Abstract
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.
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Abbreviations
- B:
-
total dry biomass of plants
- Chl:
-
chlorophyll
- C i :
-
intercellular CO2 concentration
- D:
-
average diameter of roots
- DAS:
-
days after sowing
- DD:
-
double dose
- E :
-
transpiration rate
- g s :
-
stomatal conductance
- LN:
-
leaf number
- P N :
-
net photosynthetic rate
- RDM:
-
root dry mass
- RL:
-
total length of roots
- R/S:
-
root/shoot ratio
- SA:
-
surface area of roots
- SD:
-
single dose
- SDM:
-
shoot dry mass
- SN:
-
shoot number
- SPAD:
-
leaf greenness index
- SRL:
-
specific root length
- WUE:
-
water-use efficiency
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Mastalerczuk, G., Borawska-Jarmułowicz, B., Kalaji, H.M. et al. Gas-exchange parameters and morphological features of festulolium (Festulolium braunii K. Richert A. Camus) in response to nitrogen dosage. Photosynthetica 55, 20–30 (2017). https://doi.org/10.1007/s11099-016-0665-0
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DOI: https://doi.org/10.1007/s11099-016-0665-0