BREEDING STRATEGIES AND GENOMIC STUDIES FOR FAST GROWING PULPING TREES
Eucalypt fibres are on rapid expansion in the international pulp market, as plantations with that purpose expand. Examples of highly developed fast growing tree breeding programmes abound in the world and specially in the southern hemisphere. Breeding for wood production and fibre quality is increasingly important with traditional breeding methods and during the last two decades molecular studies and genomic knowledge are producing more opportunities for quick capture of improvements and genetic gains. Disease risk deserve a special chapter as exotic plantations increase and sustainability of forestry development is pursued. Strategies for implementation of those new tools can be developed which will speed up the improvement of plantations. Individual clones produce homogeneous timber but pulp mills could envisage problems from wood supply of different clones. Molecular markers for genes with important roles in the lignin pathways and wood density have been identified, hence molecular breeding of Eucalyptus can be achieved shortly. Production of full sib families from elite trees (selection from breeding values or marker assisted) is currently on going. Although the number of individual genotypes produced is not large, multi clonal varieties can be established and developed by vegetative propagation methods. The development of new inter-specific hybrids is leading to new discoveries on gene action and gene expression which in turn would lead to more effective breeding strategies. Hybrids like Eucalyptus grandis x urophylla; E. grandis x nitens; E. grandis x globulus, to mention a few examples, have shown that there is much to be gain with appropriate research. Multiple populations and sub lines breeding could facilitate the creation of such hybrids.
eucalyptus breeding hybrids genes multiclonal varieties vegetative propagation method
Jose P. Garcia De Leon
Compania Forestal Oriental S.A., 18 de Julio 818, Paysandu 60000, Uruguay Faculty of Agronomy, Department of Forestry, Av. Garzon 780, Montevideo, Uruguay
国际会议
广州
英文
84-86
2006-11-08（万方平台首次上网日期，不代表论文的发表时间）