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 showed strong spontaneous growth after three hours.
- Organ / stage
- coleoptilese0
- Outcome
- strong spontaneous growth responsee0
- Qualifier
- 3 h after decapitatione0
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
Inversion markedly reduced the latent period of spontaneous growth in decapitated segments.
- Treatment
- oriented in an inverted positione0
- Outcome
- latent period of the SGRe0
- Direction
- markedly reducede0
Not reportedComparator
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”
t0“maize”
Claim · model-written summary
Upright segments with intact tips had a weak transient spontaneous growth response.
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”
t0“maize”
Claim · model-written summary
Inverted segments with intact tips showed a typical spontaneous growth response.
Not reportedComparatorDirection
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”
t0“maize”
Claim · model-written summary
Parallel increases in membrane potential difference and growth rate suggested a possible role for PM H+-ATPase in spontaneous growth.
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”
Claim · model-written summary
The data contradicted a time-dependent increase in auxin sensitivity as the cause of spontaneous growth.
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”
t0“maize”