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An Inheritance Study of Tolerance to Atrazine in a Cross of Flax (Linum Usitatissimum L.)¹

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.

Key Words: Herbicide Tolerance • Quantitative Character

² Research Agronomist and Plant Physiologist, Crops Research Division, ARS. USDA, Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, Minn. 55101.

Received for publication March 18, 1968.

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