tailieunhanh - Báo cáo toán học: "he environmental effect on crown shape of common cypress clones in the Mediterranean countries"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: The environmental effect on crown shape of common cypress clones in the Mediterranean countries. | 277 Ann. For. Sci. 57 2000 277-286 INRA EDP Sciences Original article The environmental effect on crown shape of common cypress clones in the Mediterranean countries Alberto Santini and Alessandro Camussi1 - - a Istituto per la Patologia degli Alberi Forestali . Firenze Italy b Genetics unit Dept. of Agricultural Biotechnology University of Firenze Firenze Italy Collaborators a V. Di Lonardo A. Panconesi P. Raddi - Istituto per la Patologia degli Alberi Forestali . Firenze Italy b C. Andreoli J. Ponchet - INRA Antibes France c . Xenopoulos - Institute of Mediterranean Forest Ecosystem and Forest Products Technology Athena Greece d J. Pinto-Ganhao . Ramos - Universidade Técnica de Lisboa Laboratorio Patologia Vegetal Verissimo de Almeida Lisboa Portugal e . Tuset - Institut Valenciana de Investigaciones Agrarias Valencia Spain Received 3 July 1999 accepted 15 December 1999 Abstract - Crown shape of four different clones planted out in six experimental fields located in five European countries are described and compared using discriminant analysis. The correlations among the considered traits were computed for each clone in each location. The results of the discriminant analysis showed that the locations in which trees have grown have a greater discriminating effect than the clones themselves. It means that the ecological factors that characterize a particular location effectively mould the shape of the tree s crown. The phenotypic correlations between characters were altered when trees grow in different conditions. For one of the clones taken into account these changes are due to the differential phenotypic plasticity of the considered traits. This characteristic may have considerable implications on the breeding programs. A question is whether it is worth the effort to select clones from a particular environment and then use them under very different conditions of habitat. common cypress crown shape discriminant analysis phenotypic plasticity .