Chlorophyll Fluorescence Imaging in Fruit Plant Breeding for Resistance to Dehydration and Hyperthermia

The possibility of using chlorophyll fluorescence visualization in practical apple and apricot breeding is considered. Significant influences of water deficit and heat shock on the photosynthetic activity of leaves as estimated from their fluorescent images are found. The most sensitive indicator for detecting the degree of drought-induced depression of fruit plants is confirmed to be the effective quantum yield of photosystem II.