Abstract
The effects of auxin on net ion fluxes near parenchyma of oat coleoptiles were studied using the non-invasive MIFE system to measure specific ion fluxes using ion selective microelectrodes. Application of 10 1-naphthaleneacetic acid (NAA) for 3 h caused doubling of coleoptile segment growth, without changing the pH of the unbuffered bathing solution from pH 5n4 during that time. Short term experiments revealed that auxin led to an immediate three-fold increase of chloride influx to 1200 nmol m -# s -" , maintained for at least 1 h. In the first minutes after auxin application, proton fluxes were small (k25 nmol m -# s -" , an efflux) and tended to decrease, whereas potassium and calcium fluxes changed little, fluctuating from k100 to 0 nmol m -# s -" and from k15 to 0 nmol m -# s -" , respectively. It is suggested that one target of auxin action in plant cells is the plasma membrane chloride transport system mediating increased chloride uptake.
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Claims 6
Claim · model-written summary
NAA doubled oat coleoptile segment growth after 3 h.
- Taxon
- Oat
Avena sativat0 - Organ / stage
- coleoptilee0
- Treatment
- 10 1-naphthaleneacetic acid (NAA)e0
- Outcome
- coleoptile segment growthe0
- Direction
- doublinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of 10 1-naphthaleneacetic acid (NAA) for 3 h caused doubling of coleoptile segment growth, without changing the pH of the unbuffered bathing solution from pH 5n4 during that time.”
t0“Oat Coleoptiles”
Claim · model-written summary
NAA did not change bathing-solution pH over 3 h.
- Taxon
- OatAvena sativat0
- Treatment
- 10 1-naphthaleneacetic acid (NAA)e0
- Outcome
- pH of the unbuffered bathing solutione0
- Direction
- without changinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of 10 1-naphthaleneacetic acid (NAA) for 3 h caused doubling of coleoptile segment growth, without changing the pH of the unbuffered bathing solution from pH 5n4 during that time.”
t0“Oat Coleoptiles”
Claim · model-written summary
Auxin immediately tripled chloride influx in oat coleoptiles, sustained at least 1 h.
- Taxon
- OatAvena sativat0
- Treatment
- auxine0
- Outcome
- chloride influxe0
- Direction
- increasee0
- Value
- 1200 nmol m -# s -"e0
- Qualifier
- at least 1 he0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“auxin led to an immediate three-fold increase of chloride influx to 1200 nmol m -# s -" , maintained for at least 1 h”
t0“Oat Coleoptiles”
Claim · model-written summary
Proton fluxes were small and tended to decrease after auxin application.
- Taxon
- OatAvena sativat0
- Treatment
- auxin applicatione1
- Outcome
- proton fluxese0
- Direction
- decreasee0
- Value
- k25 nmol m -# s -"e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“proton fluxes were small (k25 nmol m -# s -" , an efflux) and tended to decrease”
t0“Oat Coleoptiles”
e1“after auxin application”
Claim · model-written summary
Potassium and calcium fluxes changed little after auxin.
- Taxon
- OatAvena sativat0
- Treatment
- auxin applicatione1
- Outcome
- potassium and calcium fluxese0
- Direction
- changed littlee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“potassium and calcium fluxes changed little, fluctuating from k100 to 0 nmol m -# s -" and from k15 to 0 nmol m -# s -" , respectively”
t0“Oat Coleoptiles”
e1“after auxin application”
Claim · model-written summary
The authors suggest plasma membrane chloride transport is a target of auxin action that increases chloride uptake.
- Taxon
- OatAvena sativat0
- Outcome
- increased chloride uptakee0
- Qualifier
- plasma membrane chloride transport systeme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“one target of auxin action in plant cells is the plasma membrane chloride transport system mediating increased chloride uptake”
t0“Oat Coleoptiles”
The same questions in other papers
1-naphthaleneacetic acid · growth · Avena sativa (oats)Results agree
1 paper in the same direction as this paper
- positive
class · nutrient: content · Avena sativa (oats)Positive and negative results
1 in the opposite direction
- positive
class · molecular: metabolites · Avena sativa (oats)Positive and negative results
1 paper in the same direction as this paper · 4 in the opposite direction
- no effect
- no effect
- no effect
2 papers more in this group
See all 6 papers →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.