Abstract
Spraying a zeatin solution on the mature leaf of an intact sunflower plant (Helianthus annuus L. cv. Large Russian) caused a two-fold decrease in leaf temperature during the 20 min after treatment. Scanning electron microscope photographs taken 2 min after cytokinin treatment, however, showed a small but distinct stimulation of the opening of the central pore of the stomata, indicating that the latent period of cytokinin-induced stomatal opening is only 2 min. Five minutes after treatment with zeatin, the stomata at both the central pore and the outer ledge had opened widely. On the other hand, zeatin riboside treatment did not show a distinct effect on the stomatal opening within these periods. The stomata of a water-sprayed leaf closed within 1 min after the treatment.
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Claims 5
Claim · model-written summary
Zeatin spraying decreased sunflower leaf temperature two-fold within 20 minutes.
- Taxon
- sunflower plant
Helianthus annuuse0 - Material
- Large Russiane0
- Organ / stage
- mature leafe0
- Treatment
- Spraying a zeatin solutione0
- Outcome
- leaf temperaturee0
- Direction
- decreasee0
- Value
- two-folde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Spraying a zeatin solution on the mature leaf of an intact sunflower plant (Helianthus annuus L. cv. Large Russian) caused a two-fold decrease in leaf temperature during the 20 min after treatment.”
Claim · model-written summary
Cytokinin stimulated central stomatal pore opening within two minutes.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- cytokinin treatmente0
- Outcome
- opening of the central pore of the stomatae0
- Direction
- stimulatione0
- Value
- 2 mine0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Scanning electron microscope photographs taken 2 min after cytokinin treatment, however, showed a small but distinct stimulation of the opening of the central pore of the stomata”
t0“Sunflower Leaf”
Claim · model-written summary
Five minutes after zeatin, central pores and outer ledges were widely open.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- zeatine0
- Outcome
- stomata at both the central pore and the outer ledge had opened widelye0
- Qualifier
- Five minutes after treatmente0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Five minutes after treatment with zeatin, the stomata at both the central pore and the outer ledge had opened widely.”
t0“Sunflower Leaf”
Claim · model-written summary
Zeatin riboside did not produce a distinct stomatal opening effect in these periods.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- zeatin riboside treatmente0
- Outcome
- stomatal openinge0
- Direction
- did not show a distinct effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“zeatin riboside treatment did not show a distinct effect on the stomatal opening within these periods.”
t0“Sunflower Leaf”
Claim · model-written summary
Water-sprayed leaves closed stomata within one minute.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- water-sprayede0
- Outcome
- stomatae0
- Direction
- closede0
- Value
- 1 mine0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The stomata of a water-sprayed leaf closed within 1 min after the treatment.”
t0“Sunflower Leaf”
The same questions in other papers
application · soil: physics · Helianthus annuus (common sunflower)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
1 paper more in this group
See all 5 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.