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The effect of different virus isolates on the expression of tolerance to barley yellow dwarf virus in barley
Author(s) -
JONES A. T.,
CATHERALL P. L.
Publication year - 1970
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1970.tb04572.x
Subject(s) - biology , rhopalosiphum padi , barley yellow dwarf , luteovirus , virus , virulence , virology , gene , microbiology and biotechnology , botany , plant virus , genetics , aphididae , homoptera , pest analysis
SUMMARY A barley variety of Ethiopian origin, with a single Mendelian gene con‐fering tolerance to barley yellow dwarf virus (BYDV), was equally tolerant to a number of isolates of the virus, whereas a susceptible European barley was more susceptible to isolates transmitted by Rhopalosiphum padi L. than to those transmitted by Macrosiphum (Sitobion) avenae (Fab). However, hybrids between these two varieties homozygous for the Ethiopian tolerance gene were more tolerant to ‘mild’ than to ‘severe’ isolates, irrespective of the vector specificity. The European variety was damaged more severely by all isolates when infected early than when infected late in its development, but the hybrids were damaged more severely by M. awraae‐transmitted isolates when infected late. It is suggested that in susceptible plants the concentration, rather than the virulence, of the virus determines disease severity, whereas the reverse is true in plants possessing a gene which reduces virus multiplication. Virus concentration appears to determine the severity of R. padi ‐transmitted isolates, while virulence determines the severity of M. avenae ‐transmitted isolates. The latter would also seem to be adapted towards late infection.