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Environmental and Stress Physiology

Thermal Damage to Chloroplast Envelope Membranes ¹

Department of Chemistry, University of Southern Mississippi, Hattiesburg, Mississippi 39406, Department of Botany, University of Wisconsin, Madison, Wisconsin 53706, Department of Biochemistry, University of Wisconsin, Madison, Wisconsin 53706

Nuclear magnetic resonance was used to detect thermal injury to chloroplasts in vivo. A lesion occurs in the chloroplast envelope membrane at temperatures between 53°C and 57°C, depending on species, leaf condition, and heating rate. The injury is associated with a sudden loss of water from the chloroplast.