Physical characterization of new advanced drought tolerant common bean ( phaseolus vulgaris) lines for canning quality

Abstract

The suitability for use in the canning industry of eight new dry bean varieties, selected from 150 new advanced drought tolerant dry bean lines was studied. Physical attributes including seed size, dimensions, hundred seed mass, bulk density, water uptake, volume increase and leaching characteristics on soaking were evaluated. There were significant differences (p<0.05) in seed dimensions, hundred seed mass and bulk density. DSS 11-04 (14.67 mm), DRM 11-14 (13.32 mm) and DPC 11-05 (12.84 mm) were highest in seed length. There were significant differences (p<0.05) in maximum soaking rate (Vmax), time at which Vmax occurred, water uptake at which Vmax occurred, final water uptake (UF) and time taken to reach UF. However, there were no significant differences (p>0.05) in volume change. The rate of water uptake was highest in DNB 11-10 (24.00%/h) followed by Kenya Early (19.33%/h) and DSR 11-01 (18.33%/h). The extent of final water uptake was highest in DSS 11-04 (122.0%), DRM 11-14 (118.0%) and DRK 11-12 (113.3%). No significant differences (p>0.05) among varieties were observed in maximum leaching rate (Vlmax) and the time taken to reach final electrical conductivity (tECF) the measure of leaching characteristics. Significant differences (p = 0.05) were observed in time at which Vlmax occurred, electrical conductivity at which Vlmax occurred and final electrical conductivity (ECF). The extent of leaching was highest in DNB 11-10, Mex 142 and DMC 11-13 at 1.00, 0.97 and 0.93 deciSiemen/metre, respectively. All the genotypes DNB 11-10, DSS 11-04, DRK 11-12, DRM 11-14, DPC 11-05, DMC 11-13, DSR 11-01 and Kenya Early are comparable to the control Mexican 142 and are suitable for further use in the canning process according to the results of these physical tests.