Open AccessA single‐stranded conformational polymorphism (SSCP)‐derived quantitative variable to monitor the virulence of a Barley yellow dwarf virus ‐PAV (BYDV‐PAV) isolate during adaptation to the TC14 resistant wheat line
Author(s) -
DELAUNAY AGNES,
LACROIX CHRISTELLE,
MORLIERE STEPHANIE,
RIAULT GERARD,
CHAIN FLORIAN,
TROTTET MAXIME,
JACQUOT EMMANUEL
Publication year - 2010
Publication title -
molecular plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.945
H-Index - 103
eISSN - 1364-3703
pISSN - 1464-6722
DOI - 10.1111/j.1364-3703.2010.00635.x
Subject(s) - barley yellow dwarf , single strand conformation polymorphism , biology , virulence , adaptation (eye) , genetics , virus , polymorphism (computer science) , virology , plant virus , polymerase chain reaction , genotype , gene , neuroscience
SUMMARY A standardized single‐stranded conformational polymorphism (SSCP) procedure is proposed as an alternative to the time‐consuming biological characterization of Barley yellow dwarf virus ‐PAV (BYDV‐PAV) isolates. Using this procedure, six of 21 overlapping regions used to scan the viral genome gave patterns specific to ‘4E’ (avirulent) or ‘4T’ (‘4E’‐derived virulent) isolates. The calibration of samples and integration of SSCP patterns corresponding to the nucleotide region 1482–2023 allowed the estimation of P T values that reflect the proportions of a ‘4T’‐specific band. Analysis of the biological (area under the pathogen progress curve) and molecular (P T ) data suggested a positive linear relation between these variables. Moreover, sequence analysis of the nucleotide region 1482–2023 highlighted the presence of a nucleotide polymorphism (C/A 1835 ) which can be considered as a candidate for virus–host interactions linked to the monitored virulence. According to these parameters, P T values associated with ‘4E’‐ and ‘4T’‐derived populations show that: (i) long‐term infection of a BYDV‐PAV isolate on the ‘ TC14 ’ resistant host leads to the fixation of virulent individuals in viral populations; and (ii) the introduction of susceptible hosts in successive ‘ TC14 ’ infections results in the maintenance of low virulence of the populations. Thus, the presented study demonstrates that SSCP is a useful tool for monitoring viral populations during the host adaptation process. The described impact of host alternation provides new opportunities for the use of the ‘ TC14 ’ resistance source in BYDV‐resistant breeding programmes. This study is part of the global effort made by the scientific community to propose sustainable alternatives to the chemical control of this viral disease.