Study of the involvement of Mycosphaerella fijiensis Morelet toxins in the mechanisms of partial resistance of banana to Black Leaf Streak disease | Etude de l'implication des toxines de Mycosphaerella fijiensis Morelet dans les mecanismes de resistance partielle des bananiers a la cercosporiose noire du bananier
1997
Harelimana, G.
A set of bioassays (based on the electrolyte leakage and the measurement of the chlorophyll fluorescence) was developed to quantify stress effects of metabolites extracted from culture filtrates (= ethyl acetate crude extract or EaCE) of Mycosphaerella fijiensis, the causal agent of banana Black Leaf Streak (BLS) disease. We evaluated the sensitivity of different cultivars of banana to EaCE, either susceptible genotypes (Grande Name, Pisang glintong), or partially resistant (Fougamou and Pisang berlin), or a highly resistant genotype exhibiting an early hypersensitive-like reaction (Yangambi Km5) to BLS. The results suggest that slow lesion development would be associated with lower sensitivity to M. fijiensis toxins, while the hypersensitive-like reaction observed in Yangambi Km5 is not linked to the action of these toxin(s). The hypothesis of the involvement of the photosynthetic apparatus in the action of EaCE is based on the observation of chloroplasts swelling, the first abnormality observed in the toxin-treated leaves of Grande Name using electron microscopy, and on the observation of the effect of light on the EaCE toxicity whatever the bioassay performed
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