Abstract
About 4 hours after they are cut from the seedling, corn (Zea mays L.) coleoptile segments mounted vertically show a strong increase in growth rate. This increase occurs in water or various buffers near pH 7 and is not accompanied by the accumulation of a growth promoter in the medium. The increase in growth rate is prevented by 1 mmp-fluorophenylalanine and is strongly inhibited by 0.1 mmp-chlorophenoxyisobutyric acid.The increased growth rate is accompanied by a 95% increase in the ability of tissue extracts to catalyze the conversion of (14)C-tryptophan to (14)C-indole-3-acetic acid and by a nearly 3-fold increase in indole-3-acetic acid oxidase activity. The increase in growth rate is also observed in segments from coleoptiles grown aseptically.The spontaneous increase in growth rate is completely but reversibly inhibited by 1 mum indole-3-acetic acid. Cytokinins have little effect on the spontaneous growth response, whereas gibberellic acid is observed to extend the latent period and reduce the magnitude of the response. It is tentatively concluded that the increase in endogenous growth rate may result from increased auxin production upon derepression of the auxin biosynthesis pathway after isolating the tissue from the normal supply of auxin from the tip.
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 11
Claim · model-written summary
Excised corn coleoptile segments show a strong increase in growth rate about 4 hours after cutting.
- Organ / stage
- coleoptile segmentse0
- Outcome
- growth ratee0
- Direction
- strong increasee0
- Qualifier
- About 4 hours after they are cut from the seedlinge1
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn (Zea mays L.) coleoptile segments mounted vertically show a strong increase in growth rate”
e1“About 4 hours after they are cut from the seedling”
Claim · model-written summary
The spontaneous increase in growth rate of coleoptile segments is prevented by 1 mmp-fluorophenylalanine.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn (Zea mays L.) coleoptile segments mounted vertically show a strong increase in growth rate”
e2“The increase in growth rate is prevented by 1 mmp-fluorophenylalanine and is strongly inhibited by 0.1 mmp-chlorophenoxyisobutyric acid”
Claim · model-written summary
The spontaneous increase in growth rate of coleoptile segments is strongly inhibited by 0.1 mmp-chlorophenoxyisobutyric acid.
- Treatment
- 0.1 mmp-chlorophenoxyisobutyric acide2
- Outcome
- increase in growth ratee2
- Direction
- strongly inhibitede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn (Zea mays L.) coleoptile segments mounted vertically show a strong increase in growth rate”
e2“The increase in growth rate is prevented by 1 mmp-fluorophenylalanine and is strongly inhibited by 0.1 mmp-chlorophenoxyisobutyric acid”
Claim · model-written summary
The increased growth rate is accompanied by a 95% increase in the ability of tissue extracts to convert (14)C-tryptophan to (14)C-indole-3-acetic acid.
- Outcome
- ability of tissue extracts to catalyze the conversion of (14)C-tryptophan to (14)C-indole-3-acetic acide3
- Direction
- increasee3
- Value
- 95%e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn (Zea mays L.) coleoptile segments mounted vertically show a strong increase in growth rate”
e3“The increased growth rate is accompanied by a 95% increase in the ability of tissue extracts to catalyze the conversion of (14)C-tryptophan to (14)C-indole-3-acetic acid and by a nearly 3-fold increase in indole-3-acetic acid oxidase activity”
Claim · model-written summary
Indole-3-acetic acid oxidase activity is nearly 3-fold higher in the growing segments.
- Gene
- indole-3-acetic acid oxidasee3
- Outcome
- indole-3-acetic acid oxidase activitye3
- Direction
- increasee3
- Value
- nearly 3-folde3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn (Zea mays L.) coleoptile segments mounted vertically show a strong increase in growth rate”
e3“The increased growth rate is accompanied by a 95% increase in the ability of tissue extracts to catalyze the conversion of (14)C-tryptophan to (14)C-indole-3-acetic acid and by a nearly 3-fold increase in indole-3-acetic acid oxidase activity”
Claim · model-written summary
The increase in growth rate is also observed in segments from coleoptiles grown aseptically.
- Outcome
- increase in growth ratee4
- Direction
- increasee4
- Qualifier
- segments from coleoptiles grown asepticallye4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn (Zea mays L.) coleoptile segments mounted vertically show a strong increase in growth rate”
e4“The increase in growth rate is also observed in segments from coleoptiles grown aseptically”
Claim · model-written summary
The spontaneous increase in growth rate is completely but reversibly inhibited by 1 mum indole-3-acetic acid.
- Treatment
- 1 mum indole-3-acetic acide5
- Outcome
- spontaneous increase in growth ratee5
- Direction
- completely but reversibly inhibitede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn (Zea mays L.) coleoptile segments mounted vertically show a strong increase in growth rate”
e5“The spontaneous increase in growth rate is completely but reversibly inhibited by 1 mum indole-3-acetic acid”
Claim · model-written summary
Cytokinins have little effect on the spontaneous growth response.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn (Zea mays L.) coleoptile segments mounted vertically show a strong increase in growth rate”
e6“Cytokinins have little effect on the spontaneous growth response, whereas gibberellic acid is observed to extend the latent period and reduce the magnitude of the response”
Claim · model-written summary
Gibberellic acid extends the latent period of the spontaneous growth response.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn (Zea mays L.) coleoptile segments mounted vertically show a strong increase in growth rate”
e6“Cytokinins have little effect on the spontaneous growth response, whereas gibberellic acid is observed to extend the latent period and reduce the magnitude of the response”
Claim · model-written summary
Gibberellic acid reduces the magnitude of the spontaneous growth response.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn (Zea mays L.) coleoptile segments mounted vertically show a strong increase in growth rate”
e6“Cytokinins have little effect on the spontaneous growth response, whereas gibberellic acid is observed to extend the latent period and reduce the magnitude of the response”
Claim · model-written summary
The increase in endogenous growth rate may result from increased auxin production after derepression of the auxin biosynthesis pathway when the tissue is isolated from the auxin supply of the tip.
- Compound
- auxine7
- Outcome
- increase in endogenous growth ratee7
- Qualifier
- increased auxin production upon derepression of the auxin biosynthesis pathwaye7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn (Zea mays L.) coleoptile segments mounted vertically show a strong increase in growth rate”
e7“the increase in endogenous growth rate may result from increased auxin production upon derepression of the auxin biosynthesis pathway after isolating the tissue from the normal supply of auxin from the tip”
The same questions in other papers
class · growth · Zea mays (maize)Positive and negative results
14 papers in the same direction as this paper · 53 in the opposite direction
- positive
- positive
- positive
64 papers more in this group
See all 68 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.