Genetic Inheritance of Aluminum Tolerance in Oat
Caroline Moor Wagner; Sandra Cristina Kothe Milach and Luiz Carlos Federizzi
Abstract: Aluminum toxicity is an important factor that limits crop productivity in acid soils. Understanding the inheritance of this trait may help breeding programs to develop aluminum-tolerant cereal crops. The objectives of this work were to study this trait in oat (Avena sativa L.) genotypes not yet investigated and to determine the allelic relationships between aluminum tolerant genotypes. Three tolerant (UFRGS 17, UFRGS 93605 and UFRGS 15), two sensitive genotypes (UFRGS 911715 and UFRGS 93598), and their respective F, populations were evaluated for root regrowth in the presence of 20 ppm of aluminum. One dominant gene for tolerance was identified in crosses involving UFRGS 17 and UFRGS93605 and two genes with epistasis in crosses with UFRGS 15, indicating that the tolerant genotypes included in this study have different genetic constitution.