Effects of Light Intensity on Flower Life of Potted Delphinium Plants

概要

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Potted Delphinium hybrid 'Bellamosum' plants were held under a photosynthetic photon flux density (PPFD) of 7, 70 and 300 μmol · m-2 · s-1, their flower life, which terminated when sepal abscission occurred, was 6.4, 9.4 and 9.4 days, respectively. The capacity for CO2 assimilation on day 0 was negative at 7 μmol · m-2 · s-1. Four days after the onset of the light treatment, the concentrations of sucrose, glucose, fructose, and mannitol in sepals and gynoecia were positively correlated with light intensity. Flowers held at 7 μmol · m-2 · s-1 had a higher ethylene production on day 6, compared with flowers held at higher light intensity. The low light intensity that resulted in increased ethylene production may be attributed to the preceding reduction of CO2 assimilation and sugar content, which, in turn led to the acceleration of sepal abscission.
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