Two isolates of pea seed-borne mosaic potyvirus, DPD1 and NY, were identified as pathotypes P-1 and P-4, respectively, by their infectivity on L. lines homozygous for the recessive resistance genes and . The two isolates differed in several biological characteristics. DPD1 induced transient vein clearing, downward rolling of leaflets and internode shortening on , whereas NY only caused a slight growth reduction. DPD1 moved systemically in whereas NY was restricted to inoculated leaves. DPD1 was frequently transmitted by seeds whereas NY was rarely seed-transmitted: 24% and 0.3%, respectively, in ‘549’. Both DPD1 and NY were transmitted by aphids (), though a DAG triplet was not present in the N terminus of the coat protein. The nucleotide sequence and deduced amino acid sequence of NY were determined and compared to the corresponding sequences of DPD1.


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