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Cyanidin-based anthocyanin was detected in violet-blue color Phalaenopsis and was concomitant with a high pH value and high molar ratio of Al³⁺, Ca²⁺ and Fe³⁺ to anthocyanin content. Enhanced expression of delphinidin is needed to produce true-blue Phalaenopsis.
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Liang et al. (2020) studied this question.
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