Reaction of faba bean genotypes to Rhizoctonia solani and resistance stability

Abstract

The production of faba bean (Phaseolus lunatus) is limited due to the occurrence of Rhizoctonia canker, caused by the fungus Rhizoctonia solani. In order to select materials with potential for use in faba beans breeding programs and/or disease integrated management, 72 genotypes were evaluated and also stability of the disease resistance in relation to different pathogen isolates, inoculum densities and soil type. The seeds were sown in soil infested with the pathogen by the addition of colonized substrate (rice grains). The evaluation of genotypes was done after 15 days, using a note scale to discriminate the genotypes into five reaction classes. None of the 72 genotypes showed immunity to R. solani and only four genotypes (F-42, F-49, F-53 and F-58) behaved as highly resistant. The reactions presented by these genotypes varied according to the R. solani isolate, inoculum density and soil used. The genotype F-58 showed more stable resistance to pathogen isolates and inoculum densities. The genotype F-53 showed resistance stability in soils collected in different locations, remaining highly resistant in all situations. The genotype F-58 did not show high resistance to only one tested soil. Therefore, the genotypes F-58 and F-53 are promising sources of resistance to R. solani and should be indicated in areas infested by the pathogen.

Characterization, pathogenicity and anastomosis groups of Rhizoctonia solani from watermelon

“…The with Fava bean was considered one of the most aggressive, which was also observed in our study (Assunção, 2011). Plant samples with symptoms were taken to the laboratory for reisolation to prove the tissues were infected by the fungus.…”

Global distribution, traditional and modern detection, diagnostic, and management approaches of Rhizoctonia solani associated with legume crops

“…Still, some resistant sources have been reported in faba beans to cope with this pathogenic fungus ( Infantino et al, 2006 ). Moreover, 304 faba bean genotypes in Canada were grown, but only five were resistant to R. solani ( Assunção et al, 2011 ). It is suggested to increase the durability of resistance against R. solani using complementary management strategies.…”

“…Soy isoflavones, along with those found in other legumes, have been lately proposed to do double duty by reducing cancer risks and blood cholesterol. Besides being utilized as food and forage, legumes may be processed into flour and used to bake goods, including bread, doughnuts, tortillas, chips, spreads, and extruded snacks ( Assunção et al, 2011 ). Soybean candies, pop beans, and licorice are all creative applications of legumes ( Conti et al, 2021 ).…”

Leguminous Seedborne Pathogens: Seed Health and Sustainable Crop Management

“…R. solani also exhibits seedborne behavior in faba bean, in which, in different global regions, it has been reported as responsible for root rot, collar rot, defoliation ( Figure 6 ) [ 91 , 92 ], and the frequent mortality of plants. In the past, massive economic damages caused by the fungus on this crop forced farmers to abandon their lands, with consequent economic losses also aggravated by the decrease in the plot value [ 93 ]. Among R. solani hosts, soybean also has to be mentioned.…”