Abstract
The direction and extent of GA transport in Pinto beans has been studied. The increase in growth rate was used as a measure of the amount of GA which reached the stem apex. The evidence showed that a similar increase in stem growth occurred whether GA was applied to the first trifoliolate leaf or to the apex of the shoot, but considerably less elongation resulted when GA was applied to primary leaves. When leaves were treated with GA after remaining in darkness for extended times, no increase in stem elongation was observed; however, growth was promoted when the plants were returned to light. The time required for a sufficient amount of GA to be translocated from the leaf to increase stem growth is less than 1 hour. The maximum growth response was found when the treated leaf was left on the plant for 3 or more hours. A study of GA movement in two‐branched plants was made. The untreated branch showed no growth response when GA was applied to the apex of the other branch, even if the dose of GA was 20 × greater than a saturating dose. Similar results were observed when GA was applied to the first trifoliolate leaf. Considerable GA moved from a mature leaf to the opposite shoot if this untreated branch had been defoliated. The pattern of GA movement to the opposite shoot was dependent on the position of the treated leaf on the shoot. It is concluded that the movement of applied GA is related to carbohydrate transport within the plant.
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Claims 11
Claim · model-written summary
GA applied to a trifoliolate leaf or shoot apex caused similar increases in stem growth.
Verbatim
e0“a similar increase in stem growth occurred whether GA was applied to the first trifoliolate leaf or to the apex of the shoot”
t0“BEAN SEEDLINGS”
Claim · model-written summary
GA application to primary leaves produced considerably less elongation.
Not reportedComparator
Verbatim
e0“considerably less elongation resulted when GA was applied to primary leaves”
t0“BEAN SEEDLINGS”
Claim · model-written summary
GA treatment after prolonged darkness did not increase stem elongation.
- Taxon
- BEAN SEEDLINGSt0
- Treatment
- treated with GA after remaining in darkness for extended timese0
- Outcome
- stem elongatione0
- Direction
- no increasee0
Not reportedComparator
Verbatim
e0“When leaves were treated with GA after remaining in darkness for extended times, no increase in stem elongation was observed”
t0“BEAN SEEDLINGS”
Claim · model-written summary
Growth was promoted after GA-treated plants were returned to light.
Not reportedComparator
Verbatim
e0“growth was promoted when the plants were returned to light”
t0“BEAN SEEDLINGS”
Claim · model-written summary
GA translocated from leaf sufficiently to increase stem growth in less than one hour.
Verbatim
e0“The time required for a sufficient amount of GA to be translocated from the leaf to increase stem growth is less than 1 hour”
t0“BEAN SEEDLINGS”
Claim · model-written summary
Maximum growth response occurred when the treated leaf remained on the plant at least three hours.
Verbatim
e0“The maximum growth response was found when the treated leaf was left on the plant for 3 or more hours”
t0“BEAN SEEDLINGS”
Claim · model-written summary
An untreated branch did not respond to GA applied to the other branch apex, even at a high dose.
Verbatim
e0“The untreated branch showed no growth response when GA was applied to the apex of the other branch, even if the dose of GA was 20 × greater than a saturating dose”
t0“BEAN SEEDLINGS”
Claim · model-written summary
Application to the first trifoliolate leaf similarly produced no untreated-branch response.
- Taxon
- BEAN SEEDLINGSt0
- Treatment
- GA was applied to the first trifoliolate leafe0
- Outcome
- Similar resultse0
Not reportedComparatorDirection
Verbatim
e0“Similar results were observed when GA was applied to the first trifoliolate leaf”
t0“BEAN SEEDLINGS”
Claim · model-written summary
Considerable GA moved from a mature leaf to the opposite shoot when that branch was defoliated.
- Taxon
- BEAN SEEDLINGSt0
- Treatment
- defoliatede0
- Outcome
- GA moved from a mature leaf to the opposite shoote0
- Direction
- Considerablee0
Not reportedComparator
Verbatim
e0“Considerable GA moved from a mature leaf to the opposite shoot if this untreated branch had been defoliated”
t0“BEAN SEEDLINGS”
Claim · model-written summary
GA movement to the opposite shoot depended on treated-leaf position.
- Taxon
- BEAN SEEDLINGSt0
- Organ / stage
- treated leafe0
- Outcome
- pattern of GA movement to the opposite shoote0
Not reportedDirection
Verbatim
e0“The pattern of GA movement to the opposite shoot was dependent on the position of the treated leaf on the shoot”
t0“BEAN SEEDLINGS”
Claim · model-written summary
The authors conclude that applied GA movement is related to carbohydrate transport.
Not reportedDirection
Verbatim
e0“the movement of applied GA is related to carbohydrate transport within the plant”
t0“BEAN SEEDLINGS”
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