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  • Barley (Hordeum vulgare cv. Bojos) plants cultured in low nitrogen (N) containing Hoagland solution (20 mg/l) were exposed to N deficiency (-N) over 15 days. Plants revealed relatively high tolerance to total N deficit because shoot length was not altered and dry biomass was depleted by ca. 30% while root length increased by ca. 50% and dry biomass remained unaffected. Soluble proteins and free amino acids decreased more pronouncedly in the roots. Antioxidants (glutathione and ascorbic acid) decreased in the shoots but increased or were not affected in the roots. Ascorbate peroxidase and glutathione reductase activities were depleted in shoots and/or roots while guaiacol peroxidase activity was stimulated in the shoots. In accordance, fluorescence signal of reactive oxygen species (ROS) and nitric oxide was elevated in shoots but no extensive changes were observed in roots if +N and -N treatments are compared. At the level of phenolic metabolites, slight increase in soluble phenols and some phenolic acids and strong elevation of flavonoid homoorientin was found in the shoots but not in the roots. Fluorescence microscopy in terms of detection of phenols is also discussed. We also briefly discussed accuracy of quantification of some parameters owing to discrepancies in the literature. It is concluded that N deficiency induces increase in shoot phenolics but also elevates symptoms of oxidative stress while increase in root antioxidants probably contributes to ROS homeostasis aimed to maintain root development.
  • Barley (Hordeum vulgare cv. Bojos) plants cultured in low nitrogen (N) containing Hoagland solution (20 mg/l) were exposed to N deficiency (-N) over 15 days. Plants revealed relatively high tolerance to total N deficit because shoot length was not altered and dry biomass was depleted by ca. 30% while root length increased by ca. 50% and dry biomass remained unaffected. Soluble proteins and free amino acids decreased more pronouncedly in the roots. Antioxidants (glutathione and ascorbic acid) decreased in the shoots but increased or were not affected in the roots. Ascorbate peroxidase and glutathione reductase activities were depleted in shoots and/or roots while guaiacol peroxidase activity was stimulated in the shoots. In accordance, fluorescence signal of reactive oxygen species (ROS) and nitric oxide was elevated in shoots but no extensive changes were observed in roots if +N and -N treatments are compared. At the level of phenolic metabolites, slight increase in soluble phenols and some phenolic acids and strong elevation of flavonoid homoorientin was found in the shoots but not in the roots. Fluorescence microscopy in terms of detection of phenols is also discussed. We also briefly discussed accuracy of quantification of some parameters owing to discrepancies in the literature. It is concluded that N deficiency induces increase in shoot phenolics but also elevates symptoms of oxidative stress while increase in root antioxidants probably contributes to ROS homeostasis aimed to maintain root development. (en)
Title
  • Variation of antioxidants and secondary metabolites in nitrogen-deficient barley plants
  • Variation of antioxidants and secondary metabolites in nitrogen-deficient barley plants (en)
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  • Variation of antioxidants and secondary metabolites in nitrogen-deficient barley plants
  • Variation of antioxidants and secondary metabolites in nitrogen-deficient barley plants (en)
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  • RIV/62157124:16370/14:43872742!RIV15-MSM-16370___
http://linked.open...avai/riv/aktivita
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  • P(EE2.3.30.0017), V
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  • 3-4
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  • 53010
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  • RIV/62157124:16370/14:43872742
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  • Reactive oxygen species; Phenolic metabolism; Oxidative stress; Mineral nutrition; Fluorescence microscopy (en)
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  • DE - Spolková republika Německo
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  • [0A5BBC29779A]
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  • Journal of Plant Physiology
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  • 171
http://linked.open...iv/tvurceVysledku
  • Babula, Petr
  • Jarošová, Markéta
  • Klejdus, Bořivoj
  • Kováčik, Jozef
http://linked.open...ain/vavai/riv/wos
  • 000332052200009
issn
  • 0176-1617
number of pages
http://bibframe.org/vocab/doi
  • 10.1016/j.jplph.2013.08.004
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  • 16370
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