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World view of Gmelina arborea: opportunities and challenges

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Abstract

Gmelina arborea Roxb. (gmelina) occurs naturally in 11 countries in tropical and subtropical regions of Asia. Approximately 700,000 ha of gmelina have now been established in plantations, small woodlots and agroforestry settings in west-central and eastern Africa, southeast Asia, the South Pacific, and northern Latin America. It is expected that planting areas will expand to 800,000 ha by 2020. The species has generated interest because of its fast growth and quick return on investment. Its wood can be used for a multitude of products that range from pulp to furniture parts. Gmelina also has great utility in agroforestry systems. Intensive breeding and improved clones will bring better growth, more uniform wood, better disease resistance, and products of higher quality to both local and international markets. Several factors might limit the degree of improvement and use of gmelina: (a) the species is susceptible to insect attacks and disease which might limit plantation expansion, (b) artificial pollinations are labor intensive and sometimes difficult to complete successfully, thus delaying breeding cycles and deployment of elite populations and clones and (c) the wood density of gmelina is approximately 410 kg/m3 at 8 years of age, which is lower than most commercial species of eucalypts and acacias. Low density affects pulp yields and product strength. These challenges can be met by: (a) development of clones resistant to insect and disease attacks as a cost effective means to maintain plantation stocking and productivity, (b) development of one-stop pollination techniques to increase pollination success rates and reduce the work loads in breeding programs, and (c) utilization of the great tree to tree variation in wood properties in gmelina to develop new races of trees that have both desirable growth rates and dense wood. Access to a broad genetic base of gmelina is central to meeting these challenges.

Palabras clave: Conservación, Mejoramiento, Plantaciones, Propiedades de madera, Silvicultura

Resumen. La Gmelina arborea Roxb. (gmelina) es nativa de 11 países, en regiones tropicales y subtropicales de Asia. Hasta el momento, aproximadamente 700,000 ha de gmelina han sido establecidas en plantaciones, lotes de árboles y en sitios agroforestales en el oeste central y el este de África, el sureste de Asia, el Pacifico Sur y el norte de América Latina. Se espera que para el año 2020, las áreas de plantación se hayan extendido a 800,000 ha. Esta especie ha generado interés debido a su rápido crecimiento y pronto retorno de inversión. Su madera puede ser utilizada en una multitud de productos, los cuales van desde pulpa de madera hasta partes para muebles. Además, la gmelina es de gran utilidad en programas agroforestales. El mejoramiento genético intensivo y clones mejorados darán como resultado un mejor crecimiento, madera más uniforme, mejor resistencia a las enfermedades y productos de mayor calidad tanto para los mercados locales como los internacionales.

Existen varios factores que pueden limitar el grado de mejoramiento y el uso de la gmelina: (a) la susceptibilidad de la especie al ataque de los insectos y las enfermedades, lo cual puede limitar la expansión de las plantaciones, (b) las polinizaciones artificiales requieren de mucha mano de obra y son dificiles de completar lo cual demora ciclos de mejoramiento y la utilización de las poblaciones élite y clones, y (c) la densidad de la madera de la gmelina a los 8 años de edad, de aproximadamente 410 kg/m3, es más baja que la densidad de la mayoría de las especies comerciales de eucalipto y acacias. La baja densidad afecta los rendimientos de pulpa y la fortaleza del producto. Estos retos pueden ser superados por medio de: (a) el desarrollo de clones resistentes al ataque de insectos y enfermedades como una forma económica y efectiva de mantener la densidad de plantaciones y su productividad, (b) el desarrollo de técnicas de polinización de un solo paso para aumentar las tasas de éxito de la polinización y reducir las cargas de trabajo en los programas de mejoramiento, y (c) el uso de la gran variabilidad de las propiedades de madera de la gmelina de árbol a árbol, para poder desarrollar nuevas razas de árboles las cuales tengan buenas tasas de crecimiento, y una densidad de madera deseada. El acceso a una amplia base genética es clave para poder alcanzar estos retos.

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Dvorak, W. World view of Gmelina arborea: opportunities and challenges. New Forests 28, 111–126 (2004). https://doi.org/10.1023/B:NEFO.0000040940.32574.22

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