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Research ArticleArticle

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Arboriculture & Urban Forestry (AUF) July 1975, 1 (7) 139; DOI: https://doi.org/10.48044/joa.1975.1.7.139
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Kozlowski, T. T., W. J. Davies, and S. D. Carlson. 1974. Transpirations rates of Fraxinus americana and Acer saccharum leaves. Can. J. For. Res. 4: 259-267.

Experiments were conducted in the greenhouse and under constant environmental conditions on transpiration rates and stomatal aperture of intact seedlings and excised leaflets or leaves of Fraxinus americana and Acer saccharum. Leaf surfaces of both species were studied with scanning electron microscopy. Transpiration rates on a leaf area or dry weight basis were consistently higher for Fraxinus than of Acer seedlings. The higher transpiration capacity of Fraxinus was associated with larger (but fewer) stomata, less efficient stomatal closure, and less effective cutinization than in Acer. The paramount importance of control of stomatal aperture in influencing internal water balance of plants is emphasized.

On a conduit, dans des conditions ambiantes constantes en serre, des expériences sur les taux de transpiration et d’ouverture des stomates de semis intacts et de folioles ou de feuilles de Fraxinus americana et Acer saccharum. La surface des feuilles des deux espèces a été étudiée par microscopie électronique à balayage. Les taux de transpiration par unité de poids ou de surface foliaire étaient toujours supérieurs chez les semis de Fraxinus. La capacité de transpiration plus élevée chez Fraxinus, comparativement à Acer était liée à des stomates plus grands (mais moins nombreux), une fermeture stomatale moins efficace, et une cutinisation moins effective. L’article met l’accent sur l’importance primordiale de contrôle de l’ouverture stomatale sur l’équilibre interne de l’eau des plantes.

  • © 1975, International Society of Arboriculture. All rights reserved.
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Arboriculture & Urban Forestry (AUF)
Vol. 1, Issue 7
July 1975
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Arboriculture & Urban Forestry (AUF) Jul 1975, 1 (7) 139; DOI: 10.48044/joa.1975.1.7.139
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