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- Title
Infection cycle of <italic>Alternaria brassicicola</italic> on <italic>Brassica oleracea</italic> leaves under growth room conditions.
- Authors
Macioszek, V. K.; Lawrence, C. B.; Kononowicz, A. K.
- Abstract
Development of the necrotrophic fungus <italic>Alternaria brassicicola</italic> was evaluated during infection of three cabbage varieties: <italic>Brassica oleracea</italic> var<italic>. capitata</italic> f. <italic>alba</italic> ‘Stone Head’ (white cabbage), <italic>B. oleracea</italic> var<italic>. capitata</italic> f<italic>. rubra</italic> ‘Langedijker Dauer’ (red cabbage) and <italic>B. oleracea</italic> var<italic>. capitata</italic> f<italic>. sabauda</italic> ‘Langedijker Dauerwirsing’ (Savoy cabbage). Following inoculation of cabbage leaves, conidial germination, germ tube growth, and appressorium formation were analysed during the first 24 h of infection. Differences in the dynamics of fungal development on leaves were observed, e.g. approximately 40% of conidia germinated on Savoy cabbage leaves at 4 h post‐inoculation (hpi) while only 20% germinated on red and white cabbage leaves. Leaf penetration on the three cabbage varieties mainly occurred through appressoria, rarely through stomata. Formation of infection cushions was found exclusively on red cabbage. Appressoria were first observed on red cabbage leaves at 6 hpi, and on white and Savoy cabbage leaves at 8 hpi. Conidiogenesis occurred directly from mature conidia at an early stage of fungal development (10 hpi), but later (48 hpi) it occurred through conidiophores. Disease progress and changes in the morphology of leaf surfaces were also observed. At the final 120 hpi measurement point, necroses on all investigated varieties were approximately the same size. Based on detailed light and electron microscopic analyses, an outline of the <italic>A. brassicicola</italic> infection cycle on <italic>B. oleracea</italic> leaves under growth room conditions has been proposed. According to the authors’ knowledge, this report represents the most detailed up‐to‐date description of infection of <italic>B. oleracea</italic> varieties by <italic>A. brassicicola</italic>.
- Subjects
COLE crops; CABBAGE; GERMINATION; FUNGAL development; PHYTOPATHOGENIC microorganisms
- Publication
Plant Pathology, 2018, Vol 67, Issue 5, p1088
- ISSN
0032-0862
- Publication type
Article
- DOI
10.1111/ppa.12828