Changes in pH of the Root Medium Produced by Cultivars of Triticale
The induction of an increase in the pH of the root medium has been indicated for several plants as part of a strategy for living in acid soils. The possibility of such occurrence has been evaluated for some genetic lines of triticale and wheat for which there are also other indications of tolerance to acidity and high Al concentration. After germination, ten seedlings of each strain were grown in a convenient volume of nutrient solution with or without 5 ppm of Al for five days. The pH, ion conductivity of the solution and the length of the primary root were also measured after 2 and 5 days of growth. The change in pH was small in the presence of Al, but in the standard or diluted (1/5) nutrient solutions there were significant differences among genotypes. In standard solution the triticale Borba increased the pH significantly whereas the wheat Anza as well as the triticale Arabian induced minor changes. Since Arabian has been recognised as tolerant to Al this indicates that other mechanisms (not modification of pH) must be present in such plants.
KeywordsNutrient Solution Genetic Line Root Medium Relative Extension Aluminum Tolerance
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