Abstract
In barley seedlings grown in the dark large amounts of thionin-specific mRNAs are present, the concentration of which rapidly declines once the seedling is exposed to light. This rapid light effect is mediated by a complex interaction of possibly two photoreceptors, phytochrome and a blue-light-absorbing photoreceptor. Parallel to the decline in mRNA content, the de novo synthesis of leaf-specific thionins ceases rapidly upon illumination of etiolated seedlings. However, thionins which have accumulated before the onset of illumination remain stable within the seedling at high concentrations. In younger leaves of mature, nonstressed barley plants grown under a 16-h-light/8-h-dark cycle thionins are still present, although at much lower concentrations. In these plants, synthesis and accumulation of thionins occur predominantly in the meristematic zone at the leaf basis, which is shielded from light through the sheath of the preceding leaf. In mature light-adapted barley plants, mRNA encoding leaf-specific thionins may reaccumulate if these plants are exposed to pathogens or other stresses. Thus, the inhibitory effect of light on the biosynthesis of thionins may be overruled by stress- and pathogen-induced signals.
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Claims 7
Claim · model-written summary
Light exposure rapidly decreases thionin-specific mRNA in dark-grown barley seedlings.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaret0 - Organ / stage
- seedlingse0
- Treatment
- exposed to lighte0
- Outcome
- thionin-specific mRNAse0
- Direction
- declinese0
- Comparator
- grown in the darke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“barley”
e0“In barley seedlings grown in the dark large amounts of thionin-specific mRNAs are present, the concentration of which rapidly declines once the seedling is exposed to light.”
Claim · model-written summary
The rapid light effect involves possibly two photoreceptors.
- Taxon
- barleyHordeum vulgaret0
- Gene
- phytochrome and a blue-light-absorbing photoreceptore0
- Outcome
- rapid light effecte0
- Qualifier
- possibly two photoreceptorse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley”
e0“This rapid light effect is mediated by a complex interaction of possibly two photoreceptors, phytochrome and a blue-light-absorbing photoreceptor.”
Claim · model-written summary
Illumination rapidly stops de novo leaf-specific thionin synthesis in etiolated barley seedlings.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- etiolated seedlingse0
- Treatment
- illuminatione0
- Outcome
- de novo synthesis of leaf-specific thioninse0
- Direction
- ceasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley”
e0“the de novo synthesis of leaf-specific thionins ceases rapidly upon illumination of etiolated seedlings.”
Claim · model-written summary
Thionins accumulated before illumination remain stable at high concentrations in barley seedlings.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- seedlinge0
- Outcome
- thionins which have accumulated before the onset of illumination remain stablee0
- Qualifier
- at high concentrationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley”
e0“thionins which have accumulated before the onset of illumination remain stable within the seedling at high concentrations.”
Claim · model-written summary
Younger leaves of mature barley grown under a 16-h-light/8-h-dark cycle retain thionins at much lower concentrations.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- younger leavese0
- Outcome
- thionins are still presente0
- Qualifier
- at much lower concentrationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley”
e0“In younger leaves of mature, nonstressed barley plants grown under a 16-h-light/8-h-dark cycle thionins are still present, although at much lower concentrations.”
Claim · model-written summary
Thionin synthesis and accumulation in mature barley occur predominantly in the shaded meristematic zone at the leaf basis.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- meristematic zone at the leaf basise0
- Outcome
- synthesis and accumulation of thioninse0
- Qualifier
- shielded from light through the sheath of the preceding leafe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley”
e0“synthesis and accumulation of thionins occur predominantly in the meristematic zone at the leaf basis, which is shielded from light through the sheath of the preceding leaf.”
Claim · model-written summary
Pathogens or other stress may restore leaf-specific thionin mRNA accumulation in mature light-adapted barley.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- mature light-adapted barley plantse0
- Treatment
- exposed to pathogens or other stressese0
- Outcome
- mRNA encoding leaf-specific thioninse0
- Direction
- reaccumulatee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley”
e0“In mature light-adapted barley plants, mRNA encoding leaf-specific thionins may reaccumulate if these plants are exposed to pathogens or other stresses.”
The same questions in other papers
light · molecular: metabolites · Hordeum vulgare (barley)Positive and negative results
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See all 30 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.