PHYTOPHTHORA MEGASPERMA F. SP. MEDICAGINIS IN CENTRAL MEXICO: DISTRIBUTION, PATHOGENICITY AND RESISTANCE IN ALFALFA

Persistent Link:
http://hdl.handle.net/10150/281975
Title:
PHYTOPHTHORA MEGASPERMA F. SP. MEDICAGINIS IN CENTRAL MEXICO: DISTRIBUTION, PATHOGENICITY AND RESISTANCE IN ALFALFA
Author:
Aguirre Rascon, Jaime
Issue Date:
1981
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
Forage production and longevity of alfalfa (Medicago sativa L.) are reduced by the effect of the fungus Phytophthora megasperma Drechs. in irrigated alfalfa fields located in Central Mexico. There are no resistant alfalfa cultivars adapted to this region. Phytophthora root rot was found in irrigated fields at elevations between 1600 to 2000 m. Strains of this fungus isolated from soil collected in Mexico were more virulent than one strain from Arizona. Four alfalfa cultivars of Mexican origin, Certified Hayden, and Hayden PX-III, an experimental cultivar resistant to strains of P. megasperma from Arizona, were susceptible to P. megasperma Bajio strain collected in Central Mexico. Following two cycles of phenotypic current selection, the level of resistance to Phytophthora root rot was increased from 5.6% to 22.8% in the new population originating from the cultivar INIA-76, and from 12.8% to 30.6% in the new population originating from the cultivar Hayden PX-III.
Type:
text; Dissertation-Reproduction (electronic)
Keywords:
Phytophthora.; Alfalfa -- Disease and pest resistance -- Mexico.; Alfalfa -- Diseases and pests.; Root rots.
Degree Name:
Ph.D.
Degree Level:
doctoral
Degree Program:
Graduate College; Plant Sciences
Degree Grantor:
University of Arizona
Advisor:
Schonhorst, M. H.

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titlePHYTOPHTHORA MEGASPERMA F. SP. MEDICAGINIS IN CENTRAL MEXICO: DISTRIBUTION, PATHOGENICITY AND RESISTANCE IN ALFALFAen_US
dc.creatorAguirre Rascon, Jaimeen_US
dc.contributor.authorAguirre Rascon, Jaimeen_US
dc.date.issued1981en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractForage production and longevity of alfalfa (Medicago sativa L.) are reduced by the effect of the fungus Phytophthora megasperma Drechs. in irrigated alfalfa fields located in Central Mexico. There are no resistant alfalfa cultivars adapted to this region. Phytophthora root rot was found in irrigated fields at elevations between 1600 to 2000 m. Strains of this fungus isolated from soil collected in Mexico were more virulent than one strain from Arizona. Four alfalfa cultivars of Mexican origin, Certified Hayden, and Hayden PX-III, an experimental cultivar resistant to strains of P. megasperma from Arizona, were susceptible to P. megasperma Bajio strain collected in Central Mexico. Following two cycles of phenotypic current selection, the level of resistance to Phytophthora root rot was increased from 5.6% to 22.8% in the new population originating from the cultivar INIA-76, and from 12.8% to 30.6% in the new population originating from the cultivar Hayden PX-III.en_US
dc.typetexten_US
dc.typeDissertation-Reproduction (electronic)en_US
dc.subjectPhytophthora.en_US
dc.subjectAlfalfa -- Disease and pest resistance -- Mexico.en_US
dc.subjectAlfalfa -- Diseases and pests.en_US
dc.subjectRoot rots.en_US
thesis.degree.namePh.D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.disciplinePlant Sciencesen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorSchonhorst, M. H.en_US
dc.identifier.proquest8118452en_US
dc.identifier.oclc8697915en_US
dc.identifier.bibrecord.b13910371en_US
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