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Environmental and Stress Physiology

Spatial D/H Heterogeneity of Leaf Water ¹

Department of Biology, University of Miami, Coral Gables, Florida 33124

The mean D value of petiole water of Pterocarpus indicus Willd (D = –9.0 ± 2.5, n = 3) was not significantly different from the mean value of stem water (–8.3 ± 2.8, n = 3). D values of main vein water ranged from –11.1 to + 12.0 (n = 14) and increased along the main vein from petiole to the tip of leaves. Mesophyll water was highly enriched in deuterium (mean D = +32.0 ± 2.0, n = 19) when compared with stem, petiole, and vein water. D values of mesophyll water for different areas of the lamina, however, were not homogenous and could differ by as much as 20.

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