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Biological and molecular properties of a pathotype P-1 and a pathotype P-4 isolate of pea seed-borne mosaic virus

¹ Department of Microbiology and Center for Gene Research and Biotechnology, Oregon State University, Corvallis, OR 97331-3804
and² Department of Botany and Plant Pathology, Oregon State University, Corvallis, OR 97331-2902, USA

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 Pisum sativum L. lines homozygous for the recessive resistance genes sbm-1 and sbm-4. The two isolates differed in several biological characteristics. DPD1 induced transient vein clearing, downward rolling of leaflets and internode shortening on P. sativum, whereas NY only caused a slight growth reduction. DPD1 moved systemically in Chenopodium quinoa 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 P. sativum ‘549’. Both DPD1 and NY were transmitted by aphids (Myzus persicae), 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.

^* Author for correspondence. Present address: The Danish Institute of Plant and Soil Science, Biotechnology Group, Lottenborgvej 2, DK-2800 Lyngby, Denmark. Fax +45 45 87 25 10. e-mail e.johansen@dips-Lyngby.dk

Received 19 October 1995; accepted 12 February 1996.

This article has been cited by other articles:

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