Subcuticular growth of Alternaria brassicae in rapeseed

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Abstract
The early stages of infection by Alternaria brassicae (Berk.) Sacc. in the leaves of the susceptible rapeseed cultivar Candle (Brassica campestris L.) and the moderately susceptible cultivar Altex (B. napus L.) were studied by transmission electron and light microscopy. The pathogen became subcuticular after direct penetration. This was followed by colonization of the epidermal and the mesophyll cells. The histology of early stages of infection was found to be similar in the two cultivars. It is concluded that the basis of differential susceptibility of B. campestris and B. napus to A. brassicae does not reside in the early stages of host–pathogen interaction.