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Increased disease severity induced by some comoviruses in bean genotypes possessing monogenic dominant resistance to bean common mosaic potyvirus

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Title Increased disease severity induced by some comoviruses in bean genotypes possessing monogenic dominant resistance to bean common mosaic potyvirus
 
Creator Morales, Francisco José
Castaño, M.
 
Subject phaseolus vulgaris
cultivars
bean common mosaic virus
resistance
strains
serology
variedades
virus del mosaico común frijol
resistencia
cepas
serologia
 
Description Three comoviruses isolated from diseased bean plants in Brazil (CV-BZ), Venezuela (CV-VZ), and Honduras (CV-HD) were inoculated to 53 bean genotypes possessing or lacking the dominant alleles of the necrosis (I) gene, which conditions resistance to bean common mosaic virus (BCMV). These comoviruses systemically infected all bean genotypes tested, predominantly inducing mosaic and plant malformation. Symptom expression was considerably enhanced in bean cultivars possessing the dominant I gene, particularly when infected by CV-VZ and CV-HD. The latter comovirus also induced necrotic symptoms in dominant I gene bean cultivars, regardless of the absence or presence of specific recessive genes, which protect the I gene against necrotic BCMV strains. The test comoviruses also induced top necrosis in two bean genotypes, Arbolito Retinto and Honduras 46, which do not possess the dominant alleles of the necrosis gene. The implications of these findings are important considering that most of the improved bean cultivars grown in Latin America, the United States, and Europe possess monogenic dominant resistance to BCMV and that some of the chrysomelid vectors of these comoviruses also are present in temperate countries.
 
Date 1992
2014-09-24T08:42:19Z
2014-09-24T08:42:19Z
 
Type Journal Article
 
Identifier 0191-2917
https://hdl.handle.net/10568/43565
https://doi.org/10.1094/PD-76-0570
 
Language en
 
Rights Open Access
 
Publisher Scientific Societies
 
Source Plant Disease