Evaluation of Common Bean (Phaseolus Vulgaris L.) Genotypes for Disease Tolerance Under Rain-Fed Conditions

Abstract

SUMMARYBreeding for disease tolerance in common bean (Phaseolus vulgaris L.) can improve yields for small-scale and commercial bean producers. This study evaluated promising common bean (Phaseolus vulgaris L.) genotypes for disease tolerance under rain-fed conditions at Harare Research Centre in Zimbabwe. A total of 25 genotypes, sourced from the International Center for Tropical Agriculture (CIAT), Malawi and Crop Breeding Institute (CBI), Harare were used in the experiment. These were replicated three times in a CRBD, and the results of disease evaluations were analysed using GenStat Discovery Edition 3 (VSN International Ltd., 2016). The germination percentages for all the genotypes ranged between 97.33 and 100% and the days to 50% flowering ranged from 35 to 42 days. The genotype CIM-NAV02-16-2 attained the highest yield of 2541 kg/ha, with genotype CIM-DWRF-CLIM01-1-1 and GCI-5Y-275-RAR-1 falling second and third with 2516 kg/ha and 2168 kg/ha respectively. There were significant (p <0.05) differences in the severity scores for angular leaf spot (Phaeoisariopsis griseola), common bacterial blight (Xanthomonas phaseoli) and rust (Uromyces appendiculatus) among the different common bean genotypes. The genotypes GCI-5Y-275-RAR-1, CIM-DWRF-CLIM01-1-1 and DAB 524 were tolerant to angular leaf spot (P.griseola). All the genotypes were highly susceptible to common bacterial blight (X. phaseoli). The only genotype with significant levels of rust, U. appendiculatus was MR14215-9; the remaining 24 varieties were tolerant. Two superior breeding lines CIM-NAV02-16-2 and CIM-DWRF-CLIM01-1-1 were relatively resistant to all the diseases evaluated in the study and it is recommended that they be advanced for further assessments.

​​Evaluation of Dry Bean Cultivars in Turkey for Resistance against Common Bacterial Blight Disease

“…Previously, similar research results were also reported in Turkey and in different parts of the world for differentiating the interaction between different bean genotypes with CBB pathogen and identifying some potential genotypes which had a resistant gene for CBB resistance breeding activities (Dursun et al, (2002;Donmez et al, 2013;Ararsa et al, 2017;Alladassi et al, 2018). On the contrary, Benlioğlu et al (1994) and Takudzwa et al (2017) showed that none of the evaluated beans were immune and resistant to CBB in Turkey and Serbia, respectively.…”

Bone quality and incidence of urolithiasis in male broiler breeders fed a male or female ration.

“…All differences were considered significant at P<0.05. The KLS data was transformed using square root transformation (Equation 3.3) in order to run a t test (St-Pierre et al, 2018, Bishara and Hittner, 2012, Mandizvo et al, 2016 Equation 3.3…”