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• W49405836 abstract "The maize pericarp colorl (pi) gene encodes an R2R3 Myb-like transcription factor that regulates the flavonoid biosynthetic pathway in floral organs, most notably kernel pericarp and cob. Alleles of the pi gene condition distinct tissue-specific pigmentation patterns; to elucidate the molecular basis of these allele-specific expression patterns, we characterized two novel Pl-rw (red pericarp/white cob) alleles, Pl-rw1077 and Pirw751::Ac. Structural analysis of Pl-rwl077 indicated that this allele was generated by recombination between pi and the tightly linked paralogous gene, p2. In the resulting gene, the pi coding sequence was replaced by the p2 coding sequence, while the flanking pi regulatory sequences remained largely preserved. The red pericarp color specified by Plrw 1077 suggests that the piand -encoded proteins are functionally equivalent as regulatory factors in the flavonoid biosynthesis pathway. Sequence analysis shows that the Pl-rwl077 allele lacks a 386 bp sequence in a distal enhancer region 5 kb upstream of the transcription start site. An independently-derived Pl-rw allele contains an Ac insertion into the same sequence, indicating that this site likely contains cob glume-specific regulatory elements. The pi alleles exhibit a high degree of genetic and phenotypic diversities. To understand the driving force(s) for generation of those diversities as well as the evolutionary history of the pi locus, 6 single copy natural pi alleles, including 4 new pi alleles and the previously cloned Pl-rr4B2 and Pl-rw1077 alleles, were characterized and compared. Structural and sequence analyses revealed 3 distinctive types of the distal enhancer in these alleles. The structure of the distal enhancer region correlates with the expression of each allele in cob glumes. Further investigation suggested that homologous recombination" @default.
• W49405836 created "2016-06-24" @default.
• W49405836 creator A5052274720 @default.
• W49405836 date "2018-08-13" @default.
• W49405836 modified "2023-09-27" @default.
• W49405836 title "Organ-specific regulation and molecular evolution of the maize pericarp color1 gene" @default.
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• W49405836 doi "https://doi.org/10.31274/rtd-180813-301" @default.
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