Water relations, gas exchange characteristics, and the level of some metabolites in two cultivars of spring wheat under different N regimes |
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Authors: | M Ashraf M Arfan M Y Ashraf |
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Institution: | (1) Department of Botany, University of Agriculture, Faisalabad, Pakistan;(2) Nuclear Institute for Agriculture and Biology (NIAB), Faisalabad, Pakistan |
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Abstract: | Twenty eight-day old plants of two spring wheat cultivars differing in salinity tolerance were subjected to varying levels
of nitrogen (56, 112, and 224 mg N·kg−1 soil) for 42 days. Both cultivars performed differently under varying soil N levels in terms of growth, and grain yield and
yield components. Nitrogen levels, 112 and 224 mg·kg−1 soil, caused maximal growth in Sarsabz and Barani-83, respectively. Cv Sarsabz maintained higher leaf water and turgor potentials,
but lower leaf osmotic potential than those of Barani-83 at all external N regimes. Sarsabz had higher Chl a, Chl b and carotenoids contents in leaves than those in Barani-83 at 56 and 112 mg N·kg−1 soil. Sarsabz had higher contents of leaf soluble proteins, soluble sugars, and free amino acids than those in Barani-83
at all external N levels. In Barani-83 net CO2 assimilation rate remained almost unchanged, whereas in Sarsabz it decreased consistently with increase in external N level.
The better growth performance of Sarsabaz as compared to Barani-83 under varying soil N levels except 224 mg N·kg−1 soil was associated with maintenance of high leaf turgor potential but not with net CO2 assimilation rate. |
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Keywords: | chlorophyll contents photosynthesis nitrogen fertilization water potential wheat |
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