Significant genetic variation among IBLs was observed for root rot ratings in the four greenhouse experiments and in all field tests of the kidney and cranberry IBL populations except in the NYSAES test (Table 1).
Several IBLs resembling the recurrent parents in seed and agronomic traits were identified with root rot resistance superior to both Andean parents.
Narrow-sense heritability ([h.sup.2.sub.N]), parental mean, mean and range of root rot disease evaluations for 91 B[C.sub.2][F.sub.4:5] kidney and 78 B[C.sub.2][F.sub.4:5] cranberry inbred backcross lines (IBLs) evaluated for resistance to Fusarium root rot under greenhouse and field environments in 2002 and 2003.
When using unbalanced populations for mapping and identifying QTL, there is a loss of resolution and efficiency due to the unequal allele frequency inherited in IBL populations (Butruille et al., 1999; Tanksley and Nelson, 1996).
The objectives of this study were to (i) use IBL populations to introgress Fusarium root rot resistance into the large-seeded Andean kidney and cranberry beans using a small-seeded black bean from the Middle American gene pool as the source of resistance; and (ii) identify significant QTL-marker associations which could be used to facilitate indirect selection for Fusarium root rot resistance in common bean.
Two IBL populations, one with 91 IBL individuals from a cross of 'Red Hawk'*2/'Negro San Luis' (NSL) and the other with 78 IBL individuals from a cross of C97407*2/NSL were developed using the inbred backcross procedure similar to the method described by Bliss (1993) in common bean.
Both IBL populations were treated independently and were considered as two separate experiments to reduce error variance.
Resistance of the IBL populations, parents and additional checks of known root rot reaction were evaluated for Fusarium root rot resistance at maturity in 2002 and during flowering in 2003.
The kidney and cranberry IBL populations were evaluated separately in two experiments planted at MRF on 20 June 2002.
Both IBL populations and additional checks of known disease reaction were evaluated for root rot reaction in the greenhouse using a perlite-based protocol (Schneider and Kelly, 2000).
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