Abstract
P urves , W. K., and A. W. G alston . (Yale U., New Haven, Conn.) Interaction of sugars and auxins in pea epicotyl section growth. Amer. Jour. Bot. 47 (8): 665–669. Illus. 1963.—The nature and magnitude of the response of “S 1 ” etiolated pea‐epicotyl sections to auxin are determined by the concentration of sugar in the growth medium. For example, the concentration of IAA inducing maximum elongation shifts through at least 3 orders of magnitude in response to varying sucrose concentrations, from ca. 10 –4 M, with no sucrose, to 10 –7 M, with 2% sucrose. Similarly, the inhibitory action of high levels of IAA on elongation occurs only in the presence of sucrose. By contrast, although sucrose also promotes water uptake, it affects the IAA optimum for this process only slightly. The action of IAA on growth can be detected immediately, but the growth response to sucrose occurs only after a 6–8 hr. lag. If tissues are supplied with sucrose, then 1‐hr. exposures to IAA can be as effective on growth as continuous 20‐hr. exposures, depending on the time at which such exposures are given. Thus, 10 —4 M IAA applied in the presence of 2% sucrose is markedly inhibitory to elongation in hours 1–3, relatively inactive in hours 4–6, and strongly promotive after hour 7. The change from inhibitory to promotive action thus coincides in time with the length of the lag period for sucrose action.
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Claims 10
Claim · model-written summary
Sucrose concentration shifts the IAA concentration for maximum pea epicotyl elongation across at least three orders of magnitude.
- Taxon
- PEA
Lathyrus oleraceust0 - Treatment
- varying sucrose concentrationse0
- Outcome
- concentration of IAA inducing maximum elongatione0
- Direction
- shiftse0
- Value
- at least 3 orders of magnitudee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“concentration of IAA inducing maximum elongation shifts through at least 3 orders of magnitude in response to varying sucrose concentrations, from ca. 10 –4 M, with no sucrose, to 10 –7 M, with 2% sucrose”
t0“PEA EPICOTYL SECTION GROWTH”
Claim · model-written summary
High IAA inhibited elongation only with sucrose.
- Taxon
- PEALathyrus oleraceust0
- Treatment
- high levels of IAAe0
- Outcome
- elongatione0
- Direction
- inhibitorye0
- Qualifier
- in the presence of sucrosee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“inhibitory action of high levels of IAA on elongation occurs only in the presence of sucrose”
t0“PEA EPICOTYL SECTION GROWTH”
Claim · model-written summary
Sucrose promoted water uptake.
- Taxon
- PEALathyrus oleraceust0
- Treatment
- sucrosee0
- Outcome
- water uptakee0
- Direction
- promotese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sucrose also promotes water uptake”
t0“PEA EPICOTYL SECTION GROWTH”
Claim · model-written summary
Sucrose affected the IAA optimum for water uptake only slightly.
- Taxon
- PEALathyrus oleraceust0
- Treatment
- sucrosee1
- Outcome
- IAA optimume0
- Qualifier
- only slightlye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it affects the IAA optimum for this process only slightly”
e1“sucrose also promotes water uptake”
t0“PEA EPICOTYL SECTION GROWTH”
Claim · model-written summary
IAA growth action was detectable immediately.
- Taxon
- PEALathyrus oleraceust0
- Treatment
- IAAe0
- Outcome
- action of IAA on growthe0
- Qualifier
- immediatelye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“action of IAA on growth can be detected immediately”
t0“PEA EPICOTYL SECTION GROWTH”
Claim · model-written summary
The sucrose growth response followed a 6–8 hour lag.
- Taxon
- PEALathyrus oleraceust0
- Treatment
- sucrosee0
- Outcome
- growth response to sucrosee0
- Value
- 6–8 hr.e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“growth response to sucrose occurs only after a 6–8 hr. lag”
t0“PEA EPICOTYL SECTION GROWTH”
Claim · model-written summary
With sucrose, one-hour IAA exposures could be as effective for growth as continuous 20-hour exposures, depending on timing.
- Taxon
- PEALathyrus oleraceust0
- Treatment
- 1‐hr. exposures to IAAe0
- Outcome
- growthe0
- Direction
- as effectivee0
- Qualifier
- depending on the time at which such exposures are givene0
- Comparator
- continuous 20‐hr. exposurese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“If tissues are supplied with sucrose, then 1‐hr. exposures to IAA can be as effective on growth as continuous 20‐hr. exposures, depending on the time at which such exposures are given”
t0“PEA EPICOTYL SECTION GROWTH”
Claim · model-written summary
IAA with sucrose inhibited elongation in hours 1–3.
- Taxon
- PEALathyrus oleraceust0
- Treatment
- 10 —4 M IAA applied in the presence of 2% sucrosee0
- Outcome
- elongatione0
- Direction
- inhibitorye0
- Qualifier
- hours 1–3e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“10 —4 M IAA applied in the presence of 2% sucrose is markedly inhibitory to elongation in hours 1–3”
t0“PEA EPICOTYL SECTION GROWTH”
Claim · model-written summary
IAA with sucrose was relatively inactive on elongation in hours 4–6.
- Taxon
- PEALathyrus oleraceust0
- Treatment
- 10 —4 M IAA applied in the presence of 2% sucrosee1
- Outcome
- elongatione2
- Direction
- relatively inactivee0
- Qualifier
- hours 4–6e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“relatively inactive in hours 4–6”
e1“10 —4 M IAA applied in the presence of 2% sucrose”
e2“inhibitory to elongation”
t0“PEA EPICOTYL SECTION GROWTH”
Claim · model-written summary
IAA with sucrose strongly promoted elongation after hour 7.
- Taxon
- PEALathyrus oleraceust0
- Treatment
- 10 —4 M IAA applied in the presence of 2% sucrosee1
- Outcome
- elongatione2
- Direction
- strongly promotivee0
- Qualifier
- after hour 7e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“strongly promotive after hour 7”
e1“10 —4 M IAA applied in the presence of 2% sucrose”
e2“inhibitory to elongation”
t0“PEA EPICOTYL SECTION GROWTH”
The same questions in other papers
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- no effect
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See all 47 papers →sucrose · growth · Lathyrus oleraceus (pea)Positive and negative results
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- no effect
- no effect
- no effect
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See all 11 papers →sucrose · physiology: water · Lathyrus oleraceus (pea)Results agree
1 paper in the same direction as this paper
- positive
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.