Measurement of the Water Potential of Intact Plant Tissues1

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Abstract
A modified design of a thermocouple psychrometer is described which utilizes the Peltier effect for producing an exceedingly small wet-bulb thermometer. The thermocouple assembly has been reduced to miniature dimensions and the thermocouple chamber consists of a silver cylinder (volume 0.06 cm3) whose base is formed by the material under observation. This makes it possible to measure water potentials over limited surfaces of intact plant tissues, e.g. germinating pea seeds (Pisum sativum L.). The apparatus is capable of measuring water potentials down to a magnitude of about –6,000 joules/kg.3

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