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Báo cáo lâm nghiệp: "Seasonal changes of plant hydraulics, water relations and growth of Aesculus hippocastanum seedlings infested by the leafminer Cameraria ohridella"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài:"Seasonal changes of plant hydraulics, water relations and growth of Aesculus hippocastanum seedlings infested by the leafminer Cameraria ohridella" | Ann. For. Sci. 62 2005 99-104 99 INRA EDP Sciences 2005 DOI 10.1051 forest 2005001 Original article Seasonal changes of plant hydraulics water relations and growth of Aesculus hippocastanum seedlings infested by the leafminer Cameraria ohridella Fabio Raimondo Patrizia Trifilò Sebastiano Salleo Andrea Nardini Dipartimento di Biologia Università degli Studi di Trieste via L. Giorgieri 10 34127 Trieste Italy Received 19 January 2004 accepted 8 April 2004 Abstract - The leaf miner Cameraria ohridella causes premature defoliation in Aesculus hippocastanum. The impact of the parasite on seasonal changes of water relations hydraulics and growth of three-year-old A. hippocastanum seedlings was investigated. Leaf expansion was complete before the adults of the moth developed so that growth of infested seedlings was similar to that of controls. Leaf conductance to water vapour of infested seedlings was reduced with respect to controls both in mined and in still green portions of attacked leaves. In July and August the hydraulic resistance of infested seedlings was higher than that of controls due to anticipated increase of hydraulic resistance at the leaf petiole and current-year stem level. This was interpreted as evidence of anticipated leaf senescence in infested plants leading to early leaf abscission. Nevertheless our data suggest that under our experimental conditions C. ohridella is not a major mortality factor for A. hippocastanum seedlings. Cameraria ohridella Aesculus hippocastanum seedling hydraulic resistance leaf Résumé - Variations saisonnières des propriétés hydrauliques des relations hydriques et de la croissance de jeunes plants d Aesculus hippocastanum infestés par la mineuse foliaire Cameraria ohridella. La mineuse foliaire Cameraria ohridella provoque des defoliations prématurées chez le Marronnier Aesculus hippocastanum . L impact du parasite sur les variations saisonnières des relations hydriques des paramètres hydrauliques et de la croissance de .