Abstract
Photoselective nets are an emerging technology that might affect apple tree productivity and fruit quality. However, the physiological aspects involved in these photo-responses are not yet fully understood. The aim of this research was to evaluate the effects of photoselective nets on apple leaf gas exchange. Two-year-old ‘Fuji’ apple trees grown in 40-L pots were covered with shade or hail nets, according to the following treatments: red shade net (RS), grey shade net (GS), blue shade net (BS), pearl hail net (PH), red hail net (RH). Light transmission (400-800 nm) spectra, leaf net photosynthesis (PN) and net transpiration (E) were measured under nets. Photosynthetically active radiation (400-700 nm) transmission was reduced 20.2% by RH, 12.5% by PH, 41.9% by RS, 46.3% by BS and 56.3% by GS. Spectral composition was unaltered by GS and PH nets, while RH, RS and BS substantially changed the blue:red light proportion. GS, RS and BS nets significantly increased E compared to RH and PH, while under BS, PN was significantly higher than RS, RH and PH. Differences on PN and E under photoselective nets are linked to changes in light quantity, but also in light quality, which probably affect anatomical and morphological aspects. These responses are currently being assessed.
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Claims 9
Claim · model-written summary
RH reduced photosynthetically active radiation transmission by 20.2%.
- Taxon
- APPLESt0
- Treatment
- RHe0
- Outcome
- Photosynthetically active radiation (400-700 nm) transmissione0
- Direction
- reducede0
- Value
- 20.2%e0
Not reportedComparator
Verbatim
e0“Photosynthetically active radiation (400-700 nm) transmission was reduced 20.2% by RH”
t0“APPLES”
Claim · model-written summary
PH reduced photosynthetically active radiation transmission by 12.5%.
- Taxon
- APPLESt0
- Treatment
- PHe0
- Outcome
- Photosynthetically active radiation (400-700 nm) transmissione0
- Direction
- reducede0
- Value
- 12.5%e0
Not reportedComparator
Verbatim
e0“Photosynthetically active radiation (400-700 nm) transmission was reduced 20.2% by RH, 12.5% by PH”
t0“APPLES”
Claim · model-written summary
RS reduced photosynthetically active radiation transmission by 41.9%.
- Taxon
- APPLESt0
- Treatment
- RSe0
- Outcome
- Photosynthetically active radiation (400-700 nm) transmissione0
- Direction
- reducede0
- Value
- 41.9%e0
Not reportedComparator
Verbatim
e0“Photosynthetically active radiation (400-700 nm) transmission was reduced 20.2% by RH, 12.5% by PH, 41.9% by RS”
t0“APPLES”
Claim · model-written summary
BS reduced photosynthetically active radiation transmission by 46.3%.
- Taxon
- APPLESt0
- Treatment
- BSe0
- Outcome
- Photosynthetically active radiation (400-700 nm) transmissione0
- Direction
- reducede0
- Value
- 46.3%e0
Not reportedComparator
Verbatim
e0“Photosynthetically active radiation (400-700 nm) transmission was reduced 20.2% by RH, 12.5% by PH, 41.9% by RS, 46.3% by BS”
t0“APPLES”
Claim · model-written summary
GS reduced photosynthetically active radiation transmission by 56.3%.
- Taxon
- APPLESt0
- Treatment
- GSe0
- Outcome
- Photosynthetically active radiation (400-700 nm) transmissione0
- Direction
- reducede0
- Value
- 56.3%e0
Not reportedComparator
Verbatim
e0“Photosynthetically active radiation (400-700 nm) transmission was reduced 20.2% by RH, 12.5% by PH, 41.9% by RS, 46.3% by BS and 56.3% by GS”
t0“APPLES”
Claim · model-written summary
GS and PH left spectral composition unaltered.
Verbatim
e0“Spectral composition was unaltered by GS and PH nets”
t0“APPLES”
Claim · model-written summary
RH, RS and BS changed the blue:red light proportion.
Verbatim
e0“RH, RS and BS substantially changed the blue:red light proportion”
t0“APPLES”
Claim · model-written summary
GS, RS and BS increased transpiration relative to RH and PH.
Verbatim
e0“GS, RS and BS nets significantly increased E compared to RH and PH”
t0“APPLES”
Claim · model-written summary
BS had higher net photosynthesis than RS, RH and PH.
Verbatim
e0“under BS, PN was significantly higher than RS, RH and PH”
t0“APPLES”
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