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Regulation of petal abscission in Pelargonium x domesticum.

Deneke, C. F.; Evensen, K. B.; Craig, R.;

HortScience Year: 1990 Vol: 25 Issue: 8 Pages: 937-940 Ref: 22 ref.

1990

บทคัดย่อ

Regulation of petal abscission in Pelargonium x domesticum.

The postharvest quality of regal pelargoniums is limited by petal abscission. Six cultivars that have diverse postharvest longevities were selected to study ethylene sensitivity and endogenous ethylene production. Petals of both intact and detached inflorescences abscised in response to the application of 0.5 micro l ethylene/litre for 1 h. Ethylene sensitivity varied among cultivars and increased with floret age. Silver thiosulphate application to the intact flowers reduced ethylene sensitivity and often extended floret longevity beyond that of the controls. A climacteric-like rise in endogenous ethylene production occurred in excised gynoecia (including the receptacle) as floret age increased from 1 to 12 d postanthesis. Ethylene production increased a few days earlier and achieved a higher maximum rate in cv. Parisienne than in cv. Virginia and petals abscised earlier in Parisienne.