Tests were conducted to evaluate the presence of controlling elements in 'Iowa Stiff Stalk Synthetic' (BSSS) population, the original inbred lines for BSSS population, inbred line derivatives of BSSS population, and Lancaster populations of different sources.

Mrh element was the most prevalent among the original inbred lines. It was also exposed in two cycles of selection, however, it was not recovered in the derivative inbred lines.

Cy element expressed low activity among original inbred lines that exhibited mutability. This pattern was carried through two cycles of selection and did not appear in the inbred line derivatives of BSSS population.

Uq element was uncovered in only one original inbred line and was channelled through cycles of selection and inbred line derivatives of BSSS population. The failure to uncover the elements Mrh and Cy in two cycles of selection could be due to sampling or those elements were lost during the recombination process.

Among nine Lancaster populations tested for the presence of elements, six exhibited Uq mutability, one the Cy element, one the En element, and none with the Mrh element.

From these results the Uq element was the most prevalent in BSSS and Lancaster populations.

Missae Karasawa and Peter A. Peterson

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