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White flower colour is related to the absence or reduction of the anthocyanidin content.[1] Unlike other colors, white colour is not induced by pigments. Several white plant tissues are principally equipped with the complete machinery for anthocyanin biosynthesis including the expression of regulatory genes. Nevertheless, they are unable to accumulate red or blue pigments, for example Dahlia ´Seattle´ petals showing a white tip.[2] Several studies have revealed a further reduction of the anthocyanidin to colorless epicatechin by the enzyme anthocyanidin reductase (ANR).[3]
^Kazuma, Kohei; Noda, Naonobu; Suzuki, Masahiko (November 2003). "Flavonoid composition related to petal color in different lines of Clitoria ternatea". Phytochemistry. 64 (6): 1133–1139. Bibcode:2003PChem..64.1133K. doi:10.1016/s0031-9422(03)00504-1. ISSN 0031-9422. PMID 14568080.
^Rosati*, Carlo; Cadic, Alain; Duron, Michel; Renou, Jean-Pierre; Simoneau, Philippe (1997-10-01). "Molecular cloning and expression analysis of dihydroflavonol 4-reductase gene in flower organs of Forsythia × intermedia". Plant Molecular Biology. 35 (3): 303–311. doi:10.1023/A:1005881032409. ISSN 0167-4412. PMID 9349254. S2CID 9911118.
^Fischer, Thilo C.; Mirbeth, Beate; Rentsch, Judith; Sutter, Corina; Ring, Ludwig; Flachowsky, Henryk; Habegger, Ruth; Hoffmann, Thomas; Hanke, Magda-Viola (2013-10-01). "Premature and ectopic anthocyanin formation by silencing of anthocyanidin reductase in strawberry (Fragaria × ananassa)". New Phytologist. 201 (2): 440–451. doi:10.1111/nph.12528. ISSN 0028-646X. PMID 24117941.
and 28 Related for: Basics of white flower colouration information
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Don has stroke". BBC News. 22 May 2008. Retrieved 9 March 2010. "Back to basics at Gardeners' World: take two". The Telegraph. 15 January 2010. Smyth, Chris...
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