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

Author(s):

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

2. Noor Rahman: Agricultural Research Institute, Peshawar, Pakistan

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

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

Abstract:

The fully expanded new (FEN) leaves of grapevines (Vitis vinifera L.) appeared to be most sensitive to shading and A and gs increased by 55 and 20 percent respectively, within 30 minutes. This response was reversed when the shading was removed. Old and new leaves showed similar responses to change in light intensity. The progressive declines in gs and A was observed during the day in all leaf positions. The A:gs ratio was larger and Intercellular CO2 concentration (Ci) lower in the FEN leaves than in either the new or old leaves on the canopy.

Page(s): 136-141

DOI: DOI not available

Published: Journal: Pakistan Journal of Biological Sciences, Volume: 3, Issue: 1, Year: 2000

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