Variability and adaptability of selected poplar (Populus nigra) clones, based on stability parameters and AMMI model

Abstract

Poplars are among the most important wood trees that play a key role for provision of raw material for the cellulose industry. In order to study the genetic diversity, selection and introduction of superior and compatible clones in the west of Iran, this research was carried out. The experiment was set up based on randomized complete block design (RCBD) with three replications in eight years (2007 to 2014) at the Agricultural and Natural Resources Research Center of Kermanshah, Iran. From each clone 25 seedlings were planted with 3 × 3 meter spacing. The studied traits included: diameter at breast height, total height, current annual volume increment and wood volume. The results of mean comparison by Duncan test showed a significant difference between the clones at the level of 5%. The clon 62/154 had the greatest height, diameter, and wood volume. Combined analysis of variance revealed significant effect of Year I Clone interaction for all traits at 5% probability. Based on the cluster analysis, ten clones were grouped into three clusters. The clones 62/149 and 62/154 had the greatest distance of all all clones. Based on the AMMI model, and other stability parameters the clones P. nigra 56/75, P. nigra betulifolia, P. nigra mehregan, P. nigra 63/135, P. nigra 56/72 were selected as the highest productive clones and recommended to cultivation.