Abstract
The temperate pasture grass Phalaris tuberosa L. (cvv. Australian and Sirosa) was grown in soil under glasshouse conditions. When water was withheld, leaf xylem potential (�) decreased at the rate of 0.02 and 0.05 MPa per day in cvv. Australian and Sirosa, respectively, between 7 and 17 days, and reached a dawn value -0.25 (� 0.02) MPa and -0.56 (�0.08) MPa in the respective cultivars. These plants were moderately stressed. Between 17 and 23 days, when the experiment was terminated, stress developed more rapidly and � at dawn reached final values of -2.1 (�0.09) and -2.2 (�0.08) MPa in Australian and Sirosa phalaris, respectively. These plants were severely stressed. The leaf osmotic potential (��) decreased at similar rates as � in the stressed plants, thus maintaining the turgor potential (�*p) relatively constant with increasing water stress. Osmotic adjustment (��100/�) was judged by comparing �� at full turgor (�100/�) in stressed plants which had been rewetted, with �100/� of control unstressed plants. ��100/� of moderately stressed plants was 0.46 and 0.48 MPa in Australian and Sirosa phalaris, respectively. In severely stressed plants, the respective ��100/� values were 0.67 and 0.85 MPa.
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