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PLANT GENETIC RESOURCES

Reaction to Three Races of Fusarium Wilt in the Phaseolus vulgaris Core Collection

^a Dep. of Soil and Crop Sciences, Colorado State Univ., Fort Collins, CO 80523
^b Dep. of Bioagric. Sciences and Pest Management, Colorado State Univ., Fort Collins, CO 80523

^* Corresponding author (Mark.Brick{at}colostate.edu)

Seven races of Fusarium oxysporum f. sp. phaseoli Kendrick and Snyder (Fop) cause Fusarium wilt (FW) disease of common bean (Phaseolus vulgaris L.). FW occurs worldwide and has recently become a serious disease in the central and western USA. The objectives of this research were to identify new sources of resistance to Fop, characterize the Central/South American (CA/SA) Phaseolus Core Collection for reaction to races 1, 4, and 5 Fop and determine if a previously reported sequence characterized amplified region (SCAR) molecular marker would be useful to identify resistance among accessions that make up the CA/SA Core Collection. Seedlings from the CA/SA Core Collection were screened for reaction by a root dip inoculation procedure. Among accessions evaluated for reaction to race 1 Fop, 21 were resistant, 47 intermediate, and 126 susceptible. Fifteen accessions were resistant to race 4, 61 intermediate, and 114 were susceptible. Nine accessions were resistant to both races 1 and 4, and five of the nine (PI 207373, PI 307802, PI 308908, PI 309877, PI 310842) were also resistant to race 5 Fop. All accessions resistant to races 1, 4, and 5 of Fop were characterized as Middle American, which suggests that resistance to multiple races of Fop should be more prevalent in germplasm from Middle America. The SCAR marker previously developed to identify a quantitative trait locus (QTL) associated with resistance to Fop was not associated with resistance in the Core Collection.

Abbreviations: ASI, average severity index • CA/SA, Central/South American • Fop, Fusarium oxysporum f. sp. phaseoli • FW, Fusarium wilt disease • PCR, polymerase chain reaction • PPD, photoperiod sensitive • RAPD, random amplified polymorphic DNA • SCAR, sequence characterized amplified region

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