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Genetics and breeding for resistance to common blight, web blight, and rust diseases in dry beans (Phaseolus vulgaris L.)
Abstract
Common blight (CB), caused by Xanthomonas campestris pv. phaseoli (Xcp); web blight, incited by Thanatephorous cucumeris (Tc); and rust, caused by Uromyces appendiculatus (Ua) are major constraints to bean yield and seed quality. Experiments were conducted to identify germplasm resistant to Xcp and Ua. In another study the inheritance and heritabilities of seed infection, leaf and pod reactions to Xcp, leaf reaction to Tc, plant architecture, and their associations were determined in dry bean crosses. Significant germplasm x Xcp strain interactions occurred for the leaf and pod reactions of 18 dry bean accessions tested with four Xcp strains in the greenhouse at UNL, NE. Positive correlations were found for leaf and pod reaction to Xcp strains. Significant germplasm (18 accessions) x Ua race (7) interactions were also detected. IAPAR-14 and BAC-6 (Brazil) lines had the best combined resistance to both pathogens. The reaction to Xcp was quantitatively inherited. Heritability values of.07,.11,.46,.11,.36,.53,.34, and.27 for leaf reaction;.10,.10,.13, and.27 for pod reaction; and.44,.26,.36, and.53 for seed infection were estimated for F$\sb6$ and F$\sb3$BC$\sb2$ lines derived from the crosses 'PC-50' x XAN-159, 'PC-50' x BAC-6, and 'Venezuela 44' x BAC-6 (greenhouse, UNL, NE). No significant correlations were detected between leaf and pod reactions or between leaf reaction, pod reaction, and Xcp seed infection. Quantitative inheritance was observed for leaf reaction to Xcp and Tc, plant uprightness (PU), pod distribution (PD), and branch density (BD) in F$\sb6$ lines from the cross BAC-6 x HT7719 and its reciprocal in field studies at San Juan de la Maguana, Dominican Republic. Heritability values of.13 (CB),.14 and.27 (WB),.30 and.44 (PU),.18 and.17 (PD), and.21 and.23 (BD) were estimated. No significant correlations were detected between CB and WB or between either CB or WB with any of the architectural traits except for low correlations between WB and PU (= +0.22, +0.28). A low correlation (+0.27) was observed between PU with BD but not with PU and PD.
Subject Area
Plant pathology|Agronomy
Recommended Citation
Arnaud-Santana, Eladio, "Genetics and breeding for resistance to common blight, web blight, and rust diseases in dry beans (Phaseolus vulgaris L.)" (1992). ETD collection for University of Nebraska-Lincoln. AAI9225459.
https://digitalcommons.unl.edu/dissertations/AAI9225459