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Plant Physiology 49:944-949 (1972)
© 1972 American Society of Plant Biologists

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A Condensation Type Porometer for Field Use 1

S. Moreshet2 and C. S. Yocum3

a Missouri Botanical Garden, St. Louis, Missouri 63110

A double cup transpiration porometer is described which simultaneously measures the resistance to water vapor diffusion from the upper and lower epidermises of a leaf. In use the cups are dried, the porometer is clamped on the leaf, and the transit time required for water vapor to condense on a cold (0 C) reflective surface in each cup is recorded. Since the sensing element remains at constant temperature, only transit time and leaf temperature are required to calculate leaf resistance.

2 Present address: Department of Agricultural Meteorology, Volcani Institute of Agricultural Research, P. O. Box 6, Bet-Dagan, Israel.

3 Present address: Department of Botany, University of Michigan, Ann Arbor, Mich. 48104.

1 This work was supported by a grant from The Ford Foundation to Dr. D. M. Gates.






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ASPB Publications PLANT PHYSIOLOGY THE PLANT CELL
Copyright © 1972 by the American Society of Plant Biologists