Abstract
Purves, W. K., and A. W. Galston. (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 “S1” 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 9
Claim · model-written summary
The IAA concentration for maximum elongation shifted from about 10–4 M without sucrose to 10–7 M at 2% sucrose.
- 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
t0“Pea Epicotyl Section Growth”
e0“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”
Claim · model-written summary
High IAA inhibited elongation only with sucrose present.
- Taxon
- PeaLathyrus oleraceust0
- Treatment
- high levels of IAAe0
- Outcome
- elongatione0
- Direction
- inhibitorye0
- Qualifier
- presence of sucrosee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Pea Epicotyl Section Growth”
e0“the inhibitory action of high levels of IAA on elongation occurs only in the presence of sucrose”
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
t0“Pea Epicotyl Section Growth”
e0“sucrose also promotes water uptake”
Claim · model-written summary
Sucrose affected the IAA optimum for water uptake only slightly.
- Taxon
- PeaLathyrus oleraceust0
- Treatment
- sucrosee0
- Outcome
- IAA optimume0
- Direction
- only slightlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Pea Epicotyl Section Growth”
e0“although sucrose also promotes water uptake, it affects the IAA optimum for this process only slightly”
Claim · model-written summary
IAA action on growth was immediate, while sucrose response began after a 6–8 hour lag.
- Taxon
- PeaLathyrus oleraceust0
- Outcome
- growth response to sucrosee0
- Value
- 6–8 hr.e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Pea Epicotyl Section Growth”
e0“The action of IAA on growth can be detected immediately, but the growth response to sucrose occurs only after a 6–8 hr. lag”
Claim · model-written summary
With sucrose, one-hour IAA exposures could match continuous 20-hour exposure for growth 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
t0“Pea Epicotyl Section Growth”
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”
Claim · model-written summary
At 2% sucrose, 10—4 M IAA 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
t0“Pea Epicotyl Section Growth”
e0“10—4 M IAA applied in the presence of 2% sucrose is markedly inhibitory to elongation in hours 1–3”
Claim · model-written summary
At 2% sucrose, 10—4 M IAA was relatively inactive for elongation in hours 4–6.
- Taxon
- PeaLathyrus oleraceust0
- Treatment
- 10—4 M IAA applied in the presence of 2% sucrosee0
- Outcome
- elongatione0
- Direction
- relatively inactivee0
- Qualifier
- hours 4–6e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Pea Epicotyl Section Growth”
e0“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”
Claim · model-written summary
At 2% sucrose, 10—4 M IAA promoted elongation after hour 7.
- Taxon
- PeaLathyrus oleraceust0
- Treatment
- 10—4 M IAA applied in the presence of 2% sucrosee0
- Outcome
- elongatione0
- Direction
- strongly promotivee0
- Qualifier
- after hour 7e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Pea Epicotyl Section Growth”
e0“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 same questions in other papers
indole-3-acetic acid · growth · Lathyrus oleraceus (pea)Results differ
32 papers in the same direction as this paper · 14 in the opposite direction
- positive
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See all 47 papers →sucrose · growth · Lathyrus oleraceus (pea)Positive and negative results
7 papers in the same direction as this paper · 3 in the opposite direction
- positive
- no effect
- no effect
7 papers more in this group
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.