Abstract
Transport of indoleacetic acid-1(14)C following application to the buds of intact white ash (Fraxinus americana L.) shoots proceeds at a velocity of about 1.3 centimeters per hour in actively growing seedlings, but only 0.3 centimeter per hour in dormant seedlings. The rapid movement is metabolically controlled, and at 1 C or in a nitrogen environment it is reduced to 0.2 centimeter per hour, suggesting that the slower movement is due to diffusion. The transport profile for growing shoots shows a logarithmic decrease in activity in stems treated for 3 hours. However, over longer treatment intervals, especially after 12 hours, a steady state of recoverable activity occurs in the more basal stem segments. Cold-treated shoots acquire the capacity for rapid transport 7 days after they are placed into favorable growing conditions, at which time dormancy callose disappears from the phloem, respiratory activity of the stem tissue increases, and mitotic reactivation occurs in the bud. Following shoot reactivation, the velocity and amount of exogenously supplied indoleacetic acid transported remained relatively uniform until the onset of the succeeding dormant period. Five per cent, or less, of the applied tracer moves into the shoot, with substantial portions remaining as indoleacetic acid.
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Claims 11
Claim · model-written summary
Auxin transport velocity was about 1.3 cm/h in active seedlings versus 0.3 cm/h in dormant seedlings.
- Taxon
- white ash
Fraxinus americanae0 - Organ / stage
- shootse0
- Compound
- indoleacetic acid-1(14)Ce0
- Outcome
- velocitye0
- Direction
- onlye0
- Value
- about 1.3 centimeters per houre0
- Qualifier
- only 0.3 centimeter per hour in dormant seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Transport of indoleacetic acid-1(14)C following application to the buds of intact white ash (Fraxinus americana L.) shoots proceeds at a velocity of about 1.3 centimeters per hour in actively growing seedlings, but only 0.3 centimeter per hour in dormant seedlings”
Claim · model-written summary
At 1 C or under nitrogen, transport velocity fell to 0.2 cm/h.
- Taxon
- white ashFraxinus americanat0
- Treatment
- 1 C or in a nitrogen environmente0
- Outcome
- velocityt1
- Direction
- reducede0
- Value
- 0.2 centimeter per houre0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at 1 C or in a nitrogen environment it is reduced to 0.2 centimeter per hour”
t0“White Ash”
t1“a velocity of about 1.3 centimeters per hour”
Claim · model-written summary
Activity in growing stems showed a logarithmic decrease over three hours.
- Taxon
- White AshFraxinus americanat0
- Organ / stage
- growing shootse0
- Outcome
- activity in stemse0
- Direction
- logarithmic decreasee0
- Qualifier
- 3 hourse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The transport profile for growing shoots shows a logarithmic decrease in activity in stems treated for 3 hours”
t0“White Ash”
Claim · model-written summary
After 12 hours, more basal stem segments reached steady recoverable activity.
- Taxon
- White AshFraxinus americanat0
- Organ / stage
- more basal stem segmentse0
- Outcome
- steady state of recoverable activitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“especially after 12 hours, a steady state of recoverable activity occurs in the more basal stem segments”
t0“White Ash”
Claim · model-written summary
Cold-treated shoots regained rapid transport seven days after favorable growing conditions began.
- Taxon
- White AshFraxinus americanat0
- Organ / stage
- Cold-treated shootse0
- Outcome
- capacity for rapid transporte0
- Value
- 7 dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cold-treated shoots acquire the capacity for rapid transport 7 days after they are placed into favorable growing conditions”
t0“White Ash”
Claim · model-written summary
Dormancy callose disappeared from phloem during shoot reactivation.
- Taxon
- White AshFraxinus americanat0
- Organ / stage
- phloeme0
- Outcome
- dormancy callose disappearse0
- Direction
- disappearse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“dormancy callose disappears from the phloem”
t0“White Ash”
Claim · model-written summary
Stem respiratory activity increased during shoot reactivation.
- Taxon
- White AshFraxinus americanat0
- Outcome
- respiratory activity of the stem tissuee0
- Direction
- increasese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“respiratory activity of the stem tissue increases”
t0“White Ash”
Claim · model-written summary
Mitotic reactivation occurred in buds during shoot reactivation.
- Taxon
- White AshFraxinus americanat0
- Organ / stage
- bude0
- Outcome
- mitotic reactivation occurse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“mitotic reactivation occurs in the bud”
t0“White Ash”
Claim · model-written summary
After reactivation, exogenous auxin transport velocity and amount remained relatively uniform until dormancy resumed.
- Taxon
- White AshFraxinus americanat0
- Outcome
- velocity and amount of exogenously supplied indoleacetic acid transportede0
- Direction
- remained relatively uniforme0
- Qualifier
- until the onset of the succeeding dormant periode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Following shoot reactivation, the velocity and amount of exogenously supplied indoleacetic acid transported remained relatively uniform until the onset of the succeeding dormant period”
t0“White Ash”
Claim · model-written summary
At most five percent of applied tracer moved into the shoot.
- Taxon
- White AshFraxinus americanat0
- Outcome
- applied tracer moves into the shoote0
- Value
- Five per cent, or lesse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Five per cent, or less, of the applied tracer moves into the shoot”
t0“White Ash”
Claim · model-written summary
Substantial portions of applied tracer remained as indoleacetic acid.
- Taxon
- White AshFraxinus americanat0
- Outcome
- substantial portions remaining as indoleacetic acide0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“substantial portions remaining as indoleacetic acid”
t0“White Ash”