Ensayos de tolerancia al aluminio de Bromus stamineus y Bromus lithobius Recolectados en el sur de Chile

摘要

A study was made on the effects of several soil treatments on different ecotypes of plants of the genus Bromus to determine the tolerance to aluminum under different soil condition. For the first step, out of 20 ecotypes of Bromus lithobius and Bromus stamineus, the ecotypes PRO 95-18, PRO 94-25, PRO 94-24, PRO 94-49 and PRO 94-4 were selected, as they represented a declining order of tolerance to aluminum. Root growth of all the ecotypes was evaluated over four day exposures in aluminum solutions at 0, 20, 40, 80 and 160 mM. A second stage of testing was carried out in soil containing 42.6% saturation of aluminum, modified by three doses of calcium carbonate. Evaluation was made of dry root material produced, as well as concentrations of aluminum in the roots and leaves. It was concluded that behavior of the plants was different between the solution tests and the soil tests due to different mechanisms of tolerance, of which ecotype PRO 94-49 was outstanding in its tolerance to aluminum under soil test conditions.