Abstract

ABBOTT, L.  and  PISTORALE, S.. Stability and adaptability analysis of characters of agronomical interest in selected genotypes of prairie grass (Bromus catharticus). Agriscientia [online]. 2011, vol.28, n.2, pp.109-117. ISSN 1668-298X.

Thirteen genotypes of Bromus catharticus were evaluated over a three year period, using a completely randomized experimental design with six replications. Individual plants were analyzed for the number of panicles, number of seeds and weight of 1000 seeds. The genotype x environment interaction was statistically significant and it indicates a different performance of genotypes throughout the years. After verifying the interaction, three methodologies were applied in order to assess the stability and adaptability of the genotypes. These were: the Wricke's ecovalence, the Lin & Binns index and the model by Eberhart & Russell. These last two methods agree in identifyinthe same genotypes for the traits studied as stable and adaptable, while the coincidence with Wricke's method was partial. Considering the three methodologies used, the index of Lin & Binns is easy to apply and to interpret because it is always related to higher yield, greater stability, and it does not present any of the restrictions of using regressions. However, it is necessary to gather more information before this method can be widely used.

Keywords : Prairie grass; Genotype-environment interaction; Yields of seed; Genetic improvement.

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