Abstract
The effects of altered endogenous indole-3-acetic (IAA) levels on elongation in garden pea (Pisum sativum L.) plants were investigated. The auxin transport inhibitors 2,3,5-triiodobenzoic acid (TIBA) and 9-hydroxyfluorene-9-carboxylic acid (HFCA) were applied to elongating internodes of wild-type and mutant Ikb plants. The Ikb mutant was included because elongating Ikb internodes contained 2- to 3-fold less free IAA than those of the wild type. In the wild type, TIBA reduced both the IAA level and internode elongation below the site of application. Both TIBA and HFCA strongly promoted the elongation of Ikb internodes and also raised IAA levels above the application site. The synthetic auxin 2,4dichlorophenoxyacetic acid (2,4-D) also markedly increased internode elongation in 1kb plants and virtually restored petioles and tendrils to their wild-type length. In contrast, treatment of wildtype plants with TIBA, HFCA, or 2,4-D caused little or no increase in elongation above the application site. The ethylene synthesis inhibitor aminoethoxyvinylglycine also increased stem elongation in 1kb plants, and combined application of HFCA and aminoethoxyvinylglycine restored 1kb internodes to the wild-type length. It is concluded that the level of IAA in wild-type internodes is necessary for normal elongation, and that the reduced stature of 1kb plants is at least partially attributable to a reduction in free IAA level in this mutant.
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Claims 17
Claim · model-written summary
Ikb internodes contained 2- to 3-fold less free IAA than wild type.
- Taxon
- garden pea (Pisum sativum L.)
Lathyrus oleraceuse1 - Material
- Ikbe0
- Outcome
- free IAAe0
- Direction
- lesse0
- Value
- 2- to 3-folde0
- Comparator
- wild typee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“elongating Ikb internodes contained 2- to 3-fold less free IAA than those of the wild type”
e1“garden pea (Pisum sativum L.)”
Claim · model-written summary
TIBA reduced IAA below its application site in wild type.
- Taxon
- garden pea (Pisum sativum L.)Lathyrus oleraceuse1
- Material
- wild typee0
- Treatment
- TIBAe0
- Outcome
- IAA levele0
- Direction
- reducede0
- Qualifier
- below the site of applicatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the wild type, TIBA reduced both the IAA level and internode elongation below the site of application”
e1“garden pea (Pisum sativum L.)”
Claim · model-written summary
TIBA reduced internode elongation below its application site in wild type.
- Taxon
- garden pea (Pisum sativum L.)Lathyrus oleraceuse1
- Material
- wild typee0
- Treatment
- TIBAe0
- Outcome
- internode elongatione0
- Direction
- reducede0
- Qualifier
- below the site of applicatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the wild type, TIBA reduced both the IAA level and internode elongation below the site of application”
e1“garden pea (Pisum sativum L.)”
Claim · model-written summary
TIBA strongly promoted Ikb internode elongation.
- Taxon
- garden pea (Pisum sativum L.)Lathyrus oleraceuse1
- Material
- Ikbe0
- Treatment
- TIBAe0
- Outcome
- elongation of Ikb internodese0
- Direction
- strongly promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both TIBA and HFCA strongly promoted the elongation of Ikb internodes”
e1“garden pea (Pisum sativum L.)”
Claim · model-written summary
HFCA strongly promoted Ikb internode elongation.
- Taxon
- garden pea (Pisum sativum L.)Lathyrus oleraceuse1
- Material
- Ikbe0
- Treatment
- HFCAe0
- Outcome
- elongation of Ikb internodese0
- Direction
- strongly promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both TIBA and HFCA strongly promoted the elongation of Ikb internodes”
e1“garden pea (Pisum sativum L.)”
Claim · model-written summary
TIBA raised IAA levels above its application site in Ikb.
- Taxon
- garden pea (Pisum sativum L.)Lathyrus oleraceuse1
- Material
- Ikbe0
- Treatment
- TIBAe0
- Outcome
- IAA levelse0
- Direction
- raisede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both TIBA and HFCA strongly promoted the elongation of Ikb internodes and also raised IAA levels above the application site”
e1“garden pea (Pisum sativum L.)”
Claim · model-written summary
HFCA raised IAA levels above its application site in Ikb.
- Taxon
- garden pea (Pisum sativum L.)Lathyrus oleraceuse1
- Material
- Ikbe0
- Treatment
- HFCAe0
- Outcome
- IAA levelse0
- Direction
- raisede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both TIBA and HFCA strongly promoted the elongation of Ikb internodes and also raised IAA levels above the application site”
e1“garden pea (Pisum sativum L.)”
Claim · model-written summary
2,4-D markedly increased internode elongation in 1kb plants.
- Taxon
- garden pea (Pisum sativum L.)Lathyrus oleraceuse1
- Material
- 1kbe0
- Treatment
- 2,4-De0
- Outcome
- internode elongatione0
- Direction
- markedly increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The synthetic auxin 2,4dichlorophenoxyacetic acid (2,4-D) also markedly increased internode elongation in 1kb plants”
e1“garden pea (Pisum sativum L.)”
