Abstract
Little is known about the radiation effect on the induction and differentiation phases of reproductive nodes of Coffea arabica L. This knowledge would allow defining shading levels, or planting densities, appropriate to maximize the development, the production and the sustainability of the coffee crop. Floral differentiation was evaluated in plants of ‘Catuai Vermelho IAC 81, cultivated under four radiation regimes (30, 50, 70 and 100%), by using different plastic screens. Plagiotropic branches with fruits were collected from february to september, for two consecutive years. Slides of longitudinal sections of the node regions were mounted for the characterization and quantification of histological stages of bud differentiation. The undifferentiated buds formation began in February and, their differentiation to reproductive buds, in April/May. At the end of July practically all buds were already reproducing. The percentage of undifferentiated buds in February was 50% lower in 2005 because the sample branches had a large number of fruits in the basal region, indicating that the branches in a year of high production show a delay in flower bud differentiation in relation to the branches with few fruits during low productive years. The intermediate levels of shading, 50 to 70%, solar radiation, anticipated the development of buds from the plants grown under full sun in years of high production, the opposite occurred in the low productive years. The percentage of undifferentiated buds between irradiance treatments varied more than the percentage of reproductive buds, indicating that the radiation intensity has a greater effect in the early stages of floral differentiation.
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Claims 8
Claim · model-written summary
Undifferentiated buds began forming in February.
- Taxon
- Coffea arabica L.
Coffea arabicat0 - Organ / stage
- undifferentiated budse0
- Outcome
- undifferentiated buds formatione0
- Qualifier
- Februarye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The undifferentiated buds formation began in February”
t0“Coffea arabica L.”
Claim · model-written summary
Buds differentiated into reproductive buds in April or May.
- Taxon
- Coffea arabica L.Coffea arabicat0
- Organ / stage
- reproductive budse0
- Outcome
- differentiation to reproductive budse0
- Qualifier
- April/Maye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“their differentiation to reproductive buds, in April/May.”
t0“Coffea arabica L.”
Claim · model-written summary
Nearly all buds were reproductive by late July.
- Taxon
- Coffea arabica L.Coffea arabicat0
- Outcome
- practically all buds were already reproducinge0
- Qualifier
- end of Julye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the end of July practically all buds were already reproducing.”
t0“Coffea arabica L.”
Claim · model-written summary
Undifferentiated buds were 50% lower in February 2005 with many basal fruits.
- Taxon
- Coffea arabica L.Coffea arabicat0
- Organ / stage
- basal regione0
- Outcome
- percentage of undifferentiated budse0
- Direction
- lowere0
- Value
- 50%e0
- Qualifier
- large number of fruitse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The percentage of undifferentiated buds in February was 50% lower in 2005 because the sample branches had a large number of fruits in the basal region”
t0“Coffea arabica L.”
Claim · model-written summary
High-production branches showed delayed flower bud differentiation compared with low-production branches.
- Taxon
- Coffea arabica L.Coffea arabicat0
- Outcome
- flower bud differentiatione0
- Direction
- delaye0
- Qualifier
- year of high productione0
- Comparator
- branches with few fruitse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“branches in a year of high production show a delay in flower bud differentiation in relation to the branches with few fruits during low productive years.”
t0“Coffea arabica L.”
Claim · model-written summary
Intermediate radiation advanced bud development over full sun in high-production years.
- Taxon
- Coffea arabica L.Coffea arabicat0
- Treatment
- 50 to 70%, solar radiatione0
- Outcome
- development of budse0
- Direction
- anticipatede0
- Qualifier
- years of high productione0
- Comparator
- full sune0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The intermediate levels of shading, 50 to 70%, solar radiation, anticipated the development of buds from the plants grown under full sun in years of high production”
t0“Coffea arabica L.”
Claim · model-written summary
The radiation effect reversed in low-production years.
- Taxon
- Coffea arabica L.Coffea arabicat0
- Outcome
- oppositee0
- Qualifier
- low productive yearse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the opposite occurred in the low productive years.”
t0“Coffea arabica L.”
Claim · model-written summary
Undifferentiated-bud percentages varied more between irradiance treatments than reproductive-bud percentages.
- Taxon
- Coffea arabica L.Coffea arabicat0
- Outcome
- percentage of undifferentiated budse0
- Direction
- varied more thane0
- Comparator
- percentage of reproductive budse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The percentage of undifferentiated buds between irradiance treatments varied more than the percentage of reproductive buds”
t0“Coffea arabica L.”
The same questions in other papers
light · growth · Coffea arabica (arabica coffee)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- negative
- positive
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.