Influence of calcium nutrition on susceptibility of rose flowers to Botrytis blight.
Volpin H. | Elad Y.
Cut rose flowers were incubated in solutions of CaCl2 or CaSO4 for 2 days and then incubated under gray mold-conducive conditions. Severity of gray mold symptoms was reduced 60% by the treatments. Results varied with calcium concentration (1-50 mM) and rose cultivar. Ca(NO3)2 was added to the nutrient solutions of rose plants grown in plots in commercial greenhouses. Other nutrients in the fertilizer solutions were constant in the different treatments. The calcium content of stems, leaves, and flowers was increased by calcium treatment in the greenhouse. Calcium at a concentration of 3.5 mM reduced the severity of postharvest Botrytis blight in naturally infected flowers by 55%, and by 30% when flowers were further inoculated before incubation under humidity conditions. Ethylene production in flowers with high calcium content was decreased by 50-95%. Increasing the potassium concentration in the fertilizer solution negated the ability of calcium to reduce Botrytis blight susceptibility of flowers, probably due to competition for cation uptake. Calcium presence in liquid medium decreased the ability of Botrytis cinerea to utilize pectate and to produce polygalacturonases by up to 100%.
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