Skip to Main content Skip to Navigation
Journal articles

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

Abstract : We evaluated cassava bacterial blight (CBB) infection in an pair-cross population of 150 individuals derived from an intra-specific cross between two noninbred 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.
Document type :
Journal articles
Complete list of metadata
Contributor : Migration Prodinra Connect in order to contact the contributor
Submitted on : Sunday, May 31, 2020 - 8:37:48 PM
Last modification on : Monday, November 30, 2020 - 6:54:02 AM

Links full text




Véronique Jorge, Martin Fregene, M. Velez, Myriam C. Duque, Joe Tohme, et al.. QTL analysis of field resistance to Xanthomonas axonopodis pv. manihotis in cassava. TAG Theoretical and Applied Genetics, Springer Verlag, 2001, 102 (4), pp.564-571. ⟨10.1007/s001220051683⟩. ⟨hal-02678591⟩



Record views