ABSTRACTAn ontogenetic study of the stem pitting was carried out, using as a model system the peduncle of flowers and fruits of sweet orange cv. Pêra infected by a very severe isolate, Capão Bonito, of Citrus tristeza virus (CTV). Anatomical and ultrastructural analysis revealed five phases of this process. It starts with the localized appearance of ch roma tic cells i n th e p hloem pa ren chym a, h ypertrophy of companion and cambial cells and overall disorganization of the phloem and deposition of a dense … Show more
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