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/1.5 s within a 6 s cycle) and frequency of dark/light periods of equal length (0.04-10.33 Hz). Carbon exchange rate (CER) decreased in sun leaves as the duration of the dark phase increased; maximum reduction (38% 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. © 1995.

Intrieri, C., Zerbi, G., Marchiol, L., Poni, S., Caiado, T., Physiological response of grapevine leaves to lightflecks, <<SCIENTIA HORTICULTURAE>>, 2001; 61 (1-2): 47-59. [doi:10.1016/0304-4238(94)00724-T] [http://hdl.handle.net/10807/195145]

Physiological response of grapevine leaves to lightflecks

Poni, Stefano;
1995

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/1.5 s within a 6 s cycle) and frequency of dark/light periods of equal length (0.04-10.33 Hz). Carbon exchange rate (CER) decreased in sun leaves as the duration of the dark phase increased; maximum reduction (38% 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. © 1995.
1995
Inglese
Intrieri, C., Zerbi, G., Marchiol, L., Poni, S., Caiado, T., Physiological response of grapevine leaves to lightflecks, <<SCIENTIA HORTICULTURAE>>, 2001; 61 (1-2): 47-59. [doi:10.1016/0304-4238(94)00724-T] [http://hdl.handle.net/10807/195145]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10807/195145
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