Allelic effects (number of days) of <i>Rht-B1b</i> in a model that estimated days after 1 January to heading in 285 winter wheat entries grown in nine environments.

The environments are described in Table 1. The model terms were fit separately for each environment. The model effects included environment, Rht-B1, Rht-D1, and Rht-B1-by-environment interaction. The intercept (Int) describes the number of days from 1 January to heading in each environment before the allelic effects are applied. The allelic effect (number of days) at each locus is added to the Int value. The allelic effect of Rht-D1b was -2.68 days and did not have significant interaction with environment.