Abstract
Morphogenic and growth processes were studied in relation to photosynthetically active radiation (PAR), and red, far red and blue spectral bands monitored at three different heights of a peach canopy during the vegetative season. The PAR intercepted by the bottom of the tree was significantly lower than that at the top, and blue fluence rate changed with height and season in a manner similar to PAR. Phytochrome photoequilibria indicated spatial and temporal differences in the three layers of the canopy: significantly lower values were detected at the bottom in correspondence with the maximum leaf area index. In this layer, a stimulation of internode elongation and a decrease of flower density were detected. Higher shoot growth rates and about double number of lateral shoots were found at the top of the canopy, where a greater number of sun leaves was present. Possible explanations in terms of different growth strategies induced by shade, depletion of blue, and low phytochrome levels at the bottom of the canopy are given.
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Claims 8
Claim · model-written summary
Photosynthetically active radiation was significantly lower at canopy bottom than top.
- Taxon
- peach tree
Prunus persicat0 - Outcome
- PAR interceptede0
- Direction
- lowere0
- Comparator
- tope0
- Setting
- bottom of the treee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“peach tree”
e0“The PAR intercepted by the bottom of the tree was significantly lower than that at the top”
Claim · model-written summary
Blue fluence rate varied with canopy height and season similarly to PAR.
- Taxon
- peach treePrunus persicat0
- Outcome
- blue fluence ratee0
- Direction
- changede0
- Qualifier
- with height and seasone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“peach tree”
e0“blue fluence rate changed with height and season in a manner similar to PAR”
Claim · model-written summary
Phytochrome photoequilibria were significantly lower at canopy bottom when leaf area index was maximal.
- Taxon
- peach treePrunus persicat0
- Outcome
- Phytochrome photoequilibriae0
- Direction
- lowere0
- Qualifier
- maximum leaf area indexe0
- Setting
- bottome0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“peach tree”
e0“Phytochrome photoequilibria indicated spatial and temporal differences in the three layers of the canopy: significantly lower values were detected at the bottom in correspondence with the maximum leaf area index”
Claim · model-written summary
Internode elongation was stimulated at the canopy bottom.
- Taxon
- peach treePrunus persicat0
- Outcome
- internode elongatione0
- Direction
- stimulatione0
- Setting
- bottome1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“peach tree”
e0“In this layer, a stimulation of internode elongation and a decrease of flower density were detected”
e1“at the bottom in correspondence with the maximum leaf area index”
Claim · model-written summary
Flower density decreased at the canopy bottom.
- Taxon
- peach treePrunus persicat0
- Outcome
- flower densitye0
- Direction
- decreasee0
- Setting
- bottome1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“peach tree”
e0“In this layer, a stimulation of internode elongation and a decrease of flower density were detected”
e1“at the bottom in correspondence with the maximum leaf area index”
Claim · model-written summary
Shoot growth rates were higher at the canopy top.
- Taxon
- peach treePrunus persicat0
- Outcome
- shoot growth ratese0
- Direction
- Highere0
- Setting
- top of the canopye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“peach tree”
e0“Higher shoot growth rates and about double number of lateral shoots were found at the top of the canopy”
Claim · model-written summary
The canopy top had about twice as many lateral shoots.
- Taxon
- peach treePrunus persicat0
- Outcome
- number of lateral shootse0
- Direction
- doublee0
- Value
- about doublee0
- Setting
- top of the canopye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“peach tree”
e0“Higher shoot growth rates and about double number of lateral shoots were found at the top of the canopy”
Claim · model-written summary
More sun leaves occurred at canopy top.
- Taxon
- peach treePrunus persicat0
- Outcome
- number of sun leavese0
- Direction
- greatere0
- Setting
- top of the canopye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“peach tree”
e0“where a greater number of sun leaves was present”
e1“at the top of the canopy”