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Revista Brasileira de Fruticultura

Print version ISSN 0100-2945

Abstract

MORAES, Sylvia Raquel Gomes; TANAKA, Francisco André Osama  and  MASSOLA JUNIOR, Nelson Sidnei. Histopathology of Colletotrichum gloeosporioides on guava fruits (Psidium guajava L.). Rev. Bras. Frutic. [online]. 2013, vol.35, n.2, pp.657-664. ISSN 0100-2945.  http://dx.doi.org/10.1590/S0100-29452013000200039.

Anthracnose, caused by Colletotrichum gloeosporioides, produces brown lesions on guava fruits, causing severe losses on postharvest. In this study, the infection and colonization of guava fruits by C. gloeosporioides has been examined using scanning and transmission electron microscopy. Fruits at the physiologically mature stage were inoculated with a 105 conidia/mL spore suspension. Afterward, fruits were incubated at 25 °C in a wet chamber for periods of 6, 12, 24, 48, 96 and 120 h to allow examination of the infection and colonization process. Conidia germination and appressoria formation occurred six hours after inoculation (h.a.i). Penetration occurred directly via penetration pegs from appressoria, which penetrated the host cuticle 48 h.a.i. Notably, the appressoria did not produce an appressorial cone surrounding the penetration pore. Infection vesicles were found in epidermal cells 96 h.a.i. The same fungal structures were found in epidermal and parenchymal cells of the host 120 h.a.i. Colonization strategy of C. gloeosporioides on guava fruit was intracellular hemibiotrophic.

Keywords : colonization; penetration; pre-penetration; ultrastructure.

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