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International Journal of Agricultural Research
  Year: 2007 | Volume: 2 | Issue: 1 | Page No.: 43-52
DOI: 10.3923/ijar.2007.43.52
 
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Seasonal Variations in Photosynthetic Activities of Pistachio Trees: A Comparison Between Fruiting (ON) and Non-Fruiting (OFF) Trees
B. Baninasab, M. Rahemi and B. Kholdebarin

Abstract:
The effects of photosynthetate demand on photosynthetic activity of pistachio (Pistacia vera L.) trees cv. Owhadi, which are characterized by strong alternate bearing were studied. Changes in seasonal leaf gas exchange, the amount of chlorophyll, leaves dry weight, leaf area and leaf specific weight in fruit bearing branches of ON trees and non-fruit bearing branches of OFF trees were determined. Rate of photosynthesis, stomatal conductance, transpiration rate, leaf mesophyll efficiency of ON trees measured forty and seventy Days After Full Blooming (DAFB) were significantly higher than those of OFF trees. Seventy DAFB, rates of photosynthesis, stomatal conductance, transpiration rates and leaf mesophill efficiency decreased in the two three groups, so that after this period there was no significant difference between ON and OFF trees with respect to these parameters. There was a decrease in internal CO2 concentration with the increase in photosynthetic rates. The amount of chlorophyll was higher in ON trees. However, the differences were only significant hundred and hundred thirty DAFB. Leaves on tress were smaller and had less weight than OFF trees. Leaf specific weights of OFF trees at hundred thirty and hundred sixty DAFB were significantly higher than that of ON trees.
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How to cite this article:

B. Baninasab, M. Rahemi and B. Kholdebarin, 2007. Seasonal Variations in Photosynthetic Activities of Pistachio Trees: A Comparison Between Fruiting (ON) and Non-Fruiting (OFF) Trees. International Journal of Agricultural Research, 2: 43-52.

DOI: 10.3923/ijar.2007.43.52

URL: https://scialert.net/abstract/?doi=ijar.2007.43.52

 
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