Evaluation of parents and advanced breeding lines of bush type snap bean

Abstract

Ninety-five snap bean (Phaseolus vulgaris L.) breeding lines from five parents crossed in a diallel mating design were studied. The parental cultivars were Green Isle (GI). Tempo (T), Bush Blue Lake 274 (BBL). Gala Green (GG) and Cascade (CAS). The parental evaluation was based on progeny performance GI was the best parent for number of lines which exceeded the best parent mean in number of pods per plant. BBL was the best parent for pod weight per plant, individual pod weight, pod length and number of lines exceeding the best parent. Cascade progenies showed the largest variability for pod weight per plant, while GG ranked first based on total number of standard deviations units over the mid parent for this trait. Tempo had the lowest incidence of interlocutar cavitation based on parental mean, progeny mean, number of lines that exceeded the best parent, number of deviations over mid parents and aIso the best progenies for ovule number per pod. Thirteen lines exceeded the best parent yield in gram per plant (g/pl) in at least 10%. Line l from GG x CAS showed the best yield exceeding the best parent by 40%.