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- W2014863347 abstract "Colour changes in the petals of two varieties of the tropical plant species Malvaviscus arboreus were investigated. The light absorbance of living petals and the absorbance of petal-extracts were measured. A separation of pigments by means of paper chromatography was attempted. Older stages of living petals show a low absorbance at all wavelengths compared with younger ones, and also a shift of the minimum at 440 nm and the maximum at 520 nm towards higher wavelengths. Petal extracts of different stages also have a different absoiption spectrum; nonnectar producing flowers show a maximum at about 515 nm while nectar producing ones have merely a shoulder at 515 nm which may be due to a loss of red pigments. This loss is clearly demonstrated by paper chromatography and coincides with the beginning of nectar production. Hummingbirds, the main visitors of Malvaviscus, probably use this colour-shift for recognizing nectar producing flowers." @default.
- W2014863347 created "2016-06-24" @default.
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- W2014863347 date "1971-08-01" @default.
- W2014863347 modified "2023-09-26" @default.
- W2014863347 title "COLOUR CHANGE OF PETALS IN MALVAVISCUS ARBOREUS FLOWERS" @default.
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- W2014863347 doi "https://doi.org/10.1111/j.1438-8677.1971.tb00723.x" @default.
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