Resistance to Multiple Races of Fusarium Wilt in Common Bean

摘要

Fusarium wilt of dry bean caused by Fusarium oxysporum Schl.:Fr.f.sp.phaseoli Kendrick & Snyder (Fop) causes rapid yellowing of foliage, defoliation, and can ultimately cause severe yield loss. Woo et al. (7) characterized five races of Fop based uponRAPDs, RFLPs and vegetative compatibility groups, Ribeiro and Hagedorn (3) reported that resistance in Andean germplasm was controlled by one or two major genes, depending on race, while Cross et al. (1) and Fall et al. (2) reported both mono- and polygenic forms of inheritance in Middle American germplasm. Most sources of resistance show resistance to one or two races of Fop, however, broader forms of resistance are needed to protect against multiple races of the pathogen. The objectives of this research were to determine and compare the genetic control of resistance to Fop that controls races 1, 4, and 5 found in LEF-2RB, and resistance to race 4 found in the cultivar Sierra.