Abstract
S ummary The capacity of bean petiole segments to transport 14 C‐indole‐3‐acetic acid decreases to approximately half within 5 hours of excision and to less than one‐tenth after 10 hours. Exposure of the segments to ethylene enhances this loss in capacity, but pretreatment with an auxin completely protects the transport system from both the natural and ethylene‐induced fall. A decrease in synthesis of protein accompanies the natural loss of transport capacity, and treatments with auxin or kinetin which retain synthesis also retain transport. Only auxin treatments protect against the effects of ethylene. To correlate these results, a theoretical model for polar transport is developed in which it is proposed that auxin molecules are bound to a specific carrier protein sited at the plasmalemma. Transport capacity could be regulated by the rate of synthesis of the carrier protein, with a secondary regulation of the activity of the carrier by the binding of either auxin or ethylene molecules to specific sites on the protein.
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Claims 8
Claim · model-written summary
Excision reduced bean petiole auxin transport capacity to about half by five hours.
Verbatim
e0“The capacity of bean petiole segments to transport 14 C‐indole‐3‐acetic acid decreases to approximately half within 5 hours of excision”
Claim · model-written summary
Excision reduced transport capacity below one-tenth by ten hours.
Verbatim
e0“The capacity of bean petiole segments to transport 14 C‐indole‐3‐acetic acid decreases to approximately half within 5 hours of excision and to less than one‐tenth after 10 hours.”
Claim · model-written summary
Ethylene enhanced the loss of auxin transport capacity.
- Taxon
- PHASEOLUS VULGARIS
Phaseolus vulgarist0 - Treatment
- ethylenee0
- Outcome
- loss in capacitye0
- Direction
- enhancese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure of the segments to ethylene enhances this loss in capacity”
t0“PHASEOLUS VULGARIS”
Claim · model-written summary
Auxin pretreatment protected transport capacity against natural and ethylene-induced decline.
- Taxon
- PHASEOLUS VULGARISPhaseolus vulgarist0
- Treatment
- pretreatment with an auxine0
- Outcome
- transport systeme0
- Direction
- protectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“pretreatment with an auxin completely protects the transport system from both the natural and ethylene‐induced fall.”
t0“PHASEOLUS VULGARIS”
Claim · model-written summary
Protein synthesis declined with natural transport capacity loss.
- Taxon
- PHASEOLUS VULGARISPhaseolus vulgarist0
- Gene
- proteine0
- Outcome
- synthesis of proteine0
- Direction
- decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A decrease in synthesis of protein accompanies the natural loss of transport capacity”
t0“PHASEOLUS VULGARIS”
Claim · model-written summary
Auxin maintained protein synthesis and transport.
- Taxon
- PHASEOLUS VULGARISPhaseolus vulgarist0
- Treatment
- auxine0
- Outcome
- synthesis also retain transporte0
- Direction
- retaine0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“treatments with auxin or kinetin which retain synthesis also retain transport.”
t0“PHASEOLUS VULGARIS”
Claim · model-written summary
Kinetin maintained protein synthesis and transport.
- Taxon
- PHASEOLUS VULGARISPhaseolus vulgarist0
- Treatment
- kinetine0
- Outcome
- synthesis also retain transporte0
- Direction
- retaine0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“treatments with auxin or kinetin which retain synthesis also retain transport.”
t0“PHASEOLUS VULGARIS”
Claim · model-written summary
Only auxin protected against ethylene effects.
- Taxon
- PHASEOLUS VULGARISPhaseolus vulgarist0
- Treatment
- auxin treatmentse0
- Outcome
- effects of ethylenee0
- Direction
- protecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Only auxin treatments protect against the effects of ethylene.”
t0“PHASEOLUS VULGARIS”
The same questions in other papers
class · physiology: hormones · Phaseolus vulgaris (common bean)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- 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.