Abstract
Abstract— A number of plant phototoxins, when supplemented with UVA (320–400 nm) radiation, are capable of sensitizing the decomposition of indole‐3‐acetic acid (IAA), as measured by release of 14 CO 2 from carboxyl‐labeled IAA. Alpha‐terthienyl (αT) and harmine caused significant rates of IAA decarboxylation at concentrations as low as 1 n M and were approximately 80% as effective as riboflavin and flavin mononucleotide. Partial inhibition by sodium azide indicates that the aT‐induced decarboxylation of IAA is predominately, but not entirely, a type II reaction mediated by singlet oxygen. Based on changes in UV ab sorption spectra, it appears that the hormones gibberellic acid, abscisic acid and 6‐benzylaminopurine (a cytokinin) are less susceptible to photosensitized decomposition than is IAA. Alpha‐terthienyl plus UVA also inhibited elongation growth and reduced endogenous IAA levels in Avena sativa L. coleoptile sections and promoted senescence in intact Avena seedlings. These results confirm the allelopathic potential of plant photosensitizers such as αT and indicate that the phytohormone IAA may represent an additional target for the action of photosensitizers.
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Claims 8
Claim · model-written summary
Plant phototoxins with UVA sensitized IAA decomposition.
- Taxon
- Avena sativa
Avena sativat0 - Treatment
- plant phototoxins, when supplemented with UVA (320–400 nm) radiatione0
- Outcome
- decomposition of indole‐3‐acetic acid (IAA)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A number of plant phototoxins, when supplemented with UVA (320–400 nm) radiation, are capable of sensitizing the decomposition of indole‐3‐acetic acid (IAA), as measured by release of 14 CO 2 from carboxyl‐labeled IAA.”
t0“Avena sativa”
Claim · model-written summary
Alpha-terthienyl caused significant IAA decarboxylation at concentrations as low as 1 n M.
- Taxon
- Avena sativaAvena sativat0
- Treatment
- Alpha‐terthienyl (αT)e0
- Outcome
- IAA decarboxylatione0
- Value
- 1 n Me0
- Qualifier
- approximately 80%e0
- Comparator
- riboflavin and flavin mononucleotidee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alpha‐terthienyl (αT) and harmine caused significant rates of IAA decarboxylation at concentrations as low as 1 n M and were approximately 80% as effective as riboflavin and flavin mononucleotide.”
t0“Avena sativa”
Claim · model-written summary
Harmine caused significant IAA decarboxylation at concentrations as low as 1 n M.
- Taxon
- Avena sativaAvena sativat0
- Treatment
- harminee0
- Outcome
- IAA decarboxylatione0
- Value
- 1 n Me0
- Qualifier
- approximately 80%e0
- Comparator
- riboflavin and flavin mononucleotidee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alpha‐terthienyl (αT) and harmine caused significant rates of IAA decarboxylation at concentrations as low as 1 n M and were approximately 80% as effective as riboflavin and flavin mononucleotide.”
t0“Avena sativa”
Claim · model-written summary
Sodium azide partly inhibited alpha-terthienyl induced IAA decarboxylation, supporting a predominantly singlet oxygen reaction.
- Taxon
- Avena sativaAvena sativat0
- Treatment
- sodium azidee0
- Outcome
- aT‐induced decarboxylation of IAAe0
- Qualifier
- a type II reaction mediated by singlet oxygene0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Partial inhibition by sodium azide indicates that the aT‐induced decarboxylation of IAA is predominately, but not entirely, a type II reaction mediated by singlet oxygen.”
t0“Avena sativa”
Claim · model-written summary
Gibberellic acid, abscisic acid and 6-benzylaminopurine appeared less susceptible to photosensitized decomposition than IAA.
- Taxon
- Avena sativaAvena sativat0
- Outcome
- less susceptible to photosensitized decompositione0
- Direction
- lesse0
- Comparator
- IAAe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the hormones gibberellic acid, abscisic acid and 6‐benzylaminopurine (a cytokinin) are less susceptible to photosensitized decomposition than is IAA.”
t0“Avena sativa”
Claim · model-written summary
Alpha-terthienyl plus UVA inhibited coleoptile elongation growth.
- Taxon
- Avena sativa L.Avena sativae0
- Organ / stage
- coleoptile sectionse0
- Treatment
- Alpha‐terthienyl plus UVAe0
- Outcome
- elongation growthe0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alpha‐terthienyl plus UVA also inhibited elongation growth and reduced endogenous IAA levels in Avena sativa L. coleoptile sections and promoted senescence in intact Avena seedlings.”
Claim · model-written summary
Alpha-terthienyl plus UVA reduced endogenous IAA in coleoptiles.
- Taxon
- Avena sativa L.Avena sativae0
- Organ / stage
- coleoptile sectionse0
- Treatment
- Alpha‐terthienyl plus UVAe0
- Outcome
- endogenous IAA levelse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alpha‐terthienyl plus UVA also inhibited elongation growth and reduced endogenous IAA levels in Avena sativa L. coleoptile sections and promoted senescence in intact Avena seedlings.”
Claim · model-written summary
Alpha-terthienyl plus UVA promoted senescence in intact Avena seedlings.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alpha‐terthienyl plus UVA also inhibited elongation growth and reduced endogenous IAA levels in Avena sativa L. coleoptile sections and promoted senescence in intact Avena seedlings.”
The same questions in other papers
uv · growth · Avena sativa (oats)Results agree
4 papers in the same direction as this paper
- negative
- negative
- no effect
1 paper more in this group
See all 5 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.