High irradiance induces photoprotective mechanisms and a positive effect on NH4+ stress in Pisum sativum L

Copyright 2010 Elsevier GmbH. All rights reserved.

Bibliographische Detailangaben
Veröffentlicht in:Journal of plant physiology. - 1979. - 167(2010), 13 vom: 01. Sept., Seite 1038-45
1. Verfasser: Ariz, Idoia (VerfasserIn)
Weitere Verfasser: Esteban, Raquel, García-Plazaola, Jose Ignacio, Becerril, José María, Aparicio-Tejo, Pedro María, Moran, Jose Fernando
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2010
Zugriff auf das übergeordnete Werk:Journal of plant physiology
Schlagworte:Journal Article Research Support, Non-U.S. Gov't Quaternary Ammonium Compounds Carotenoids 36-88-4 Superoxide Dismutase EC 1.15.1.1 Ribulose-Bisphosphate Carboxylase EC 4.1.1.39 alpha-Tocopherol H4N855PNZ1
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520 |a Photosynthesis provides plant metabolism with reduced carbon (C) but is also the main source of oxidative stress in plants. Likewise, high doses of NH(4)(+) 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 NH(4)(+) 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 NH(4)(+) induces photo-oxidative stress that is exacerbated under high light conditions. Pea plants (Pisum sativum cv. sugar-snap) were grown hydroponically with NH(4)(+) (0.5, 2.5, 5 and 10 mM) under high (750 micromol photons m(-2)s(-1)) or low PPFD conditions (350 micromol photons m(-2)s(-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 2.5 mM NH(4)(+)) 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 NH(4)(+) 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 NH(4)(+) toxicity, thus suggesting that the harmful effects of NH(4)(+) are not directly related to the generation of photo-oxidative stress 
650 4 |a Journal Article 
650 4 |a Research Support, Non-U.S. Gov't 
650 7 |a Quaternary Ammonium Compounds  |2 NLM 
650 7 |a Carotenoids  |2 NLM 
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650 7 |a Superoxide Dismutase  |2 NLM 
650 7 |a EC 1.15.1.1  |2 NLM 
650 7 |a Ribulose-Bisphosphate Carboxylase  |2 NLM 
650 7 |a EC 4.1.1.39  |2 NLM 
650 7 |a alpha-Tocopherol  |2 NLM 
650 7 |a H4N855PNZ1  |2 NLM 
700 1 |a Esteban, Raquel  |e verfasserin  |4 aut 
700 1 |a García-Plazaola, Jose Ignacio  |e verfasserin  |4 aut 
700 1 |a Becerril, José María  |e verfasserin  |4 aut 
700 1 |a Aparicio-Tejo, Pedro María  |e verfasserin  |4 aut 
700 1 |a Moran, Jose Fernando  |e verfasserin  |4 aut 
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