Stability and adaptation of lentil genotypes in the dry coastal of VI Region, Chile

Francisco Tapia F.1, Luis Barrales V.2 y Gabriel Bascur B.1

Grain yield stability and adaptation of 141entil cultivars (11 advanced lines and 3 standard cultivars), grown in the dry coastal range (VI Region, Chile) at four environments (2 localities x 2 years) were studied. The method proposed by Eberhart and Russell (1966) was used, in which the environmental indexes were obtained by subtracting the mean yield of all cultivars in all environments from the mean yield of all cultivars in each environment. The yield of the cultivars was regressed on these indexes. Linear regression coefficient and deviation from regression were used as stability measure. To describe the adaptation response of individual genotypes, mean yields from each environment were contrasted with the mean yield of each genotype in those environments. The lines 1071 and 3074 showed high stability. They produced aboye average yields in all seasons at all sites, indicating that they have wide adaptability to the environments in the dry coast of VI Region. Line 3015 showed low stability, but high yields in improved environments, it was described as adapted to high-yielding environments. The standard cultivar Constitución exhibited the opposite type of adaptation with a relatively better perfomance in low yielding environments. Under standard selection procedures, several breeding lines with outstanding stability and wide or specific adaptation could have been discarded, It is believed that the use of additional parameters as those proposed by Eberhart and Russell (1966) in conjunction with average yield would be of significant benefit in the evaluation and characterization of advanced lentil breeding material.

Keywords: lentil, stability, adaptation, selection, genotype x environment interaction.
1 Estación Experimental La Platina (INIA), Casilla 439, Correo 3, Santiago, Chile,
2 Actualmente Pontificia Universidad Católica de Chile, Departamento Economía, Casilla 306, Correo 22, Santiago, Chile.