Abstract

MAICH, R.; MANERO DE ZUMELZU, D.  and  DAVIDENCO, V.. Recurrent selection in hexaploid triticale (X Triticosecale Wittmack) under rainfed conditions. Agriscientia [online]. 2007, vol.24, n.1, pp.57-60. ISSN 1668-298X.

The objective of this study was to detect changes within an hexaploid triticale population submitted to a selection and recombination process under rainfed conditions. Ten S_1:2 (2004) and S_1:3 (2005) families per each one of analyzed recurrent selection cycles: C₀, C₁, C₂ y C₃, were evaluated. Completely randomized designs with two replications were used. At harvest, ten characters were measured or estimated. The recurrent selection cycles, years of evaluation and the interaction between them were considered as variation sources. Spike harvest index increased significantly at C₂ and C₃ with respect to C₀; not statistical differences between C₂ and C₃ were observed. The 1000 grain weight of C₃ was statistically superior than C₂. The selection and recombination process will be continued using a selection index that includes grain yield and its main components, introducing new fixed genotypes combinations of proved agronomical aptitude, derived from the different cycles of recurrent selection acchieved.

Keywords : Recurrent selection; Hexaploid triticale; Spike harvest index; Rainfed conditions.

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