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Pre- and postclimacteric Summerred apples (Malus domestica Borkh.) were exposed for 12 h to a low concentration of atmospheric methyl jasmonate. Ethylene and volatile production were measured at harvest and through 15 days at 20 °C after treatment. Responses to methyl jasmonate treatment depended on the stage of fruit development. Methyl jasmonate stimulated ethylene, ester, alcohol, and acetic acid production in preclimacteric fruits, while little or no response was elicited from postclimacteric fruits. Ketone and aldehyde emissions were not affected by methyl jasmonate regardless of developmental stage. Keywords: Apple fruit; ripening; volatiles; methyl jasmonate

`Delicious' apple (Malus domestica Borkh.) trees received regulated deficit irrigation (RDI) early in the growing season to determine if fruit quality and storage life would he altered compared to well-watered trees. Soil moisture and leaf water potential were lower in RDI trees than in those that did not receive RDI most of the season. Internal ethylene concentration increased logarithmically earlier in RDI apples. At harvest, RDI fruit were smaller and had a higher soluble solids concentration (SSC) and lower titratable acidity. Starch degradation was delayed in RDI fruit, and their color was not affected. Firmness was not affected when the effect of size on firmness was removed. The SSC of RDI apples remained higher during storage, but starch content, titratable acidity, firmness, and color were similar.