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Environmental and Stress Physiology

Salinity Stress Increases Cytoplasmic Ca Activity in Maize Root Protoplasts ¹

Department of Land, Air, and Water Resources, University of California, Davis, California 95616, Department of Pomology, University of California, Davis, California 95616

High concentrations of NaCl immediately elevated cytoplasmic Ca activity in maize (Zea Mays L. cv Pioneer 3377) root protoplasts, as measured with the fluorescent probe Indo-1. The effect of salinity was inhibited by Li pretreatment but restored by inositol, suggesting that phosphoinositides mediate the stress response.

¹ Supported in part by a grant from the National Science Foundation (DCB-8514451) to V. S. P.

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