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

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Title QTL analysis of field resistance to Xanthomonas axonopodis pv. manihotis in cassava
 
Creator Jorge, V.
Fregene, Martin A.
Velez, C.M.
Duque E., Myriam Cristina
Tohme, Joseph M.
Verdier, Valerie M.
 
Subject manihot esculenta
xanthomonas
disease resistance
genetic markers
field resistance
quantitative trait loci
bacterial blight
marker-assisted selection
resistencia a la enfermedad
marcadores genéticos
 
Description We 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.
 
Date 2001-03
2014-10-02T08:33:03Z
2014-10-02T08:33:03Z
 
Type Journal Article
 
Identifier 1432-2242
https://hdl.handle.net/10568/43988
https://doi.org/10.1007/s001220051683
 
Language en
 
Rights Copyrighted; all rights reserved
Limited Access
 
Publisher Springer Science and Business Media LLC
 
Source Theoretical and Applied Genetics