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

Correia, Carlos M.; Moutinho Pereira, José M.; Coutinho, João F.; Björn, Lars Olof LU and Torres-Pereira, José M. G. (2005) In European Journal of Agronomy 22(3). p.337-347
Abstract
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... (More)
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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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Nitrogen, Photosynthesis, Maize, Chlorophyll fluorescence, UV-B radiation
in
European Journal of Agronomy
volume
22
issue
3
pages
337 - 347
publisher
Elsevier
external identifiers
  • wos:000227635200009
  • scopus:13844281627
ISSN
1161-0301
DOI
10.1016/j.eja.2004.05.002
project
Photobiology
language
English
LU publication?
yes
id
0c3d5daa-348d-49a4-99c6-a0c4de23cbb0 (old id 135343)
date added to LUP
2007-07-30 14:13:31
date last changed
2017-09-10 03:36:18
@article{0c3d5daa-348d-49a4-99c6-a0c4de23cbb0,
  abstract     = {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. <br/><br>
This is the final, accepted and revised manuscript of this article. Use alternative location to go to the published article. Requires subscription.},
  author       = {Correia, Carlos M. and Moutinho Pereira, José M. and Coutinho, João F. and Björn, Lars Olof and Torres-Pereira, José M. G.},
  issn         = {1161-0301},
  keyword      = {Nitrogen,Photosynthesis,Maize,Chlorophyll fluorescence,UV-B radiation},
  language     = {eng},
  number       = {3},
  pages        = {337--347},
  publisher    = {Elsevier},
  series       = {European Journal of Agronomy},
  title        = {Ultraviolet-B radiation and nitrogen affect the photosynthesis of maize: a Mediterranean field study},
  url          = {http://dx.doi.org/10.1016/j.eja.2004.05.002},
  volume       = {22},
  year         = {2005},
}