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Stability Indexes for Isolines of Oats (Avena sativa L.)¹

An early group and a midseason group of oat (Avena sativa L.) isolines developed via backcrossing were yield tested in 15 environments with a range of productivity indexes from 25.5 to 42.9 q/ha. Isolines within a group were compared for mean grain yields and the stability indexes: regression coefficient (b) and deviations-from-regression (s²d)

The isolines in a group were quite homogeneous for appearance, plant height, heading date, and seed traits. For grain yield, however, three isolines in the early group and four in the midseason group produced grain yields significantly deviant from the respective recurrent parents. Two were negative and five were positive. The regression value for neither recurrent parent was significantly different from 1.0, but four early and five midseason isolines had b values significantly different from unity. Occasionally, if one isoline of a pair (i.e., one early and one midseason) with crown-rust resistance from the same donor cultivar had a b value less than unity, the other one had a b value greater than unity.

Key Words: Grain yield • Rust resistance • Linkage • Avena sterilis

² Professor of Plant Breeding.

Received for publication May 5, 1972.