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This study was designed to compare snap and dry beans ( Phaseolus vulgaris  L.) for pod Ca concentration, and to identify genetic resources that might be useful in breeding programs directed to increase Ca concentration in bean pods. Pods from eight snap bean and eight dry bean cultivars were evaluated for Ca concentration during 1995 and 1996 at Hancock, Wis. A randomized complete-block design was utilized with three replications in 1995 and six in 1996. Beans were planted in June and hand-harvested in August for both experiments. Soil Ca at planting time was 580 mg·kg –1  in 1995 and 500 mg·kg –1  in 1996. No additional Ca was added. Plots consisted of 10 plants each. At harvest, a pooled sample of 10 to 15 size no. 4 pods was collected from each plot. Atomic absorption spectrophotometry was used to determine Ca content. Significant differences ( P  ≤ 0.01) were detected among and within bean types (dry and snap). Although bean type × year interaction was nonsignificant, a strong year effect was observed ( P  ≤ 0.01). Snap beans (4.6 ± 0.7 mg·g –1  dry weight) had significantly higher pod Ca concentration than did dry beans (4.2 ± 0.6 mg·g –1  dry weight). Within snap beans, `Checkmate' had the highest pod Ca concentration (5.5 ± 0.3 mg·g –1  dry weight) and `Nelson' the lowest (3.8 ± 0.3 mg·g –1  dry weight). Within dry beans, `GO122' had the highest (5.1 ± 0.4 mg·g –1  dry weight) and `Porrillo 70' the lowest pod Ca concentration (3.6 ± 0.3 mg·g –1  dry weight). Six cultivars had pod Ca concentrations significantly ( P  ≤ 0.01) higher than the overall mean (4.4 ± 0.3 mg·g –1  dry weight).

Differences in Pod Calcium Concentration for Eight Snap Bean and Dry Bean Cultivars