Abstract
Abstract Poor yields of sucrose from sugarcane are often associated with low sucrose:cane ratios, particularly when climatic conditions tend to favor stem elongation rather than sucrose accumulation. Plant growth regulators may be used to modify environmental effects on the growth of sugarcane and thus alter the balance between utilization and storage of sucrose. The objectives of this study were to investigate the influence of temperature, soil moisture, and the coadministration of plant growth retardants on the response of sugarcane to treatment with gibberellic acid. Single foliar applications of GA (gibberellic acid) commercial sugarcane varieties (interspecific hybrids of Saccharum ) stimulated stem elongation for from 2 to 6 weeks, but this response was not reflected in higher cane yields unless the plants were harvested within 6 weeks of treatment. A second application of GA at 4 weeks prolonged the growth response. In the field low temperatures were associated with the more prolonged growth responses, which were of smaller amplitude. Moisture stress had no apparent effect on GA response. No correlations were evident between environmental conditions or application rates and the duration of growth responses in greenhouse trials, but the amplitude increased with application rate within the range of 25 to 200 ppm. Three to five immature or semimature internodes were affected. In field trials under warm conditions a period of growth retardation followed the initial GA‐induced growth stimulation. This did not occur in greenhouse trials. Stem‐sugar concentrations fell during the growthstimulation phase, but recovered as growth rates reduced. Attempts were made to accentuate this recovery, and so to increase the accumulation of sugars, by coadministration of growth retardants with GA. Dalapon had a delayed effect on cane growth, slightly curtailing the duration of the GA response, and suppressing growth thereafter. The phase of growth suppression was accompanied by increased stem sugar concentration in greenhouse‐, but not in field‐trials. Sodium silicate (at up to 200 ppm) had no significant effect on growth or sugar accumulation and did not modify the response to GA. Treatment with azauracil (at up to 400 ppm) strongly inhibited cane growth and increased stem‐sugar concentrations, but showed no significant interaction with GA.
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Claims 20
Claim · model-written summary
Single foliar gibberellic acid applications stimulated sugarcane stem elongation for 2 to 6 weeks.
- Taxon
- Sugarcanet0
- Treatment
- Single foliar applications of GA (gibberellic acid)e0
- Outcome
- stem elongatione1
- Direction
- stimulatede1
- Value
- 2 to 6 weekse1
Not reportedComparator
Verbatim
t0“Response of Sugarcane to Foliar Treatment with Gibberellin”
e0“Single foliar applications of GA (gibberellic acid)”
e1“stimulated stem elongation for from 2 to 6 weeks”
Claim · model-written summary
The gibberellin response was not reflected in higher cane yields unless plants were harvested within 6 weeks of treatment.
- Taxon
- Sugarcanet0
- Treatment
- Single foliar applications of GA (gibberellic acid)e0
- Outcome
- higher cane yieldse1
- Direction
- not reflected ine1
- Qualifier
- unless the plants were harvested within 6 weeks of treatmente1
Not reportedComparator
Verbatim
t0“Response of Sugarcane to Foliar Treatment with Gibberellin”
e0“Single foliar applications of GA (gibberellic acid)”
e1“but this response was not reflected in higher cane yields unless the plants were harvested within 6 weeks of treatment”
Claim · model-written summary
A second gibberellin application at 4 weeks prolonged the sugarcane growth response.
- Taxon
- Sugarcanet0
- Treatment
- A second application of GA at 4 weekse0
- Outcome
- growth responsee0
- Direction
- prolongede0
Not reportedComparator
Verbatim
t0“Response of Sugarcane to Foliar Treatment with Gibberellin”
e0“A second application of GA at 4 weeks prolonged the growth response”
Claim · model-written summary
In the field, low temperatures were associated with more prolonged sugarcane growth responses.
Verbatim
t0“Response of Sugarcane to Foliar Treatment with Gibberellin”
e0“In the field low temperatures were associated with the more prolonged growth responses, which were of smaller amplitude”
Claim · model-written summary
In the field, low temperatures were associated with smaller amplitude of sugarcane growth responses.
Verbatim
t0“Response of Sugarcane to Foliar Treatment with Gibberellin”
e0“In the field low temperatures were associated with the more prolonged growth responses, which were of smaller amplitude”
Claim · model-written summary
Moisture stress had no apparent effect on the sugarcane gibberellin response.
Not reportedComparator
Verbatim
t0“Response of Sugarcane to Foliar Treatment with Gibberellin”
e0“Moisture stress had no apparent effect on GA response”
Claim · model-written summary
In greenhouse trials, environmental conditions and application rates showed no correlation with the duration of growth responses.
Verbatim
t0“Response of Sugarcane to Foliar Treatment with Gibberellin”
e0“No correlations were evident between environmental conditions or application rates and the duration of growth responses in greenhouse trials”
Claim · model-written summary
In greenhouse trials, the amplitude of sugarcane growth responses increased with application rate within 25 to 200 ppm.
Verbatim
t0“Response of Sugarcane to Foliar Treatment with Gibberellin”
e0“but the amplitude increased with application rate within the range of 25 to 200 ppm”
e1“No correlations were evident between environmental conditions or application rates and the duration of growth responses in greenhouse trials”
Claim · model-written summary
Three to five immature or semimature internodes of sugarcane were affected.
