Abstract
It was previously shown that removal of the ovary, which occupies the distal millimetre, caused cessation of growth of the gynophore and its intercalary meristem, suggesting that the ovary was a source of growth-promoting substances. Control of growth was studied in the gynophore of the peanut Arachis hypogaea L., cv. Bukene No. 2. Low concentrations of indoleacetic acid promoted growth of decapitated gynophores, whereas high levels inhibited elongation. Gibberellic acid promoted growth of the decapitated gynophores, whereas kinetin inhibited growth at all concentrations used. A combination of indoleacetic acid and gibberellic acid promoted extension growth of the decapitated gynophores above that of the intact gynophores; this was characterized, however, by a different pattern of cell division and cell elongation from that observed in the intact gynophores. Indoleacetic acid affected the "youngest" tissues, whereas gibberellic acid affected the whole length of the growing zone. High levels of indoleacetic acid caused diageotropism of the gynophores. Application of [ 14 C] indoleacetic acid to vertical gynophores after the ovary was excised indicated that indoleacetic acid became redistributed to one side, resulting in horizontal bending. Thus an increased amount of auxin from the enlarging ovary may be involved in placing the ovary parallel to the soil surface when it reaches a suitable depth in the soil, during normal geocarpic development. Triiodobenzoic acid reduced growth when applied in lanolin as a ring between the ovary and the meristem but not when applied proximal to the meristem, suggesting that triiodobenzoic acid prevented the transport of auxin from the ovary to the meristem.
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Claims 12
Claim · model-written summary
Low indoleacetic acid promoted growth of decapitated gynophores.
- Taxon
- peanut
Arachis hypogaeat0 - Treatment
- Low concentrations of indoleacetic acide0
- Outcome
- growth of decapitated gynophorese0
- Direction
- promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Low concentrations of indoleacetic acid promoted growth of decapitated gynophores”
t0“peanut Arachis hypogaea”
Claim · model-written summary
High indoleacetic acid inhibited elongation.
Not reportedTaxonComparator
Verbatim
e0“high levels inhibited elongation”
Claim · model-written summary
Gibberellic acid promoted decapitated gynophore growth.
Not reportedTaxonComparator
Verbatim
e0“Gibberellic acid promoted growth of the decapitated gynophores”
Claim · model-written summary
Kinetin inhibited gynophore growth at all tested concentrations.
Not reportedTaxonComparator
Verbatim
e0“kinetin inhibited growth at all concentrations used”
Claim · model-written summary
Combined indoleacetic and gibberellic acids promoted extension above intact gynophores.
- Treatment
- A combination of indoleacetic acid and gibberellic acide0
- Outcome
- extension growthe0
- Direction
- abovee0
- Comparator
- intact gynophorese0
Not reportedTaxon
Verbatim
e0“A combination of indoleacetic acid and gibberellic acid promoted extension growth of the decapitated gynophores above that of the intact gynophores”
Claim · model-written summary
The combination altered cell division and elongation patterns relative to intact gynophores.
Not reportedTaxonTreatment
Verbatim
e0“a different pattern of cell division and cell elongation from that observed in the intact gynophores”
Claim · model-written summary
Indoleacetic acid affected the youngest tissues.
Not reportedTaxon
Verbatim
e0“Indoleacetic acid affected the "youngest" tissues”
Claim · model-written summary
Gibberellic acid affected the whole growing zone.
Not reportedTaxon
Verbatim
e0“gibberellic acid affected the whole length of the growing zone”
Claim · model-written summary
High indoleacetic acid caused gynophore diageotropism.
Not reportedTaxonComparatorDirection
Verbatim
e0“High levels of indoleacetic acid caused diageotropism of the gynophores”
Claim · model-written summary
Applied labeled indoleacetic acid redistributed to one side and gynophores bent horizontally.
Not reportedTaxon
Verbatim
e0“indoleacetic acid became redistributed to one side, resulting in horizontal bending”
Claim · model-written summary
Triiodobenzoic acid reduced growth when placed between ovary and meristem.
- Treatment
- Triiodobenzoic acide0
- Outcome
- growthe0
- Direction
- reducede0
- Qualifier
- between the ovary and the meristeme0
Not reportedTaxonComparator
Verbatim
e0“Triiodobenzoic acid reduced growth when applied in lanolin as a ring between the ovary and the meristem”
Claim · model-written summary
Triiodobenzoic acid did not reduce growth when placed proximal to meristem.
Not reportedTaxonTreatmentComparatorOutcomeDirection
Verbatim
e0“but not when applied proximal to the meristem”
The same questions in other papers
indole-3-acetic acid · growth · Arachis hypogaea (peanut)Results agree
7 papers in the same direction as this paper
- positive
- positive
- positive
4 papers more in this group
See all 8 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.