tailieunhanh - Báo cáo khoa học: "Chlorophyll fluorescence characteristics, performance and survival of freshly lifted and cold stored Douglas fir seedlings"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Chlorophyll fluorescence characteristics, performance and survival of freshly lifted and cold stored Douglas fir seedlings. | 225 Ann. For. Sci. 58 2001 225-235 INRA EDP Sciences 2001 Original article Chlorophyll fluorescence characteristics performance and survival of freshly lifted and cold stored Douglas fir seedlings Michael P. Perksa 5 Suzanne Monaghana Conor O Reillyb Bruce A. Osbornea and Derek T. Mitchella a Department of Botany University College Dublin Dublin 4 Ireland b Department of Crop Science Horticulture and Forestry University College Dublin Dublin 4 Ireland Received 1st August 2000 accepted 28 November 2000 Abstract - The physiological condition of three-year-old Douglas fir Pseudotsuga menziesii Mirb. Franco was periodically assessed from October to May 1998 1999 during propagation of seedlings in an Irish nursery. Seedling physiological status was evaluated in situ using determinations of chlorophyll fluorescence and plant water status. Pre- and post-cold stored either -2 oC or oC plant vitality was examined using determinations of root growth potential RGP root electrolyte leakage REL shoot water content and chlorophyll fluorescence. Data obtained from freshly lifted and cold stored stock showed that chlorophyll fluorescence provides a reliable non-destructive method of evaluating a seedlings potential field performance in both pre-lift direct planting and post-storage outplanting situations. Variations in survival and an index of plant health were paralleled by inverse changes in the effective quantum yield of photosystem II t PSII from November to April. Significant positive non-linear relationships were found between RGP and t PSII though they were of limited predictive ability in terms of outplanting performance. Post-storage fluorescence assessments indicated down-regulation and or damage of the plants photosynthetic light-harvesting complex which depended on storage temperature and duration. chlorophyll fluorescence cold storage plant quality photosystem II Pseudotsuga menziesii Résumé - Caractéristiques de la fluorescence chlorophyllienne performances et .