TAILIEUCHUNG - Báo cáo lâm nghiệp: "Seasonal and intraspecific variation of frost tolerance in leaves of three Canarian laurel forest tree species"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài:"Seasonal and intraspecific variation of frost tolerance in leaves of three Canarian laurel forest tree species" | Ann. For. Sci. 62 2005 423-428 423 INRA EDP Sciences 2005 DOI forest 2005038 Original article Seasonal and intraspecific variation of frost tolerance in leaves of three Canarian laurel forest tree species Águeda Ma González-Rodríguez Ma Soledad Jimenez Domingo Morales Dpto. de Biología Vegetal Universidad de La Laguna 38207 La Laguna Tenerife Spain Received 20 July 2004 accepted 3 March 2005 Abstract - The effect of freezing temperatures was studied in leaves of three tree species growing in the laurel forest of the Canary Islands relictic vegetation of Tertiary Mediterranean flora. The decrease in photochemical capacity of PSII Fv Fm was compared with visual assessment to determine the degree of frost damage 24 h after treatment. The study was carried out in sun and shade leaves and in two different seasons to obtain information about the intraspecific and seasonal variability of frost resistance of these three species. Our results showed that the studied species are sensitive to freezing temperatures Laurus azorica being the most resistant species undergoing damage at -10 C while Persea indica and Myrica faya were damaged at -6 C and -4 C respectively. In the warm season sun leaves were less resistant to freezing temperatures than in the cold season and these leaves showed lower resistance than shade ones. The frost resistance shown by these species was lower than that of most Mediterranean woody species. However the existence of other Mediterranean woody plants with similar sensitivity to freezing temperatures indicates that low temperatures were probably not the main cause in the past of their present confinement. chlorophyll fluorescence Laurus azorica Persea indica Myrica faya visual damage Résumé - Variation saisonnière et intraspecifique de la tolerance à la gelée des feuilles de trois espèces arborescentes de la forêt de laurier des ĩles Canaries. L effet du gel a été étudié chez des feuilles de trois espèces d arbres de la forêt de laurier des .

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