Abstract
A series of greenhouse experiments was conducted with `Shamrock' bell pepper (Capsicum annuum L.) to gain insight into the flower abscission mechanism and to investigate methods to reduce reproductive structure abscission due to low light intensity. Foliar sprays of STS reduced stress-induced abscission. Application of the synthetic auxin NAA to the ovary substituted for pollination to effect fruit set under nonstress conditions, but did not improve fruit set compared to pollinated controls under low-light stress. Ovary treatment with GA 3 and BA either alone or combined with NAA had similar results to NAA treatment alone. Foliar sprays of NAA or CPA also did not improve fruit set under low-light stress conditions. Application of NAA in an aqueous paste to the abscission zone prevented abscission but inhibited fruit growth. Taken together, the results indicate that stress-induced abscission is not prevented by auxin application to the ovary or foliage. The interaction of ethylene and auxin in reproductive structure abscission under stress conditions requires further investigation. Chemical names used: 6-benzylaminopurine (BA), p-chlorophenoxy acetic acid (CPA), gibberellic acid (GA,), silver thiosulfate (STS).
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Claims 8
Claim · model-written summary
Foliar STS reduced stress-induced abscission.
- Taxon
- bell peppert0
- Treatment
- Foliar sprays of STSe0
- Outcome
- stress-induced abscissione0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“Foliar sprays of STS reduced stress-induced abscission.”
t0“bell pepper (Capsicum annuum L.)”
Claim · model-written summary
Ovary NAA substituted for pollination to induce fruit set without stress.
- Taxon
- bell peppert0
- Treatment
- NAA to the ovarye0
- Outcome
- fruit sete0
- Qualifier
- nonstress conditionse0
- Comparator
- pollinatione0
Not reportedDirection
Verbatim
e0“Application of the synthetic auxin NAA to the ovary substituted for pollination to effect fruit set under nonstress conditions”
t0“bell pepper (Capsicum annuum L.)”
Claim · model-written summary
Ovary NAA did not improve fruit set over pollinated controls under low light.
Verbatim
e0“did not improve fruit set compared to pollinated controls under low-light stress”
e1“Application of the synthetic auxin NAA to the ovary”
t0“bell pepper (Capsicum annuum L.)”
Claim · model-written summary
Ovary GA 3 and BA, alone or with NAA, gave similar results to NAA alone.
- Taxon
- bell peppert0
- Treatment
- GA 3 and BA either alone or combined with NAAe0
- Outcome
- similar resultse0
- Comparator
- NAA treatment alonee0
Not reportedDirection
Verbatim
e0“Ovary treatment with GA 3 and BA either alone or combined with NAA had similar results to NAA treatment alone.”
t0“bell pepper (Capsicum annuum L.)”
Claim · model-written summary
Foliar NAA did not improve fruit set under low light.
Not reportedComparator
Verbatim
e0“Foliar sprays of NAA or CPA also did not improve fruit set under low-light stress conditions.”
t0“bell pepper (Capsicum annuum L.)”
Claim · model-written summary
Foliar CPA did not improve fruit set under low light.
Not reportedComparator
Verbatim
e0“Foliar sprays of NAA or CPA also did not improve fruit set under low-light stress conditions.”
t0“bell pepper (Capsicum annuum L.)”
Claim · model-written summary
NAA paste at the abscission zone prevented abscission.
- Taxon
- bell peppert0
- Treatment
- NAA in an aqueous paste to the abscission zonee0
- Outcome
- abscissione0
- Direction
- preventede0
Not reportedComparator
Verbatim
e0“Application of NAA in an aqueous paste to the abscission zone prevented abscission but inhibited fruit growth.”
t0“bell pepper (Capsicum annuum L.)”
Claim · model-written summary
NAA paste at the abscission zone inhibited fruit growth.
- Taxon
- bell peppert0
- Treatment
- NAA in an aqueous paste to the abscission zonee0
- Outcome
- fruit growthe0
- Direction
- inhibitede0
Not reportedComparator
Verbatim
e0“Application of NAA in an aqueous paste to the abscission zone prevented abscission but inhibited fruit growth.”
t0“bell pepper (Capsicum annuum L.)”
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