GEPHE SUMMARY Print
Gephebase Gene
Entry Status
Published
GepheID
GP00002086
Main curator
Courtier
PHENOTYPIC CHANGE
Trait Category
Trait State in Taxon A
fully purple flowers and dark-brown seeds
Trait State in Taxon B
pale‐reddish flowers with fine red spots or sectors and ivory seeds with tiny dark‐brown spots
Ancestral State
Taxon A
Taxonomic Status
Taxon A
Common Name
common morning-glory
Synonyms
Convolvulus purpureus; Pharbitis purpurea; common morning-glory; Convolvulus purpureus L., 1762; Ipomoea purpurea (L.) Roth, 1787; Pharbitis purpurea (L.) Voigt, 1845; Pharbits purpurea
Rank
species
Lineage
Show more ... ina; Embryophyta; Tracheophyta; Euphyllophyta; Spermatophyta; Magnoliophyta; Mesangiospermae; eudicotyledons; Gunneridae; Pentapetalae; asterids; lamiids; Solanales; Convolvulaceae; Ipomoeeae; Ipomoea
NCBI Taxonomy ID
is Taxon A an Infraspecies?
No
Taxon B
Common Name
common morning-glory
Synonyms
Convolvulus purpureus; Pharbitis purpurea; common morning-glory; Convolvulus purpureus L., 1762; Ipomoea purpurea (L.) Roth, 1787; Pharbitis purpurea (L.) Voigt, 1845; Pharbits purpurea
Rank
species
Lineage
Show more ... ina; Embryophyta; Tracheophyta; Euphyllophyta; Spermatophyta; Magnoliophyta; Mesangiospermae; eudicotyledons; Gunneridae; Pentapetalae; asterids; lamiids; Solanales; Convolvulaceae; Ipomoeeae; Ipomoea
NCBI Taxonomy ID
is Taxon B an Infraspecies?
Yes
Taxon B Description
ivs‐stb1 line WR4
GENOTYPIC CHANGE
Presumptive Null
Yes
Molecular Type
Aberration Type
Insertion Size
100-999 bp
Molecular Details of the Mutation
insertion of 838 bp IpMu1 in exon 2
Experimental Evidence
Authors
Park KI; Ishikawa N; Morita Y; Choi JD; Hoshino A; Iida S
Abstract
The transcriptional regulators for anthocyanin pigmentation include proteins containing R2R3-MYB domains, bHLH domains and conserved WD40 repeats, and their interactions determine the set of genes to be expressed. Spontaneous ivory seed (ivs) mutants of Ipomoea purpurea displaying pale pigmented flowers and ivory seeds are caused by insertions of DNA transposons into the bHLH2 gene that encodes a bHLH transcriptional regulator. A partial reduction in the expression of all structural genes encoding enzymes for anthocyanin biosynthesis was observed in the young flower buds of these ivs mutants. The DFR-B and ANS transcripts were completely abolished in the ivs seed coats, whereas the early biosynthetic genes for flavonol biosynthesis remained active. The production and accumulation of both proanthocyanidin and phytomelanin pigments in the ivory seed coats were drastically reduced. Moreover, the unbranched trichomes in the ivory seeds were smaller in size and fewer in number than those in the wild-type dark-brown seeds, and the surface of the epidermis without trichomes in the dark-brown seeds looked rougher, due to the protruding tangential walls, than that in the ivory seeds. Although the I. purpurea bHLH2 gene is the most closely related to the petunia AN1 gene, whose mutation is known to confer white flowers and to be deficient in acidification of their vacuoles, the vacuolar alkalization in the epidermal flower limbs of I. purpurea ivs mutants appears to occur normally. These results are discussed with regard to the function of bHLH transcriptional regulators controlling flower and seed pigmentation as well as other epidermal traits.
Additional References
RELATED GEPHE
EXTERNAL LINKS
COMMENTS
@TE - The I. purpurea bHLH2 gene is the most closely related to the petunia AN1 gene.
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