Photosynthetic Parameters at the Vegetative Stage and during Grain Development of Two Hexaploid Wheat Cultivars Differing in Salt Tolerance |
| |
Authors: | M Ashraf N Parveen |
| |
Institution: | (1) Department of Botany, University of Agriculture, Faisalabad, Pakistan |
| |
Abstract: | 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 |
本文献已被 SpringerLink 等数据库收录! |
|