Abstract
To test whether tocopherols (vitamin E) are essential in the protection against oxidative stress in plants, a series of Arabidopsis thaliana vitamin E (vte) biosynthetic mutants that accumulate different types and levels of tocopherols and pathway intermediates were analyzed under abiotic stress. Surprisingly subtle differences were observed between the tocopherol-deficient vte2 mutant and the wild type during high-light, salinity, and drought stresses. However, vte2, and to a lesser extent vte1, exhibited dramatic phenotypes under low temperature (i.e., increased anthocyanin levels and reduced growth and seed production). That these changes were independent of light level and occurred in the absence of photoinhibition or lipid peroxidation suggests that the mechanisms involved are independent of tocopherol functions in photoprotection. Compared with the wild type, vte1 and vte2 had reduced rates of photoassimilate export as early as 6 h into low-temperature treatment, increased soluble sugar levels by 60 h, and increased starch and reduced photosynthetic electron transport rate by 14 d. The rapid reduction in photoassimilate export in vte2 coincides with callose deposition exclusively in phloem parenchyma transfer cell walls adjacent to the companion cell/sieve element complex. Together, these results indicate that tocopherols have a more limited role in photoprotection than previously assumed but play crucial roles in low-temperature adaptation and phloem loading.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 10
Claim · model-written summary
The vte2 mutant differed only subtly from wild type under high light, salinity and drought.
- Taxon
- Arabidopsis
Arabidopsist0 - Material
- vte2 mutante0
- Treatment
- high-light, salinity, and drought stressese0
- Outcome
- subtle differencese0
- Comparator
- wild typee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Surprisingly subtle differences were observed between the tocopherol-deficient vte2 mutant and the wild type during high-light, salinity, and drought stresses”
t0“Arabidopsis”
Claim · model-written summary
At low temperature, vte2 and to a lesser extent vte1 accumulated more anthocyanin.
- Taxon
- ArabidopsisArabidopsist0
- Material
- vte2e0
- Treatment
- low temperaturee0
- Outcome
- anthocyanin levelse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“vte2, and to a lesser extent vte1, exhibited dramatic phenotypes under low temperature (i.e., increased anthocyanin levels and reduced growth and seed production)”
t0“Arabidopsis”
Claim · model-written summary
At low temperature, vte2 and to a lesser extent vte1 had reduced growth and seed production.
- Taxon
- ArabidopsisArabidopsist0
- Material
- vte2e0
- Treatment
- low temperaturee0
- Outcome
- growth and seed productione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“vte2, and to a lesser extent vte1, exhibited dramatic phenotypes under low temperature (i.e., increased anthocyanin levels and reduced growth and seed production)”
t0“Arabidopsis”
Claim · model-written summary
Low-temperature changes were independent of light level and occurred without photoinhibition or lipid peroxidation.
- Taxon
- ArabidopsisArabidopsist0
- Outcome
- absence of photoinhibition or lipid peroxidatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“these changes were independent of light level and occurred in the absence of photoinhibition or lipid peroxidation”
t0“Arabidopsis”
Claim · model-written summary
vte1 and vte2 had reduced photoassimilate export by 6 h of low temperature versus wild type.
- Taxon
- ArabidopsisArabidopsist0
- Material
- vte1 and vte2e0
- Treatment
- low-temperature treatmente0
- Outcome
- rates of photoassimilate exporte0
- Direction
- reducede0
- Qualifier
- as early as 6 he0
- Comparator
- wild typee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with the wild type, vte1 and vte2 had reduced rates of photoassimilate export as early as 6 h into low-temperature treatment”
t0“Arabidopsis”
Claim · model-written summary
vte1 and vte2 had increased soluble sugar by 60 h.
- Taxon
- ArabidopsisArabidopsist0
- Material
- vte1 and vte2e0
- Treatment
- low-temperature treatmente0
- Outcome
- soluble sugar levelse0
- Direction
- increasede0
- Qualifier
- by 60 he0
- Comparator
- wild typee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with the wild type, vte1 and vte2 had reduced rates of photoassimilate export as early as 6 h into low-temperature treatment, increased soluble sugar levels by 60 h”
t0“Arabidopsis”
Claim · model-written summary
vte1 and vte2 had increased starch by 14 d.
- Taxon
- ArabidopsisArabidopsist0
- Material
- Arabidopsist0
- Outcome
- starche0
- Direction
- increasede0
- Qualifier
- by 14 de0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased starch and reduced photosynthetic electron transport rate by 14 d”
t0“Arabidopsis”
Claim · model-written summary
vte1 and vte2 had reduced photosynthetic electron transport rate by 14 d.
- Taxon
- ArabidopsisArabidopsist0
- Outcome
- photosynthetic electron transport ratee0
- Direction
- reducede0
- Qualifier
- by 14 de0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased starch and reduced photosynthetic electron transport rate by 14 d”
t0“Arabidopsis”
Claim · model-written summary
The rapid fall in vte2 photoassimilate export coincided with callose deposition in phloem parenchyma transfer cell walls.
- Taxon
- ArabidopsisArabidopsist0
- Material
- vte2e0
- Organ / stage
- phloem parenchyma transfer cell wallse0
- Outcome
- photoassimilate exporte0
- Direction
- reductione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rapid reduction in photoassimilate export in vte2 coincides with callose deposition exclusively in phloem parenchyma transfer cell walls adjacent to the companion cell/sieve element complex”
t0“Arabidopsis”
Claim · model-written summary
The authors conclude tocopherols have limited photoprotective role but crucial roles in low-temperature adaptation and phloem loading.
- Taxon
- ArabidopsisArabidopsist0
- Outcome
- low-temperature adaptation and phloem loadinge0
- Qualifier
- tocopherolse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tocopherols have a more limited role in photoprotection than previously assumed but play crucial roles in low-temperature adaptation and phloem loading”
t0“Arabidopsis”
The same questions in other papers
cold · yield · ArabidopsisResults agree
1 paper in the same direction as this paper
- negative
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.