The influence of short-term partial shading on photosynthesis and stomatal conductance in relations to cropload of grapevines (Vitis vinifera L.). | [Pakistan Journal of Biological Sciences • 2000]

Author(s):

1. Ghulam Nabi: Horticulture Agricultural Research Institute, Peshawar, Pakistan, NWFP, Pakistan

2. Micheal Trought: Soil, Plant & Ecology Science Division Lincoln University, Canterbury, New Zealand

3. David Whitehead: Landcare Research Lincoln, Canterbury, New Zealand

Abstract:

The main objective of this study was to investigate the impact of Short-term light intensity changes in relation to crop loading on the net photosynthesis (A) and stomatal conductance (gs) of grapevine (Vitis vinifera L.) cv. Pinot noir. Shading caused a rapid increase in the net photosynthesis (A) and stomatal conductance (gs) of the illuminated part of the canopy. Fruiting grapevines had a higher A and gs (4.7 p.mol CO2m-2 s-1 and 0.08 mol H2O rn-2 s-1, respectively), than non-fruiting vines (2.9 μmol CO2m-2 s-1 and 0.05 mol H2O m-2s-1, respectively). Intercellular CO2 concentration (C1) was unaffected by shading or crop loading. It is concluded that crop load has significant role in the rapid changes in A and gs in the illuminated part of the canopy.

Page(s): 279-283

DOI: DOI not available

Published: Journal: Pakistan Journal of Biological Sciences, Volume: 3, Issue: 2, Year: 2000

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