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Water Relations of Cadmium-Treated Plants¹

ABSTRACT

Turgor pressures, stomatal resistances, and transpiration rates were measured during a 50-day period in leaves of chrysanthemum (Chrysanthemum morifolium Ramat. ‘Indianapolis White’) plants grown in nutrient solution with 0, 0.01, 0.1, and 1.0 µg/ml Cd added as CdSO₄. At harvest, dry weight and Cd concentrations in roots, stems, and leaves were determined. Leaf abscission occurred on Cd-treated plants. Turgor pressures were highest in plants grown with 0.01 µg/ml Cd and lower in plants treated with 0, 0.1, and 1.0 µg/ml Cd. Stomatal resistances were lowest in plants grown with 0.01 µg/ml Cd and progressively higher in plants treated with 0, 0.1, and 1.0 µg/ml Cd. Results indicated that quantities of Cd permitted in irrigation water in the United States (0.05 µg/ml) might be detrimental to growth because of reduced turgor pressure and increased stomatal resistance.

Key Words: water potential • osmotic potential • turgor pressure • stomatal resistance • Chrysanthemum morifolium

¹ J. article no. 2035 of the Agric. Exp. Stn., Univ. of Mass., Amherst, MA 01002.

² Assistant Professor, Dep. of Agronomy, Oklahoma State Univ., Stillwater, OK 74074.

Received for publication May 2, 1977.

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