1 - 3 of 3
Number of results to display per page
Search Results
2. Enhanced water use efficiency in dry loess grassland species grown at elevated air CO2 concentration
- Creator:
- Szente, K., Nagy, Z., and Tuba, Z.
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- acclimation, gas exchange, net photosynthetic rate, stomatal conductance, and transpiration rate
- Language:
- Multiple languages
- Description:
- Net CO2 assimilation rate (PN), stomatal conductance (gs), transpiration rate (E), and water use efficiency (WUE) in four perennial C3 species (grasses: Dactylis glomerata, Festuca rupicola, dicots: Filipendula vulgaris, Salvia nemorosa) grown for 231 d in open-top chambers at ambient (CA, 350 µmol mol-1) or elevated (CE, 700 µmol mol-1) CO2 concentrations were compared. When measured at CE, PN was significantly higher in CE plants of all four species than in the CA ones. The increase in PN was less prominent in the two grasses than in the two dicots. The E was significantly higher in the CE-grass F. rupicola and CE-dicot F. vulgaris than in the CA plants. There was no change in E owing to CE in the other grass and dicot. The gs in F. vulgaris and F. rupicola increased, while there was a decrease in D. glomerata and no change in S. nemorosa. WUE increased in all species grown in CE: four- to five-fold in the dicots and less than two-fold in the grasses. The increase in WUE was primarily due to an increase in PN and not to a decrease in E. and K. Szente, Z. Nagy, Z. Tuba.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
3. Modelling net photosynthetic rate of winter wheat in elevated air CO2 concentrations
- Creator:
- Harnos, N., Tuba, Z., and Szente, K.
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- acclimation, carotenoids, chlorophyll, intercellular CO2 concentration, leaf area, net photosynthetic rate, ribulose-1,5-bisphosphate carboxylase/oxygenase capacity, temperature, and Triticum aestivum
- Language:
- Multiple languages
- Description:
- Winter wheat plants were grown in open top chambers either at 365 µmol mol-1 (AC) or at 700 µmol mol-1 (EC) air CO2 concentrations. The photosynthetic response of flag leaves at the beginning of flowering and on four vertical leaf levels at the beginning of grain filling were measured. Net photosynthetic rates (PN) were higher at both developmental phases in plants grown at EC coupled with larger leaf area and photosynthetic pigment contents. The widely accepted Farquhar net photosynthesis model was parameterised and tested using several observed data. After parameterisation the test results corresponded satisfactorily with observed values under several environmental conditions. and N. Harnos, Z. Tuba, K. Szente.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public