The gas-exchange response of sun and shade grapevine leaves to various lightfleck regimes was investigated under laboratory conditions. Intermittent lighting varied as to the duration of the intervening dark/light intervals (3 s/3 s to 4.5 s/l .5 s within a 6 s cycle) and frequency of dark/light periods of equal length (0.04-l 0.33 Hz). Carbon Exchange rate (CER) decreased in sun leaves as the duration of the dark phase increased; maximum reduction (38Oh less than continuous light of similar photon flux density (PFD) ) was registered at 4.5 s/ 1.5 s dark/light. CER and transpiration ( T) were not significantly affected in shade leaves by lightflecks over varying light/dark intervals. CER increased both in sun and shade leaves with lightfleck frequency. Frequencies higher than 5 Hz resulted in CER rates very close to those found under continuous light of high intensity. Sun and shade leaves exposed to increasing areas of spot light revealed a more than proportional CER gain of up to 5% of lighted leaf area and then a steady linear increment. The results show that grape leaves grown under different light intensities may respond differently to regimes of alternating light.

Physiological responses of grapevine leaves to lightflecks

Zerbi, G.;Marchiol, L.;
1995-01-01

Abstract

The gas-exchange response of sun and shade grapevine leaves to various lightfleck regimes was investigated under laboratory conditions. Intermittent lighting varied as to the duration of the intervening dark/light intervals (3 s/3 s to 4.5 s/l .5 s within a 6 s cycle) and frequency of dark/light periods of equal length (0.04-l 0.33 Hz). Carbon Exchange rate (CER) decreased in sun leaves as the duration of the dark phase increased; maximum reduction (38Oh less than continuous light of similar photon flux density (PFD) ) was registered at 4.5 s/ 1.5 s dark/light. CER and transpiration ( T) were not significantly affected in shade leaves by lightflecks over varying light/dark intervals. CER increased both in sun and shade leaves with lightfleck frequency. Frequencies higher than 5 Hz resulted in CER rates very close to those found under continuous light of high intensity. Sun and shade leaves exposed to increasing areas of spot light revealed a more than proportional CER gain of up to 5% of lighted leaf area and then a steady linear increment. The results show that grape leaves grown under different light intensities may respond differently to regimes of alternating light.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11390/1135801
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