Effect of cytokinins on oxidative stress in tobacco plants under nitrogen deficiency

► N-deficiency-induced senescence, the rise in ROS trigger oxidative stress. ► Transgenic plants expressing IPT gene coding the rate-limiting step in CKs synthesis. ► WT plants under N-limited, reduced biomass and increased the generation of ROS. ► Transgenic plants under N-limited, did not produce...

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Vydáno v:Environmental and experimental botany Ročník 72; číslo 2; s. 167 - 173
Hlavní autoři: Rubio-Wilhelmi, M.M., Sanchez-Rodriguez, E., Rosales, M.A., Begoña, Blasco, Rios, J.J., Romero, L., Blumwald, E., Ruiz, J.M.
Médium: Journal Article
Jazyk:angličtina
Vydáno: Amsterdam Elsevier B.V 01.09.2011
Elsevier
Témata:
aerobiosis
Antioxidant system
Biological and medical sciences
Biomass
Cytokinins
Fundamental and applied biological sciences. Psychology
genes
leaves
nitrogen
nitrogen content
Nitrogen deficiency
Oxidative stress
plant stress
Tobacco plants
transgenic plants
Antioxidant system
Cytokinins
Oxidative stress
Nitrogen deficiency
Tobacco plants
Nicotiana
Deficiency
Plant ecology
Antioxidant
Nitrogen
Cytokinin
System
Dicotyledones
Angiospermae
Botany
Plant growth substance
Spermatophyta
Solanaceae
ISSN:0098-8472, 1873-7307
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Shrnutí:► N-deficiency-induced senescence, the rise in ROS trigger oxidative stress. ► Transgenic plants expressing IPT gene coding the rate-limiting step in CKs synthesis. ► WT plants under N-limited, reduced biomass and increased the generation of ROS. ► Transgenic plants under N-limited, did not produce high ROS and maintained biomass. ► The expression of P SARK∷IPT in plants could improve nitrogen use efficiency. Wild type and transgenic tobacco plants expressing isopentenyltransferase, a gene coding the rate-limiting step in cytokinin synthesis, were grown under limited nitrogen (N) conditions. Our results indicated that the WT plants subjected to N deficiency displayed reduced biomass and relative growth rates, increased levels of oxidative damage and reduced foliar concentrations of the different N forms. However, the transgenic plants expressing P SARK∷IPT, in spite of showing a significant decline in all the N forms in the leaf, avoided the alteration of the oxidative metabolism and maintained biomass and the relative growth rates at control levels, under suboptimal N conditions. These results suggest that the increased cytokinin synthesis in the transgenic plants is an effective mechanism to improve N-use efficiency.
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ISSN:0098-8472
1873-7307
DOI:10.1016/j.envexpbot.2011.03.005