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Flower color in hydrangea is well known to vary greatly. The blue color might develop with aluminum ion (Al 3+ ) from soil; the blue pigment in sepals is an Al-complex with delphinidin 3-glucoside and 5-caffeoyl quinic acid. To clarify the correlation between blue color development and Al-tolerance, flower color and metal content of the sepals were examined with reference to the reflection...
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