Photosynthetica 2017, 55(1):20-30 | DOI: 10.1007/s11099-016-0665-0

Gas-exchange parameters and morphological features of festulolium (Festulolium braunii K. Richert A. Camus) in response to nitrogen dosage

G. Mastalerczuk1, B. Borawska-Jarmu³owicz1, H. M. Kalaji2,5,*, P. D±browski3, J. Paderewski4
1 Department of Agronomy, Faculty of Agriculture and Biology, Warsaw University of Life Sciences WULS-SGGW, Warsaw, Poland
2 Department of Plant Physiology, Faculty of Agriculture and Biology, Warsaw University of Life Sciences WULS-SGGW, Warsaw, Poland
3 Department of Environmental Improvement, Faculty of Civil and Environmental Engineering, Warsaw University of Life Sciences WULS-SGGW, Warsaw, Poland
4 Department of Experimental Design and Bioinformatics, Faculty of Agriculture and Biology, Warsaw University of Life Sciences WULS-SGGW, Warsaw, Poland
5 SI Technology, Górczewska 226C/26, Warsaw, Poland

The response of some photosynthetic parameters (CO2 assimilation, transpiration rate, stomatal conductance, intercellular CO2 concentration, water-use efficiency, and chlorophyll content), shoot development, and the morphological features of the root system to differentiated conditions of nitrogen supply was tested in festulolium (Festulolium braunii K. Richert A. Camus) varieties (Felopa and Sulino). Nitrogen fertilization with no nitrogen added [0 g(N)], single dosage [0.23 g(N)], and double dosage [0.46 g(N)] per pot and per year was applied. Lack of nitrogen resulted in formation of longer and finer roots and lowered chlorophyll content, CO2 assimilation, and water-use efficiency, resulting in lower dry matter accumulation. Application of both dosages of nitrogen resulted in improved aboveground features, while root features were enhanced without nitrogen fertilization. Dependence between physiological parameters and morphological traits was significant and positively correlated in the case of the aboveground parts of plants and negatively correlated to the belowground parts.

Additional key words: CO2 assimilation; nitrogen; root diameter; specific root length

Received: April 18, 2016; Accepted: September 7, 2016; Published: March 1, 2017  Show citation

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Mastalerczuk, G., Borawska-Jarmu³owicz, B., Kalaji, H.M., D±browski, P., & Paderewski, J. (2017). Gas-exchange parameters and morphological features of festulolium (Festulolium braunii K. Richert A. Camus) in response to nitrogen dosage. Photosynthetica55(1), 20-30. doi: 10.1007/s11099-016-0665-0
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