GEPHE SUMMARY Print
Gephebase Gene
Entry Status
Published
GepheID
GP00000091
Main curator
Martin
PHENOTYPIC CHANGE
Trait Category
Trait State in Taxon A
Petunia integrifolia
Trait State in Taxon B
Petunia axillaris
Ancestral State
Data not curated
Taxonomic Status
Taxon A
Common Name
-
Synonyms
violet-flowered petunia; Petunia integrifolia (Hook.) Schinz & Thell., 1915
Rank
species
Lineage
Show more ... tina; Embryophyta; Tracheophyta; Euphyllophyta; Spermatophyta; Magnoliophyta; Mesangiospermae; eudicotyledons; Gunneridae; Pentapetalae; asterids; lamiids; Solanales; Solanaceae; Petunioideae; Petunia
NCBI Taxonomy ID
is Taxon A an Infraspecies?
No
Taxon B
Common Name
-
Synonyms
large white petunia; white moon petunia; Petunia axillaris (Lam.) Britton, Stern & Poggenb.; Petunia axilliaris
Rank
species
Lineage
Show more ... tina; Embryophyta; Tracheophyta; Euphyllophyta; Spermatophyta; Magnoliophyta; Mesangiospermae; eudicotyledons; Gunneridae; Pentapetalae; asterids; lamiids; Solanales; Solanaceae; Petunioideae; Petunia
NCBI Taxonomy ID
is Taxon B an Infraspecies?
No
GENOTYPIC CHANGE
Generic Gene Name
AN2
Synonyms
-
String
-
Sequence Similarities
-
GO - Biological Process
-
GO - Cellular Component
UniProtKB
Petunia integrifolia
GenebankID or UniProtKB
Presumptive Null
Yes
Molecular Type
Aberration Type
SNP
SNP Coding Change
Nonsense
Molecular Details of the Mutation
W196*
Experimental Evidence
Taxon A Taxon B Position
Codon - - -
Amino-acid - - -
Authors
Quattrocchio F; Wing J; van der Woude K; Souer E; de Vetten N; Mol J; Koes R
Abstract
The shape and color of flowers are important for plant reproduction because they attract pollinators such as insects and birds. Therefore, it is thought that alterations in these traits may result in the attraction of different pollinators, genetic isolation, and ultimately, (sympatric) speciation. Petunia integrifolia and P. axillaris bear flowers with different shapes and colors that appear to be visited by different insects. The anthocyanin2 (an2) locus, a regulator of the anthocyanin biosynthetic pathway, is the main determinant of color differences. Here, we report an analysis of molecular events at the an2 locus that occur during Petunia spp evolution. We isolated an2 by transposon tagging and found that it encodes a MYB domain protein, indicating that it is a transcription factor. Analysis of P. axillaris subspecies with white flowers showed that they contain an2(-) alleles with two alternative frameshifts at one site, apparently caused by the insertion and subsequent excision of a transposon. A third an2(-) allele has a nonsense mutation elsewhere, indicating that it arose independently. The distribution of polymorphisms in an2(-) alleles suggests that the loss of an2 function and the consequent changes in floral color were not the primary cause for genetic separation of P. integrifolia and P. axillaris. Rather, they were events that occurred late in the speciation process, possibly to reinforce genetic isolation and complete speciation.
Additional References
RELATED GEPHE
Related Genes
Related Haplotypes
5
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