Pressure chambers

Pressure chambers use an external pressure to measure the tension on water in the xylem of an excised leaf. The external pressure balances the tension, whereupon the xylem solution appears at the cut surface and remains steady without flow in or out of the leaf. Because the tension is the main component determining the water potential of the leaf, the method often is used as a simple, rapid measure of the leaf water potential (Boyer, 1967b).


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