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GENOMICS, MOLECULAR GENETICS & BIOTECHNOLOGY

Quantitative Trait Loci Controlling Fusarium Head Blight Resistance and Low Deoxynivalenol Content in Hexaploid Wheat Population from ‘Arina’ and NK93604

^a Africa Rice Center (WARDA), 01 BP 2031, Cotonou, Benin
^b Dep. of Plant and Environmental Sciences, Norwegian Univ. of Life Sciences, P.O. Box 5003, N-1432, Ås, Norway

^* Corresponding author (helge.skinnes{at}umb.no)

Breeding for Fusarium head blight (FHB) resistant wheat adapted to the Norwegian climatic conditions is one of the top priorities in the country. This study was conducted to characterize QTLs for FHB resistance and low deoxynivalenol (DON) content in a population of 93 double haploid lines from a cross between ‘Arina’ and NK93604. Both parents have moderate levels of resistance to FHB. The population was assessed for FHB resistance under field conditions for 3 yr (2001 to 2003), and DON content was analyzed from seed samples in the 2002 experiment. The two traits showed significant genetic variation and were significantly correlated with each other. Composite interval mapping (CIM) identified four QTLs using the 3 yr mean for FHB resistance on chromosomes 1AL, 1BL, 6BS, and 7AL. The QTLs on 1AL, 1BL, and 7AL were consistently detected in all 3 yr, and explained 27.9, 19.6, and 14.8% of the phenotypic variation, respectively. The QTLs on chromosomes 1BL and 6BS originated from Arina, whereas those on 1AL and 7AL were from NK93604. None of the QTLs for FHB resistance detected in this study were coincident with those previously reported in the Arina/‘Forno’ population. Two major QTLs, both derived from NK93604, on chromosomes 1AL and 2AS were identified for DON content that explained 27.9 and 26.7% of the variation, respectively. A major QTL for FHB resistance on 1AL coincided with a QTL for DON content. As far as we are aware, the QTL on chromosome 1AL is novel and not reported elsewhere. Data from the present study provides breeders with additional information on chromosomal regions associated with FHB resistance and DON content in European wheats and will help guide the development of FHB-resistant wheat.

Abbreviations: AFLP, amplified fragment length polymorphism • ArNK, Arina x NK93604 • CIM, composite interval mapping • cM, centimorgan • d.a.i., days after inoculation • DArT, diversity arrays technology • d.f., degrees of freedom • d°, sum degree Celsius x day • DH, double haploid • DON, deoxynivalenol • FHB, Fusarium head blight • LOD, log of odds • QTL, quantitative trait loci • R², proportion of variance explained by QTL • RFLP, restriction fragment length polymorphism • SSR, simple sequence repeat • CV, cross validation

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