GEPHE SUMMARY
Entry Status
Published
GepheID
GP00000246
Main curator
Martin
PHENOTYPIC CHANGE
Trait Category
Trait State in Taxon A
Hordeum vulgare
Trait State in Taxon B
Hordeum vulgare - var. Mona
Ancestral State
Taxon A
Taxonomic Status
Taxon A
Common Name
-
Synonyms
barley; Hordeum vulgare L.; Horedum vulgare
Rank
species
Lineage
Show more ... yta; Tracheophyta; Euphyllophyta; Spermatophyta; Magnoliophyta; Mesangiospermae; Liliopsida; Petrosaviidae; commelinids; Poales; Poaceae; BOP clade; Pooideae; Triticodae; Triticeae; Hordeinae; Hordeum
NCBI Taxonomy ID
is Taxon A an Infraspecies?
No
Taxon B
Common Name
-
Synonyms
barley; Hordeum vulgare L.; Horedum vulgare
Rank
species
Lineage
Show more ... yta; Tracheophyta; Euphyllophyta; Spermatophyta; Magnoliophyta; Mesangiospermae; Liliopsida; Petrosaviidae; commelinids; Poales; Poaceae; BOP clade; Pooideae; Triticodae; Triticeae; Hordeinae; Hordeum
NCBI Taxonomy ID
is Taxon B an Infraspecies?
Yes
Taxon B Description
Hordeum vulgare - var. Mona
GENOTYPIC CHANGE
Presumptive Null
Yes
Molecular Type
Aberration Type
Deletion Size
1-9 bp
Molecular Details of the Mutation
4bp deletion resulting in truncated protein ; this deletion seem to have evolved multiple times (fragile site?)
Experimental Evidence
Authors
Faure S; Turner AS; Gruszka D; Christodoulou V; Davis SJ; von Korff M; Laurie DA
Abstract
The circadian clock is an autonomous oscillator that produces endogenous biological rhythms with a period of about 24 h. This clock allows organisms to coordinate their metabolism and development with predicted daily and seasonal changes of the environment. In plants, circadian rhythms contribute to both evolutionary fitness and agricultural productivity. Nevertheless, we show that commercial barley varieties bred for short growing seasons by use of early maturity 8 (eam8) mutations, also termed mat-a, are severely compromised in clock gene expression and clock outputs. We identified EAM8 as a barley ortholog of the Arabidopsis thaliana circadian clock regulator EARLY FLOWERING3 (ELF3) and demonstrate that eam8 accelerates the transition from vegetative to reproductive growth and inflorescence development. We propose that eam8 was selected as barley cultivation moved to high-latitude short-season environments in Europe because it allowed rapid flowering in genetic backgrounds that contained a previously selected late-flowering mutation of the photoperiod response gene Ppd-H1. We show that eam8 mutants have increased expression of the floral activator HvFT1, which is independent of allelic variation at Ppd-H1. The selection of independent eam8 mutations shows that this strategy facilitates short growth-season adaptation and expansion of the geographic range of barley, despite the pronounced clock defect.
Additional References
COMMENTS
@Parallelism independent evoution of the same mutation (or alternatively: pseudo-replicate?)
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