Abstract

FERREIRA, V et al. Genotype-environment interaction and stability in forage yield of triticale and tricepiro. BAG, J. basic appl. genet. [online]. 2015, vol.26, n.2, pp.27-51. ISSN 1852-6233.

Triticales and tricepiros are annual forage alternatives of winter cereals for the subhumid-semiarid pampean region of Argentina. Triticale (x Triticosecale Wittmack) derived from Triticum L. x Secale L. crosses in broad sense. Tricepiro is the common name of the trigeneric hybrids obtained from crosses between triticales and trigopiros (Triticum L. x Thinopyrum Á. Löve). The aim of this study was to analyze forage yield, genotypeenvironment interaction and stability in experimental strains. Twenty-three genotypes were tested for five years in Río Cuarto, Córdoba and Santa Rosa, La Pampa, Argentina, using a random complete block design. The genotype, environment and genotype-environment interaction main effects were determined by ANOVA. All of them were statistically significant. The stability was assessed using regression analysis, Pi index and AMMI2 and SREG models. A strain of triticale had high performance and low genotype-environment interaction with all methods. Another triticale strain showed high yield and stability in regression analysis and Pi index, high yield but low stability in AMMI, and high performance in only one environment according to SREG. Regarding tricepiro, four strains of higher than average forage yield were stable according to the regression method. However, the Pi index qualified only one as stable and all of them were unstable in AMMI analysis. The SREG method qualified one of these tricepiro strains as stable with high yield, another with median stability and good yield but near the average, and the remaining two were qualified as unstable. The combination of regression and SREG analyses was the most appropriate to analyze stability of these materials. Three strains were identified to be released as cultivars.

Keywords : Hybrid triticeas; Forage yield; Genotype-environment interaction; Stability.