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Variability of internal ethylene concentration as a parameter of maturity in apples.

Graell, J., Recasens, I., Salas, J. and Vendrell, M.

Acta Horticulturae Year: 1993 Issue: No. 326 Pages: 277-284 Ref: 11 ref.

1993

บทคัดย่อ

Variability of internal ethylene concentration as a parameter of maturity in apples.

It has been proposed that analysis of internal ethylene concentration (IEC) can be used to determine optimum harvest dates and to predict the potential storage life of apples in normal or controlled atmosphere. The IEC of 7 commercial apple cultivars (Starking Delicious, Idared, Red Chief, Early Red One, Golden Delicious, Royal Gala, Granny Smith) grown in Lleida province was studied, to determine its possible use as a maturity parameter in this area and its relation to other quality parameters (firmness, SS content and starch index). Different cultivars were studied over 3 seasons. In the first year (1986) the results were variable depending on the cultivar. For some cultivars, using IEC as a maturity index was possible. No significant changes were observed in IEC in other cultivars while the fruits were on the tree. However, in the cultivars that showed significant changes in IEC, the results as a whole were not confirmed in following years. Comparison between IEC and the evolution of other parameters indicated that SS content, firmness and starch index were more consistent for determining fruit development than IEC. Another aspect of the use of IEC as a maturity parameter was the variability shown by fruits of the same cultivar grown in a given area, but in different orchards. Measurement of the ethylene precursor, ACC, could be used to determine harvest maturity in some cultivars, but this was considered too complex for practical purposes.