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Cold

Recommended Literature o o

Days after heat stress

Fig. 1.3.6. Hardening of fir needles after a heat stress treatment. Damage and hardening were measured by the photosynthetic activity of the needles. / Recovery phase after the initial heat stress treatment; 2 after the second heat stress treatment (44 °C, 30 min). The extent of damage and the length of the recovery phase (repair) are clearly less after the second stress treatment than they were upon the first heat pulse. (Larcher 1987)

Membrane "fluidity" (osmotic effects, wilting)

Protein denaturation

(T exceeding T-optimum of enzymes)

Heat damage t

Heat

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