Abstract
Bioassays were adapted to investigate effects of droplet size and carrier volume on performance of daminozide, gibberellic acid (GA3) and 2,4-D using Phaseolus vulgaris L. as a model system. Response to plant growth regulators was indexed by inhibition (daminozide), promotion of internode elongation (GA3) or ethylene production (2,4-D). Elongation of first plus second internodes above primary leaves was evaluated 14 days after treatment of primary leaves, while ethylene production was determined from head-space samples of incubated leaves 24 h after treatment. Daminozide inhibition of internode elongation was related to decreased cell size and number in pith and epidermis (range 49–70% of the untreated control). GA3 increased cell size and number in both tissues 2·3- to 4·8-fold. Responsiveness to daminozide and 2,4-D markedly decreased as seedling age increased from 8 to 12 days, but responsiveness to GA3 increased. Decreasing droplet size (10–0·5 μl) and increasing carrier volume (10–200 μl per leaf) at constant dose of daminozide (100 μg per leaf) and 2,4-D (100 μg per leaf) significantly increased performance, but had little effect on performance of GA3 (2 μg per leaf). Effects of application factors on performance were related to their effects on the interface area between droplets and leaf surface. Significant positive linear relationships were obtained between plant response and the logarithm of the droplet/leaf interface area for all growth regulators. © 1998 Society of Chemical Industry
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Claims 9
Claim · model-written summary
Daminozide inhibited internode elongation and reduced pith and epidermal cell size and number to 49–70% of control.
- Taxon
- Phaseolus vulgaris L.
Phaseolus vulgarist0 - Organ / stage
- pith and epidermise0
- Treatment
- Daminozidee0
- Outcome
- cell size and number in pith and epidermise0
- Direction
- decreasede0
- Value
- 49–70%e0
- Comparator
- untreated controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Daminozide inhibition of internode elongation was related to decreased cell size and number in pith and epidermis (range 49–70% of the untreated control).”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
GA3 increased pith and epidermal cell size and number 2·3- to 4·8-fold.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Treatment
- GA3e0
- Outcome
- cell size and numbere0
- Direction
- increasede0
- Value
- 2·3- to 4·8-folde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GA3 increased cell size and number in both tissues 2·3- to 4·8-fold.”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
Responsiveness to daminozide decreased as seedling age increased from 8 to 12 days.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Treatment
- daminozidee0
- Outcome
- Responsiveness to daminozidee0
- Direction
- decreasede0
- Comparator
- 8 to 12 dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Responsiveness to daminozide and 2,4-D markedly decreased as seedling age increased from 8 to 12 days”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
Responsiveness to 2,4-D decreased as seedling age increased from 8 to 12 days.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Treatment
- 2,4-De0
- Outcome
- Responsiveness to daminozide and 2,4-De0
- Direction
- decreasede0
- Comparator
- 8 to 12 dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Responsiveness to daminozide and 2,4-D markedly decreased as seedling age increased from 8 to 12 days”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
Responsiveness to GA3 increased with seedling age.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Treatment
- GA3e0
- Outcome
- responsiveness to GA3e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but responsiveness to GA3 increased.”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
Smaller droplets and larger carrier volumes significantly increased daminozide performance.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Treatment
- daminozide (100 μg per leaf)e0
- Outcome
- performancee0
- Direction
- increasede0
- Qualifier
- Decreasing droplet size (10–0·5 μl) and increasing carrier volume (10–200 μl per leaf)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Decreasing droplet size (10–0·5 μl) and increasing carrier volume (10–200 μl per leaf) at constant dose of daminozide (100 μg per leaf) and 2,4-D (100 μg per leaf) significantly increased performance”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
Smaller droplets and larger carrier volumes significantly increased 2,4-D performance.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Treatment
- 2,4-D (100 μg per leaf)e0
- Outcome
- performancee0
- Direction
- increasede0
- Qualifier
- Decreasing droplet size (10–0·5 μl) and increasing carrier volume (10–200 μl per leaf)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Decreasing droplet size (10–0·5 μl) and increasing carrier volume (10–200 μl per leaf) at constant dose of daminozide (100 μg per leaf) and 2,4-D (100 μg per leaf) significantly increased performance”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
Spray factors had little effect on GA3 performance.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Treatment
- GA3 (2 μg per leaf)e0
- Outcome
- performance of GA3e0
- Direction
- little effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but had little effect on performance of GA3 (2 μg per leaf).”
t0“Phaseolus vulgaris L.”
Claim · model-written summary
Plant response was positively linearly related to log droplet-leaf interface area for all regulators.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Treatment
- droplet/leaf interface areae0
- Outcome
- plant responsee0
- Direction
- positivee0
- Qualifier
- all growth regulatorse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant positive linear relationships were obtained between plant response and the logarithm of the droplet/leaf interface area for all growth regulators.”
t0“Phaseolus vulgaris L.”
The same questions in other papers
Gibberellic acid · molecular: metabolites · Phaseolus vulgaris (common bean)Positive and negative results
3 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- no effect
2 papers more in this group
See all 6 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.