ISHS Acta Horticulturae 451: VI International Symposium on Integrated Canopy, Rootstock, Environmental Physiology in Orchard Systems
EFFECTS OF FRUITING ON SEASONAL LEAF AND WHOLE-CANOPY CARBON DIOXIDE EXCHANGE OF APPLE |
| Authors: | J.N. Wünsche, J.W. Palmer |
| Abstract:
The seasonal effect of fruiting and environmental impacts on leaf and whole-canopy carbon dioxide exchange was examined using mature six-year-old ‘Braeburn’/M.26 apple trees. Crop load affected leaf- and whole-canopy net CO2 uptake. Differences in average canopy net CO2 exchange were partly explained by average canopy light interception and night-time air temperature. Mid-season decline in photosynthesis was associated with an increase in leaf starch concentration as crop load decreased, presumably due to a lower carbohydrate requirement at this growth period. | |
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