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Ultraviolet-B radiation and nitrogen affect the photosynthesis of maize: a Mediterranean field study

Author:
  • Carlos M. Correia
  • José M. Moutinho Pereira
  • João F. Coutinho
  • Lars Olof Björn
  • José M. G. Torres-Pereira
Publishing year: 2005
Language: English
Pages: 337-347
Publication/Series: European Journal of Agronomy
Volume: 22
Issue: 3
Document type: Journal article
Publisher: Elsevier

Abstract english

The effects of UV-B radiation on the gas exchange rates, chlorophyll fluorescence, pigmentation, soluble sugars, starch, soluble proteins and carboxylating enzyme activities of maize (Zea mays L.) were investigated at four levels of applied nitrogen (0, 100, 200 and 300 kg ha−1 of N) under Mediterranean field conditions. The experiment simulated a 20% stratospheric ozone depletion over Portugal. Supplementary UV-B radiation and N deficiency reduced photosynthetic and transpiration rate, stomatal conductance, total chlorophyll, total carotenoids, soluble sugars and UV-B absorbing compounds concentration, as well as the pool size of the electron acceptors in PSII and ribulose-1,5-bisphosphate carboxylase oxygenase (RuBisCO) and phosphoenolpyruvate carboxylase (PEPCase) activities. Enhanced UV-B and N deficiency increased minimal and maximal chlorophyll fluorescence. The effect of additional UV-B on maize photosynthesis was dependent on the plant nutritional status, since the lower reduction of net photosynthetic rate occurred in N-stressed plants. At the same time, photosynthesis was less affected by N nutrition under high UV-B. Similar results were obtained for RuBisCO and PEPCase activities. N-starved plants had higher amounts of soluble proteins at high UV-B as compared to ambient UV-B. The starch concentration of N-deprived plants at ambient UV-B was higher than all other treatments. The underlying mechanisms for these results are discussed.

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Keywords

  • Biological Sciences
  • Nitrogen
  • Photosynthesis
  • Maize
  • Chlorophyll fluorescence
  • UV-B radiation

Other

Published
  • Photobiology
  • Photobiology-lup-obsolete
  • ISSN: 1161-0301
Lars Olof Björn
E-mail: lars_olof [dot] bjorn [at] biol [dot] lu [dot] se

Professor emeritus

Molecular Cell Biology

+46 46 222 72 53

B-A340

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