Japanese morning glory dusky mutants displaying reddish-brown or purplish-gray flowers are deficient in a novel glycosylation enzyme for anthocyanin biosynthesis, UDP-glucose:anthocyanidin 3-O-glucoside-2''-O-glucosyltransferase, due to 4-bp insertions in the gene.

@article{Morita2005JapaneseMG,
  title={Japanese morning glory dusky mutants displaying reddish-brown or purplish-gray flowers are deficient in a novel glycosylation enzyme for anthocyanin biosynthesis, UDP-glucose:anthocyanidin 3-O-glucoside-2''-O-glucosyltransferase, due to 4-bp insertions in the gene.},
  author={Yasumasa Morita and Atsushi Hoshino and Yasumasa Kikuchi and Hiroaki Okuhara and E. Ono and Yoshikazu Tanaka and Yuko Fukui and Norio Sait{\^o} and Eiji Nitasaka and Hiroshi Noguchi and Shigeru Iida},
  journal={The Plant journal : for cell and molecular biology},
  year={2005},
  volume={42 3},
  pages={353-63}
}
Bright blue or red flowers in the Japanese morning glory (Ipomoea nil) contain anthocyanidin 3-O-sophoroside derivatives, whereas the reddish-brown or purplish-gray petals in its dusky mutants accumulate anthocyanidin 3-O-glucoside derivatives. The Dusky gene was found to encode a novel glucosyltransferase, UDP-glucose:anthocyanidin 3-O-glucoside-2''-O-glucosyltransferase (3GGT), which mediates the glucosylation of anthocyanidin 3-O-glucosides to yield anthocyanidin 3-O-sophorosides. Ipomoea… CONTINUE READING
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