tailieunhanh - Báo cáo lâm nghiệp: "Differences in morphological and physiological responses to water-logging between two sympatric oak species"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Differences in morphological and physiological responses to water-logging between two sympatric oak species . | Ann. For. Sci. 63 2006 849-859 INRA EDP Sciences 2006 DOI forest 2006068 849 Original article Differences in morphological and physiological responses to water-logging between two sympatric oak species Quercus petraea Matt. Liebl. Quercus robur L. Julien PARELLEa b Oliver BRENDELa Catherine BodEnEsc Daniel BERVEILLERa d Pierre DlZENGREMELa Yves JOLIVETa Erwin DREYERa a Centre INRA de Nancy UMR INRA-UHP 1137 Écologie et Écophysiologie Forestières IFR 111 Génomique Écophysiologie et Écologie Fonctionnelle 54280 Champenoux France b Faculté des Sciences BP 239 54506 Vandreuvre-lès-Nancy France c INRA-Université de Bordeaux UMR 1202 Biodiversité Génétique Écologie BioGEco 33612 Cestas Cedex France d Present address Univ. Paris-Sud UMR 8079 Laboratoire Écologie Systématique et Évolution Bat. 362 91405 Orsay Cedex France Received 24 October 2005 accepted 1 February 2006 Abstract - Pedunculate Quercus robur L. and sessile Q. petraea Matt. Liebl. oaks are known to display different ecological requirements particularly relative to root hypoxia induced by water-logging. Q. robur is more tolerant to hypoxia than Q. petraea. We designed an experiment aiming at identifying morphological and physiological responses to root hypoxia that might differ between the two species. Potted seedlings were submitted during seven weeks to a water-logging treatment with O2 concentrations below 3 mg L-1 in the vicinity of roots. The treatment induced growth cessation in both species. Q. petraea displayed a lower tolerance to hypoxia as demonstrated by the higher number of seedlings suffering shoot dieback and leaf chlorosis as compared to Q. robur. This difference should be related to the high number of adventitious roots and hypertrophied lenticels that were formed in Q. robur compared to Q. petraea. In the fine roots of the two species the activity of pyruvate decarboxylase PDC the key enzyme of the fermentative pathway was stimulated after 24 h of water-logging. Transcripts of PDC .