Abstract
Broad‐band UV‐B radiation inhibited hypocotyl elongation in etiolated tomato ( Lycopersicon esculentum Mill. cv. Alisa Craig) seedlings. This inhibition could be elicited by < 3 μmol m −2 s −1 of UV‐B radiation provided against a background of white light (> 620 μmol m −2 s −1 between 320 and 800 nm), and was similar in wild‐type and phytochrome‐1‐deficient aurea mutant seedlings. These observations suggest that the effect of UV‐B radiation is not mediated by phytochrome. An activity spectrum obtained by delivering 1 μmol m −2 s −1 of monochromatic UV radiation against a while light background (63 μmol m −2 s −1 showed maximum effectiveness around 300 nm, which suggests that DNA or aromatic residues in proteins are not the chromophores mediating UV‐B induced inhibition of elongation. Chemicals that affect the normal (photo)chemistry of flavins and possibly pterins (KI, NaN, and phenylacetic acid) largely abolished the inhibitor) effect of broad‐hand UV‐B radiation when applied to the root zone before irradiation. KI was effective at concentrations < 10 −4 M , which have been shown in vitro to be effective in quenching the triplet excited stales of flavins but not fluorescence from pterine or singlet states of flavins. Elimination of blue light or reduction of UV‐A, two sources of flavin excitation, promoted hypocotyl elongation, but did not affect the inhibition of elongation evened by UV‐B. Kl applied after UV‐B irradiation had no effect on the inhibition response. Taken together these findings suggest that the chromophore of the photoreceptor system invoked in UV‐B perception by tomato seedlings during de‐etiolation may be a flavin.
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
Broad-band UV-B inhibited hypocotyl elongation in etiolated tomato seedlings.
- Taxon
- tomato
Solanum lycopersicume0 - Material
- Alisa Craige0
- Organ / stage
- hypocotyle0
- Treatment
- Broad‐band UV‐B radiatione0
- Outcome
- hypocotyl elongatione0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Broad‐band UV‐B radiation inhibited hypocotyl elongation in etiolated tomato ( Lycopersicon esculentum Mill. cv. Alisa Craig) seedlings”
Claim · model-written summary
Less than 3 μmol m −2 s −1 UV-B elicited inhibition against white light.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- < 3 μmol m −2 s −1 of UV‐B radiatione0
- Outcome
- inhibitione0
- Comparator
- white lighte0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This inhibition could be elicited by < 3 μmol m −2 s −1 of UV‐B radiation provided against a background of white light”
t0“tomato seedlings”
Claim · model-written summary
UV-B inhibition was similar in wild-type and aurea mutant seedlings.
- Taxon
- tomatoSolanum lycopersicumt0
- Material
- phytochrome‐1‐deficient aurea mutante0
- Treatment
- UV‐B radiatione1
- Outcome
- inhibitione1
- Direction
- similare0
- Comparator
- wild‐typee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“was similar in wild‐type and phytochrome‐1‐deficient aurea mutant seedlings”
e1“This inhibition could be elicited by < 3 μmol m −2 s −1 of UV‐B radiation”
t0“tomato seedlings”
Claim · model-written summary
The activity spectrum showed maximum effectiveness near 300 nm.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- effectivenesse0
- Direction
- maximume0
- Value
- 300 nme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“showed maximum effectiveness around 300 nm”
t0“tomato seedlings”
Claim · model-written summary
KI, NaN, and phenylacetic acid largely abolished UV-B inhibition when applied before irradiation.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- KI, NaN, and phenylacetic acide0
- Outcome
- inhibitor) effect of broad‐hand UV‐B radiatione0
- Direction
- abolishede0
- Qualifier
- when applied to the root zone before irradiatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chemicals that affect the normal (photo)chemistry of flavins and possibly pterins (KI, NaN, and phenylacetic acid) largely abolished the inhibitor) effect of broad‐hand UV‐B radiation when applied to the root zone before irradiation”
t0“tomato seedlings”
Claim · model-written summary
Eliminating blue light promoted hypocotyl elongation.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- Elimination of blue lighte0
- Outcome
- hypocotyl elongatione0
- Direction
- promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Elimination of blue light or reduction of UV‐A, two sources of flavin excitation, promoted hypocotyl elongation”
t0“tomato seedlings”
Claim · model-written summary
Reducing UV-A promoted hypocotyl elongation.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- reduction of UV‐Ae0
- Outcome
- hypocotyl elongatione0
- Direction
- promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Elimination of blue light or reduction of UV‐A, two sources of flavin excitation, promoted hypocotyl elongation”
t0“tomato seedlings”
Claim · model-written summary
Blue-light elimination and UV-A reduction did not alter UV-B inhibition.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- Elimination of blue light or reduction of UV‐Ae1
- Outcome
- inhibition of elongation evened by UV‐Be0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but did not affect the inhibition of elongation evened by UV‐B”
e1“Elimination of blue light or reduction of UV‐A”
t0“tomato seedlings”
Claim · model-written summary
KI applied after UV-B irradiation did not alter inhibition.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- Kl applied after UV‐B irradiatione0
- Outcome
- inhibition responsee0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Kl applied after UV‐B irradiation had no effect on the inhibition response”
t0“tomato seedlings”
Claim · model-written summary
Authors suggest a flavin chromophore for UV-B perception during tomato de-etiolation.
- Taxon
- tomatoSolanum lycopersicume0
- Compound
- flavine0
- Outcome
- UV‐B perceptione0
- Qualifier
- may bee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the chromophore of the photoreceptor system invoked in UV‐B perception by tomato seedlings during de‐etiolation may be a flavin”
The same questions in other papers
uv · growth · Solanum lycopersicum (tomato)Results differ
11 papers in the same direction as this paper · 15 in the opposite direction
- negative
- negative
- negative
23 papers more in this group
See all 27 papers →uv · disease · Solanum lycopersicum (tomato)Positive and negative results
18 in the opposite direction
- positive
- positive
- positive
15 papers more in this group
See all 19 papers →light · disease · Solanum lycopersicum (tomato)Positive and negative results
11 papers in the same direction as this paper · 24 in the opposite direction
- positive
- positive
- positive
32 papers more in this group
See all 36 papers →light · growth · Solanum lycopersicum (tomato)Positive and negative results
154 papers in the same direction as this paper · 66 in the opposite direction · 5 reporting no difference from an alternative
- negative
- positive
- negative
222 papers more in this group
See all 226 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.