Artículos de revistas
Selecting for stable and productive families of eucalyptus urophylla across a country-wide range of climates in Brazil
Fecha
2019-01-01Registro en:
Canadian Journal of Forest Research, v. 49, n. 1, p. 87-95, 2019.
1208-6037
0045-5067
10.1139/cjfr-2018-0052
2-s2.0-85059507405
1820626100081027
0000-0001-9088-3924
Autor
Via Comendador Pedro Morganti
Universidade Estadual Paulista (Unesp)
Universidade de São Paulo (USP)
APSD – Ghana
Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA)
Universidade Católica de Brasília
Institución
Resumen
To identify stable and productive Eucalyptus urophylla S.T. Blake families across diverse climate zones in Brazil, we evaluated growth and survival of 322 open-pollinated families derived from 13 genetically improved seed sources in 10 trials across the country. Survival and growth data were analyzed using linear mixed models and REML/BLUP. Survival ranged from 51% to 92%, and the mean annual increment varied from 19 to 46 m 3 ·ha −1 ·year −1 . Although planted in suitable climatic zones, some trials had low survival and (or) productivity. Conversely, the highest productivity was recorded in a zone considered to be of low suitability. These results show the importance of assessing the climatic requirements of eucalypts beyond those determined from analyses of their natural distribution, especially when testing already improved seed sources. A number of productive and stable families were identified based on analysis of the interaction between genotype and environment, and from these, 144 individuals were selected and had their genetic diversity estimated using 19 microsatellite DNA markers. The genetic diversity of these selected trees was equivalent to that observed in previous studies of natural populations of E. urophylla, indicating that breeding programs of E. urophylla in Brazil still retain high levels of diversity for sustainable genetic gains.