The anti-senescence activity of cytokinin arabinosides in wheat and arabidopsis is negatively correlated with ethylene production

0539302 - ÚEB 2021 RIV CH eng J - Článek v odborném periodiku
Kučerová, Z. - Rác, M. - Mikulík, Jaromír - Plíhal, Ondřej - Pospíšil, P. - Bryksová, M. - Sedlářová, M. - Doležal, Karel - Špundová, M.
The anti-senescence activity of cytokinin arabinosides in wheat and arabidopsis is negatively correlated with ethylene production.
International Journal of Molecular Sciences. Roč. 21, č. 21 (2020), s. 1-18, č. článku 8109. E-ISSN 1422-0067
Grant CEP: GA MŠMT(CZ) EF16_019/0000827; GA ČR(CZ) GA16-04184S
Institucionální podpora: RVO:61389030
Klíčová slova: Arabidopsis * Chlorophyll fluorescence * Cytokinin derivative * Ethylene * Oxidative stress * Photosystem II * Phytohormone * Senescence * Wheat
Obor OECD: Biochemistry and molecular biology
Impakt faktor: 5.924, rok: 2020
Způsob publikování: Open access
http://doi.org/10.3390/ijms21218109

Leaf senescence, accompanied by chlorophyll breakdown, chloroplast degradation and inhibition of photosynthesis, can be suppressed by an exogenous application of cytokinins. Two aromatic cytokinin arabinosides (6-benzylamino-9-β-d-arabinofuranosylpurines, BAPAs), 3-hydroxy-(3OHBAPA) and 3-methoxy-(3MeOBAPA) derivatives, have recently been found to possess high anti-senescence activity. Interestingly, their effect on the maintenance of chlorophyll content and maximal quantum yield of photosystem II (PSII) in detached dark-adapted leaves differed quantitatively in wheat (Triticum aestivum L. cv. Aranka) and Arabidopsis (Arabidopsis thaliana L. (Col-0)). In this work, we have found that the anti-senescence effects of 3OHBAPA and 3MeOBAPA in wheat and Arabidopsis also differ in other parameters, including the maintenance of carotenoid content and chloroplasts, rate of reduction of primary electron acceptor of PSII (QA) as well as electron transport behind QA, and partitioning of absorbed light energy in light-adapted leaves. In wheat, 3OHBAPA had a higher protective effect than 3MeOBAPA, whereas in Arabidopsis, 3MeOBAPA was the more efficient derivative. We have found that the different anti-senescent activity of 3OHBAPA and 3MeOBAPA was coupled to different ethylene production in the treated leaves: the lower the ethylene production, the higher the anti-senescence activity. 3OHBAPA and 3MeOBAPA also efficiently protected the senescing leaves of wheat and Arabidopsis against oxidative damage induced by both H2O2 and high-light treatment, which could also be connected with the low level of ethylene production.
Trvalý link: http://hdl.handle.net/11104/0316992