Bipolaris zeicola: physiological races, morphology and resistance on maize

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dc.contributor.authorTraut, Eduardo Jorgeen
dc.contributor.committeechairWarren, Herman L.en
dc.contributor.committeememberEisenback, Jonathan D.en
dc.contributor.committeememberGrayson, Randolph L.en
dc.contributor.committeememberMaroof, M.A. Saghaien
dc.contributor.committeememberStipes, R. Jayen
dc.contributor.departmentPlant Pathologyen
dc.date.accessioned2014-03-14T21:23:32Zen
dc.date.adate2005-12-22en
dc.date.available2014-03-14T21:23:32Zen
dc.date.issued1993en
dc.date.rdate2005-12-22en
dc.date.sdate2005-12-22en
dc.description.abstractConidial length, width, septation, curvature and pigmentation of 39 isolates of Bipolaris zeicola (Stout) Shoemaker from different geographical areas and representing distinct physiological races were examined. Wide variability in conidial morphology was found among isolates of each race. No association was found between races or groups of isolates producing the same shape of lesions and conidial morphology. Morphology and expansion of lesions induced by three races of B. zeicola producing different shapes of lesion on susceptible maize (Zea mays L.) inbred lines were studied. Resistant type lesions induced by three races of B. zeicola were indistinguishable based on their shape or size. However, lesion size correlated with the lesion type induced by each race, indicating that it may be useful to evaluate resistance to different races of B. zeicola. Inheritance of reaction to one isolate of the proposed pathotype of B. zeicola was studied. Resistance was controlled by a single dominant gene in the cross Pr x B37. Forty-nine isolates of B. zeicola from different geographical areas including all the previously described races and pathotype were characterized by their disease reaction, severity and symptoms incited on 14 maize inbred lines. Eleven physiological races were distinguished based on their differential reaction on the 14 inbred lines; however, 6 inbred lines were adequate to differentiate the races. A system based on binary notation is proposed to designate races of B. zeicola on maize. Two races induced typical symptoms of Helminthosporium carbonum-toxin (HC-toxin) production on Pr. Seven races produced oval to irregular lesions on susceptible hosts and did not produce typical lesions of HC-toxin production on Pr. One race induced predominantly long, linear lesions, and another was avirulent on all 14 maize inbred lines.en
dc.description.degreePh. D.en
dc.format.extentx, 106 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-12222005-090635en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-12222005-090635/en
dc.identifier.urihttp://hdl.handle.net/10919/40449en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V856_1993.T695.pdfen
dc.relation.isformatofOCLC# 29895187en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V856 1993.T695en
dc.subject.lcshBipolaris zeicolaen
dc.subject.lcshCorn -- Diseases and pestsen
dc.titleBipolaris zeicola: physiological races, morphology and resistance on maizeen
dc.typeDissertationen
dc.type.dcmitypeTexten
thesis.degree.disciplinePlant Pathologyen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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