Abstract

In this study, we used poplar as a model plant and investigated the effects of gaseous nitrogen dioxide (NO2, 4 mu l l(-1)) on stomatal conductance, photosynthesis, dark-and photorespiration of Populus alba 9 Populus berolinensis hybrid leaves using the photosynthesis system and scanning electron microscope technique. The results showed that net photosynthetic rates were significantly reduced in leaves exposed to 4 mu l l(-1) NO2 for 48 h as compared with leaves exposed to ambient carbon dioxide 380 mu l l(-1) and ambient NO2 <0.1 mu l l(-1) (the control) and the leaves exposed for 14 h. The decline of net photosynthetic rate was caused mainly by NO2 treatment. Dark respiration rates were dependent on co-action of the two factors (leaf temperature and NO2 treatment time). Postillumination carbon dioxide burst in the exposed leaves occurred at 13-15 s after turning the light off, whereas this phenomenon was absent in the control leaves.

Keywords

Nitrogen dioxide; Photorespiration; Populus trees; Post-illumination CO2 burst; Stomatal behavior

Published in

Acta Physiologiae Plantarum
2015, Volume: 37, number: 2, article number: UNSP 39
Publisher: SPRINGER HEIDELBERG

SLU Authors

• Tigabu, Mulualem

  • Southern Swedish Forest Research Centre, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Forest Science


Publication identifier

DOI: https://doi.org/10.1007/s11738-014-1749-8

Permanent link to this page (URI)

https://res.slu.se/id/publ/72383