QTL analysis of field resistance to Xanthomonas axonopodis pv. manihotis in cassava

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dc.creatorJorge, V.
dc.creatorFregene, Martin A.
dc.creatorVelez, C.M.
dc.creatorDuque E., Myriam Cristina
dc.creatorTohme, Joseph M.
dc.creatorVerdier, Valerie M.
dc.date2001-03
dc.date2014-10-02T08:33:03Z
dc.date2014-10-02T08:33:03Z
dc.date.accessioned2026-06-27T14:45:54Z
dc.descriptionWe evaluated cassava bacterial blight (CBB) infection in an pair-cross population of 150 individuals derived from an intra-specific cross between two non-inbred cassava (Manihot esculenta Crantz) lines. The replicated trials were carried out in the field under high disease pressure over two consecutive crop cycles. Evaluations were conducted at 4 and 7 months after planting for the two cycles. Simple regression analysis and the nonparametric Kruskal-Wallis rank-sum test revealed that eight quantitative trait loci (QTLs) were involved in resistance. We detected changes in QTLs from crop cycle to crop cycle. The pathogen population (Xanthomonas axonopodis pv. manihotis) was also monitored over the period, using a restriction fragment length polymorphism probe and pathogenic tests. Changes in QTL detection over the 2 years could be correlated with changes in pathogen population structure. One QTL, located in linkage group D, was conserved over the two crop cycles, and in field to greenhouse evaluations. This study thus identified molecular markers useful for marker assisted-selection, a technique that can accelerate the long, multiple-season process of breeding for CBB resistance.
dc.identifierhttps://hdl.handle.net/10568/43988
dc.identifier.urihttp://hdl.handle.net/123456789/87803
dc.languageen
dc.publisherSpringer
dc.rightsLimited Access
dc.subjectmanihot esculenta
dc.subjectxanthomonas
dc.subjectdisease resistance
dc.subjectgenetic markers
dc.subjectfield resistance
dc.subjectquantitative trait loci
dc.subjectbacterial blight
dc.subjectmarker-assisted selection
dc.subjectresistencia a la enfermedad
dc.subjectmarcadores genéticos
dc.titleQTL analysis of field resistance to Xanthomonas axonopodis pv. manihotis in cassava
dc.typeJournal Article

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Centro Internacional de Agricultura Tropical (CIAT)