biologia plantarum

International journal on Plant Life established by Bohumil Nìmec in 1959

Biologia plantarum 45:401-407, 2002 | DOI: 10.1023/A:1016221801887

Photosynthetic Parameters at the Vegetative Stage and during Grain Development of Two Hexaploid Wheat Cultivars Differing in Salt Tolerance

M. Ashraf1, N. Parveen1
1 Department of Botany, University of Agriculture, Faisalabad, Pakistan

Response of two spring wheat (Triticum aestivum L.) cultivars, salt tolerant SARC-I and salt sensitive Potohar, to different concentrations of NaCl was examined under glasshouse conditions. Eighteen-day-old plants of both the lines grown in sand culture were irrigated with 0 (control), 80, 160 or 240 mM NaCl in full strength Hoagland's nutrient solution. Shoot fresh and dry masses, and leaf area per plant of SARC-I at the vegetative stage, were significantly greater than those of cv. Potohar at higher salt concentrations, however, relative growth rate (RGR) of cv. Potohar was significantly higher than that of SARC-I. SARC-I had higher net photosynthetic rate (PN), stomatal conductance (gs) and transpiration rate (E) than cv. Potohar at the vegetative stage, but the cultivars did not differ significantly in water-use efficiency (PN/E), intrinsic water use efficiency (PN/gs), and intercellular/ambient CO2 concentration ratio. At the grain development stage, SARC-I had significantly higher PN and gs in the flag leaf than cv. Potohar under salinity. SARC-I was superior to cv. Potohar with respect to number of grains per spike, number of grains per spikelet, mean grain mass, and grain yield per plant at all NaCl concentrations.

Keywords: salinity; stomatal conductance; transpiration; Triticum aestivum; water use efficiency
Subjects: cultivar differences; gas exchange, development, salt tolerance; gas exchange, ontogeny, salt tolerance; ontogeny, leaf age; ploidy, photosynthesis, salt tolerance; salt stress, photosynthesis, photochemical activity, chlorophyll; stomatal conductance, photosynthesis, salt tolerance; transpiration, photosynthesis, development, salt tolerance; Triticum aestivum; water use efficiency, ontogeny, salt tolerance

Published: September 1, 2002  Show citation

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Ashraf, M., & Parveen, N. (2002). Photosynthetic Parameters at the Vegetative Stage and during Grain Development of Two Hexaploid Wheat Cultivars Differing in Salt Tolerance. Biologia plantarum45(3), 401-407. doi: 10.1023/A:1016221801887
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