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Chernyad’ev, I. I.

doi:10.1023/a:1020743114917

Cited by 2 publications

(6 citation statements)

References 9 publications

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“…On the other hand, several reports characterize SLD as a variable physiological parameter, which determines adaptive reactions of the photosynthetic apparatus of plants to unfavorable environmental factors [84,87]. We were able to demonstrate [84] that, in plants of the family Gramineae, such as wheat, meadow fescue (Festuca pratensis Huds. ), and reed fescue (Festuca arindinacea Schreb.…”

Section: Structural Changesmentioning

confidence: 59%

“…On the one hand, there is evidence that the value of SLD varies within a narrow range, being a heritable species-specific trait [85,86]. On the other hand, several reports characterize SLD as a variable physiological parameter, which determines adaptive reactions of the photosynthetic apparatus of plants to unfavorable environmental factors [84,87]. We were able to demonstrate [84] that, in plants of the family Gramineae, such as wheat, meadow fescue (Festuca pratensis Huds.…”

Section: Structural Changesmentioning

confidence: 66%

“…Drying of the hydrobiont Agrocladium cupidatum L. caused a considerable decrease (of the same extent) in the activity of both enzymes [79]. During drought, the activities of Rubisco and GAPDH in mature plants of wheat cultivars Saratovskaya 29 and Erythrospermum 84 decreased by as little as 10-12% [84]. Most likely, these differences arose from diverse conditions of water stress (which varied in severity) and age-or speciesdependent factors.…”

Section: Dark Reactions Of Photosynthesismentioning

confidence: 98%

“…As a rule, SLD is expressed in grams dry weight per square decimeter. Ontogeny-and environmental factorrelated changes in SLD have not been studied in sufficient detail [84]. On the one hand, there is evidence that the value of SLD varies within a narrow range, being a heritable species-specific trait [85,86].…”

Section: Structural Changesmentioning

confidence: 99%

“…), changes in the value of SLD values correlated with the intensity of photosynthetic carbon dioxide assimilation and the activity of carbon metabolism enzymes (Rubisco, GAPDH, and MDH). It is conceivable that SLD reflects the state and activity of the photosynthetic apparatus and may characterize its variability and resistance under stress conditions [84].…”

Section: Structural Changesmentioning

confidence: 99%

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Effect of water stress on the photosynthetic apparatus of plants and the protective role of cytokinins: A review

Chernyad’ev

2005

Appl Biochem Microbiol

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In recent years, the definition of the term stress (meaning "strain" in English) has been extended, so that it is now used in reference to higher and lower plants and even microorganisms, as opposed to the original usage implying humans and animals [1][2][3]. The Canadian physiologist Hans Selye, who coined the term in the 1930s [4], believed that the ability of an organism to adaptation is related to concentration and exertion, in the sense of strenuous efforts undertaken to mobilize this organism's defense systems. Similarity of stress reactions in bacteria (the most ancient inhabitants of Earth) [3] to those occurring in contemporary representatives of eukaryotes [1, 2, 4] is currently a welldocumented fact.The most frequent stress effect experienced by plants and their photosynthetic apparatus is water deficiency. The greenhouse effect (which becomes more and more pronounced), increased evaporation and reduction of water basins, elevation of mean annual temperature, and augmented contamination of the atmosphere by anthropogenic microadulterants (first of all, methane and oxides of carbon and nitrogen) [5, 6] may disrupt gas exchange, dark and light reactions of photosynthesis [7][8][9], and the unified hydrodynamic system of water supply, transport, and transpiration, which ensures normal water homeostasis in plants [10].Photosynthesis is particularly sensitive to effects of water deficiency and increased temperature. Even a small decrease in the water potential of a plant causes its stomata to close, which entails ëé 2 deficiency in photosynthesizing tissues and decreases the intensity of photosynthetic assimilation of CO 2 (which is the integral parameter of the process). As the degree of hydration of the tissues decreases, the photosynthetic apparatus of plants undergoes functional changes, which further develop into disruption of its structure [7-9, 11].Studies of the resistance of agricultural plants to water deficiency are of great importance for the understanding of the mechanism of disrupting effects of stress. Such studies are also necessary for developing scientifically well-grounded methods for restoring the operation of the photosynthetic apparatus and increasing its stability (which in turn increase the harvest. However, alterations of the photosynthetic apparatus (and structural and functional characteristics of chloroplasts in particular), taking place under the conditions of water deficiency, are not as well studied as those occurring under the effect of other stress types (e.g., decreased or increased temperatures, deficiency or excess of nitrogen or other nutritive minerals, and amount and quality of light).Plant resistance to water deficiency is related to metabolic changes and functional and structural rearrangements of photosynthesizing tissues. These changes are coordinated by regulatory systems, of which the most important for processes of plant adaptation are those involving cytokinins and other phytohormones. Cytokinins, which regulate multiple functions in plant cells, were shown to ...

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Section: Structural Changesmentioning

confidence: 59%

Section: Structural Changesmentioning

confidence: 66%

Section: Dark Reactions Of Photosynthesismentioning

confidence: 98%

Section: Structural Changesmentioning

confidence: 99%

Section: Structural Changesmentioning

confidence: 99%

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Effect of water stress on the photosynthetic apparatus of plants and the protective role of cytokinins: A review

Chernyad’ev

2005

Appl Biochem Microbiol

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Natural and synthetic cytokinins and their applications in biotechnology, agrochemistry and medicine

Oshchepkov¹,

Kalistratova²,

Savelieva³

et al. 2020

Russ. Chem. Rev.

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The review is devoted to cytokinins — classical plant hormones known for more than six decades. Nevertheless, different aspects of the action of cytokinins are still being investigated. Relevant studies produced interesting, often unexpected, results, which cast doubt on the old paradigms and open new prospects for the use of these phytohormones. Particular attention is given to recent advances in the applications of natural cytokinins and their synthetic analogues in biotechnology, agriculture, medicine and cosmetics. The chemical synthesis, properties and the possible use of artificial cytokinins are considered in detail. The review is aimed at researchers interested in the development and applications of new biologically active compounds with a wide spectrum of action on diverse biological objects, from plants to humans. The bibliography includes 233 references.

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Untitled

Cited by 2 publications

References 9 publications

Effect of water stress on the photosynthetic apparatus of plants and the protective role of cytokinins: A review

Effect of water stress on the photosynthetic apparatus of plants and the protective role of cytokinins: A review

Natural and synthetic cytokinins and their applications in biotechnology, agrochemistry and medicine

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