Journal
JOURNAL OF PLANT GROWTH REGULATION
Volume 29, Issue 2, Pages 164-170Publisher
SPRINGER
DOI: 10.1007/s00344-009-9130-7
Keywords
Biofortification; Lettuce; Selenate; Selenite; NUE
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Funding
- Plan Andaluz de Investigacion [AGR-161]
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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 mu M and selenite at 5 mu M 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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