Effects of light intensity on flower life of potted Delphinium plants
2005
Tanase, K. | (National Inst. of Floricultural Science, Tsukuba, Ibaraki (Japan)) | Uhsio, A. | Ichimura, K.
Potted Delphinium hybrid 'Bellamosum' plants were held under a photosynthetic photon flux density (PPFD) of 7, 70 and 300 mumol¥m(-2).(-1), their flower life, which terninated when sepal abscission occurred, was 6.4, 9.4 and 9.42 days, respectively. The capacity for CO2 assimilation on day 0 was negative at 7 mumol¥m(-2).S (-1). Four days after the onset of the light treatment, the concentrations of sucrose, glucose, fructose, and mannitol in s2epalsl and gynoecia were positively correlated with light intensity. Flowers held at 7 mumol 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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