Photosynthetica, 2015 (vol. 53), issue 1

Photosynthetica 2015, 53(1):47-54 | DOI: 10.1007/s11099-015-0082-9

Evaluation of photosynthetic potential of wheat genotypes under drought condition

S. Sikder1,3,*, J. Foulkes1, H. West1, J. De Silva1, O. Gaju1, A. Greenland2, P. Howell2
1 School of Biosciences, University of Nottingham, Loughborough, UK
2 National Institute of Agricultural Botany, Cambridge, UK
3 Department of Crop Physiology and Ecology, Hajee Mohammad Danesh Science and Technology University, Dinajpur, Bangladesh

Water availability is one of the most important limiting factors in agriculture worldwide, particularly in arid and semiarid regions. Six spring wheat genotypes, i.e. three UK cultivars Cadenza, Paragon, and Xi-19 and three synthetic-derived lines L-22, L-24, and L-38, were grown in a phytotron under well-watered (until 40 days after sowing) and drought conditions. The aim of the study was to evaluate the traits related to photosynthetic capacity (net photosynthesis rate, stomatal conductance, internal CO2 concentration, transpiration rate, carboxylation capacity, instantaneous and intrinsic water-use efficiency) and plant biomass production in the cultivars and synthetic derivatives of wheat genotypes under well-watered and water-limited conditions. Genotypic variations in gas-exchange traits including net photosynthetic rate, carboxylation capacity, instantaneous water-use efficiency, and biomass yield were found amongst genotypes. Drought significantly reduced the total dry matter per plant. The synthetic derivatives L-22 and L-24 showed higher performance of stomata for most of the stomatal aperture characteristics. Total dry matter was positively related to net photosynthetic rate and to instantaneous and intrinsic water-use efficiencies. Finally, net photosynthetic rate was also positively related to stomatal conductance and transpiration rate under both the well-watered and water-limited drought conditions.

Keywords: leaf gas-exchange measurements; pot experiment; water regimes

Received: September 30, 2013; Accepted: May 16, 2014; Published: March 1, 2015Show citation

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Sikder, S., Foulkes, J., West, H., Silva, J., Gaju, O., Greenland, A., & Howell, P. (2015). Evaluation of photosynthetic potential of wheat genotypes under drought condition. Photosynthetica, 53(1), 47-54. doi: 10.1007/s11099-015-0082-9.
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