Abstract
Stability of upland rice lines in Minas Gerais, Brazil
Highlights
The programs of genetic breeding of rice annually create a large number of lines which, after selection in preliminary trials, are tested in trials denominated Value for Cultivation and Use (VCU), for a particular regional scope, or for one or more Brazilian states
There are numerous methods to evaluate stability (Soares and Ramalho1993, Atroch et al 2000, Matos 2005), which differ in the estimates and mainly in the interpretation
It is up to the breeder to choose the methodology with greatest ease of interpretation that applies best to the given data
Summary
The programs of genetic breeding of rice annually create a large number of lines which, after selection in preliminary trials, are tested in trials denominated Value for Cultivation and Use (VCU), for a particular regional scope, or for one or more Brazilian states. The great difficulty breeders face, is to select lines with a good grain yield in the different environments for which they will be recommended, in other words, with minimal line x environments interaction. The determination of the grain yield stability of lines - denominated elite lines in VCU trials - enables breeders to issue sound cultivar recommendations, in spite of the variable environmental conditions which, among other factors, include year, soil, climate, planting date, and crop diseases and management. This study evaluated the stability of lines of upland rice tested in the VCU trials of Minas Gerais in 2003/2004 and 2004/2005, using the methodologies of Lin and Binns (1988) and Annicchiarico (1992)
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