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Stability Indexes for Isolines of Oats ( Avena sativa L.) 1
Author(s) -
Frey K. J.
Publication year - 1972
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1972.0011183x001200060027x
Subject(s) - avena , biology , cultivar , grain yield , agronomy , oryza sativa , horticulture , mathematics , gene , biochemistry
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 42.2 q/ha. Isolines within a group were compared for mean grain yields and the stability indexes: regression coefficient (b) and deviations‐from‐regression (s 2 d). 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.