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Environmental and Stress Physiology

Water Is Allocated Differently to Chloroplasts in Sun and Shade Leaves ¹

Department of Chemistry, University of Southern Mississippi, Hattiesburg, Mississippi 39406, Department of Botany, University of Wisconsin-Madison, Madison, Wisconsin 53706, Department of Biochemistry, College of Agricultural and Life Sciences, University of Wisconsin-Madison, Madison, Wisconsin 53706

Hydrogen-1 nuclear magnetic resonance spectroscopy was used to study water allocation in cell compartments of sun and shade leaves. NMR spectra of Acer platanoides were resolved into two peaks that were assigned to chloroplast and nonchloroplast water. Sun leaves contained 1.7 times more water per unit area of surface than shade leaves, and the water was allocated differently. Chloroplasts in sun leaves contained 17% of the total leaf water versus 47% in shade leaves. Comparing equal leaf surface areas, the chloroplasts in shade leaves contained 60% more water than those in sun leaves.

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				D. Capitani, F. Brilli, L. Mannina, N. Proietti, and F. Loreto In Situ Investigation of Leaf Water Status by Portable Unilateral Nuclear Magnetic Resonance Plant Physiology, April 1, 2009; 149(4): 1638 - 1647. [Abstract] [Full Text] [PDF]