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dc.contributor.authorKong, P.en
dc.contributor.authorHong, C.en
dc.date.accessioned2016-12-19T16:03:18Zen
dc.date.available2016-12-19T16:03:18Zen
dc.date.issued2014-05-13en
dc.identifier.citationBMC Microbiology. 2014 May 13;14(1):124en
dc.identifier.issn1471-2180en
dc.identifier.urihttp://hdl.handle.net/10919/73719en
dc.description.abstractBackground The genus Phytophthora includes a group of agriculturally important pathogens and they are commonly regarded as water molds. They produce motile zoospores that can move via water currents and on their own locomotion in aquatic environments. However, zoosporic response to dissolved oxygen, an important water quality parameter, is not known. Like other water quality parameters, dissolved oxygen concentration in irrigation reservoirs fluctuates dramatically over time. The aim of this study was to determine whether and how zoospore survival may be affected by elevated and low concentrations of dissolved oxygen in water to better understand the aquatic biology of these pathogens in irrigation reservoirs. Results Zoospores of P. megasperma, P. nicotianae, P. pini and P. tropicalis were assessed for survival in 10% Hoagland’s solution at a range of dissolved concentrations from 0.9 to 20.1-mg-L-1 for up to seven exposure times from 0 to 72-h. Zoospore survival was measured by resultant colony counts per ml. Zoospores of these species survived the best in control Hoagland’s solution at dissolved oxygen concentrations of 5.3 to 5.6-mg-L-1. Zoospore survival rates decreased with increasing and decreasing concentration of dissolved oxygen, depending upon Phytophthora species and exposure time. Overall, P. megasperma and P. pini are less sensitive than P. nicotianae and P. tropicalis to hyperoxia and hypoxia conditions. Conclusion Zoospores in the control solution declined over time and this natural decline process was enhanced under hyperoxia and hypoxia conditions. These findings suggest that dramatic fluctuations of dissolved oxygen in irrigation reservoirs contribute to the population decline of Phytophthora species along the water path in the same reservoirs. These findings advanced our understanding of the aquatic ecology of these pathogens in irrigation reservoirs. They also provided a basis for pathogen risk mitigation by prolonging the turnover time of runoff water in recycling irrigation systems via better system designs.en
dc.format.extent? - ? (8) page(s)en
dc.format.mimetypeapplication/pdfen
dc.languageEnglishen
dc.publisherBiomed Central Ltden
dc.relation.urihttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000336179300001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=930d57c9ac61a043676db62af60056c1en
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectMicrobiologyen
dc.subjectMICROBIOLOGYen
dc.subjectPhytophthora speciesen
dc.subjectAquatic ecologyen
dc.subjectZoospore survivalen
dc.subjectDissolved oxygenen
dc.subjectCARBON DIOXIDE TENSIONSen
dc.subjectIRRIGATION WATERen
dc.subjectGROWTHen
dc.subjectFUNGIen
dc.subjectPYTHIUMen
dc.subjectNICOTIANAEen
dc.subjectCINNAMOMIen
dc.subjectBACTERIAen
dc.subjectRAMORUMen
dc.subjectMOLDSen
dc.titleOxygen stress reduces zoospore survival of Phytophthora species in a simulated aquatic systemen
dc.typeArticle - Refereeden
dc.description.versionPublished versionen
dc.rights.holderPing Kong et al.; licensee BioMed Central Ltd.en
dc.contributor.departmentVirginia Cooperative Extension (VCE)en
dc.contributor.departmentVirginia Agricultural Experiment Stationen
dc.title.serialBMC MICROBIOLOGYen
dc.identifier.doihttps://doi.org/10.1186/1471-2180-14-124en
dc.identifier.volume14en
dc.type.dcmitypeTexten
pubs.organisational-group/Virginia Techen
pubs.organisational-group/Virginia Tech/Agriculture & Life Sciencesen
pubs.organisational-group/Virginia Tech/Agriculture & Life Sciences/CALS T&R Facultyen
pubs.organisational-group/Virginia Tech/Agriculture & Life Sciences/Hampton Roads ARECen
pubs.organisational-group/Virginia Tech/All T&R Facultyen


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Creative Commons Attribution 4.0 International
License: Creative Commons Attribution 4.0 International