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Effects of MCPA Applied to Successive Generations of Flax¹

ABSTRACT

Application of high rates of [(4-chloro-o-tolyl)oxy] acetic acid (MCPA) on four relatively homogeneous populations of flax (Linum usitatissimum L.) for seven successive generations and on two heterogeneous populations for three successive generations (F₂, F₂, and F₄) caused no detectable genetic change in yield, oil content, iodine value, or maturity. Tolerance to MCPA was not increased by successive generation treatment with MCPA.

The lack of detectable mutants in the progenies of flax populations sprayed with high rates of MCPA for several successive generations suggested that MCPA was not mutagenic. The frequency of mutations should not be increased as a result of successive applications of MCPA to commercially grown flax cultivars or to breeding populations.

Key Words: MCPA tolerance • mutation frequency • selection breeding

¹ Cooperative investigations of the Minnesota Agr. Exp. Sta. and the North Central Region, ARS, USDA. Paper no. 7983, Scientific Journal Series.

² Research Agronomists, North Central Region, ARS, USDA, Univ. of Minnesota, St. Paul, 55101.

Received for publication June 9, 1972.