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Research ArticleArticle

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Arboriculture & Urban Forestry (AUF) June 1975, 1 (6) 106; DOI: https://doi.org/10.48044/joa.1975.1.6.106
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Davies, W. J. and T. T. Kozlowski. 1974. Stomatal responses of five woody angiosperms to light intensity and humidity. Can. J. Bot. 52: 1525-1534.

Stomatal responses to changes in light intensity and humidity were studied in green and chlorotic Fraxinus americana, Acer saccharum, Quercus macrocarpa, Citrus mitis, and Cercis canadensis seedlings. Stomata opened and closed faster in green than in chlorotic plants. Stomatal opening in chlorotic plants was faster in Acer than in other species, where stomata opened to equilibrium in about the same time. With changes in humidity from 20% to 80%, and the reverse, stomata of Fraxinus and Acer opened faster than they closed. Stomatal resistance was affected more by humidity changes at low light intensity than at high intensity. Postillumination CO2 bursts from leaves occurred in all species and were greater in green than in chlorotic plants. Physiological responses of stomata are discussed in relation to leaf anatomy and metabolism.

Les auteurs ont étudié les réactions des stomates à des changements d’intensité lumineuse et d’humidité relative chez des plantules vertes et chlorosées de Fraxinus americana, Acer saccharum, Quercus macrocarpa. Citrus mitis, et Cercis canadensis. Lest stomates s’ouvraient et se fermaient plus rapidement chez les plantes vertes que chez les plantes chlorosées. L’ouverture des stomates chez les plantes chlorotiques était plus rapide chez Acer que chez les autres espèces, ou l’ouverture des stomates prenait le même temps pouratteindre l’équilibre. A la suite de changements dans l’humidité relative de 20 à 80% et vice versa, les stomates de Fraxinue et d’Acer s’ouvraient plus rapidement qu’ils ne se fermaient. La résistance des stomates fut plus fortement affectée par des changements d’humidité à faible intensité lumineuse qu’à haute intensité. L’émission subite de CO2 par les feuilles après illumination a eu lieu chez toutes les espèces et était plus importante chez les plantes vertes que chez les plantes chlorosées. Les auteurs discutent les réactions physiologiques des stomates en relation avec l’anatomie et le métabolisme des feuilles.

  • © 1975, International Society of Arboriculture. All rights reserved.
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Arboriculture & Urban Forestry (AUF)
Vol. 1, Issue 6
June 1975
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Arboriculture & Urban Forestry (AUF) Jun 1975, 1 (6) 106; DOI: 10.48044/joa.1975.1.6.106

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Arboriculture & Urban Forestry (AUF) Jun 1975, 1 (6) 106; DOI: 10.48044/joa.1975.1.6.106
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