Fifth supplementary list of wheat varieties classified according to their genotype for hybrid necrosis and geographical distribution of Ne-genes

Summary An account is given about the progress in the work of the last two years. Further work is being done on the geographical distribution of both the Ne-genes.The fifth supplement consists of 144 Ne₁-carriers, 208 Ne₂-carriers and 326 noncarriers, together 678 varieties. The total number of varieties is 2513 being 597 Ne₁-(23.8%), 654 Ne₂-(26.0%) and 1262 (50.2%) non-carriers.