Factors Determining Petal Colour of Baccara Roses II: THE EFFECT OF PIGMENT CONCENTRATION |
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Authors: | BIRAN, I. ROBINSON, M. HALEVY, A. H. |
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Abstract: | Blueing in young and senescing petals was comparedin the red rose cv. Baccara. The blueing of senescingflowers is accompanied by a bathochromic shift in the lightreflectance curve, a rise in the pH value and a decrease inthe malic acid concentration of the petal tissue. These factorsindicate that a complex with a co-pigment is produced. Similarchanges were not found in the blueing of youngflowers, where a decrease was found in pigment concentrationper unit weight as well as per unit area of petal. A similarblueing was achieved by diluting a solution ofcrystalline cyanin. The phenomenon of blueingby dilution is discussed in the light of Bougeur's law. |
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