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Ann. For. Sci.
Volume 54, Number 4, 1997
Page(s) 389 - 394
Ann. For. Sci. 54 (1997) 389-394
DOI: 10.1051/forest:19970406

Osmotic adjustment in sessile oak seedlings in response to drought

C Colleta and JM Guehlb

a  Équipe croissance et production, Unité écophysiologle forestière, Inra Nancy, 54280 Champenoux, France
b  Équipe bioclimatologie et écophysiologie, Unité écophysiologle forestière, Inra Nancy, 54280 Champenoux, France

Abstract - Three-year-old sessile oak seedlings were submitted to drought developed at two different rates (0.050 and 0.013 MPa·day-1). Drought was controlled by combining levels of irrigation and grass competition. At the end of summer, predawn leaf water potential reached values of -2.3 and -0.8 MPa in the rapid and slow rates of drought development, respectively, and leaf osmotic potential at full turgor reached values of -2.0 and -1.5 MPa, for the same treatments. For both treatments, leaf water potential and leaf osmotic potential were linearly and positively correlated. The rapid rate of drought development resulted in a greater degree of osmotic adjustment (0.45 versus 0.34 MPa·MPa-1).

Résumé - Effets d'une sécheresse édaphique sur l'ajustement osmotique de jeunes plants de chêne. Des plants de chêne aessile âgés de 3 ans ont été soumis à des déficits hydriques se développant à deux vitesses (0,050 et 0,013 MPa·jour-1), obtenus en croisant deux niveaux d'irrigation et de compétition herbacée. À la fin de l'été, le potentiel hydrique foliaire de base était de - 2,3 et -0,8 MPa sous dessèchement rapide et sous dessèchement lent, respectivement. Le potentiel osmotique foliaire à pleine turgescence était de - 2,0 et - 1,5 MPa dans les mêmes traitements. Dans les deux traitements, le potentiel hydrique de base et le potentiel osmotique étaient linéairement et positivement corrélés. Le dessèchement rapide a induit un degré d'ajustement osmotique plus important (0,45 contre 0,34 MPa·MPa-1 sous dessèchement lent).

Key words: Quercus petraea / water deficit / osmoregulation

Mots clés : Quercus petraea / déficit hydrique / osmorégulation

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