regulators of cellular ROS levels-catalase (CAT)-occurs exclusively in peroxisomes. CAT activity is required for immunity-triggered autophagic programmed cell death (PCD). Autophagy has been recently demonstrated to represent a route for degradation of peroxisomes in plant cells. In the present study, the dynamics of the cellular peroxisome pool in tobacco BY-2 cell suspension cultures were used to analyse the effects of inhibition of basal autophagy with special attention to CAT activity. Numbers of peroxisomes per cell, levels of CAT protein and activity, cell viability, ROS levels and expression levels of genes encoding components of antioxidant system were analysed upon application of 3-methyladenine (3-MA), an inhibitor of autophagy, and/or aminotriazole (AT), an inhibitor of CAT. When applied separately, 3-MA and AT led to an increase in cell death, but this effect was attenuated by their simultaneous application. The obtained data suggest that both the levels of CAT protein in peroxisomes as well as CAT activity modulate the onset of cell death in tobacco BY-2 cells via ROS levels and autophagy.
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