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High irradiance induces photoprotective mechanisms and a positive effect on NH 4 + stress in Pisum sativum L.

AutorAriz, Idoia ; Esteban, Raquel ; García-Plazaola, José I.; Becerril, José M.; Aparicio-Tejo, Pedro María ; Morán, José F.
Palabras claveAmmonium stress
Superoxide dismutase
Violaxanthin cycle
Fecha de publicaciónsep-2010
CitaciónJournal of Plant Physiology 167(13): 1038-1045 (2010)
ResumenPhotosynthesis provides plant metabolism with reduced carbon (C) but is also the main source of oxidative stress in plants. Likewise, high doses of NH4+ as sole N source have been reported to be toxic for most plants, resulting in reduced plant growth and restricting C availability. The combination of high photosynthetic photon flux densities (PPFD) and NH4+ nutrition may provide higher C availability but could also have a detrimental effect on the plants, therefore the objective of this study is to evaluate whether NH4+ induces photo-oxidative stress that is exacerbated under high light conditions. Pea plants (Pisum sativum cv. sugar-snap) were grown hydroponically with NH4+ (0.5, 2.5, 5 and 10mM) under high (750μmolphotonsm -2s -1) or low PPFD conditions (350μmolphotonsm -2s -1). High PPFD contributes to a higher tolerance to ammonium by pea plants, as it originated higher biomass content due to higher photosynthetic rates. However, a deficit of N (0.5 and 2.5mM NH4+) under high PPFD conditions caused an antioxidant response, as indicated by increased photoprotective pigment and chloroplastic superoxide dismutase contents. Plants grown with higher doses of N and high PPFD showed less need for photoprotection. An increase in the specific leaf weight (SLW) ratio was observed associated not only with high PPFDs but also with the highest NH4+ dose. Overall, these results demonstrate that, despite the activation of some photoprotective responses at high PPFD, there were no photoinhibitory symptoms and a positive effect on NH4+ toxicity, thus suggesting that the harmful effects of NH 4 + are not directly related to the generation of photo-oxidative stress.
Descripción8 p., 7 figures and bibliography
Versión del editorhttp://dx.doi.org/10.1016/j.jplph.2010.02.014
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