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Ultraviolet-B radiation and nitrogen affect nutrient concentrations and the amount of nutrients acquired by above-ground organs of maize

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Author

  • Carlos M. Correia
  • João F Coutinho
  • Eunice A. Bacelar
  • Berta M. Goncalves
  • Lars Olof Björn
  • José Moutinho Pereira

Summary, in English

UV-B radiation effects on nutrient concentrations in above-ground organs of maize were investigated at silking and maturity at different levels of applied nitrogen under field conditions. The experiment simulated a 20% stratospheric ozone depletion over Portugal. At silking, UV-B increased N, K, Ca, and Zn concentrations, whereas at maturity Ca,Mg, Zn, and Cu increased and N, P and Mn decreased in some plant organs. Generally, at maturity, N, Ca, Cu, and Mn were lower, while P, K, and Zn concentrations in stems and nitrogen-use efficiency (NUE) were higher in N-starved plants. UV-B and N effects on shoot dry biomass were more pronounced than on nutrient concentrations. Nutrient uptake decreased under high UV-B and increased with increasing N application, mainly at maturity harvest. Significant interactions UV-B x N were observed for NUE and for concentration and mass of some elements. For instance, under enhanced UV-B, N, Cu, Zn, and Mn concentrations decreased in leaves, except on Nstressed plants, whereas they were less affected by N nutrition. In order to minimize nutritional, economical, and environmental negative consequences, fertiliser recommendations based on element concentration or yield goals may need to be adjusted.

Publishing year

2012

Language

English

Publication/Series

Scientific World Journal

Volume

2012

Document type

Journal article

Publisher

Hindawi Limited

Topic

  • Biological Sciences

Keywords

  • ultraviolet-B radiation
  • nutrition
  • maoze

Status

Published

Project

  • Photobiology

Research group

  • Photobiology

ISBN/ISSN/Other

  • ISSN: 2356-6140