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| Formato: | Artículo científico |
| Lenguaje: | es |
| Publicado: |
Universidade Federal de Lavras
2011
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| Materias: | |
| Acceso en línea: | https://www.redalyc.org/articulo.oa?id=74418601005 |
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- Estimates of genetic gains for growth traits in young plants of Eucalyptus urophylla S. T. Blake Thais Galhardo Godoy Sebastião Carlos da Silva Rosado Agrociencias genetics forest improvement Initial growth of seedlings The objective of this study was the selection of superior genotypes for growth traits, correlating them to initial height growth in the fi eld, at age eight months. A random block design was used in the nursery, with eight clones, three replicates and four plants per plot. And a random block design was also used in the fi eld, with eight clones, four replicate blocks and nine plants per plot. Data being analyzed in the nursery at age 120 days included: height of fi eld seedling, at age eight months (Hc), height of nursery seedling (Hm), root collar diameter (Dc), shoot diameter (Db), shoot dry matter (PMSPA), root dry matter (PMSR), totaldry matter (PMST), ratio of shoot dry matter to root dry matter (PMSPA/PMSR), Dickson quality index of root collar diameter (IQD-Dc), Dickson quality index of shoot diameter (IQD-Db). Analyses of variance showed that signifi cant genetic differences exist among clones for all traits and, given the high heritability values found, the estimated genetic gains were generically very high. As for predicted indirect genetic gain, selection in nursery seedlings for Dc, PMSPA/PMSR, IQD-Dc provided the highest values of indirect gain in fi eld seedling height. 2011 artículo científico 0104-7760 https://www.redalyc.org/articulo.oa?id=74418601005 es http://www.redalyc.org/revista.oa?id=744 CERNE application/pdf Universidade Federal de Lavras CERNE (Brasil) Num.2 Vol.17