Abstract
Growth response of coleoptile segments excised from 3-day-old seedlings of wheat (Triticum vulgare cv. Baart) to gibberellic acid, indoleacetic acid, and 2,4-dichlorophenoxyacetic acid, to red light, and to several microtubule disorganizers depends on the initial position of the excised segment in the intact coleoptile. Red light, 660 nm, stimulates the growth of the apical cells, but inhibits markedly the growth of the cells in the basal region of the coleoptile. The effects of red light are independent of sucrose, gibberellic acid, indoleacetic acid, and 2,4-dichlorophenoxyacetic acid, even though these substances themselves markedly affect the growth of the coleoptile segments. Concentractions of the microtubule disorganizers, vinblastine sulfate, cupric chloride, urea, and colchicine, which do not alter significantly the growth of the dark control apical segments, substantially repress the promotive effects of red light or auxin on the increase in length of the apical cells of the coleoptile. This suggests that stimulation by red light and by auxin involves microtubule production. Microtubule disorganizers repress the growth of elongating cells of the coleoptile, yet on the other hand, auxin and irradiation do not alter significantly the response of basal cells to the microtubule disorganizing agents. We hypothesized that light and growth regulators induce polymerization of nonaggregated microtubule subunits, resulting in faster growth.
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Claims 11
Claim · model-written summary
Response of wheat coleoptile segments to hormones, red light and microtubule disorganizers depends on original segment position.
- Taxon
- wheat
Triticum aestivume0 - Material
- Triticum vulgare cv. Baarte0
- Organ / stage
- coleoptile segmentse0
- Outcome
- Growth responsee0
- Qualifier
- initial position of the excised segmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth response of coleoptile segments excised from 3-day-old seedlings of wheat (Triticum vulgare cv. Baart) to gibberellic acid, indoleacetic acid, and 2,4-dichlorophenoxyacetic acid, to red light, and to several microtubule disorganizers depends on the initial position of the excised segment in the intact coleoptile.”
Claim · model-written summary
Red light stimulates growth of apical wheat coleoptile cells.
- Taxon
- WheatTriticum aestivumt0
- Organ / stage
- apical cellse0
- Treatment
- Red light, 660 nme0
- Outcome
- growth of the apical cellse0
- Direction
- stimulatese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Red light, 660 nm, stimulates the growth of the apical cells”
t0“Wheat Coleoptile Segment Growth”
Claim · model-written summary
Red light markedly inhibits growth of basal wheat coleoptile cells.
- Taxon
- WheatTriticum aestivumt0
- Organ / stage
- basal region of the coleoptilee0
- Treatment
- Red light, 660 nme0
- Outcome
- growth of the cells in the basal region of the coleoptilee0
- Direction
- inhibitse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Red light, 660 nm, stimulates the growth of the apical cells, but inhibits markedly the growth of the cells in the basal region of the coleoptile.”
t0“Wheat Coleoptile Segment Growth”
Claim · model-written summary
Red light effects on wheat coleoptile growth are independent of sucrose and three hormones.
- Taxon
- WheatTriticum aestivumt0
- Outcome
- effects of red lighte0
- Qualifier
- independent of sucrose, gibberellic acid, indoleacetic acid, and 2,4-dichlorophenoxyacetic acide0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of red light are independent of sucrose, gibberellic acid, indoleacetic acid, and 2,4-dichlorophenoxyacetic acid”
t0“Wheat Coleoptile Segment Growth”
Claim · model-written summary
Sucrose and the three hormones markedly affect wheat coleoptile segment growth.
- Taxon
- WheatTriticum aestivumt0
- Outcome
- growth of the coleoptile segmentse0
- Qualifier
- these substancese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“these substances themselves markedly affect the growth of the coleoptile segments”
t0“Wheat Coleoptile Segment Growth”
Claim · model-written summary
Microtubule disorganizers substantially repress red-light-promoted elongation of apical wheat coleoptile cells at concentrations without significant dark-control growth effects.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- microtubule disorganizers, vinblastine sulfate, cupric chloride, urea, and colchicinee0
- Outcome
- increase in length of the apical cells of the coleoptilee0
- Direction
- represse0
- Comparator
- dark control apical segmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Concentractions of the microtubule disorganizers, vinblastine sulfate, cupric chloride, urea, and colchicine, which do not alter significantly the growth of the dark control apical segments, substantially repress the promotive effects of red light or auxin on the increase in length of the apical cells of the coleoptile.”
t0“Wheat Coleoptile Segment Growth”
Claim · model-written summary
Microtubule disorganizers substantially repress auxin-promoted elongation of apical wheat coleoptile cells.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- microtubule disorganizers, vinblastine sulfate, cupric chloride, urea, and colchicinee0
- Outcome
- increase in length of the apical cells of the coleoptilee0
- Direction
- represse0
- Comparator
- dark control apical segmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Concentractions of the microtubule disorganizers, vinblastine sulfate, cupric chloride, urea, and colchicine, which do not alter significantly the growth of the dark control apical segments, substantially repress the promotive effects of red light or auxin on the increase in length of the apical cells of the coleoptile.”
t0“Wheat Coleoptile Segment Growth”
Claim · model-written summary
Microtubule disorganizers repress growth of elongating wheat coleoptile cells.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- Microtubule disorganizerse0
- Outcome
- growth of elongating cells of the coleoptilee0
- Direction
- represse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Microtubule disorganizers repress the growth of elongating cells of the coleoptile”
t0“Wheat Coleoptile Segment Growth”
Claim · model-written summary
Auxin and irradiation do not significantly alter the basal cell response to microtubule disorganizers.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- auxin and irradiatione0
- Outcome
- response of basal cells to the microtubule disorganizing agentse0
- Direction
- do not altere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“auxin and irradiation do not alter significantly the response of basal cells to the microtubule disorganizing agents”
t0“Wheat Coleoptile Segment Growth”
Claim · model-written summary
The authors suggest that red light and auxin stimulation involves microtubule production.
- Taxon
- WheatTriticum aestivumt0
- Outcome
- stimulation by red light and by auxine0
- Qualifier
- microtubule productione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This suggests that stimulation by red light and by auxin involves microtubule production.”
t0“Wheat Coleoptile Segment Growth”
Claim · model-written summary
The authors hypothesize light and growth regulators induce polymerization of microtubule subunits, resulting in faster growth.
- Taxon
- WheatTriticum aestivumt0
- Outcome
- faster growthe0
- Qualifier
- polymerization of nonaggregated microtubule subunitse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We hypothesized that light and growth regulators induce polymerization of nonaggregated microtubule subunits, resulting in faster growth.”
t0“Wheat Coleoptile Segment Growth”
The same questions in other papers
light · growth · Triticum aestivum (wheat)Positive and negative results
45 papers in the same direction as this paper · 36 in the opposite direction · 3 reporting no difference from an alternative
- no effect
- no effect
- no effect
81 papers more in this group
See all 85 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.