The influence of short-term partial shading on photosynthesis and stomatal conductance in relations to water status of grapevines (Vitis vinifera L.)
1999
Nabi, G. (Agricultural Research Inst., Tarnab (Pakistan)) | Trought, M. | Whitehead, D.
This project was designed to investigate the impact of short term light intensity changes in relation -to water status of grapevine (Vitis vinifera. L.) cv. Pinot noir canopy. Shading caused a rapid increase in the net photosynthesis (A) and stomatal conductance (gs) of the illuminated part of the canopy. Water-stress reduced A and gs compared to well-watered vines. Intercellular CO2 concentration (Ci) was unaffected by shading or crop loading. The overall response by vines to partial shading was similar across all water stress treatments. It is concluded that in grapevines, the rapid changes in A and g in the illuminated part of the canopy caused by partial shading elsewhere, are regulated by hydraulic processes. However, the mechanisms by which stomata sense those changes are still unknown.
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