tailieunhanh - Báo cáo lâm nghiệp: " Impact of drought and leaf development stage on enzymatic antioxidant system of two Populus deltoides × nigra clones"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: " Impact of drought and leaf development stage on enzymatic antioxidant system of two Populus deltoides × nigra clones" | Ann. For. Sci. 63 2006 323-327 INRA EDP Sciences 2006 DOI forest 2006012 323 Original article Impact of drought and leaf development stage on enzymatic antioxidant system of two Populus deltoides X nigra clones Nicolas MARRONa b Stéphane MAURYa Cécile RINALDIa c Franck BRIGNOLASa a Laboratoire de Biologie des Ligneux et des Grandes Cultures UPRES EA 1207 UFR-Faculté des Sciences Université d Orléans rue de Chartres BP 6759 45067 Orléans Cedex 02 France b Present address University of Antwerp UA Department of Biology Campus Drie Eiken Research Group of Plant and Vegetation Ecology Universiteitsplein 1 2610 Wilrijk Belgium c Present address UMR INRA UHP 1136 Interaction Arbres Microorganismes INRA Centre de Recherches de Nancy 54280 Champenoux France Received 14 March 2005 accepted 12 September 2005 Abstract - Impacts of mild and severe water constraints were investigated on leaf protein content and activities of superoxide dismutase SOD catalase and peroxidase in young cuttings of two Populus deltoides X nigra clones Luisa_Avanzo and Dorskamp known to differ in their level of drought tolerance. Expanding and mature leaves were analyzed separately. The effect of water deficit on enzymatic antioxidant system depended on both clone and leaf development stage. For Dorskamp which presents an higher drought tolerance than Luisa_Avanzo activities of SOD and catalase increased in response to the severe water deficit in mature leaves only. For Luisa_Avanzo peroxidase activity increased in response to the mild water deficit in expanding leaves merely. For both clones three different SOD isoforms Mn-SOD Fe-SOD and Cu Zn-SOD were detected in various amounts depending on drought intensity. water deficit leaf development stage catalase superoxide dismutase peroxidase Résumé - Impact de la sécheresse et du stade de développement des feuilles sur les systèmes antioxydants enzymatiques de deux clones de Populus deltoides X nigra. L impact de sécheresses modérée et sévère sur