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Chlorophyll fluorescence of long English cucumber affected by storage conditions.

Lin, W. C.; Jolliffe, P. A.;

Acta Horticulturae Year: 2000 Issue: No. 517 Pages: 449-453 Ref: 16 ref.

2000

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Chlorophyll fluorescence of long English cucumber affected by storage conditions.

Greenhouse-grown cucumber (cv. Mustang) fruits were harvested and subjected to various storage treatments (storage temperatures of 1, 13 or 22 deg C; desiccation for 5 h, or wrapped to prevent desiccation, during storage at 13 deg C) in two experiments. Fruits were then held in darkness for 1 h before chlorophyll fluorescence was measured. In the first experiment, stored cucumbers showed a rapid decline in non-variable fluorescence (Fo), maximal fluorescence (Fm) and variable fluorescence (Fv) over 2 days, regardless of the storage temperature. The Fv/Fm declined in 6 days at 1 deg C, 19 days at 13 deg C, and 14 days at 22 deg C. Similarly, Fv/Fo declined over 6 days at 1 deg C, 19 days at 13 deg C, and 16 days at 22 deg C. In the second experiment, cucumber fruits stored at 13 deg C had lower Fo and Fm after 1 day, and these parameters continued to decline thereafter. Fv/Fm and Fv/Fo at 13 deg C increased on 1 day, and then declined towards the end of storage. Desiccation during 13 deg C storag

e resulted in low Fo, high Fv/Fm and Fv/Fo. The measurement of chlorophyll fluorescence can be a useful tool in monitoring senescence, temperature stress, and desiccation during storage. Under some circumstances, some fluorescence parameters may be used as quality indicators for postharvest handling procedures of greenhouse cucumbers.