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Effects of carbohydrate and water status on flower opening of cut Madelon roses

, : Effects of carbohydrate and water status on flower opening of cut Madelon roses. Postharvest Biology and Technology 1(1): 47-57

Flowering stems of "˜Madelon" roses (Rosa hybrida L.) severed from the intact plant at the commercially recommended cutting stage and placed in water showed little growth of the corolla and virtually no flower opening. Inclusion of sucrose and an antimicrobial compound in the solution resulted in growth and opening as in unsevered flowers. Flowers placed in water without antimicrobial compounds had a low water potential as a result of vascular blockage in the lowermost segment of the stem. The decrease in water potential was correlated with inhibition of corolla growth and flower opening. The negative effect of water potential on growth and opening was independent of the positive effect of sucrose. Flower opening of "˜Sonia" roses, cut at the same stage as "˜Madelon" roses, was as in unsevered flowers. The level of starch in the corolla of "˜Sonia" roses was twice as high as in "˜Madelon" roses. "˜Madelon" roses cut at a later stage of development contained more corolla starch than those cut earlier and both growth and opening were no longer inhibited. The data suggest that the poor opening of cut "˜Madelon" roses was initially due to relatively low levels of reserve carbohydrates in the corolla while later it was partially due to a low water potential.


DOI: 10.1016/0925-5214(91)90018-7

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