Evaluation of disease severity caused byBean golden mosaic virusin different bean cultivars

Common bean (Phaseolus vulgarisL.) can be affected by several viral diseases, including golden mosaic caused by theBean golden mosaic virus(BGMV). When infected by BGMV, bean plants undergo major physiological changes, leading to a reduction or complete loss of productivity. This study aimed to evaluate and compare seven bean cultivars and lineages, as well as the legume calopo (Calopogonium mucunoidesDesv.), for the severity of golden mosaic symptoms and BGMV titre following inoculation. The study was conducted in the greenhouse under controlled environmental conditions. Plants were inoculated with viruliferous whiteflies [Bemisia tabaci(Gennadius)], and evaluated for severity of disease symptoms at 7, 10, 15, 20, and 25 days after inoculation (DAI). The virus titre was measured by quantitative PCR (qPCR) analysis with primers specific for the virus coat protein gene. All bean genotypes were symptomatic for BGMV infection, but calopo was not. There were differences among the tested cultivars and lineages for the expression of symptoms. Differences in BGMV titre also were observed among the cultivars at 10 and 25 DAI. The bean cultivar 'Tangara' had a greater viral titre but exhibited lower symptom severity than the other cultivars. Calapo was tolerant to BGMV.

Automated summary

The study evaluated seven bean cultivars and the legume calopo for the severity of golden mosaic symptoms and BGMV titre, finding that calopo showed high resistance while bean cultivars exhibited differences in symptom expression.