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FOLIARLY APPLIED OSMOTIC PRESERVATIVE CONTRIBUTES TO PEAR (PYRUS COMMINUS) LEAF AND ROOT NUTRITIONAL STATUS UNDER DROUGHT STRESS

Drought is a threat to arid and semiarid zone agriculture worldwide, its importance is better understood day by day. Fruit trees need irrigation and fertilization for yield and fruit quality and since pear trees are perennial plants their water and nutrition consumption varies compared to annual plants. Glycine betaine is an osmotic preservative that adjusts the osmotic balance within the tissues. There are a limited number of studies on the effect of glycine betaine on drought stress on leaf and root nutrient uptake of pear trees. The aim of the study was to evaluate whether foliarly-applied glycine betaine could reduce the negative effects of drought on mineral nutrition of pear tree in leaves and roots. This study was carried out in order to reveal the nutritional variations of the pear nursery trees under drought stress and to evaluate the influences of osmoprotectant applications. This study had three drought levels and four glycine betaine levels with three replications and there were three plants in each replication. Foliar GB applications are advantageous even in the regions which have drought problems and nutrient concentrations may increase under drought with glycine betaine. In general, the dose of 10 mg L -1 GB application was appropriate for pear nurseries under drought stress.