Claim · model-written summary
The last-expressed ASC peroxidase isoenzyme has the lowest affinity for ASC when ASC content is 10–11 times higher in wheat embryos.
- Taxon
- wheat
Triticum aestivumt0 - Gene
- ASC peroxidase isoenzymese0
- Compound
- ASCe0
- Outcome
- affinities for ASCe0
- Direction
- loweste1
- Qualifier
- 10–11 times highere1
Not reportedMaterialOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“during the early stage of wheat germination”
e0“the affinities for ASC of the three ASC peroxidase isoenzymes that progressively appear during germination depend on the ASC available in the embryos: highest in the first isoenzyme, that appears when the ASC content is very low”
e1“lowest in the isoenzyme that is expressed last, when the ASC content is 10–11 times higher”
Title
Ascorbate synthesis and ascorbate peroxidase activity during the early stage of wheat germination
L. De Gara; M. C. de Pinto; O. Arrigoni Physiologia Plantarum 1997. doi:10.1111/j.1399-3054.1997.tb00015.x
Other claims from this paper (11)
- Observation Dry wheat embryos are devoid of ascorbate (ASC) but contain a low amount of dehydroascorbate (DHA).
- Observation Dry wheat embryos contain a low amount of dehydroascorbate (DHA).
- Observation De novo ASC biosynthesis starts in wheat embryos after 8–10 h of germination.
- Mechanism Before ASC biosynthesis is restored, wheat embryos can provide themselves with ASC by reducing stored DHA.
- Observation Three different proteins with DHA-reducing capability are present in wheat embryos during early germination.
- Association When ASC biosynthesis from sugar is completely restored, the DHA reduction capability of wheat embryos largely drops.
- Observation When ASC biosynthesis is restored, only one DHA-reducing protein remains active in wheat embryos.
- Observation Dry wheat embryos are devoid of ASC peroxidase, which appears after the same lag as ASC during germination.
- Association ASC peroxidase increases during germination in parallel with the rise in ASC in wheat.
- Intervention effect Experimentally induced ASC biosynthesis makes ASC peroxidase appear earlier in wheat embryos.
- Association The first ASC peroxidase isoenzyme, which appears when ASC is very low, has the highest affinity for ASC in wheat embryos.