Transgressive Segregation of Length of Latent Period in Crosses Between Slow Leaf-Rusting Wheat Cultivars

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Abstract
Six slow-rusting wheat cultivars [Suwon 85, SW 72469-7, SW 72469-6, L574-1, CI 13227 and CI 10745] were intercrossed to determine whether each cultivar possessed unique genes for long latent period during infection by Puccinia recondita. All crosses showed transgressive segregation. Within some transgressively segragating F2 populations, some plants had latent periods shorter than either parent and as short as that of the fast-rusting cultivar Morocco. Other F2 plants had latent periods longer than either parent and as long as that of the very slow-rusting cultivar C1 13227. These results indicate that most of the genes conditioning long latent period in these 6 cultivars differ from each other and that they show additive effects. Wheats with very long latent periods can be obtained by making crosses among different slow-rusting wheat cultivars.