Estructura y productividad de una población silvestre de Physaria mendocina (Brassicaceae). Implicancias para su desarrollo como cultivo oleaginoso

  • Wanda J. Masnatta CONICET-Museo Egidio Feruglio, Dto. Plantas Actuales. Trelew, Chubut, Argentina.
  • Luciana González-Paleo CONICET-Museo Egidio Feruglio, Dto. Plantas Actuales. Trelew, Chubut, Argentina.
  • Damián A. Ravetta CONICET-Museo Egidio Feruglio, Dto. Plantas Actuales. Trelew, Chubut, Argentina.
Palabras clave: conservación, hierbas perennes, rendimiento, Patagonia, nuevos cultivos

Resumen

Physaria mendocina, es una hierba perenne nativa del Monte en Argentina, de la que existen pocas poblaciones conspicuas y que ha sido propuesta como un nuevo cultivo oleaginoso para zonas áridas. Evaluamos una población en el Parque Nacional Lihué Calel (La Pampa, Argentina) con los objetivos de: 1) caracterizar la distribución espacial, la densidad y la estructura de tamaños, y 2) determinar cómo se relacionan estos factores con la producción de semilla. Se esperaba una distribución agregada con parches de alta y baja densidad. Se evaluó la población durante tres años y se estudiaron las relaciones entre las variables demográficas y las productivas. La población de P. mendocina mostró un patrón de distribución agregado. En parches de menor densidad, aumentó la proporción de individuos de mayor tamaño, en contraposición a los parches más densos, donde prevalecieron individuos más pequeños. Las plantas de menor tamaño tuvieron menor acumulación de biomasa y producción de semilla, jerarquizando la asignación de biomasa hacia estructuras subterráneas. La biomasa individual es el componente que mejor explicó la variación del rendimiento por planta entre individuos de tamaño diferente. El entendimiento de los mecanismos funcionales determinantes de la producción de semillas es un requisito para la conservación y la domesticación de esta especie.

Citas

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Publicado
2012-12-01