Abstract
The role of the apical shoot as a source of inhibitors preventing fruit growth in the absence of a stimulus (e.g. pollination or application of gibberellic acid) has been investigated in pea (Pisum sativum L.). Plant decapitation stimulated parthenocarpic growth, even in derooted plants, and this effect was counteracted by the application of indole acetic acid (IAA) or abscisic acid (ABA) in agar blocks to the severed stump. The treatment of unpollinated ovaries with gibberellic acid blocked the effect of IAA or ABA applied to the stump. [3H]IAA and [3H]ABA applied to the stump were transported basipetally, and [3H]ABA but not [3H]IAA was also detected in unpollinated ovaries. The concentration of ABA in unpollinated ovaries increased significantly in the absence of a promotive stimulus. The application of IAA to the stump enhanced by 2- to 5-fold the concentration of ABA in the inhibited ovary, whereas the inhibition of IAA transport from the apical shoot by triiodobenzoic acid decreased the ovary content of ABA (to approximately one-half). Triiodobenzoic acid alone, however, was unable to stimulate ovary growth. Thus, in addition to removing IAA transport from the apical shoot, the accumulation of a promotive factor is also necessary to induce parthenocarpic growth in decapitated plants.
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Claims 11
Claim · model-written summary
Decapitation stimulated parthenocarpic growth even without roots.
- Taxon
- pea
Lathyrus oleraceust0 - Treatment
- Plant decapitatione0
- Outcome
- parthenocarpic growthe0
- Direction
- stimulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant decapitation stimulated parthenocarpic growth, even in derooted plants”
t0“Pea”
Claim · model-written summary
IAA applied to the severed stump counteracted decapitation-induced growth.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- indole acetic acid (IAA)e0
- Outcome
- this effecte0
- Direction
- counteractede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this effect was counteracted by the application of indole acetic acid (IAA) or abscisic acid (ABA) in agar blocks to the severed stump”
t0“Pea”
Claim · model-written summary
ABA applied to the stump counteracted decapitation-induced growth.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- abscisic acid (ABA)e0
- Outcome
- this effecte0
- Direction
- counteractede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this effect was counteracted by the application of indole acetic acid (IAA) or abscisic acid (ABA) in agar blocks to the severed stump”
t0“Pea”
Claim · model-written summary
Gibberellic acid on unpollinated ovaries blocked the inhibitory effect of stump-applied IAA or ABA.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- gibberellic acide0
- Outcome
- effect of IAA or ABAe0
- Direction
- blockede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The treatment of unpollinated ovaries with gibberellic acid blocked the effect of IAA or ABA applied to the stump”
t0“Pea”
Claim · model-written summary
Radiolabeled IAA and ABA moved basipetally from the stump.
- Taxon
- peaLathyrus oleraceust0
- Outcome
- transported basipetallye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“[3H]IAA and [3H]ABA applied to the stump were transported basipetally”
t0“Pea”
Claim · model-written summary
Radiolabeled ABA, but not IAA, was detected in unpollinated ovaries.
- Taxon
- peaLathyrus oleraceust0
- Outcome
- detected in unpollinated ovariese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“[3H]ABA but not [3H]IAA was also detected in unpollinated ovaries”
t0“Pea”
Claim · model-written summary
Ovarian ABA concentration rose significantly without a promotive stimulus.
- Taxon
- peaLathyrus oleraceust0
- Outcome
- concentration of ABA in unpollinated ovariese0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The concentration of ABA in unpollinated ovaries increased significantly in the absence of a promotive stimulus”
t0“Pea”
Claim · model-written summary
Stump-applied IAA increased ABA concentration in inhibited ovaries two to fivefold.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- application of IAA to the stumpe0
- Outcome
- concentration of ABA in the inhibited ovarye0
- Direction
- enhancede0
- Value
- 2- to 5-folde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of IAA to the stump enhanced by 2- to 5-fold the concentration of ABA in the inhibited ovary”
t0“Pea”
Claim · model-written summary
Blocking IAA transport with triiodobenzoic acid halved ovarian ABA content.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- triiodobenzoic acide0
- Outcome
- ovary content of ABAe0
- Direction
- decreasede0
- Value
- approximately one-halfe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the inhibition of IAA transport from the apical shoot by triiodobenzoic acid decreased the ovary content of ABA (to approximately one-half)”
t0“Pea”
Claim · model-written summary
Triiodobenzoic acid alone did not stimulate ovary growth.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- Triiodobenzoic acid alonee0
- Outcome
- ovary growthe0
- Direction
- unable to stimulatee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Triiodobenzoic acid alone, however, was unable to stimulate ovary growth”
t0“Pea”
Claim · model-written summary
Inducing parthenocarpic growth after decapitation also requires accumulation of a promotive factor.
- Taxon
- PeaLathyrus oleraceust0
- Outcome
- parthenocarpic growthe0
- Qualifier
- accumulation of a promotive factore0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the accumulation of a promotive factor is also necessary to induce parthenocarpic growth in decapitated plants”
t0“Pea”
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See all 13 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.