Abstract

LOZANO-DEL RIO, AJ et al. AMMI analysis of genotype-environment interaction and production potential of forage triticale (X Triticosecale Wittm.). Universidad y ciencia [online]. 2009, vol.25, n.1, pp.81-92. ISSN 0186-2979.

Forage for cut and grazing are very important in northern and central Mexico. Because of the differential response of genotypes in each environment, the development of new cultivars includes determining the production stability for future release in a certain region. Dry matter yield was evaluated per cut and accumulated in two cuts of 22 facultative and winter-intermediate triticale genotypes (X Triticosecale Wittm.) in 14 environments in northern Mexico during the cycles of 1996-1997 to 1999-2000. Single and accumulated production were analysed with the AMMI model (Additive Main Effects and Multiplicative Interaction), and the genotypes were characterised based on the extent of their interaction with the environment (IG*A) and on their yield stability. The analysis per cut efficiently identified genotypes based on their growth habit, and classified them accurately with respect to production and stability. The facultative genotypes 3 and 5 were recommended for only one cut and the winter-intermediate genotypes 7 and 13 for multiple cuts. The winter-intermediate genotype 13 was the most stable and productive for accumulated dry matter. The model effectively separated the two types of growth habit in the individual cuts in response to differences in phenology that afftected dry matter production. The AMMI model also efficiently characterised the genotypes with respect to their stability, and accurately detected the extent and sign of the interactions presented by each, both in the individual cuts and in the production of accumulated dry matter.

Keywords : Facultative; winter-intermediate; genotype-environment interaction; stability; AMMI model.