Abstract
Thermostability of plant cells is due to the resistance of their proteins to denaturation, resistance to injurious metabolic changes, reparatory capacity, and capacity to harden. Hardiness includes the stability of several functions and increases the resistance to several injurious factors. It varies with the tissue and stage of growth. The thermostability of the proteins is constant in higher plants but changes with temperature in algae. Frost-hardening increases resistance to several injurious factors, including heat. The denaturation theory of injury satisfactorily explains some of the data.

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