Abstract
Decapitated segments from maize (Zea mays L.) coleoptiles oriented vertically in an upright position show a strong spontaneous growth response (SGR) 3 h after decapitation. The latent period of the SGR is markedly reduced when these segments are oriented in an inverted position. Coleoptile segments with intact tips exhibit a weak and transient SGR in the vertical upright orientation. However, in the inverted orientation, these segments show a typical SGR. The data are inconsistent with the current hypothesis that the SGR is caused by a time-dependent increase in tissue sensitivity to auxin. The parallel increase in membrane potential difference and growth rate during the time-course of the SGR indicates a possible role for PM H + -ATPase in the establishment of the SGR in maize coleoptile segments.
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Claims 6
Claim · model-written summary
Upright decapitated maize coleoptile segments show strong spontaneous growth three hours after decapitation.
- Organ / stage
- coleoptilese0
- Outcome
- strong spontaneous growth response (SGR)e0
- Direction
- stronge0
- Value
- 3 he0
- Setting
- upright positione0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Decapitated segments from maize (Zea mays L.) coleoptiles oriented vertically in an upright position show a strong spontaneous growth response (SGR) 3 h after decapitation”
Claim · model-written summary
Inverting decapitated segments markedly reduces the latent period of spontaneous growth.
- Organ / stage
- coleoptilese1
- Treatment
- inverted positione0
- Outcome
- latent period of the SGRe0
- Direction
- reducede0
- Comparator
- upright positione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The latent period of the SGR is markedly reduced when these segments are oriented in an inverted position”
e1“Decapitated segments from maize (Zea mays L.) coleoptiles oriented vertically in an upright position”
Claim · model-written summary
Intact-tip coleoptile segments show a weak transient spontaneous growth response when upright.
- Organ / stage
- Coleoptile segments with intact tipse0
- Outcome
- weak and transient SGRe0
- Setting
- vertical upright orientatione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Coleoptile segments with intact tips exhibit a weak and transient SGR in the vertical upright orientation”
e1“maize (Zea mays L.)”
Claim · model-written summary
Intact-tip coleoptile segments show a typical spontaneous growth response when inverted.
- Organ / stage
- Coleoptile segments with intact tipse1
- Treatment
- inverted orientatione0
- Outcome
- typical SGRe0
- Comparator
- vertical upright orientatione1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the inverted orientation, these segments show a typical SGR”
e1“Coleoptile segments with intact tips exhibit a weak and transient SGR in the vertical upright orientation”
e2“maize (Zea mays L.)”
Claim · model-written summary
The observations are inconsistent with the proposed time-dependent increase in auxin sensitivity causing spontaneous growth.
- Outcome
- inconsistent with the current hypothesise0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The data are inconsistent with the current hypothesis that the SGR is caused by a time-dependent increase in tissue sensitivity to auxin”
e1“maize (Zea mays L.)”
Claim · model-written summary
Membrane potential difference and growth rate rise in parallel during spontaneous growth, suggesting a possible PM H + -ATPase role.
- Organ / stage
- coleoptile segmentse0
- Gene
- PM H + -ATPasee0
- Outcome
- membrane potential difference and growth ratee0
- Direction
- increasee0
- Qualifier
- possible rolee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The parallel increase in membrane potential difference and growth rate during the time-course of the SGR indicates a possible role for PM H + -ATPase in the establishment of the SGR in maize coleoptile segments”