The response to sample injection was determined from peak height using a Hewlett Packard integrator (Model 3390 A) calibrated with external ethylene standards (B.O.C. gases,New Zealand Ltd.). Another 1 ml sample of gas was withdrawnand injected into a GC-8A Shimadzu gas liquid chromatogram for determination of CO2 concentration. Fruit skin colour was measured using a chromameter (CR-200; Minolta, Osaka, Japan) on two opposite sides of the equatorial region of fruit