Penetration and infection of spinach (Spinacia oleracea L.) leaf tissues by Cladosporium variabile
DOI:
https://doi.org/10.33885/sf.1996.3.848Keywords:
Cladosporium variabile, Spinacia oleracea, leaf spot, germination, penetration, pinhead rustAbstract
When spinach was inoculated with a 10°/ml conidial suspensión oí Cladosporium variabile and incubated at 16-
26°C with 100% relattve humidity, the percentage of conidia germination was 0.9, 12 h after inoculation,
progressively increasing ío 80.6, 96 h later. The average percentage germination for 1-celled conidia was 29.1, 67,8
for 2-celled, 2.6 for 3-celled, and 0.5 for 4-celled. Penetration, which took place through stomata, was not observed
until 48 h after inoculation. The mean percentage of conidia with germ tubes penetrating leaf íissue was 23 for 1-
celled conidia, 75.1 for 2-celled, and 1.9 for 3-celled. After penetration, vesicle-like structures were produced from
which thíck ¡nfective hyphae developed. These grew Ínter- and intracellularly. Hyphae resembling conidiophores
emerged frorn the infected áreas 96-110 h after inoculation
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