Abstract
Pulvini of excised segments from oats (Avena sativa L. cv Victory) were treated unilaterally with indoleacetic acid (IAA) or gibberellic acid (GA3) with or without gravistimulation to assess the effect of gravistimulation on hormone action. Optimum pulvinus elongation growth (millimeters) and segment curvature (degrees) over 24 hours were produced by 100 micromolar IAA in vertical segments. The curvature response to IAA at levels greater than 100 micromolar, applied to the lower sides of gravistimulated (90 degrees) pulvini, was significantly less than the response to identical levels in vertical segments. Furthermore, the bending response of pulvini to 100 micromolar IAA did not vary significantly over a range of presentation angles between 0 and 90 degrees. In contrast, the response to IAA at levels less than 10 micromolar, with gravistimulation, was approximately the sum of the responses to gravistimulation alone and to IAA without gravistimulation. This was observed over a range of presentation angles. Also, GA3 (0.3-30 micromolar) applied to the lower sides of horizontal segments significantly enhanced pulvinus growth and segment curvature, although exogenous GA3 over a range of concentrations had no effect on pulvinus elongation growth or segment curvature in vertical segments. The response to GA3 (10 micromolar) plus IAA (1.0 or 100 micromolar) was additive for either vertical or horizontal segments. These results indicate that gravistimulation produces changes in pulvinus responsiveness to both IAA and GA3 and that the changes are unique for each growth regulator. It is suggested that the changes in responsiveness may result from processes at the cellular level other than changes in hormonal sensitivity.
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Claims 9
Claim · model-written summary
Optimum pulvinus elongation and curvature over 24 hours were produced by 100 micromolar IAA in vertical segments.
- Taxon
- Avena sativa
Avena sativae0 - Material
- cv Victorye0
- Organ / stage
- Pulvinie0
- Treatment
- 100 micromolar IAAe1
- Outcome
- pulvinus elongation growthe1
- Direction
- increaseinferrede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pulvini of excised segments from oats (Avena sativa L. cv Victory)”
e1“Optimum pulvinus elongation growth (millimeters) and segment curvature (degrees) over 24 hours were produced by 100 micromolar IAA in vertical segments”
Claim · model-written summary
Curvature response to IAA above 100 micromolar on gravistimulated pulvini was significantly less than on vertical segments.
- Taxon
- Avena sativaAvena sativae0
- Organ / stage
- Pulvinie0
- Treatment
- gravistimulated (90 degrees) pulvinie2
- Outcome
- curvature response to IAAe2
- Direction
- significantly lesse2
- Comparator
- vertical segmentse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pulvini of excised segments from oats (Avena sativa L. cv Victory)”
e2“The curvature response to IAA at levels greater than 100 micromolar, applied to the lower sides of gravistimulated (90 degrees) pulvini, was significantly less than the response to identical levels in vertical segments”
Claim · model-written summary
The bending response to 100 micromolar IAA did not vary significantly across presentation angles from 0 to 90 degrees.
- Taxon
- Avena sativaAvena sativae0
- Organ / stage
- Pulvinie0
- Treatment
- presentation angles between 0 and 90 degreese3
- Outcome
- bending response of pulvini to 100 micromolar IAAe3
- Direction
- did not varye3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pulvini of excised segments from oats (Avena sativa L. cv Victory)”
e3“the bending response of pulvini to 100 micromolar IAA did not vary significantly over a range of presentation angles between 0 and 90 degrees”
Claim · model-written summary
The response to IAA below 10 micromolar with gravistimulation was approximately the sum of the responses to gravistimulation alone and to IAA alone.
- Taxon
- Avena sativaAvena sativae0
- Organ / stage
- Pulvinie0
- Treatment
- IAA at levels less than 10 micromolar, with gravistimulatione4
- Outcome
- responsee4
- Direction
- approximately the sume4
- Comparator
- gravistimulation alonee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pulvini of excised segments from oats (Avena sativa L. cv Victory)”
e4“the response to IAA at levels less than 10 micromolar, with gravistimulation, was approximately the sum of the responses to gravistimulation alone and to IAA without gravistimulation”
Claim · model-written summary
GA3 at 0.3-30 micromolar significantly enhanced pulvinus growth and segment curvature in horizontal segments.
- Taxon
- Avena sativaAvena sativae0
- Organ / stage
- Pulvinie0
- Treatment
- GA3 (0.3-30 micromolar)e5
- Outcome
- pulvinus growth and segment curvaturee5
- Direction
- significantly enhancede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pulvini of excised segments from oats (Avena sativa L. cv Victory)”
e5“GA3 (0.3-30 micromolar) applied to the lower sides of horizontal segments significantly enhanced pulvinus growth and segment curvature”
Claim · model-written summary
Exogenous GA3 over a range of concentrations had no effect on pulvinus elongation or curvature in vertical segments.
- Taxon
- Avena sativaAvena sativae0
- Organ / stage
- Pulvinie0
- Treatment
- exogenous GA3e6
- Outcome
- pulvinus elongation growth or segment curvature in vertical segmentse6
- Direction
- no effecte6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pulvini of excised segments from oats (Avena sativa L. cv Victory)”
e6“exogenous GA3 over a range of concentrations had no effect on pulvinus elongation growth or segment curvature in vertical segments”
Claim · model-written summary
GA3 at 10 micromolar plus IAA had an additive effect in both vertical and horizontal segments.
- Taxon
- Avena sativaAvena sativae0
- Organ / stage
- Pulvinie0
- Treatment
- GA3 (10 micromolar) plus IAAe7
- Outcome
- responsee7
- Direction
- additivee7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pulvini of excised segments from oats (Avena sativa L. cv Victory)”
e7“The response to GA3 (10 micromolar) plus IAA (1.0 or 100 micromolar) was additive for either vertical or horizontal segments”
Claim · model-written summary
Gravistimulation changes pulvinus responsiveness to both IAA and GA3, with the change unique to each regulator.
- Taxon
- Avena sativaAvena sativae0
- Treatment
- gravistimulatione1
- Outcome
- pulvinus responsiveness to both IAA and GA3e1
- Direction
- changese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pulvini of excised segments from oats (Avena sativa L. cv Victory)”
e1“gravistimulation produces changes in pulvinus responsiveness to both IAA and GA3”
Claim · model-written summary
The changes in responsiveness may result from cellular-level processes other than changes in hormonal sensitivity.
- Taxon
- Avena sativaAvena sativae0
- Outcome
- changes in responsivenesse2
- Qualifier
- processes at the cellular level other than changes in hormonal sensitivitye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pulvini of excised segments from oats (Avena sativa L. cv Victory)”
e2“the changes in responsiveness may result from processes at the cellular level other than changes in hormonal sensitivity”
The same questions in other papers
Gibberellic acid · growth · Avena sativa (oats)Positive and negative results
17 in the opposite direction
- positive
- positive
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14 papers more in this group
See all 18 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.