Winter Stress And Chlorophyll Fluorescence in Norway Spruce (Picea abies, L., Karst.)
Winter stress induces loss of photosynthetic capacity in at least two ways: 1.) At freezing temperatures below -4° C the photosynthetic membranes were disintegrated. 2.) Chilling temperatures enhance the sensitivity for photoinhibition. Fast kinetics of chlorophyll fluorescence induction (FV/Fm = Fm-F0/Fm; Fm = P) provide adequate means to assess the photosynthetic capacity of a plant.
Samples from the experimental garden (Vienna) and from three sites in the alpine region (Zillertal) were measured with a microscopic fluorimeter and additionally with a portable fluorimeter. Freezing temperatures induce a marked loss of FV/Fm independently of incident light-intensities. FV/Fm also declined if chilling temperatures are combined with high light-intensities. Chilling temperatures are combined with low light had no photoinhibitory effect. Therefore, shaded and snow covered branches are protected against light stree.
Chlorophyll flourescence is a sensitive tool to detect stress phenomena as well as a measuring device which is manageable even under unfavourable climatic conditions.
Key wordsfluorescence induction winter stress photoinhibition Picea abies
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