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Articles

Water Potential in Excised Leaf Tissue

Comparison of a Commercial Dew Point Hygrometer and a Thermocouple Psychrometer on Soybean, Wheat, and Barley ^{1 ,2}

Michigan State University/Energy Research and Development Administration Plant Research Laboratory and Department of Botany and Plant Pathology, Michigan State University, East Lansing, Michigan 48824

Leaf water potential (_leaf) determinations were made on excised leaf samples using a commercial dew point hygrometer (Wescor Inc., Logan, Utah) and a thermocouple psychrometer operated in the isopiestic mode. With soybean leaves (Glycine max L.), there was good agreement between instruments; equilibration times were 2 to 3 hours. With cereals (Triticum aestivum L. and Hordeum vulgare L.), agreement between instruments was poor for moderately wilted leaves when 7-mm-diameter punches were used in the hygrometer and 20-mm slices were used in the psychrometer, because the _leaf values from the dew point hygrometer were too high. Agreement was improved by replacing the 7-mm punch samples in the hygrometer by 13-mm slices, which had a lower cut edge to volume ratio. Equilibration times for cereals were normally 6 to 8 hours. Spuriously high _leaf values obtained with 7-mm leaf punches may be associated with the ion release and reabsorption that occur upon tissue excision; such errors evidently depend both on the species and on tissue water status.

² Cooperative investigation of the MSU-ERDA Plant Research Laboratory and Michigan Agricultural Experiment Station. Michigan Agricultural Experiment Station Journal Article No. 8061.

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