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New Forests

, Volume 28, Issue 2–3, pp 195–200 | Cite as

Juvenile selection of Gmelina arborea clones in the Philippines

  • Francisco M. Padua
Article

Abstract

Data collected periodically from one of the oldest Gmelina arborea Roxb. (gmelina) clonal trials of Provident Tree Farms Incorporated in the Philippines were analyzed to identify what clones were genetically superior. Age–age correlations were also examined to determine the efficacy of early clonal selection. Results showed that among the 11 clones of Gmelina arborea that were tested, two clones, 25 and 26, were the best performers. At 72 months, these two clones had an average per tree volume of 0.675 m3 and 0.725 m3 and diameter at breast height of 28.9 cm and 29.3 cm, respectively. Analysis of juvenile data also showed that these two clones were consistently the best at a young age. Of the two juvenile traits measured (basal diameter and total height), total height at 9 months of age was the best predictor of performance at 72 months with genetic correlations ranging from 0.50 to 0.90. These results suggests that early selection at 9 months in gmelina clonal plantings is feasible and is a practical means of reducing the breeding and testing cycles.

Palabras clave: Correlaciones de edad–edad, Productividad, Propagación

Resumen. Se analizaron los datos recolectados periódicamente de uno de los ensayos clonales más antiguos de Gmelina arborea (gmelina) localizado en las Filipinas, en la finca de árboles Provident Tree Farm Inc Para identificar los clones genéticamente superiores. Así mismo se examinaron las correlaciones de edad–edad, para determinar la eficacia de la selección clonal temprana. Los resultados mostraron que entre los 11 clones de Gmelina arborea que fueron ensayados, dos clones, los números 25 y 26 fueron los que dieron mejores resultados y a los 72 meses de edad, estos dos clones tuvieron un promedio de volumen por árbol de 0.675 m3 y 0.725 m3 y diámetro a la altura de pecho de 28.9 cm y 29.3 cm, respectivamente. El análisis de datos de edad temprana también mostró a estos dos clones como los mejores consistentemente a edad temprana. De las dos características juveniles medidas (diámetro basal y altura total), la altura total a los 9 meses fué el mejor pronosticador del rendimiento del árbol a los 72 meses de edad, con correlaciones genéticas con un rango de 0.50 a 0.90. Estos resultados sugieren que es posible hacer selecciones tempranas, a los 9 meses de edad, en las plantaciones clonales de gmelina y que este es un medio práctico de reducir los ciclos de mejoramiento y de ensayos.

Age–age correlations Productivity Propagation 

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References

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Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  • Francisco M. Padua
    • 1
  1. 1.Forest Management and Technical Services DepartmentProvident Tree Farms IncorporatedManilaPhilippines(e-mail

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