Abstract
The quantitative effect of anthocyanins on the color of petals of weak pinkish and deep pinkish rose cultivars was investigated, and results were compared with the data previously obtained on red petals.The major pigment in those petals was identified as cyanin by paper chro-matography. Cyanin contents were: 1.5-1.0μg/cm2 in weak pinkish petals, and 20-..80 μg/cm2 in deep pinkish ones (cf. 100-900 μg/cm2 in red petals, as reported previously3)).Chromaticity coordinates (x, y) were calculated from the transmittance curves for pigment solutions containing different amounts of cyanin, and also from the reflectance curves for the petals of cultivars used.From the correlation between the colorimetric data and the cyanin contents in pigment extracts or petals, the following possibilities may be considered:1) Visible color difference between pinkish and red petals seems to be determined by difference in cyanin content in the petals.2) Color difference between deep pinkish petals and weak pinkish or red ones can not be ascribed solely to the quantitative effect of cyanin alone; in addition a bluing effect must take a part in the development of deep pinkish color in rose petals.
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