Stability of QTL Over Environment

The environment may have a significant impact on the effect of QTL: a QTL detected in one environment may no longer be detected in another, or its effect may vary in magnitude (see Sect. 1.8.2). This has been frequently observed, although environmental influence differs according to the characters and the range of environments studied (Paterson et al. 1991). Certain QTLs are detected in all or almost all environments tested, while others are specific to a single environment. Several statistical methods for the estimation of QTL x environment interactions have been proposed (Zeng 1993).

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