Verbatim
t0“Response of Sugarcane to Foliar Treatment with Gibberellin”
e0“Three to five immature or semimature internodes were affected”
Claim · model-written summary
In field trials under warm conditions, a period of sugarcane growth retardation followed the initial gibberellin-induced stimulation, which did not occur in greenhouse trials.
Verbatim
t0“Response of Sugarcane to Foliar Treatment with Gibberellin”
e0“In field trials under warm conditions a period of growth retardation followed”
e1“This did not occur in greenhouse trials”
Claim · model-written summary
Stem sugar concentrations of sugarcane fell during the growth-stimulation phase.
Verbatim
t0“Response of Sugarcane to Foliar Treatment with Gibberellin”
e0“sugar concentrations fell during the growthstimulation phase”
Claim · model-written summary
Stem sugar concentrations of sugarcane recovered as growth rates reduced.
Verbatim
t0“Response of Sugarcane to Foliar Treatment with Gibberellin”
e0“sugar concentrations fell during the growthstimulation phase”
e1“but recovered as growth rates reduced”
Claim · model-written summary
Dalapon slightly curtailed the duration of the sugarcane gibberellin response.
- Taxon
- Sugarcanet0
- Treatment
- Dalapone0
- Outcome
- duration of the GA responsee0
- Direction
- curtailinge0
- Qualifier
- slightlye0
Not reportedComparator
Verbatim
t0“Response of Sugarcane to Foliar Treatment with Gibberellin”
e0“Dalapon had a delayed effect on cane growth, slightly curtailing the duration of the GA response, and suppressing growth thereafter”
Claim · model-written summary
Dalapon suppressed sugarcane growth after the gibberellin response.
Not reportedComparator
Verbatim
t0“Response of Sugarcane to Foliar Treatment with Gibberellin”
e0“Dalapon had a delayed effect on cane growth, slightly curtailing the duration of the GA response, and suppressing growth thereafter”
Claim · model-written summary
Dalapon increased stem sugar concentration of sugarcane in greenhouse trials but not in field trials.
- Taxon
- Sugarcanet0
- Treatment
- Dalapone0
- Outcome
- stem sugar concentratione1
- Direction
- increasede1
- Qualifier
- but not in fielde2
- Setting
- greenhousee1
Not reportedComparator
Verbatim
t0“Response of Sugarcane to Foliar Treatment with Gibberellin”
e0“Dalapon had a delayed effect on cane growth, slightly curtailing the duration of the GA response, and suppressing growth thereafter”
e1“accompanied by increased stem sugar concentration in greenhouse”
e2“but not in field”
Claim · model-written summary
Sodium silicate had no significant effect on sugarcane growth or sugar accumulation.
- Taxon
- Sugarcanet0
- Treatment
- Sodium silicatee0
- Outcome
- growth or sugar accumulatione0
- Direction
- no significant effecte0
- Value
- up to 200 ppme0
Not reportedComparator
Verbatim
t0“Response of Sugarcane to Foliar Treatment with Gibberellin”
e0“Sodium silicate (at up to 200 ppm) had no significant effect on growth or sugar accumulation and did not modify the response to GA”
Claim · model-written summary
Sodium silicate did not modify the sugarcane response to gibberellin.
- Taxon
- Sugarcanet0
- Treatment
- Sodium silicatee0
- Outcome
- response to GAe0
- Direction
- did not modifye0
- Value
- up to 200 ppme0
Not reportedComparator
Verbatim
t0“Response of Sugarcane to Foliar Treatment with Gibberellin”
e0“Sodium silicate (at up to 200 ppm) had no significant effect on growth or sugar accumulation and did not modify the response to GA”
Claim · model-written summary
Azauracil strongly inhibited sugarcane cane growth.
- Taxon
- Sugarcanet0
- Treatment
- azauracile0
- Outcome
- cane growthe0
- Direction
- strongly inhibitede0
- Value
- up to 400 ppme0
Not reportedComparator
Verbatim
t0“Response of Sugarcane to Foliar Treatment with Gibberellin”
e0“Treatment with azauracil (at up to 400 ppm) strongly inhibited cane growth”
Claim · model-written summary
Azauracil increased stem sugar concentrations of sugarcane.
- Taxon
- Sugarcanet0
- Treatment
- azauracile0
- Outcome
- stem‐sugar concentrationse1
- Direction
- increasede1
- Value
- up to 400 ppme0
Not reportedComparator
Verbatim
t0“Response of Sugarcane to Foliar Treatment with Gibberellin”
e0“Treatment with azauracil (at up to 400 ppm)”
e1“increased stem‐sugar concentrations”
Claim · model-written summary
Azauracil showed no significant interaction with gibberellin in sugarcane.
- Taxon
- Sugarcanet0
- Treatment
- azauracile0
- Outcome
- interaction with GAe1
- Direction
- no significant interactione1
Not reportedComparator
Verbatim
t0“Response of Sugarcane to Foliar Treatment with Gibberellin”
e0“Treatment with azauracil (at up to 400 ppm)”
e1“but showed no significant interaction with GA”
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