Role of cytokinins in senescence, antioxidant defence and photosynthesis

0500516 - ÚEB 2019 RIV CH eng J - Článek v odborném periodiku
Hönig, Martin - Plíhalová, Lucie - Husičková, A. - Nisler, Jaroslav - Doležal, Karel
Role of cytokinins in senescence, antioxidant defence and photosynthesis.
International Journal of Molecular Sciences. Roč. 19, č. 12 (2018), č. článku 4045. E-ISSN 1422-0067
Grant CEP: GA MŠMT(CZ) LO1204
Institucionální podpora: RVO:61389030
Klíčová slova: Antioxidant * Antioxidant enzymes * Antisenescent * Cytokinin * Derivative * Genes * Photosynthesis * Plant defence * Structure and activity relationship
Obor OECD: Plant sciences, botany
Impakt faktor: 4.183, rok: 2018

Cytokinins modulate a number of important developmental processes, including the last phase of leaf development, known as senescence, which is associated with chlorophyll breakdown, photosynthetic apparatus disintegration and oxidative damage. There is ample evidence that cytokinins can slow down all these senescence-accompanying changes. Here, we review relationships between the various mechanisms of action of these regulatory molecules. We highlight their connection to photosynthesis, the pivotal process that generates assimilates, however may also lead to oxidative damage. Thus, we also focus on cytokinin induction of protective responses against oxidative damage. Activation of antioxidative enzymes in senescing tissues is described as well as changes in the levels of naturally occurring antioxidative compounds, such as phenolic acids and flavonoids, in plant explants. The main goal of this review is to show how the biological activities of cytokinins may be related to their chemical structure. New links between molecular aspects of natural cytokinins and their synthetic derivatives with antisenescent properties are described. Structural motifs in cytokinin molecules that may explain why these molecules play such a significant regulatory role are outlined.
Trvalý link: http://hdl.handle.net/11104/0292579