Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Effect of Melampsora larici-populina on growth and biomass yield of eight clones of Populus nigra. | JOURNAL OF FOREST SCIENCE 57 2011 2 41-49 Effect of Melampsora larici-populina on growth and biomass yield of eight clones of Populus nigra V. Benetka K. Cerny P. Pilarová K. Kozlikova Silva Tarouca Research Institute for Landscape and Ornamental Gardening Prủhonice Czech Republic ABSTRACT This study evaluates the effect of the identified pathogenic races E1 E2 and E3 of the leaf rust Melamp-sora larici-populina on some growth traits and biomass yield in the species Populus nigra. A field trial was conducted with 8 clones of P. nigra using fungicide-sprayed and unsprayed treatments in 3 replications of 4 plants. In the course of three years the occurrence of the rust was evaluated on a six-point scale. The plant height and stem diameter were measured during the trial. In the last year the plants were harvested and the dry weight was determined. In the untreated plants a significant negative correlation was found between the intensity of rust occurrence and the values of stem diameter and dry matter yield P . A decline in dry matter yield caused by the rust was low below 9 or zero in a half of the clones while it ranged between 19 and 28 in the other half of clones. In some clones the yield decline was relatively low although the expression of rust symptoms was rather high which could be attributed to a tolerance to the given pathogen. Keywords biomass yield Melampsora larici-populina Kleb. poplar resistance The genus Populus L. comprises fast-growing woody plants suitable to be grown under shortrotation systems for the production of biomass as a renewable energy source. For these purposes clones interspecific hybrids originating from intrasectional as well as intersectional crosses are almost exclusively used. It should be noted that up to 60 of clones have P nigra Directory of Poplar FAO 2000 as one of the parental components. In recent years experiments have been conducted to test the yield potential and growth of the black poplar in coppice forests with .
