Abstract
Mutation of the COMATOSE locus in Arabidopsis results in a marked reduction in germination potential. Whilst the morphology of comatose (cts) embryos is not altered, physiological analysis reveals that mature cts seeds do not respond to gibberellin. Prolonged chilling of imbibed seeds only partially restores germination potential, and seeds do not after ripen. Genetic analysis shows that the cts phenotype is expressed in the embryo and phenotypic differences between wild-type and mutant plants were not observed during other stages of plant growth and development. Therefore cts represents a new class of mutant, with a specific lesion that results in severely impaired germination potential. Genetic interactions were analysed between cts and loci that regulate embryo maturation, and abscisic acid biosynthesis and perception. Results from these studies showed that the cts mutant phenotype required the wild-type action of these loci, and suggested that CTS exerts a repressive function on these loci. A model is presented postulating that CTS promotes increased germination potential, and represses embryo dormancy. These functions of CTS may result in the removal of embryo dormancy as a prerequisite to germination.
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Claims 8
Claim · model-written summary
Mutation of the COMATOSE locus in Arabidopsis reduces germination potential.
- Taxon
- Arabidopsis
Arabidopsise1 - Gene
- COMATOSE locuse1
- Outcome
- germination potentiale1
- Direction
- reductione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Mutation of the COMATOSE locus in Arabidopsis results in a marked reduction in germination potential”
Claim · model-written summary
Mature cts seeds do not respond to gibberellin.
- Taxon
- ArabidopsisArabidopsise1
- Material
- mature cts seedse2
- Compound
- gibberelline2
- Outcome
- respond to gibberelline2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Mutation of the COMATOSE locus in Arabidopsis results in a marked reduction in germination potential”
e2“mature cts seeds do not respond to gibberellin”
Claim · model-written summary
Prolonged chilling of imbibed seeds only partially restores germination potential.
- Taxon
- ArabidopsisArabidopsise1
- Treatment
- Prolonged chilling of imbibed seedse3
- Outcome
- germination potentiale3
- Direction
- partially restorese3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Mutation of the COMATOSE locus in Arabidopsis results in a marked reduction in germination potential”
e3“Prolonged chilling of imbibed seeds only partially restores germination potential”
Claim · model-written summary
Mature cts seeds do not after-ripen.
- Taxon
- ArabidopsisArabidopsise1
- Outcome
- after ripene4
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Mutation of the COMATOSE locus in Arabidopsis results in a marked reduction in germination potential”
e4“seeds do not after ripen”
Claim · model-written summary
The cts phenotype is expressed in the embryo.
- Taxon
- ArabidopsisArabidopsise1
- Material
- ctse5
- Organ / stage
- embryoe5
- Outcome
- cts phenotypee5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Mutation of the COMATOSE locus in Arabidopsis results in a marked reduction in germination potential”
e5“Genetic analysis shows that the cts phenotype is expressed in the embryo”
Claim · model-written summary
No phenotypic differences between wild-type and mutant plants were observed during other stages of growth and development.
- Taxon
- ArabidopsisArabidopsise1
- Organ / stage
- other stages of plant growth and developmente6
- Outcome
- phenotypic differencese6
- Comparator
- wild-typee6
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Mutation of the COMATOSE locus in Arabidopsis results in a marked reduction in germination potential”
e6“phenotypic differences between wild-type and mutant plants were not observed during other stages of plant growth and development”
Claim · model-written summary
The cts mutant phenotype requires the wild-type action of the loci regulating embryo maturation and abscisic acid, suggesting that CTS represses these loci.
- Taxon
- ArabidopsisArabidopsise1
- Gene
- CTSe7
- Outcome
- cts mutant phenotypee7
- Qualifier
- required the wild-type action of these locie7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Mutation of the COMATOSE locus in Arabidopsis results in a marked reduction in germination potential”
e7“Results from these studies showed that the cts mutant phenotype required the wild-type action of these loci, and suggested that CTS exerts a repressive function on these loci”
Claim · model-written summary
A model postulates that CTS promotes germination potential and represses embryo dormancy.
- Taxon
- ArabidopsisArabidopsise1
- Gene
- CTSe0
- Outcome
- germination potentiale0
- Qualifier
- represses embryo dormancye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Mutation of the COMATOSE locus in Arabidopsis results in a marked reduction in germination potential”
e0“A model is presented postulating that CTS promotes increased germination potential, and represses embryo dormancy”
The same questions in other papers
cold · growth · ArabidopsisPositive and negative results
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- negative
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See all 12 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.