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Nitrogen-Use Efficiency in Relation to Different Forms and Application Rates of Se in Lettuce Plants

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Abstract

The main objective of this work was to determine whether nitrogen-use efficiency (NUE) was affected by the application of different forms and dosages of selenium (Se), to ascertain the influence of this trace element in a biofortification program in lettuce plants. The parameters analyzed were biomass, NO3 concentration, and total reduced N as well as those defining NUE in plants: total nitrogen accumulation (TNA), nitrogen efficient ratio (NER), nitrogen-utilization efficiency (NUtE), and nitrogen-uptake efficiency (NUpE). According to our results, application of Se affected NUE in lettuce plants. With the application of selenite as well as selenate NO3 uptake was reduced, thus diminishing the NUpE and the foliar concentration of this anion. In addition, selenate application at a rate of 20 μM and selenite at 5 μM induced N utilization, reflected by an increase in NER and NUtE; this result coincides with augmented biomass production. Notably, our results indicate that when Se is applied at high rates, selenite is far more phytotoxic, this being associated with a higher reduction of NUE in these plants.

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Acknowledgments

This work was supported by Plan Andaluz de Investigacion, research group AGR-161.

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Correspondence to Juan J. Ríos.

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Ríos, J.J., Blasco, B., Cervilla, L.M. et al. Nitrogen-Use Efficiency in Relation to Different Forms and Application Rates of Se in Lettuce Plants. J Plant Growth Regul 29, 164–170 (2010). https://doi.org/10.1007/s00344-009-9130-7

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  • DOI: https://doi.org/10.1007/s00344-009-9130-7

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