Developmental Morphology and Life Cycles of the Microsporidia
2014; Linguagem: Inglês
10.1128/9781555818227.ch3
Autores Tópico(s)Plant Disease Resistance and Genetics
ResumoThis chapter reviews the morphological features and development of the microsporidia. The general life cycle pattern of the microsporidia can be divided into three phases: the infective or environmental phase, the proliferative phase, and the sporogony or spore forming phase. The chapter discusses the host-parasite interface during parasite development. Microsporidia with host-produced interfacial envelopes are those that are separated from the hyaloplasm by host-produced membranes during proliferation through spore formation. Microsporidia having indirect contact between host- and parasite-produced interfacial envelopes are separated from the hyaloplasm by membranes and/or secretions produced by both the host and the parasite. The proliferative phase has been referred to as schizogonic and merogonic by some authors, however, different authors have assigned different types of nuclear activity to the terms merogony and schizogony with respect to the microsporidia. Recognizing the diversity of polaroplast morphology and organization in various species of microsporidia, Larsson described five types of polaroplast structural arrangements. In addition to environmental spores, some microsporidia produce autoinfective spores which become activated and germinate within the same host in which they were just produced. A few microsporidia of the genus Amblyospora have two host cycles with morphologically different spores in each and different development in the males and females of the same host species.
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