ON THE INHERITANCE OF TOLERANCE TO CHLOROTOLURON APPLICATION IN WHEATUSING A VERY EFFICIENT SCORE TEST

We present a nondestructive, easy to handle, cheap, fast and efficient assay to score wheat responses to herbicides. The application of the assay is illustrated by the reactions of the bread wheat cultivars 'Ca stan' and 'Recital' to the urea herbicide, chlorotoluron. The results not only confirm the presence of a major tolerant allele controlling t he differences in response between the two cultivars, but also, show t he contributions of modifier genes present in 'Castan','Recital' and o ther related cultivars.