Abstract
The influence of maternal tissues on loose smut (Ustilago nuda (Jens.) Rostr.) infection of hybrid tissues was investigated through histological studies of artificially inoculated kernels of susceptible and resistant varieties of barley and their reciprocal F1 hybrids. Depending on the stage of development of the kernel scanty to abundant mycelium was observed in the crease region, integument, aleurone, endosperm, and embryo of the susceptible kernels. In kernels of the resistant varieties, mycelium was not observed in the aleurone, endosperm, or embryo although present in the chalazal region and the parenchyma associated with the vascular bundle. After floret inoculation, the maternal tissues of F1 hybrid kernels of reciprocal crosses between the susceptible and resistant varieties had a mycelial development similar to that in the female parental varieties. Hybrid tissues of Odessa (susceptible) × Anoidium possessed a scanty mycelial development, whereas those of the reciprocal appeared to be free. Hybrid tissues of the reciprocal crosses between Odessa and Trebi had a scanty mycelial development. These observations indicated that maternal tissues influenced to some extent infection of the hybrid embryo. However, this influence appeared to be secondary in importance to that of the genotype of the embryo itself.
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