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Alternaria blight in Brassica spp (caused by Alternaria brassicae) is characterized by dark brown to blackish necrotic lesions surrounded by chlorotic areas on the leaves. Similar chlorotic lesions were mimicked by a chlorotic toxin (destruxin B) purified from the culture filtrate. Ultrastructural studies were performed to study and compare the changes caused by A. brassicae inoculation in vivo and...