Abstract
White light (WL) inhibited the stem elongation of etiolated pea ( Pisum sativum L.) seedlings and the inhibition was partially reversed by the application of gibberellin A 1 (GA 1 ), the active GA in shoot growth. The amount of GA 1 in the apical shoot was reduced to about 25% after 2 h of WL, and to a trace level after 4 h. The effect of light on GA 1 content was reversed when the plants were transferred again to the dark after 6 h of WL. The effect of light on the expression of GA 20‐oxidase and GA 3 β ‐hydroxylase genes, coding for the last steps of GA 1 biosynthesis, was also investigated. Contrary to expectations, the amounts of GA 20‐oxidase and GA 3 β ‐hydroxylase transcripts increased in the entire apical shoot of WL‐irradiated seedlings, and this increase was negated in seedlings treated with GA 1 before WL irradiation, probably as a result of negative feed‐back regulation. The effect of WL on GA 20‐oxidase transcripts was mainly localized in the apex (hook) whereas the effect on GA 3 β ‐hydroxylase transcripts was mainly localized in the subapical tissues. Red and far‐red light also enhanced the GA 20‐oxidase transcript level, but not that of GA 3 β ‐hydroxylase, suggesting that different photoreceptors are involved in the regulation of these genes by WL. The results presented indicate that the inhibition of stem elongation by light is due, at least partially, to a decrease of GA 1 content by a still unknown mechanism. The increase of GA 8 upon WL irradiation raises the possibility that an inactivation activity may be involved in the control of the content of GA 1 by light.
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 15
Claim · model-written summary
White light inhibited elongation of etiolated pea stems.
- Taxon
- pea
Lathyrus oleraceuse0 - Organ / stage
- steme0
- Treatment
- White lighte0
- Outcome
- stem elongatione0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“White light (WL) inhibited the stem elongation of etiolated pea ( Pisum sativum L.) seedlings”
Claim · model-written summary
Applied GA1 partially reversed the white-light inhibition of stem elongation.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- application of gibberellin A 1 (GA 1 )e0
- Outcome
- inhibitione0
- Direction
- partially reversede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the inhibition was partially reversed by the application of gibberellin A 1 (GA 1 )”
t0“pea”
Claim · model-written summary
GA1 in the apical shoot fell to about 25% after two hours of white light.
- Taxon
- peaLathyrus oleraceust0
- Organ / stage
- apical shoote0
- Treatment
- WLe0
- Outcome
- amount of GA 1e0
- Direction
- reducede0
- Value
- about 25%e0
- Qualifier
- after 2 he0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The amount of GA 1 in the apical shoot was reduced to about 25% after 2 h of WL”
t0“pea”
Claim · model-written summary
GA1 in the apical shoot fell to trace levels after four hours.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- WLe1
- Outcome
- GA 1e2
- Direction
- decreaseinferrede0
- Qualifier
- after 4 he0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“and to a trace level after 4 h”
t0“pea”
e1“White light (WL) inhibited the stem elongation of etiolated pea ( Pisum sativum L.) seedlings”
e2“The amount of GA 1 in the apical shoot was reduced to about 25% after 2 h of WL”
Claim · model-written summary
Transfer back to darkness reversed the light effect on GA1 content.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- transferred again to the darke0
- Outcome
- GA 1 contente0
- Direction
- reversede0
- Qualifier
- after 6 he0
- Comparator
- WLe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of light on GA 1 content was reversed when the plants were transferred again to the dark after 6 h of WL.”
t0“pea”
Claim · model-written summary
White light raised GA 20-oxidase transcripts in apical shoots.
- Taxon
- peaLathyrus oleraceust0
- Organ / stage
- apical shoote0
- Treatment
- WL‐irradiatede0
- Gene
- GA 20‐oxidasee0
- Outcome
- GA 20‐oxidasee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the amounts of GA 20‐oxidase and GA 3 β ‐hydroxylase transcripts increased in the entire apical shoot of WL‐irradiated seedlings”
t0“pea”
Claim · model-written summary
White light raised GA 3β-hydroxylase transcripts in apical shoots.
