Abstract
Three telosomic lines ST-20L of cultivated oats, Avena sativa L., were studied for their different expression of spikelet characters. An A sterilis type of spikelet was observed in one monotelosomic line in contrast to the A. sativa type (exception for one reduced twisted geniculate awn on the primary floret only) present in its monosomic counterpart. The genes responsible for cultivated vs. wild type spikelet characters were located on the short arm of ST-20, and the expression of the wild characters was found to be influenced by other suppressors located on chromosome(s) other than ST-20. It seems that the suppression of wild types of spikelet characters in cultivated oats is governed by more than one gene complex located on different chromosomes.
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