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In 1993, we studied the postharvest behavior of 25  Rubus  genotypes. Included in the study were named cultivars from Europe and North America, advanced selections from the Univ. of Maryland Cooperative Breeding Program, species and raspberry interspecific hybrids, with  R. phenicolasius, R. pungens oldhamii R sumatranus , and  R parvifolius . Wide variation exists in the ethylene production rates of these genotypes. The difference between the lowest ethylene producer,  R. phenicolasius , and the highest ethylene evolver, HTCC-6t ( R. lasiostylus ), was four orders of magnitude. Ethylene evolution rate and percentage mold were not correlated. Ethylene production and respiration rates were also measured using a flowthrough system. No single pattern was characteristic of all genotypes. Red raspberries were the highest ethylene producers and showed an ethylene and respiratory climacteric. Blackberries were low ethylene producers. Interspecific hybrids showed varied postharvest behaviors. The behavior observed in these interspecific hybrids may explain some of the conflicting reports on the postharvest behavior of blackberries and raspberries. In general heattolerant species such as blackberry,  R. occidentalis, R. parvifolius  exhibited lower rates of respiration and ethylene evolution than species from cool, temperate areas like  R. idaeus .

Ethylene Evolution, Respiration, and Mold Development Studies in Some Selected Rubus Genotypes