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Differences in morphological and physiological responses to water-logging between two sympatric oak species (Q. Petraea [Matt.] Lieb., Q. Robur L.) Inra
Parelle, J.; Brendel, O.; Bodénès, C.; Berveiller, D.; Dizengremel, P.; Jolivet, Y.; Dreyer, E..
Les chênes pédonculé (Quercus robur L.) et sessile (Quercus petraea [Matt.] Liebl.) présentent des différences de tolérance à l’hypoxie racinaire induite par ennoyage, Q. robur étant plus tolérant que Q. petraea. Nous avons mené une expérience visant à identifier des différences inter-spécifiques dans les réponses morphologiques et physiologiques à l’hypoxie racinaire. Des semis en pots ont été soumis à un ennoyage de 7 semaines avec une concentration en O2 maintenue en dessous de 3 mg L−1 au voisinage des racines. Le traitement a provoqué un arrêt de croissance chez les deux espèces. Q. petraea a montré une plus faible tolérance que Q robur, avec un nombre plus élevé de plants présentant un dessèchement de l’appareil aérien ainsi qu’une plus forte...
Tipo: Journal Article Palavras-chave: CHENE PEDONCULE; CHENE SESSILE; ENGORGEMENT DU SOL; TOLERANCE A L'EAU; RACINE; CROISSANCE; CARBONE; METABOLISME WATER-LOGGING; HYPOXIA; ADVENTITIOUS ROOT; HYPERTROPHIED LENTICEL; CARBON METABOLISM.
Ano: 2006 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2007f51264cb&uri=/notices/prodinra1/2009/12/
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The coupling of reducing power and stomatal conductance could improve the effective ozone uptake concept in a risk assessment model Inra
Le Thiec, D.; Jolivet, Y.; Hasenfratz- Sauder, M.P.; Bagard, M.; Dizengremel, P..
The tropospheric level of the phytotoxic air pollutant ozone has considerably increasedduring the last century and is expected to continue to rise. Long-term exposures of higherplants to low ozone concentrations affect biochemical processes prior to any detectablesymptoms of visible injury. On the other hand, the current critical level of ozone used todetermine the threshold for damaging plants (biomass loss) is still based on the seasonal sumof the external concentrations of the pollutant above 40 nl l-1 (AOT40). Taking into accountthe stomatal conductance, a more relevant concept is based upon the actual ozone flux in theleaf through the stomata (cumulative uptake of ozone = CUO). CUO however ignores theinternal capacity of leaf defense, which led to the...
Tipo: Meeting Paper Palavras-chave: STOMATAL CONDUCTANCE; OZONE; RISK ASSESSMENT.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2009d2e078a3&uri=/notices/prodinra1/2010/10/
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Vulnerability to ozone in anthropized ecosystems. Improvement of the threshold for risk assessment (VULNOZ project) Inra
Dizengremel, P.; Jolivet, Y.; Le Thiec, D.; Bethenod, O.; Castell, J.F.; Loubet, B.; Roche, R.; Repellin, A.; Noctor, G.; Lamaud, E..
Tipo: Meeting Paper Palavras-chave: OZONE.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201144217393&uri=/notices/prodinra1/2011/06/
Registros recuperados: 3
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