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Differences in water relations and physiological characteristics in leaves of wheat triticum aestivum cultivar kalyansona associated with leaf position on the plant


, : Differences in water relations and physiological characteristics in leaves of wheat triticum aestivum cultivar kalyansona associated with leaf position on the plant. Plant Physiology (Rockville) 74(4): 1041-1045

The seasonal change in leaf water potential and its components, stomatal resistance, specific leaf weight, photosynthesis rate, the activities of ribulose-1,5-bisphosphate carboxylase and nitrate reductase, and soluble proteins were measured in flag leaves (9th from base in position), 7th and 5th leaves of wheat T. aestivum L. cv. Kalyansona. Flag leaves had a lower water and solute potential and lower or equal turgor pressure than 7th and 5th leaves. These differences were independent of environment. The rate of photosynthesis and nitrate reductase activity were always lower in 5th and 7th leaves than in flag leaf. The photosynthetic efficiency in flag leaves appeared to be associated with lower stomatal resistance and higher specific leaf weight. The relations between leaf water potential and relative water content showed a change with leaf position. This change possibly allows flag leaf to maintain its funtional efficiency despite its lower water potential.

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