Abstract
The gibberellins (GAs) are endogenous regulators of plant growth. Experiments are described here that test the hypothesis that GA regulates hypocotyl growth by altering the extent of hypocotyl cell elongation. These experiments use GA-deficient and altered GA-response mutants of Arabidopsis thaliana (L.) Heyhn. It is shown that GA regulates elongation, in both light- and dark-grown hypocotyls, by influencing the rate and final extent of cellular elongation. However, light- and dark-grown hypocotyls exhibit markedly different GA dose-response relationships. The length of dark-grown hypocotyls is relatively unaffected by exogenous GA, whilst light-grown hypocotyl length is significantly increased by exogenous GA. Further analysis suggests that GA control of hypocotyl length is close to saturation in dark-grown hypocotyls, but not in light-grown hypocotyls. The results show that a large range of possible hypocotyl lengths is achieved via dose-dependent GA-regulated alterations in the degree of elongation of individual hypocotyl cells.
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Claims 5
Claim · model-written summary
Gibberellin regulated cell elongation rate and final extent in light- and dark-grown hypocotyls.
- Taxon
- Arabidopsis
Arabidopsist0 - Organ / stage
- hypocotylse0
- Treatment
- GAe0
- Outcome
- rate and final extent of cellular elongatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GA regulates elongation, in both light- and dark-grown hypocotyls, by influencing the rate and final extent of cellular elongation”
t0“Arabidopsis”
Claim · model-written summary
Light and dark grown hypocotyls had markedly different GA dose responses.
- Taxon
- ArabidopsisArabidopsist0
- Organ / stage
- hypocotylse0
- Outcome
- GA dose-response relationshipse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“light- and dark-grown hypocotyls exhibit markedly different GA dose-response relationships”
t0“Arabidopsis”
Claim · model-written summary
Exogenous GA left dark-grown hypocotyl length relatively unaffected.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- exogenous GAe0
- Outcome
- length of dark-grown hypocotylse0
- Direction
- relatively unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The length of dark-grown hypocotyls is relatively unaffected by exogenous GA”
t0“Arabidopsis”
Claim · model-written summary
Exogenous GA significantly increased light-grown hypocotyl length.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- exogenous GAe0
- Outcome
- light-grown hypocotyl lengthe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“light-grown hypocotyl length is significantly increased by exogenous GA”
t0“Arabidopsis”
Claim · model-written summary
GA control of dark-grown hypocotyl length was inferred near saturation.
- Taxon
- ArabidopsisArabidopsist0
- Outcome
- hypocotyl lengthe0
- Qualifier
- close to saturation in dark-grown hypocotylse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GA control of hypocotyl length is close to saturation in dark-grown hypocotyls, but not in light-grown hypocotyls”
t0“Arabidopsis”
The same questions in other papers
Gibberellic acid · growth · ArabidopsisResults differ
16 papers in the same direction as this paper · 5 in the opposite direction
- negative
- positive
- negative
18 papers more in this group
See all 22 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.