Frost Resistance Characterisation of Two Mediterranean Sclerophyllous Species by Chlorophyll Fluorescence

1990

S. 141-148

2 Abb., 2 Tab., 10 Lit. Ang.

Unselbständiges Werk

200041143

Frost resistance of the photosynthetic system of 2 sclerophyllous species of the mediterranean region, Quercus ilex and Quercus coccifera, has been analysed. Measurements were made on 1 year and 1 month old leaves by the chlorophyll fluorescence induction method. Photosynthetic activity is inhibited very quickly for both the 2 species at the development stages studied. The photosynthetic system of Q. ilex seem to be the most resistant but is destroyed after half an hour of exposure to cold at -20C, without any recovery after treatment. The effect of winter temperatures on the distribution areas of Q. ilex and Q. coccifera is discussed.