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• W4386388612 endingPage "108000" @default.
• W4386388612 startingPage "108000" @default.
• W4386388612 abstract "Several R2R3-MYB genes control anthocyanin pigmentation in petunia, and ANTHOCYANIN-2 (AN2) is treated as the main player in petal limbs. However, the actual roles of R2R3-MYBs in the coloration of different floral tissues in the so called darkly-veined petunias are still not clear. The genetic background and expression of AN2 paralogs from various petunias with different color patterns were identified. All darkly-veined genotypes have the identical mutation in the AN2 gene, but express a different functional paralog - ANTHOCYANIN-4 (AN4) - abundantly in flowers. Constitutive overexpression of PhAN4 in this petunia resulted not only in a fully colored flower but also in a clearly visible pigmentation in the green tissue and roots, which can be rapidly increased by stress conditions. Suppression of AN4 gene resulted in discolored petals and whitish anthers. Interestingly, when a similar white flower phenotype was achieved by knockout of an essential structural gene of anthocyanin biosynthesis - CHALCONE ISOMERASE-A (CHI-A) - the plant responded directly by upregulating of another paralogs - DEEP PURPLE (DPL) and PURPLE HAZE (PHZ). Moreover, we also found that CHI-B can partially substitute for CHI-A in anthers, but not in vegetative tissues. Further, no significant effects on the longevity of white or enhanced colored flowers were observed compared with the wild type. We concluded that endogenous up-regulation of AN4 leads to the restoration of petal color in the darkly-veined phenotypes as a result of the breeding process under human selection, and CHI-B is a backup for CHI-A acitvity in some floral tissues." @default.
• W4386388612 created "2023-09-03" @default.
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• W4386388612 date "2023-10-01" @default.
• W4386388612 modified "2023-09-27" @default.
• W4386388612 title "New insights into the genetic manipulation of the R2R3-MYB and CHI gene families on anthocyanin pigmentation in Petunia hybrida" @default.
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• W4386388612 doi "https://doi.org/10.1016/j.plaphy.2023.108000" @default.
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