Study and characterization of the recessive resistance genes to Pea seed-borne mosaic virus (PSbMV)

Pea seed-borne mosaic virus (PSbMV) belongs among the most frequent viral pathogens causing severe yield and seed quality losses in field pea and other legumes. These losses might be the most effectively prevented by use of resistant varieties. Resistance to the common P1 strain of PSbMV is conferred by a single recessive gene (eIF4E), localized on LG VI (sbm-1 locus), while the resistance to lentil L1 strain is localized on LGII at sbm-2 locus. Germplasm of 2803 pea accessions was screened for eIF4E intron 3 length polymorphism using two sets of primer combinations, resulting in the detection of four eIF4EA-B-C-S variants, whose distribution was geographically structured. In order to identify gene underlaying sbm-2 locus, we have analyzed variation in the candidate eIF(iso)4E gene sequences from selected pea lines, reported as donors of resistance. we analyzed expression of both resistant and sensitive eIF4E alleles in F1 and F2 heterozygous plants, sensitive and resistant homozygotes after PSbMV infection, by qRT-PCR together with evaluation of viral concentration