Journal Article

Isolation of cDNAs for R2R3-MYB, bHLH and WDR Transcriptional Regulators and Identification of <i>c</i> and <i>ca</i> Mutations Conferring White Flowers in the Japanese Morning Glory

Yasumasa Morita, Miho Saitoh, Atsushi Hoshino, Eiji Nitasaka and Shigeru Iida

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 47, issue 4, pages 457-470
Published in print April 2006 | ISSN: 0032-0781
Published online April 2006 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcj012
Isolation of cDNAs for R2R3-MYB, bHLH and WDR Transcriptional Regulators and Identification of c and ca Mutations Conferring White Flowers in the Japanese Morning Glory

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The transcriptional regulators for anthocyanin biosynthesis include members of proteins containing an R2R3-MYB domain, a bHLH (basic helix–loop–helix) domain and conserved WD40 repeats (WDRs). Spacial and temporal expression of the structural genes encoding the enzymes for anthocyanin biosynthesis is thought to be determined by combinations of the R2R3-MYB, bHLH and WDR factors and their interactions. While the wild-type Japanese morning glory (Ipomoea nil) exhibits blue flowers with colored stems and dark-brown seeds, the c mutants display white flowers with red stems and colored seeds, and the ca mutants exhibit white flowers with green stems and ivory seeds. Here, we characterize the tissue-specific expression of three MYB genes, three bHLH genes and two WDR genes in I. nil. We also show that the recessive c-1 and ca alleles are frameshift mutations caused by a 2 bp deletion and 7 bp insertions in the genes for the R2R3-MYB and WDR transcriptional regulators designated as InMYB1 and InWDR1, respectively. In addition to defects in flower, stem and seed pigmentations, the ca mutants were found to show reduced trichome formation in seeds but to produce leaf and stem trichomes and root hairs normally. Except for the gene for chalcone synthase E in the ca mutant, all structural genes tested were coordinately reduced in both c-1 and ca mutant flower limbs. However, slight but significant expression of the genes for chalcone synthase D, chalcone isomerase and flavanone 3-hydroxylase in the pathway for flavonol biosynthesis was detectable in c-1 and ca mutants, whereas no such residual expression could be observed in other genes involved in the later anthocyanin biosynthesis pathway. The biological roles of the C-1 and Ca genes in I. nil epidermal traits and their evolutionary implications are also discussed.

Keywords: Anthocyanin biosynthesis; Flower and seed pigmentation; Ipomoea nil; Transcriptional regulator genes; Trichome formation; ANS, anthocyanidin synthase; BFO, before flower opening; bHLH, basic helix–loop–helix; CHI, chalcone isomerase; CHS, chalcone synthase; DFR, dihydroflavonol 4-reductase; EBG, early biosynthetic gene; EST, expressed sequence tag; F3H, flavanone 3-hydroxylase; F3′H, flavonoid 3′-hydroxylase; 3GGT, UDP-glucose:anthocyanidin 3-O-glucose-2′′-O-glucosyltransferase; GST, glutathione S-transferase; 3GT, UDP-glucose:flavonoid 3-O-glucosyltransferase; HBA, Heavenly Blue anthocyanin; LBG, late biosynthetic gene; NHX, Na+/H+ exchanger; RT–PCR, reverse transcription–PCR; UTR, untranslated region; WDR, WD40 repeat

Journal Article.  9520 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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