Abstract
The effect of gibberellic acid (GA 3 ) treatments on flowering was tested on three-year-old Hass trees. Two concentrations (50 or 250 ppm) and various application dates (March to May) were evaluated. Buds were collected from March to August and a microscopic study was undertaken to determine the effect of GA 3 treatments on flower development. Secondary inflorescence axis meristems, which are the first signs of floral development, were already present early in March. A single GA 3 treatment (50 or 250 ppm) applied in March therefore had no significant effect on flower development. However, GA 3 (250 ppm) applied three times (March + April + May) inhibited flower development for one season. 75%, 100% xylene) (Johansen,1940). Paraffin wax (paramat extra pastillated) was used for infiltration and embedding. Buds were sectioned with a rotary microtome at 12µm and stained with a safranin - fastgreen series. Sections were studied using a light microscope, and micrographs were taken with a Nikon DXM 1200 digital camera on a Nikon Optiphot microscope.
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Claims 3
Claim · model-written summary
Secondary inflorescence axis meristems were present early in March.
- Taxon
- avocado
Persea americanat0 - Organ / stage
- Secondary inflorescence axis meristemse0
- Outcome
- already present early in Marche0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Secondary inflorescence axis meristems, which are the first signs of floral development, were already present early in March.”
t0“avocado”
Claim · model-written summary
One March GA 3 application at 50 or 250 ppm had no significant effect on flower development.
- Taxon
- avocadoPersea americanat0
- Treatment
- GA 3 treatment (50 or 250 ppm) applied in Marche0
- Outcome
- flower developmente0
- Direction
- no significant effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A single GA 3 treatment (50 or 250 ppm) applied in March therefore had no significant effect on flower development.”
t0“avocado”
Claim · model-written summary
Three applications of 250 ppm GA 3 from March through May inhibited flower development for one season.
- Taxon
- avocadoPersea americanat0
- Treatment
- GA 3 (250 ppm) applied three times (March + April + May)e0
- Outcome
- flower developmente0
- Direction
- inhibitede0
- Qualifier
- for one seasone0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GA 3 (250 ppm) applied three times (March + April + May) inhibited flower development for one season.”
t0“avocado”
The same questions in other papers
Gibberellic acid · growth · Persea americana (avocado)Positive and negative results
2 papers in the same direction as this paper · 8 in the opposite direction
- positive
- positive
- positive
7 papers more in this group
See all 11 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.