Resumo

OSTENGO, Santiago et al. Assessment of the stability of a sugarcane (Saccharum spp.) cultivar in different environments by a non-parametric test in Tucumán, Argentina. Rev. ind. agric. Tucumán [online]. 2011, vol.88, n.2, pp.21-26. ISSN 1851-3018.

Genotype stability across different environments is an important attribute that has to be considered in a breeding program. It is for that reason that in sugar cane breeding, multienvironmental trials (MET) are conducted at the last stage of the selection process. There exist different approaches to study genotype-environment interaction. One of these is the non-parametric technique, a valid and useful tool which allows making an initial exploration that can be easily interpreted. The non-parametric technique called relative consistency of performance enables the classification of genotypes into the following four categories: (i) consistently superior; (ii) inconsistently superior; (iii) inconsistently inferior and (iv) consistently inferior. This work aims to evaluate the consistency of performance of TUC 95-10 variety across different agro-ecological environments in the province of Tucumán (Argentina), as regards the variable tons of sugar per hectare and considering different crop ages. Data were obtained from MET of the Sugarcane Breeding Program of Estación Experimental Agroindustrial Obispo Colombres (EEAOC) from Tucumán (Argentina), conducted at six sites through four crop ages. Results showed that TUC 95-10, recently released by EEAOC, can be labeled as consistently superior at all ages, i.e. it held the top position in sugar production in all tested environments. Therefore, it can be concluded that TUC 95-10 shows an excellent performance and good adaptation to different agro-ecological environments in Tucumán, at all crop ages.

Palavras-chave : Genotype-environment interaction; Non-parametric technique.

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