GEPHE SUMMARY
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Gephebase Gene
Entry Status
Published
GepheID
GP00001276
Main curator
Arnoult
PHENOTYPIC CHANGE
Trait Category
Trait
Trait State in Taxon A
Arabidopsis thaliana- Col-0 and other lines
Trait State in Taxon B
Arabidopsis thaliana- Ale-8 & Sku-20
Ancestral State
Data not curated
Taxonomic Status
Taxon A
Latin Name
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
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; 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
Latin Name
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
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; 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- Ale-8 & Sku-20
GENOTYPIC CHANGE
Generic Gene Name
BGAL6
Synonyms
beta-galactosidase 6; BGAL6; MBK5.28; MBK5_28; MUCILAGE-MODIFIED 2; At5g63800
String
Sequence Similarities
Belongs to the glycosyl hydrolase 35 family.
GO - Molecular Function
GO - Biological Process
GO:0005975 : carbohydrate metabolic process
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GO - Cellular Component
GO:0005773 : vacuole
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Presumptive Null
Molecular Type
Aberration Type
SNP Coding Change
Nonsense
Molecular Details of the Mutation
G->T @position 3425 causing premature stop
Experimental Evidence
Taxon A | Taxon B | Position | |
---|---|---|---|
Codon | - | - | - |
Amino-acid | - | - | - |
Main Reference
Authors
Saez-Aguayo S; Rondeau-Mouro C; Macquet A; Kronholm I; Ralet MC; Berger A; Sallé C; Poulain D; et al.
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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.
Additional References
RELATED GEPHE
Related Genes
Related Haplotypes
EXTERNAL LINKS
COMMENTS
Another null allele of MUM2 already found in 18165330
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