| Effects prior vegetative growth, inoculum density, light, and mating on conidiation of Erysiphe necator. | |
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MedLine Citation:
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PMID: 21848394 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Initiation of asexual sporulation in powdery mildews is preceded by a period of superficial vegetative growth of mildew colonies. We found evidence of a quorum sensing signal in Erysiphe necator that was promulgated at the colony center and stimulated conidiation throughout the colony. Removal of the colony center after putative signal promulgation had no impact upon timing of sporulation by 48-¬h-¬old hyphae at the colony margin. However, removal of the colony center before signaling nearly doubled the latent period. A relationship between inoculum density and latent period was also observed, with latent period decreasing as the number of conidia deposited per mm2 was increased. The effect was most pronounced at the lowest inoculum densities, with little decrease of the latent period as the density of inoculation increased above 10 spores/mm2. Light was furthermore shown to be necessary to initiate conidiation of sporulation-competent colonies. When plants were inoculated and maintained in a day/night cycle for 36 h, but subjected to darkness after 36 hours, colonies kept in darkness failed to sporulate for several days after plants kept in light had sporulated. Once returned to light, the dark-suppression was immediately reversed, and sporulation commenced within 12 h. Merging of colonies of compatible mating types resulted in near-cessation of sporulation, both in the region of merging, and in more distant parts of the colonies. Colonies continued to expand but stopped producing new conidiophores once pairing of compatible mating types had occurred, and extant conidiophores stopped producing new conidia. Therefore, in addition to a quorum sensing signal to initiate conidiation, there appears to be either signal repression or another signal that causes conidiation to cease once pairing has occurred and the pathogen has initiated the ascigerous stage for overwintering. |
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Authors:
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David Gadoury; Laura M Wakefield; Lance Cadle-Davidson; Ian Dry; Robert C Seem |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-8-17 |
Journal Detail:
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Title: Phytopathology Volume: - ISSN: 0031-949X ISO Abbreviation: - Publication Date: 2011 Aug |
Date Detail:
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Created Date: 2011-8-18 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9427222 Medline TA: Phytopathology Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Cornell University, NYSAES, Plant Pathology, 630 W. North St, Geneva, New York, United States, 14456, 315 787 2614, 315 787 2389; dmg4@cornell.edu. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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