Nitrogen-Use Efficiency in Relation to Different Forms and Application Rates of Se in Lettuce Plants |
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Authors: | Juan J Ríos Begoña Blasco Luis M Cervilla Maria M Rubio-Wilhelmi Miguel A Rosales Eva Sanchez-Rodriguez Luis Romero Juan M Ruiz |
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Institution: | (1) Department of Plant Physiology, Faculty of Science, University of Granada, 18071 Granada, Spain |
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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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