Abstract
The time to visible senescence (wilting) in open florets of a diploid line of Dendrobium ‘Caesar’ was shorter than that in a tetraploid line. Diploid flowers showed higher rates of respiration. Tetraploid flowers had thicker petals and higher fresh and dry weight. In both lines, a preservative solution containing 225 mg l −1 8-hydroxyquinoline sulfate (HQS), 30 mg l −l AgNO 3 and 4% glucose increased bud opening and the time to wilting of the open florets. Flowers on inflorescences with flower buds had a shorter life than flowers on inflorescences without buds. The latter showed a higher rate of respiration. The results indicate that carbohydrate levels limit the life of open florets and that the longer life of open tetraploid florets is, at least partially, due to their lower rate of respiration.
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