Development of chickpea near-isogenic lines for Fusarium wilt.

TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik
P CastroJ Rubio

Abstract

Four pairs of near-isogenic lines (NILs) of chickpea with resistance/susceptibility to Fusarium oxysporum f. sp. ciceris (Foc) have been developed in this study. These lines were produced by searching in advanced recombinant inbred lines (RILs) that are segregating for Foc race 5 based on a phenotypic screening. The sequence tagged microsatellite (STMS) marker TA59, closely linked to wilt resistance genes on linkage group 2 (LG2) of the chickpea map, was used to assist the selection of resistant or susceptible genotypes. The NILs were also characterized for disease reaction to Foc races 1A, 2, 3 and 4. Resistance, susceptibility and slow wilting reactions were found in these NILs. Our results suggest that more than one gene controls the resistance to race 5. Combination of the major gene foc-5 linked to TA59 with other gene/s appears to be required to complete resistance, and the absence of these unknown genes leads to slow wilting reactions. The independent differential responses to races 2 and 3 observed in three NILs could be explained as recombination events. This result suggests that foc-2 and foc-3 are delimiting points at opposite ends of a genomic region that includes the remaining foc genes and the TA59 marker. This se...Continue Reading

References

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