Peroxidase Activity in Linum usitatissimum L.

Peroxidase activity was measured at three stages, from seedlingto maturity, in stem tissue of two genotypes of Linum usitatissimum,and their reciprocal F₁ hybrids. The plants were grown throughoutin growth chambers, allowing close control over the environmentalconditions. There were large and consistent differences betweenthe activities of the parental genotypes, and between dialysedand undialysed extracts. Activities in both parents and theF₁ were expressed on a logarithmic scale. The activity of theF₁ fell, with one exception, between the activities of the twoparents. The relationship of F₁ activity to the mean of theparental activities fluctuated with the stage of growth.