Genetic Analysis of the Latent Period of Stripe Rust in Wheat Seedlings

Genetics of slow-rusting resistance to yellow rust (Pucci-nia striiformis f.sp. tritici) was studied by a half-diallel design using six wheat varieties, Tiritea (susceptible), Tancred, Kotare, Otane, Karamu, and Briscard. The parents and 15 F1 progenies were evaluated in the green-house by three pathotypes 7E18A), 38E0A+, and 134E134A+. The latent period was measured as the number of days from inoculation to the appearance of the first pustule. For each pathotype a randomized com-plete block design was used and data were analysed by methods of Griffing and Hayman. The range of average degree of dominance was from complete dominance to over-dominance. Positive and negative degrees of dom-inance were observed for each pathotype that showe