EXPLORING COMMON BEAN ROOT RESPONSE TO FUSARIUM ROOT ROT IN A MIDDLE AMERICAN X ANDEAN POPULATION

摘要

Middle American genotypes tend to have shorter taproots, fewer basal roots, but more adventitious roots than the Andean counterparts'. Root architecture has been used in many species, including dry beans, for ideotype based breeding2. There may also be a root ideotype that supports resilience to root rots. There has been ample evidence over the last 20 years that indicates root architecture may influence root rot in multiple legume species with various root pathogens. This includes co-localization ofloci regulating root traits and root rot resistance or strong negative correlations between root rot scores and root traits3"6. We had previously screened an Andean by Middle American recombinant inbred line (RIL) population for FRR resistance7. Susceptible lines were leggy and less robust than their resistant counterparts. A QTL for root biomass and FRR resistance co-localized on chromosome two. For these reasons, this population is a reliable resource for studying the influence of root architecture on FRR resistance.