Observation of Flagellate Protozoa (Phytomonas sp.) in Cocos nucifera, Cecropia palmata and Euphorbia hirta

The early stages of the interaction between flowers of the cut rose cv. Sonia and Botrytis c&erea was investigated by scanning electron microscopy and light microscopy. Infection of petals by conidial germ tubes evoked a susceptible reaction. In contrast to general findings nutrient addition to the inoculum was not a prerequisite for this phenomenon. At the lower side of germ tube tips the cuticle was penetrated by infection pegs. Already at this early stage of the infection process, the infection sites were macroscopically visible as scattered white spots. After penetration, pegs enlarged to form infection hyphae, which invaded the periclinal wall of outer epidermal cells. At those sites, the petals formed outgrowths of variable appearance at their abaxial side. These outgrowths consisted of remnants of collapsed epidermal cells and of infection hyphae. Subsequent intra-and intercellular growth of hyphae led to a collapse of epidermal and mesophyll cells. The symptoms described generally developed within 24 h. After subsequent incubation the lesions became necrotic. Eventually, the necrosis would spread leading to the death of whole petals.

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Trypanosomatids of Plants

Wallace¹,

Roitman²,

Camargo³

1992

Parasitic Protozoa

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Observation of Flagellate Protozoa (Phytomonas sp.) in Cocos nucifera, Cecropia palmata and Euphorbia hirta

Cited by 4 publications

References 9 publications

Vectors of Plant Parasites of the Genus Phytomonas (Protozoa, Zoomastigophorea, Kinetoplastida)

Vectors of Plant Parasites of the Genus Phytomonas (Protozoa, Zoomastigophorea, Kinetoplastida)

Histopathology of the initial stages of the interaction between rose flowers and Botrytis cinerea

Trypanosomatids of Plants

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