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dc.contributor.advisorVargas, María M.
dc.contributor.authorValentín-Torres, Suheidy.
dc.date.accessioned2018-08-09T14:18:41Z
dc.date.available2018-08-09T14:18:41Z
dc.date.issued2010
dc.identifier.urihttps://hdl.handle.net/20.500.11801/772
dc.description.abstractRhizoctonia solani is a widespread soilborne pathogen of common bean (Phaseolus vulgaris L.). This major pathogen is a species complex classified in 14 anastomosis groups (AG). Some AGs can cause web blight (WB), one of the most important diseases of bean plants planted in the Caribbean, while others are responsible for root rots (RR). Knowledge of these subgroups and their interactions with plant hosts represents an essential contribution to the mycological and plant breeding communities. For this reason the variability of web blight and root rot isolates were compared by detecting differential reactions among bean lines using a detached leaf method in leaf evaluations and a mycelia suspension technique in root evaluations. Disease severity evaluations demonstrated that line PR0401-259 was resistant to WB and line PR0650-27 expressed moderate levels of RR resistance. The most aggressive WB isolate was AG 4WB2 and the most severe RR isolate was AG 4RR1.
dc.description.abstractRhizoctonia solani es un patógeno, con distribución mundial, de habichuela común (Phaseolus vulgaris L.). Es un complejo de especies clasificado en 14 grupos de anastomosis (GA). Algunos GA causan mustia hilachosa (MH), una de las enfermedades más importantes de habichuelas sembradas en el caribe, mientras que otros causan pudrición de raíz (PR). El conocimiento de estos subgrupos y sus interacciones con plantas hospederas representa una contribución esencial para comunidades micológicas y de fitomejoración. Por tal razón se comparó la variabilidad de aislados de MH y de PR utilizando un método de hoja desprendida para evaluar hojas y una técnica de suspensión micelial para evaluar raíces. Evaluaciones de severidad de enfermedad demostraron que la línea PR0401-259 fue resistente a MH y la línea PR0650-27 tuvo niveles moderados de resistencia a PR. El aislado más agresivo de MH fue GA 4WB2 y el aislado más severo de PR fue AG 4RR1.
dc.description.sponsorshipUSDA Tropical Agriculture Research Stationen_US
dc.language.isoenen_US
dc.subjectRhizoctonia solani Kühnen_US
dc.subjectPhaseolus vulgaris Len_US
dc.subjectBean plantsen_US
dc.subjectThanatephorus cucumeris (Frank) Donken_US
dc.subject.lcshRhizoctonia solaris--Puerto Rico--Isabelaen_US
dc.subject.lcshRoot rots--Puerto Rico--Isabelaen_US
dc.subject.lcshMycological surveys--Puerto Rico--Isabelaen_US
dc.subject.lcshCommon bean blight--Puerto Rico--Isabelaen_US
dc.subject.lcshCommon bean--Breeding--Puerto Rico--Isabelaen_US
dc.subject.lcshCommon bean--Diseases--Puerto Rico--Isabelaen_US
dc.subject.lcshCommon bean--Biological control--Puerto Rico--Isabelaen_US
dc.titleIts-5.8S-rDNA region and disease severity comparison of Rhizoctonia solani Anastomosis groups isolated from common bean (Phaseolus vulgaris L.) at Isabela, Puerto Ricoen_US
dc.typeThesisen_US
dc.rights.licenseAll rights reserveden_US
dc.rights.holder(c) 2010 Suheidy Valentín Torresen_US
dc.contributor.committeeBeaver, James S.
dc.contributor.committeeVarela, Felicita
dc.contributor.committeeSiritunga, Dimuth
dc.contributor.representativeAponte, Nilda
thesis.degree.levelM.S.en_US
thesis.degree.disciplineBiologyen_US
dc.contributor.collegeCollege of Arts and Sciences - Sciencesen_US
dc.contributor.departmentDepartment of Biologyen_US
dc.description.graduationYear2010en_US


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