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- W2038161099 startingPage "758" @default.
- W2038161099 abstract "Ammonium is a paradoxical nutrient ion. Despite being a common intermediate in plant metabolism whose oxidation state eliminates the need for its reduction in the plant cell, as occurs with nitrate, it can also result in toxicity symptoms. Several authors have reported that carbon enrichment in the root zone enhances the synthesis of carbon skeletons and, accordingly, increases the capacity for ammonium assimilation. In this work, we examined the hypothesis that increasing the photosynthetic photon flux density is a way to increase plant ammonium tolerance. Wheat plants were grown in a hydroponic system with two different N sources (10mM nitrate or 10mM ammonium) and with two different light intensity conditions (300 μmol photon m(-2)s(-1) and 700 μmol photon m(-2)s(-1)). The results show that, with respect to biomass yield, photosynthetic rate, shoot:root ratio and the root N isotopic signature, wheat behaves as a sensitive species to ammonium nutrition at the low light intensity, while at the high intensity, its tolerance is improved. This improvement is a consequence of a higher ammonium assimilation rate, as reflected by the higher amounts of amino acids and protein accumulated mainly in the roots, which was supported by higher tricarboxylic acid cycle activity. Glutamate dehydrogenase was a key root enzyme involved in the tolerance to ammonium, while glutamine synthetase activity was low and might not be enough for its assimilation." @default.
- W2038161099 created "2016-06-24" @default.
- W2038161099 creator A5016506787 @default.
- W2038161099 creator A5034189573 @default.
- W2038161099 creator A5051600239 @default.
- W2038161099 creator A5070058573 @default.
- W2038161099 creator A5072345543 @default.
- W2038161099 creator A5081516883 @default.
- W2038161099 creator A5086522492 @default.
- W2038161099 date "2013-05-01" @default.
- W2038161099 modified "2023-10-01" @default.
- W2038161099 title "High irradiance improves ammonium tolerance in wheat plants by increasing N assimilation" @default.
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