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Effect of molybdenum on the flower color of platycodon grandiflorum cultivar samidare


Journal of the Japanese Society for Horticultural Science 52(2): 174-179
Effect of molybdenum on the flower color of platycodon grandiflorum cultivar samidare
The effect of sodium molybdate on changing the flower color of balloon flowers, P. grandiflorum A.DC. cv. Samidare was studied. When the cut flowers were held in the Mo solutions (0, 2.5, 5 and 10 mM), the flower color change from blue-violet to blue was enhanced with increasing Mo concentration. Spraying of Mo solutions (0, 2.5, 5, 10 and 20 mM) to the flowers of potted plants had a bluing effect similar to Mo uptake by cut flowers. Damage from Mo treatments appeared at concentrations of 10 mM in the former and 20 mM in the latter. Main absorption maximum of the fresh petals of cut flowers held in the Mo solution shifted toward a longer wavelength and increased in absorbance. Similar spectral change was exhibited upon in vitro addition of molybdate ions to anthocyanin solution. This bluing effect due to Mo addition decreased with subsequent addition of a chelating agent, EDTA. The bluing of balloon flowers caused by Mo uptake seems to be due to the formation of metallo-anthocyanin in pigment cells.


Accession: 005254829



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