Yellowish-brown changes on leaves of winter rye (Secale cereale L.)

Two mutants of winter rye (Secale cereale L.) (hs(1) and hs(2)) with yellow ish-brown changes on leaves are described. Both forms were characterized by a lower number of tillers, but the heigth of plants and length of ears wer e similar to those in control plants. In mesophyll cells of these mutants t he number of chloroplasts and grana and the chlorophull content were lower than those in dark green plants. Genetic analysis of F-1, F-2 and backcross generations have proved that the trait of yellowish-brown changes is deter mined by the same recessive gene. This gene is designated yns after term "y ellow necrotic spots".