tailieunhanh - Báo cáo khoa học: "Osmotic adjustment in sessile oak seedlings in response to drought"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: "Osmotic adjustment in sessile oak seedlings in response to drought. | 389 Ann Sci For 1997 54 389-394 Elsevier Inra Note Osmotic adjustment in sessile oak seedlings in response to drought c Collet JM Guehl2 1 Equipe croissance et production 2 Equipe bioclimatologie et écophysiologie Unite écophysiologie forestiere Inra Nancy 54280 Champenoux France Received 22 August 1996 accepted 10 December 1996 Summary - Three-year-old sessile oak seedlings were submitted to drought developed at two different rates and 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 and MPa in the rapid and slow rates of drought development respectively and leaf osmotic potential at full turgor reached values and 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 versus MPa-MPa . Quercus petraea I water deficit osmoregulation Resume - Effets d une sécheresse édaphique sur 1 ajustement osmotique de jeunes plants de chêne. Des plants de chêne sessile âgés de 3 ans ont été soumis à des deficits hydriques se dévelop-pant à deux vitesses 0 050 et 0 013 MPajour1 obtenus en croisant deux niveaux d irrigation et de competition herbacée. A la tin de Tété le potentiel hydrique foliaire de base était de - 2 3 et - 0 8 MPa sous dessèchement rapide et sous dessèchement lent respectivement. Le potentiel osmo-tique 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 posi-tivement corrélés. Le dessèchemẹnt rapide a induit un degré d ajustement osmotique plus important 0 45 contre 0 34 MPa-MPa 1 sous dessèchement lent . Quercus petraea deficit hydrique osmoregulation Correspondence and reprints Tel 33 03 83 39 40 43 .

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