**4.3. Genetics of resistance to** *Fusarium solani* **f. sp.** *phaseoli* **in common bean cv. BAT 477**

Genetic analysis identified one QTL significantly associated with resistance to FSP in BAT 477 growing under controlled conditions. This QTL explained 2.7% of variation in response to the disease and the marker was found at LG 5 [16]. Identification of few QTLs with high effects on explanation of phenotypic variation is important and promising to simplify the introgression of resistance genes to susceptible germplasm. However, our results indicated a low genetic effect of the QTL detected in BAT 477. Therefore, a more intensive searching of significant QTLs is needed. Genetic map development allows identification and use of genes and genomic regions (QTLs) with economic interest and then develops markerassisted selection (MAS) strategies [25]. Vallejos et al. [26] performed the first gene map of common beans using morphologic, isozymes and RFLP markers. Then, Schneider et al. [27] identified 16 QTLs associated with *F. solani* f. sp. *phaseoli* resistance in F4:6 RILs derived from Montcalm (susceptible) x FR266 (resistant). These QTLs were mainly found on LGs 2 and 5, and seven QTLs explained 64% of disease resistance. Chowdhury et al. [28] identified two QTLs associated with FSP resistance and explaining 50% of phenotypic variance using F2:6 RILs from AC Compass (susceptible) × NY2114–12 (resistant), while Román-Avilés et al. [29] identified nine QTLs associated with resistance to FSP in F4:5 inbred backcross populations from Red Hawk (susceptible) × NG San Luis (Resistant) and C97407 (susceptible) × NG San Luis, which explained from 5 to 53% of phenotype variation and located mainly at LGs 1 and 7.

**Author details**

José Saul Padilla-Ramírez1

Francisco J. Ibarra-Pérez1

José Luis Chávez-Servia3

Ciudad de México, Mexico

México

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