GEPHE SUMMARY
Gephebase Gene
Entry Status
Published
GepheID
GP00001272
Main curator
Arnoult
PHENOTYPIC CHANGE
Trait Category
Trait State in Taxon A
Arabidopsis thaliana- Col-0 and other lines
Trait State in Taxon B
Arabidopsis thaliana- Dja-1
Ancestral State
Data not curated
Taxonomic Status
Taxon A
Common Name
thale cress
Synonyms
thale cress; mouse-ear cress; thale-cress; Arabidopsis thaliana (L.) Heynh.; Arabidopsis thaliana (thale cress); Arabidopsis_thaliana; Arbisopsis thaliana; thale kress
Rank
species
Lineage
Show more ... ; Embryophyta; Tracheophyta; Euphyllophyta; Spermatophyta; Magnoliophyta; Mesangiospermae; eudicotyledons; Gunneridae; Pentapetalae; rosids; malvids; Brassicales; Brassicaceae; Camelineae; Arabidopsis
NCBI Taxonomy ID
is Taxon A an Infraspecies?
Yes
Taxon A Description
Arabidopsis thaliana- Col-0 and other lines
Taxon B
Common Name
thale cress
Synonyms
thale cress; mouse-ear cress; thale-cress; Arabidopsis thaliana (L.) Heynh.; Arabidopsis thaliana (thale cress); Arabidopsis_thaliana; Arbisopsis thaliana; thale kress
Rank
species
Lineage
Show more ... ; Embryophyta; Tracheophyta; Euphyllophyta; Spermatophyta; Magnoliophyta; Mesangiospermae; eudicotyledons; Gunneridae; Pentapetalae; rosids; malvids; Brassicales; Brassicaceae; Camelineae; Arabidopsis
NCBI Taxonomy ID
is Taxon B an Infraspecies?
Yes
Taxon B Description
Arabidopsis thaliana- Dja-1
GENOTYPIC CHANGE
Generic Gene Name
AXX17_At2g45450
Synonyms
AXX17_At2g45450
String
-
Sequence Similarities
-
GO - Biological Process
-
GO - Cellular Component
-
UniProtKB
Arabidopsis thaliana
GenebankID or UniProtKB
Presumptive Null
Yes
Molecular Type
Aberration Type
Insertion Size
1-9 bp
Molecular Details of the Mutation
frameshift mutation due to a 1-bp insertion 581 bp after the ATG codon that changed amino acids 194 to 205 followed by the introduction of a stop codon
Experimental Evidence
Authors
Saez-Aguayo S; Rondeau-Mouro C; Macquet A; Kronholm I; Ralet MC; Berger A; Sallé C; Poulain D; et al. ... show more
Abstract
Arabidopsis seeds rapidly release hydrophilic polysaccharides from the seed coat on imbibition. These form a heavy mucilage layer around the seed that makes it sink in water. Fourteen natural Arabidopsis variants from central Asia and Scandinavia were identified with seeds that have modified mucilage release and float. Four of these have a novel mucilage phenotype with almost none of the released mucilage adhering to the seed and the absence of cellulose microfibrils. Mucilage release was modified in the variants by ten independent causal mutations in four different loci. Seven distinct mutations affected one locus, coding the MUM2 β-D-galactosidase, and represent a striking example of allelic heterogeneity. The modification of mucilage release has thus evolved a number of times independently in two restricted geographical zones. All the natural mutants identified still accumulated mucilage polysaccharides in seed coat epidermal cells. Using nuclear magnetic resonance (NMR) relaxometry their production and retention was shown to reduce water mobility into internal seed tissues during imbibition, which would help to maintain seed buoyancy. Surprisingly, despite released mucilage being an excellent hydrogel it did not increase the rate of water uptake by internal seed tissues and is more likely to play a role in retaining water around the seed.
RELATED GEPHE
Related Haplotypes
No matches found.
COMMENTS
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