EVALUATION OF THE DROUGHT RESISTANCE OF GARDEN ROSES BASED ON THE РROLINE CONTENT, WATER RETENTION CAPABILITY AND STATE OF CELL MEMBRANES UNDER THE INFLUENCE OF HYDROTHERMAL STRESS

To identify the drought resistance of seven garden roses genotypes during the period of maximum probability of drought on the Southern Coast of the Crimea, the water regime parameters, proline content and permeability of cell membranes were studied under conditions of controlled dehydration. It was revealed that different conditions of hydrothermal stress have different effects on the studied genotypes of garden roses. In relatively soft wilting conditions, after stress relief, the proline concentration decreased, reaching almost control values and permeability of cell membranes of the leaves of most of the studied objects, except Rosa gallica and Rosa chinensis var. minima, was not impaired. Under conditions of simulated dry weather, after restoration of water supply, the proline concentration and permeability of leaf cell membranes of most genotypes were increased, which indicates damage or partial death of leaf tissues. The destruction of cell membranes occurred in the leaves of the Rosa gallica species, which led to the complete death of tissues. Based on the resistance of cell membranes to destruction and cell protoplasm to dehydration, it was found that ‘Borisfen’ cv. and Rosa hugonis differ in maximum drought resistance.

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