Abstract
The comparative effects of metabolic inhibitors on acid- and auxininduced growth in oat (Avena sativa L. var. Victory) coleoptile segments have been examined. Acid (pH 4)-induced growth in both peeled and unpeeled segments is inhibited by 1 millimolar KCN when added at the time of acidification. KCN inhibits total acid-induced growth by 59 and 76%, respectively, in peeled and nonpeeled segments during the first 60 minutes. The growth rate of cyanide-treated tissue drops to zero or near zero in both peeled and nonpeeled segments during this period. Cyanide inhibition of total acid-induced growth in peeled segments at pH 5 is even more severe, amounting to about 80% during the first 60 minutes. The possibility that inhibition by cyanide may be caused by some nonspecific effect of the inhibitor on a process other than respiration, e.g. turgor reduction due to membrane damage, has not been ruled out. Acid-induced growth is also inhibited by 3 millimolar sodium fluoride and by anoxia. In unpeeled segments total pH 4-induced growth is inhibited 73% by sodium fluoride and 38% by anoxia during the 1st hour. Possible corrections to the above inhibition percentages which may be necessary due to the sensitivity of basal growth to inhibitors are discussed. Cyanide was found to inhibit auxin-induced growth much more rapidly than acid-induced growth. These data suggest that acid growth may be dependent on respiratory metabolism but to a lesser degree than is auxin-induced growth. If the acid growth theory of auxin action is correct, it appears that there may be two steps in the growth process which are dependent on respiratory metabolism: (a) auxin-induced proton pumping which is highly sensitive to respiratory inhibitors; and (b) acid-mediated wall loosening which is moderately and perhaps indirectly sensitive to respiratory inhibitors.
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Claims 10
Claim · model-written summary
1 millimolar KCN added at the time of acidification inhibited acid (pH 4)-induced growth in both peeled and unpeeled oat coleoptile segments.
- Taxon
- oat
Avena sativae0 - Organ / stage
- peeled and unpeeled segmentse1
- Treatment
- 1 millimolar KCNe1
- Outcome
- Acid (pH 4)-induced growthe1
- Direction
- inhibitede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oat (Avena sativa L. var. Victory) coleoptile segments”
e1“Acid (pH 4)-induced growth in both peeled and unpeeled segments is inhibited by 1 millimolar KCN when added at the time of acidification”
Claim · model-written summary
KCN inhibited total acid-induced growth by 59% in peeled oat coleoptile segments during the first 60 minutes.
- Taxon
- oatAvena sativae0
- Organ / stage
- peelede1
- Treatment
- KCNe1
- Outcome
- total acid-induced growthe1
- Direction
- inhibitse1
- Value
- 59e1
- Qualifier
- during the first 60 minutese1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oat (Avena sativa L. var. Victory) coleoptile segments”
e1“KCN inhibits total acid-induced growth by 59 and 76%, respectively, in peeled and nonpeeled segments during the first 60 minutes”
Claim · model-written summary
KCN inhibited total acid-induced growth by 76% in nonpeeled oat coleoptile segments during the first 60 minutes.
- Taxon
- oatAvena sativae0
- Organ / stage
- nonpeelede1
- Treatment
- KCNe1
- Outcome
- total acid-induced growthe1
- Direction
- inhibitse1
- Value
- 76%e1
- Qualifier
- during the first 60 minutese1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oat (Avena sativa L. var. Victory) coleoptile segments”
e1“KCN inhibits total acid-induced growth by 59 and 76%, respectively, in peeled and nonpeeled segments during the first 60 minutes”
Claim · model-written summary
The growth rate of cyanide-treated tissue dropped to zero or near zero in both peeled and nonpeeled segments during the first 60 minutes.
