A selection of flax, C. I. 2484, having relatively high tolerance to atrazine (2‐chloro‐4‐ethylamino‐6‐isopropylamino‐s‐triazine) was crossed with ‘Koto,’ a susceptible variety. The F3 and backcross populations were tested for tolerance to atrazine. The atrazine tolerance exhibited by C. I. 2484 behaved as a quantitive character. Heritability (broad sense) of atrazine tolerance in F3 and BC1F2 populations was estimated to be 29 and 34%, respectively. This relatively low heritability indicates that selection for atrazine tolerance in flax populations will be difficult, at least with the procedures and the criterion used in this study.
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Cornstock et al. (1968) studied this question.