ISOLATION, IDENTIFICATION AND CHARACTERIZATION OF DISOMIC AND TRANSLOCATED BARLEY CHROMOSOME ADDITION LINES OF COMMON WHEAT

Two disomic barley chromosome addition lines and five translocated chr omosome addition lines of common wheat cultivar Shinchunaga were isola ted. They were derived from a hybrid plant between Shinchunaga and cul tivated barley Nyugoruden (New Golden) by backcrossing with wheat and self pollination. Barley chromosomes added or chromosome arms involved in the translocated chromosomes were identified by C-banding method a nd by crossing these lines with Chinese Spring/Betzes addition lines. Two disomic addition lines were identified to have chromosome 6 and 7 of barley, respectively. Two of the five translocated chromosome addit ion lines were clarified to have same chromosome constitution, 42 whea t chromosomes and a pair of translocated chromosomes constituted with a long arm of chromosome 5B of wheat and a short arm of chromosome 7 o f barley. The other three lines could not be identified due to chromos ome rearrangement. Performances of these seven lines on agronomic char acters were examined. Addition of barley chromosome 7 induced early he ading, and chromosome 6 showed lated heading. Almost all of the lines except that of chromosome 6 showed short culm length and all showed re duced number of tillers, spikelets and grains per ear, and low seed fe rtility. These lines would be useful for genetic analyses in wheat and barley and for induction of useful genes of barley into wheat.