- Taxon
- oatAvena sativae0
- Organ / stage
- peeled and nonpeeled segmentse1
- Treatment
- cyanide-treatede1
- Outcome
- growth ratee1
- Direction
- drops to zero or near zeroe1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oat (Avena sativa L. var. Victory) coleoptile segments”
e1“The growth rate of cyanide-treated tissue drops to zero or near zero in both peeled and nonpeeled segments during this period”
Claim · model-written summary
At pH 5, cyanide inhibited total acid-induced growth in peeled segments by about 80% during the first 60 minutes, more severely than at pH 4.
- Taxon
- oatAvena sativae0
- Organ / stage
- peeled segmentse1
- Treatment
- Cyanidee1
- Outcome
- total acid-induced growthe1
- Direction
- inhibitione1
- Value
- about 80%e1
- Qualifier
- pH 5e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oat (Avena sativa L. var. Victory) coleoptile segments”
e1“Cyanide inhibition of total acid-induced growth in peeled segments at pH 5 is even more severe, amounting to about 80% during the first 60 minutes”
Claim · model-written summary
Sodium fluoride inhibited total pH 4-induced growth by 73% in unpeeled oat coleoptile segments during the first hour.
- Taxon
- oatAvena sativae0
- Organ / stage
- unpeeled segmentse1
- Treatment
- sodium fluoridee1
- Outcome
- total pH 4-induced growthe1
- Direction
- inhibitede1
- Value
- 73%e1
- Qualifier
- during the 1st houre1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oat (Avena sativa L. var. Victory) coleoptile segments”
e1“In unpeeled segments total pH 4-induced growth is inhibited 73% by sodium fluoride and 38% by anoxia during the 1st hour”
Claim · model-written summary
Anoxia inhibited total pH 4-induced growth by 38% in unpeeled oat coleoptile segments during the first hour.
- Taxon
- oatAvena sativae0
- Organ / stage
- unpeeled segmentse1
- Treatment
- anoxiae1
- Outcome
- total pH 4-induced growthe1
- Direction
- inhibitede1
- Value
- 38%e1
- Qualifier
- during the 1st houre1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oat (Avena sativa L. var. Victory) coleoptile segments”
e1“In unpeeled segments total pH 4-induced growth is inhibited 73% by sodium fluoride and 38% by anoxia during the 1st hour”
Claim · model-written summary
Cyanide inhibited auxin-induced growth much more rapidly than acid-induced growth.
- Taxon
- oatAvena sativae0
- Treatment
- Cyanidee1
- Outcome
- auxin-induced growthe1
- Direction
- inhibite1
- Qualifier
- much more rapidlye1
- Comparator
- acid-induced growthe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oat (Avena sativa L. var. Victory) coleoptile segments”
e1“Cyanide was found to inhibit auxin-induced growth much more rapidly than acid-induced growth”
Claim · model-written summary
The authors suggest that acid growth may depend on respiratory metabolism, but to a lesser degree than auxin-induced growth.
- Taxon
- oatAvena sativae0
- Outcome
- acid growthe1
- Qualifier
- dependent on respiratory metabolism but to a lesser degree than is auxin-induced growthe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oat (Avena sativa L. var. Victory) coleoptile segments”
e1“These data suggest that acid growth may be dependent on respiratory metabolism but to a lesser degree than is auxin-induced growth”
Claim · model-written summary
If the acid growth theory of auxin action is correct, there may be two respiration-dependent steps in the growth process: auxin-induced proton pumping, highly sensitive to respiratory inhibitors, and acid-mediated wall loosening, moderately and perhaps indirectly sensitive.
- Taxon
- oatAvena sativae0
- Outcome
- two steps in the growth processe1
- Qualifier
- dependent on respiratory metabolisme1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oat (Avena sativa L. var. Victory) coleoptile segments”
e1“it appears that there may be two steps in the growth process which are dependent on respiratory metabolism”
The same questions in other papers
potassium cyanide · growth · Avena sativa (oats)Results agree
1 paper in the same direction as this paper
- negative
flooding · growth · Avena sativa (oats)Results agree
4 papers in the same direction as this paper
- negative
- negative
- negative
1 paper more in this group
See all 5 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.