Helical Filaments Produced by a Mycoplasma-Like Organism Associated with Corn Stunt Disease
1972; American Association for the Advancement of Science; Volume: 176; Issue: 4034 Linguagem: Inglês
10.1126/science.176.4034.521
ISSN1095-9203
AutoresRobert E. Davis, Joseph F. Worley, Robert F. Whitcomb, Takashi Ishijima, Russell L. Steere,
Tópico(s)Plant Disease Resistance and Genetics
ResumoMycoplasma-like bodies with helical filaments were seen by phase contrast microscopy in juice expressed from tissues of plants infected with corn stunt agent. Each filament is bounded by a "unit membrane" and no cell wall, sheath, envelope, or second membrane has yet been discerned by electron microscopy. The association of these filaments with development of disease, their occurrence in phloem cells as seen by both freeze-etching and thin-section electron microscopy, the diagnosis of infection based on their presence in plants without symptoms, and their absence in noninfected corn are consistent with the hypothesis that these unusual filaments are formed by the mycoplasma-like organism presumed to be the corn stunt agent.
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