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Mechanisms underlying the impacts of ozone on photosynthetic performance

Lookup NU author(s): Dr Eleni Goumenaki, Dr Tahar Taybi, Professor Anne Borland, Professor Jerry Barnes

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Abstract

The present study examined the effects of ozone on the photosynthetic capacity of two 'Cos' lettuce (Lactuca sativa L) varieties grown widely in Greece. The role of Rubisco and Rubisco activase in mediating the O-3-enhanced decline in carboxylation efficiency was explored. The transcript and protein abundances of Rubisco activase plus Rubisco large and small subunits were monitored over the leaf life-span in plants subject to ozone levels similar to those experienced regularly during the spring and summer time in Southern Europe (100 ppb ozone 8 h d(-1)). Ozone exposure led to a decline in net CO2 fixation (i.e. a decline in the maximum light- and CO2-saturated rate of assimilation, i.e. A(max)), a reduction in carboxylation efficiency (V-cmax) and a decline in the maximum modelled capacity for RuBP regeneration (J(max)). The decline in carboxylation efficiency induced by ozone was linked to a decrease in the amount of Rubisco LSU and SSU protein, an effect resulting-at least in part-from a decrease in the transcript abundance of rbcS1 and to a lesser extent of rbcL. The work outlined in this paper shows that members of the rbcS gene family respond differentially to ozone-induced oxidative stress. (C) 2010 Elsevier B.V. All rights reserved.


Publication metadata

Author(s): Goumenaki E, Taybi T, Borland A, Barnes J

Publication type: Article

Publication status: Published

Journal: Environmental and Experimental Botany

Year: 2010

Volume: 69

Issue: 3

Pages: 259-266

Print publication date: 21/04/2010

ISSN (print): 0098-8472

ISSN (electronic): 1873-7307

Publisher: Elsevier BV

URL: http://dx.doi.org/10.1016/j.envexpbot.2010.04.011

DOI: 10.1016/j.envexpbot.2010.04.011


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