Abstract
The production of additional floral organs by the inflorescence of Helianthus annuus as a boron deficiency symptom was examined and found to be related to the occurrence of minute splits in the receptacle of the young capitulum. Wounding the receptacle by puncturing or cutting at an early stage when the receptacle dome was forming (floral stage 3) or later when the receptacle had either become saucer-shaped (floral stage 4) or the first rows of disc floret primordia were appearing on the rim of the receptacle (floral stage 5) resulted in the initiation of involucral bracts, ray and disc florets in the wound area, reproducing the symptoms of boron deficiency. When the receptacle was wounded at later floral stages, when the receptacle was partially or wholly covered by disc floret primordia, involucral bracts and ray florets were not formed in the proximity of the wound, leading to the conclusion that the commitment of floral organ primordia begins at the time of their initiation. The inductive effects of wounding could not be reproduced by indoleacetic acid, naphthaleneacetic acid or benzyladenine applied to the receptacle surface in lanoline paste. The results are related to the normal development of the sunflower inflorescence and it is concluded that the first floral organ primordia that appear in floral stage 3 and develop into involucral bracts during floral stage 4 may determine the positions of subsequent primordia and establish the radial symmetry of the inflorescence.
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Claims 8
Claim · model-written summary
Additional floral organs associated with boron deficiency were related to minute splits in the young sunflower receptacle.
- Taxon
- Helianthus annuus
Helianthus annuuse0 - Organ / stage
- receptacle of the young capitulume0
- Outcome
- production of additional floral organse0
- Qualifier
- minute splitse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The production of additional floral organs by the inflorescence of Helianthus annuus as a boron deficiency symptom was examined and found to be related to the occurrence of minute splits in the receptacle of the young capitulum.”
Claim · model-written summary
Wounding the receptacle at floral stages 3–5 initiated involucral bracts, ray florets and disc florets in the wound area.
- Taxon
- Helianthus annuusHelianthus annuuse1
- Organ / stage
- floral stage 3e0
- Treatment
- Wounding the receptacle by puncturing or cuttinge0
- Outcome
- initiation of involucral bracts, ray and disc florets in the wound areae0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Wounding the receptacle by puncturing or cutting at an early stage when the receptacle dome was forming (floral stage 3) or later when the receptacle had either become saucer-shaped (floral stage 4) or the first rows of disc floret primordia were appearing on the rim of the receptacle (floral stage 5) resulted in the initiation of involucral bracts, ray and disc florets in the wound area”
e1“Helianthus annuus”
Claim · model-written summary
Later-stage receptacle wounding did not initiate involucral bracts or ray florets near the wound.
- Taxon
- Helianthus annuusHelianthus annuuse1
- Organ / stage
- receptaclee0
- Treatment
- receptacle was wounded at later floral stagese0
- Outcome
- involucral bracts and ray florets were not formed in the proximity of the wounde0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the receptacle was wounded at later floral stages, when the receptacle was partially or wholly covered by disc floret primordia, involucral bracts and ray florets were not formed in the proximity of the wound”
e1“Helianthus annuus”
Claim · model-written summary
Indoleacetic acid did not reproduce the inductive effect of wounding.
- Taxon
- Helianthus annuusHelianthus annuuse1
- Treatment
- indoleacetic acide0
- Outcome
- inductive effectse0
- Direction
- could not be reproducede0
- Comparator
- woundinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The inductive effects of wounding could not be reproduced by indoleacetic acid, naphthaleneacetic acid or benzyladenine applied to the receptacle surface in lanoline paste.”
e1“Helianthus annuus”
Claim · model-written summary
Naphthaleneacetic acid did not reproduce the inductive effect of wounding.
- Taxon
- Helianthus annuusHelianthus annuuse1
- Treatment
- naphthaleneacetic acide0
- Outcome
- inductive effectse0
- Direction
- could not be reproducede0
- Comparator
- woundinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The inductive effects of wounding could not be reproduced by indoleacetic acid, naphthaleneacetic acid or benzyladenine applied to the receptacle surface in lanoline paste.”
e1“Helianthus annuus”
Claim · model-written summary
Benzyladenine did not reproduce the inductive effect of wounding.
- Taxon
- Helianthus annuusHelianthus annuuse1
- Treatment
- benzyladeninee0
- Outcome
- inductive effectse0
- Direction
- could not be reproducede0
- Comparator
- woundinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The inductive effects of wounding could not be reproduced by indoleacetic acid, naphthaleneacetic acid or benzyladenine applied to the receptacle surface in lanoline paste.”
e1“Helianthus annuus”
Claim · model-written summary
The authors concluded that floral organ primordia become committed when initiated.
- Taxon
- Helianthus annuusHelianthus annuuse1
- Organ / stage
- floral organ primordiae0
- Outcome
- commitment of floral organ primordia begins at the time of their initiatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the commitment of floral organ primordia begins at the time of their initiation”
e1“Helianthus annuus”
Claim · model-written summary
The first floral organ primordia may position subsequent primordia and establish inflorescence radial symmetry.
- Taxon
- Helianthus annuusHelianthus annuuse1
- Organ / stage
- first floral organ primordiae0
- Outcome
- radial symmetry of the inflorescencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the first floral organ primordia that appear in floral stage 3 and develop into involucral bracts during floral stage 4 may determine the positions of subsequent primordia and establish the radial symmetry of the inflorescence”
e1“Helianthus annuus”
The same questions in other papers
mechanical · molecular: metabolites · Helianthus annuus (common sunflower)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- negative
- positive
pruning · molecular: metabolites · Helianthus annuus (common sunflower)Positive and negative results
2 papers in the same direction as this paper · 2 in the opposite direction
- negative
- negative
- positive
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.