Effects of UV-B radiation and water stress on chlorophyll fluorescence parameters and activity of xanthophyll cycle in leaves of sessile oak (Quercus petraea) seedlings

Szőllősi, Erzsébet: Effects of UV-B radiation and water stress on chlorophyll fluorescence parameters and activity of xanthophyll cycle in leaves of sessile oak (Quercus petraea) seedlings. Acta biologica Szegediensis, (52) 1. pp. 241-242. (2008)

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Abstract

In the present study we investigated the photosynthetic responses of sessile oak seedlings to UV-B radiation and water stress in growth chamber experiment. Seedlings of sessile oak showed sensitivity to enhanced UV-B radiation which appeared in decreases of maximum photochemical efficiency (Fv/Fm) and actual photochemical efficiency of PSII ($F/Fm’). UV-B radiation and water stress induced 150 and 170 % increase of non-photochemical fluorescence quenching (NPQ) and threefold and fourfold elevation of activity of xanthophyll cycle as compared to the control, respectively. Seedlings exposed simultaneously to UV-B and water stress induced larger decrease of Fv/Fm, $F/Fm’ and RFD than those exposed separately to enhanced UV-B or water withdrawal as compared to control plants. Both UV-B radiation and water stress increased non-photochemical quenching with a parallel enhancement of zeaxanthin formation.

Item Type: Article
Event Title: Hungarian Congress on Plant Biology, 9., 2008, Szeged
Journal or Publication Title: Acta biologica Szegediensis
Date: 2008
Volume: 52
Number: 1
Page Range: pp. 241-242
ISSN: 1588-385X
Language: angol
Heading title: Proceedings
Uncontrolled Keywords: Természettudomány, Biológia
Additional Information: Bibliogr.: 242. p.; Abstract
Date Deposited: 2016. Oct. 17. 09:24
Last Modified: 2018. May. 25. 13:41
URI: http://acta.bibl.u-szeged.hu/id/eprint/22955

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