Abstract
Scott, Tom K., and Winslow R. Briggs. (Stanford U., Stanford, Calif.) Recovery of native and applied auxin from the light-grown ‘Alaska’ pea seedling. Amer. Jour. Bot. 49(10): 1056–1063. Illus. 1962.—The physiological status of both endogenous and exogenously applied auxin was compared in the epicotyl of the 9-day-old light-grown ‘Alaska’ pea (Pisum sativum L.) by means of agar-diffusion and short-term ether extraction. A detailed analysis of endogenous auxin revealed a linear basipetal decrease in diffusible auxin within the growing region. A decrease in extractable auxin occurred only within the most mature region. The capacity for uptake of indole-3-acetic acid (IAA), applied in lanolin paste, was compared in different regions of the epicotyl. The fifth and most apical internode had the greatest capacity for uptake as measured by extraction. A reduced capacity was found in more basal internodes. The transport rate of applied IAA, under conditions of optimal uptake, was 10–12 mm/hr. An application of IAA for 24 hr resulted in a dramatic increase in auxin content throughout the length of the epicotyl compared to that found in the normal control. There was no apparent gradation in content from apex to base. An increase of diffusible auxin was also found, but only in the fourth and third internodes. That no such increase was detected in the basal 3 internodes suggested that the auxin transport system within this region had special properties related to a transition between shoot and root vascular patterns.
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Claims 9
Claim · model-written summary
Diffusible endogenous auxin decreased linearly toward the base in the growing epicotyl region.
- Taxon
- Pea Seedling
Lathyrus oleraceust0 - Organ / stage
- growing regione0
- Outcome
- diffusible auxine0
- Direction
- linear basipetal decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“endogenous auxin revealed a linear basipetal decrease in diffusible auxin within the growing region”
t0“'Alaska' Pea Seedling”
Claim · model-written summary
Extractable auxin decreased only in the most mature epicotyl region.
- Taxon
- Pea SeedlingLathyrus oleraceust0
- Organ / stage
- most mature regione0
- Outcome
- extractable auxine0
- Direction
- decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A decrease in extractable auxin occurred only within the most mature region.”
t0“'Alaska' Pea Seedling”
Claim · model-written summary
The fifth, most apical internode had the greatest capacity to take up applied IAA.
- Taxon
- Pea SeedlingLathyrus oleraceust0
- Organ / stage
- fifth and most apical internodee0
- Outcome
- capacity for uptakee0
- Direction
- greateste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The fifth and most apical internode had the greatest capacity for uptake as measured by extraction.”
t0“'Alaska' Pea Seedling”
Claim · model-written summary
More basal internodes had reduced IAA uptake capacity.
- Taxon
- Pea SeedlingLathyrus oleraceust0
- Organ / stage
- more basal internodese0
- Outcome
- capacitye0
- Direction
- reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A reduced capacity was found in more basal internodes.”
t0“'Alaska' Pea Seedling”
Claim · model-written summary
Applied IAA moved at 10–12 mm/hr under optimal uptake conditions.
- Taxon
- Pea SeedlingLathyrus oleraceust0
- Outcome
- transport rate of applied IAAe0
- Value
- 10–12 mm/hre0
- Qualifier
- under conditions of optimal uptakee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The transport rate of applied IAA, under conditions of optimal uptake, was 10–12 mm/hr.”
t0“'Alaska' Pea Seedling”
Claim · model-written summary
A 24 hour IAA application dramatically increased auxin throughout the epicotyl versus control.
- Taxon
- Pea SeedlingLathyrus oleraceust0
- Organ / stage
- epicotyle0
- Treatment
- application of IAA for 24 hre0
- Outcome
- auxin contente0
- Direction
- dramatic increasee0
- Comparator
- normal controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An application of IAA for 24 hr resulted in a dramatic increase in auxin content throughout the length of the epicotyl compared to that found in the normal control.”
t0“'Alaska' Pea Seedling”
Claim · model-written summary
After IAA application, auxin content showed no apex-to-base gradient.
- Taxon
- Pea SeedlingLathyrus oleraceust0
- Organ / stage
- apex to basee0
- Outcome
- gradation in contente0
- Direction
- no apparent gradatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no apparent gradation in content from apex to base.”
t0“'Alaska' Pea Seedling”
Claim · model-written summary
Diffusible auxin increased only in the fourth and third internodes.
- Taxon
- Pea SeedlingLathyrus oleraceust0
- Organ / stage
- fourth and third internodese0
- Outcome
- diffusible auxine0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An increase of diffusible auxin was also found, but only in the fourth and third internodes.”
t0“'Alaska' Pea Seedling”
Claim · model-written summary
The basal three internodes lacked this increase in diffusible auxin.
- Taxon
- Pea SeedlingLathyrus oleraceust0
- Organ / stage
- basal 3 internodese0
- Outcome
- increasee0
- Direction
- no such increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no such increase was detected in the basal 3 internodes”
t0“'Alaska' Pea Seedling”
The same questions in other papers
indole-3-acetic acid · physiology: hormones · Lathyrus oleraceus (pea)Positive and negative results
1 in the opposite direction
- no effect
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.