Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: fungal pathogens on water relations, chlorophyll fluorescence and growth of Quercus suber L. | 19 Ann. For. Sci. 56 1999 19-26 Inra Elsevier Paris Original article Effects of three fungal pathogens on water relations chlorophyll fluorescence and growth of Quercus suber L. Jordi Luquea Moshe Cohenb Robert Savéb Carmen Bielb Isabel F. Alvarez3 a Departament de Patologia Vegetal b Departament de Tecnologia Hortícola Institut de Recerca i Tecnologia Agroalimentàries IRTA Centre de Cabrils Ctra de Cabrils s n 08348 Cabrils Barcelona Spain Received 22 September 1997 revised 4 November 1997 accepted 11 March 1998 Abstract - Some physiological and growth parameters were studied in cork oak plants inoculated with three pathogenic fungi Botryosphaeria stevensii Hypoxylon mediterranean and Phytophthora cinnamomi in order to understand the effects of the fungal infection. All inoculated fungi induced the reduction of daily stem growth stomatai conductance air-leaf temperature and photochemical efficiency. The more aggressive pathogens B. stevensii and p. cinnamomi induced the sharpest decline in all growth and physiological parameters. A sudden decline of all variables was caused by B. stevensii within 6 days after inoculation followed by a temporary increase in maximum daily shrinkage coinciding with wilting of the plants. The plants inoculated with p. cinnamomi underwent a more gradual decrease in all parameters whereas H. mediterraneum induced a slight but still significant reduction only in stem growth and shrinkage. Linear variable displacement transducers LVDT proved to be a suitable tool to measure some effects of the pathogenesis. Inra Elsevier Paris. Botryosphaeria stevensii I Hypoxylon mediterraneum I Phytophthora cinnamomi I pathogenic effect hydric stress I LVDT Abbreviations DE daily evolution gs stomatai conductance Fv Fm maximum photochemical efficiency LVDT linear variable displacement transducer MDS maximum daily shrinkage TD air-leaf temperature difference. Resume - Effets de trois pathogènes fongiques sur les relations hydriques la fluorescence de la