Claim · model-written summary
2,4-D nearly restored petiole length to wild type in 1kb plants.
- Taxon
- garden pea (Pisum sativum L.)Lathyrus oleraceuse1
- Material
- 1kbe0
- Treatment
- 2,4-De0
- Outcome
- petiolese0
- Direction
- virtually restorede0
- Comparator
- wild-typee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“2,4-D) also markedly increased internode elongation in 1kb plants and virtually restored petioles and tendrils to their wild-type length”
e1“garden pea (Pisum sativum L.)”
Claim · model-written summary
2,4-D nearly restored tendril length to wild type in 1kb plants.
- Taxon
- garden pea (Pisum sativum L.)Lathyrus oleraceuse1
- Material
- 1kbe0
- Treatment
- 2,4-De0
- Outcome
- tendrilse0
- Direction
- virtually restorede0
- Comparator
- wild-typee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“2,4-D) also markedly increased internode elongation in 1kb plants and virtually restored petioles and tendrils to their wild-type length”
e1“garden pea (Pisum sativum L.)”
Claim · model-written summary
TIBA caused little or no elongation increase above application in wild type.
- Taxon
- garden pea (Pisum sativum L.)Lathyrus oleraceuse1
- Material
- wildtypee0
- Treatment
- TIBAe0
- Outcome
- elongatione0
- Direction
- little or no increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“treatment of wildtype plants with TIBA, HFCA, or 2,4-D caused little or no increase in elongation above the application site”
e1“garden pea (Pisum sativum L.)”
Claim · model-written summary
HFCA caused little or no elongation increase above application in wild type.
- Taxon
- garden pea (Pisum sativum L.)Lathyrus oleraceuse1
- Material
- wildtypee0
- Treatment
- HFCAe0
- Outcome
- elongatione0
- Direction
- little or no increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“treatment of wildtype plants with TIBA, HFCA, or 2,4-D caused little or no increase in elongation above the application site”
e1“garden pea (Pisum sativum L.)”
Claim · model-written summary
2,4-D caused little or no elongation increase above application in wild type.
- Taxon
- garden pea (Pisum sativum L.)Lathyrus oleraceuse1
- Material
- wildtypee0
- Treatment
- 2,4-De0
- Outcome
- elongatione0
- Direction
- little or no increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“treatment of wildtype plants with TIBA, HFCA, or 2,4-D caused little or no increase in elongation above the application site”
e1“garden pea (Pisum sativum L.)”
Claim · model-written summary
Aminoethoxyvinylglycine increased stem elongation in 1kb plants.
- Taxon
- garden pea (Pisum sativum L.)Lathyrus oleraceuse1
- Material
- 1kbe0
- Treatment
- aminoethoxyvinylglycinee0
- Outcome
- stem elongatione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“aminoethoxyvinylglycine also increased stem elongation in 1kb plants”
e1“garden pea (Pisum sativum L.)”
Claim · model-written summary
Combined HFCA and aminoethoxyvinylglycine restored 1kb internodes to wild-type length.
- Taxon
- garden pea (Pisum sativum L.)Lathyrus oleraceuse1
- Material
- 1kbe0
- Treatment
- combined application of HFCA and aminoethoxyvinylglycinee0
- Outcome
- internodese0
- Direction
- restorede0
- Comparator
- wild-typee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“combined application of HFCA and aminoethoxyvinylglycine restored 1kb internodes to the wild-type length”
e1“garden pea (Pisum sativum L.)”
Claim · model-written summary
Authors conclude wild-type internode IAA is needed for normal elongation.
- Taxon
- garden pea (Pisum sativum L.)Lathyrus oleraceuse1
- Organ / stage
- internodese0
- Compound
- IAAe0
- Outcome
- normal elongatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the level of IAA in wild-type internodes is necessary for normal elongation”
e1“garden pea (Pisum sativum L.)”
Claim · model-written summary
Authors attribute reduced 1kb stature partly to reduced free IAA.
- Taxon
- garden pea (Pisum sativum L.)Lathyrus oleraceuse1
- Material
- 1kbe0
- Compound
- free IAAe0
- Outcome
- reduced staturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the reduced stature of 1kb plants is at least partially attributable to a reduction in free IAA level in this mutant”
e1“garden pea (Pisum sativum L.)”
The same questions in other papers
2,4-D · growth · Lathyrus oleraceus (pea)Results differ
6 papers in the same direction as this paper · 7 in the opposite direction
- negative
- negative
- negative
10 papers more in this group
See all 14 papers →2,3,5-triiodobenzoic acid · physiology: hormones · Lathyrus oleraceus (pea)Positive and negative results
1 in the opposite direction
- negative
2,3,5-triiodobenzoic acid · growth · Lathyrus oleraceus (pea)Positive and negative results
3 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- negative
- positive
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.