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Ivanov V.B.,RAS Timiryazev Institute of Plant Physiology
Russian Journal of Plant Physiology | Year: 2011

A sound approach to the root usage as model objects for the assessment of biological activity of chemical substances and environmental stressors is suggested on the basis of the analysis of various inhibitor and radiation action on the root. It is analyzed on the cellular level, how steady growth is maintained under various stress action. Special attention is paid to the meristematic cell transition to elongation, which is controlled by the two groups of processes: the first ones determine the rate of cell proliferation and the second ones determine the cell life span in the meristem. The rate of cell proliferation is rather sensitive to various treatments; in contrast, the processes controlling the cell life span in the meristem are rather stable. It is shown that studying the kinetics of the root growth rate gives much more information than a single measurement of root length increment. A possibility of root usage for the search of efficient cytostatics is exemplified. The role of the quiescent center in growth resumption after various stressful treatments is considered. © 2011 Pleiades Publishing, Ltd. Source

Zorina A.A.,RAS Timiryazev Institute of Plant Physiology
Russian Journal of Plant Physiology | Year: 2013

This review presents the data on the role of eukaryotic-like serine/threonine protein kinases in the members of various groups of cyanobacteria. Information is provided for the two most studied model species (Anabaena and Synechocystis), differing in their morphology and ecophysiological features, and covers the entire period of study of this group of enzymes in cyanobacteria. © 2013 Pleiades Publishing, Ltd. Source

Ivanov V.B.,RAS Timiryazev Institute of Plant Physiology | Dubrovsky J.G.,National Autonomous University of Mexico
Trends in Plant Science | Year: 2013

Despite the relative simplicity of Arabidopsis root organization, there is no general agreement regarding the terminology used to describe the longitudinal zonation pattern (LZP) of this model system. In this opinion article, we examine inconsistencies in the terminology and provide a conceptual framework for the LZP that may be applied to all angiosperms. We propose that the root apical meristem (RAM) consists of the cell-proliferation domain where cells maintain a high probability to divide and the transition domain with a low probability of cell division; in both domains cells grow at the same, relatively low, rate. Owing to stochastic termination of cell proliferation in the RAM, the border between the domains is 'fuzzy'. Molecular markers analyzed together with quantitative growth and cell analyses could help to identify developmental zones along the root and lead to a better understanding of the LZP in angiosperms. © 2012 Elsevier Ltd. Source

Solovchenko A.E.,RAS Timiryazev Institute of Plant Physiology
Russian Journal of Plant Physiology | Year: 2013

Some species of unicellular green algae accumulate under unfavorable conditions high amounts of secondary carotenoids (SCar), which are not involved in photosynthesis and localized outside thylakoids. Such algae are cultivated on an industrial scale for production of carotenoids with valuable pharmacological properties. This review summarizes recent experimental data on the importance of secondary carotenogenesis for stress tolerance of unicellular green algae (Chlorophyta). The peculiarities of SCar biosynthesis, its induction and regulation under the action of various stressors as well as their localization in the cell and physiological effects of the accumulation of high amounts of these pigments are considered. Particular attention is given to the relationships between SCar biosynthesis and stress-induced biosynthesis of neutral lipids as well as the role of ROS as universal inducers and regulators of SCar biosynthesis. Various aspects of SCar protective function in the micfroalgal cells are discussed. © 2013 Pleiades Publishing, Ltd. Source

Voronin P.Y.,RAS Timiryazev Institute of Plant Physiology
Russian Journal of Plant Physiology | Year: 2014

An original experimental installation is described to illustrate the unit-based principle in the open-mode design construction of a modern system for the combined fluorometric and CO2/H2O gas exchange measurements in the studies of the light and dark reactions of photosynthesis and the transpiration of a detached leaf. © 2014 Pleiades Publishing, Ltd. Source

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