- Taxon
- peaLathyrus oleraceust0
- Organ / stage
- apical shoote0
- Treatment
- WL‐irradiatede0
- Gene
- GA 3 β ‐hydroxylasee0
- Outcome
- GA 3 β ‐hydroxylase transcriptse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GA 20‐oxidase and GA 3 β ‐hydroxylase transcripts increased in the entire apical shoot of WL‐irradiated seedlings”
t0“pea”
Claim · model-written summary
GA1 pretreatment negated the white-light transcript increases.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- GA 1 before WL irradiatione0
- Outcome
- this increasee0
- Direction
- negatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this increase was negated in seedlings treated with GA 1 before WL irradiation”
t0“pea”
Claim · model-written summary
The white-light effect on GA 20-oxidase transcripts was localized mainly in the hook.
- Taxon
- peaLathyrus oleraceust0
- Organ / stage
- apex (hook)e0
- Gene
- GA 20‐oxidasee0
- Outcome
- effect of WLe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of WL on GA 20‐oxidase transcripts was mainly localized in the apex (hook)”
t0“pea”
Claim · model-written summary
The white-light effect on GA 3β-hydroxylase transcripts was localized mainly in subapical tissues.
- Taxon
- peaLathyrus oleraceust0
- Organ / stage
- subapical tissuese0
- Gene
- GA 3 β ‐hydroxylasee0
- Outcome
- effecte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effect on GA 3 β ‐hydroxylase transcripts was mainly localized in the subapical tissues”
t0“pea”
Claim · model-written summary
Red light enhanced GA 20-oxidase transcripts.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- Rede0
- Gene
- GA 20‐oxidasee0
- Outcome
- GA 20‐oxidase transcript levele0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Red and far‐red light also enhanced the GA 20‐oxidase transcript level”
t0“pea”
Claim · model-written summary
Far-red light enhanced GA 20-oxidase transcripts.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- far‐red lighte0
- Gene
- GA 20‐oxidasee0
- Outcome
- GA 20‐oxidase transcript levele0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Red and far‐red light also enhanced the GA 20‐oxidase transcript level”
t0“pea”
Claim · model-written summary
Red and far-red light did not enhance GA 3β-hydroxylase transcripts.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- Red and far‐red lighte1
- Gene
- GA 3 β ‐hydroxylasee0
- Outcome
- GA 3 β ‐hydroxylasee0
- Direction
- no_changeinferrede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but not that of GA 3 β ‐hydroxylase”
t0“pea”
e1“Red and far‐red light also enhanced the GA 20‐oxidase transcript level”
Claim · model-written summary
Authors attribute light-inhibited stem elongation partly to lower GA1 content.
- Taxon
- peaLathyrus oleraceust0
- Compound
- GA 1e0
- Outcome
- inhibition of stem elongatione0
- Qualifier
- by a still unknown mechanisme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the inhibition of stem elongation by light is due, at least partially, to a decrease of GA 1 content by a still unknown mechanism”
t0“pea”
Claim · model-written summary
White light increased GA8.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- WL irradiatione0
- Outcome
- GA 8e0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The increase of GA 8 upon WL irradiation”
t0“pea”
The same questions in other papers
Gibberellic acid · disease · Lathyrus oleraceus (pea)Positive and negative results
3 papers in the same direction as this paper · 1 reporting no difference from an alternative
- no effect
- positive
- positive
1 paper more in this group
See all 5 papers →light · molecular: metabolites · Lathyrus oleraceus (pea)Positive and negative results
25 papers in the same direction as this paper · 20 in the opposite direction · 3 reporting no difference from an alternative
- negative
- no effect
- negative
45 papers more in this group
See all 49 papers →light · growth · Lathyrus oleraceus (pea)Positive and negative results
25 papers in the same direction as this paper · 33 in the opposite direction
- positive
- positive
- positive
55 papers more in this group
See all 59 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.