CHARACTERISTICS OF A POTYVIRUS OF THE BEAN YELLOW MOSAIC-VIRUS SUBGROUP IN SESBANIA-SPECIOSA GERM PLASM

A plant of Sesbania speciosa with leaf mosaic and distortion symptoms was identified in a germ plasm regeneration plot at Griffin, Georgia. The Sesbania virus produced mild or moderate mosaic symptoms on Glycin e mar cvs. Bragg and Tracy M, Lupinus albus, Nicotiana benthamiana, Pi sum sativum cv. Perfected Wales, Phaseolus vulgaris cvs. Black Turtle, Bountiful, and Pinto, and did not infect N. tabacum. Bean yellow mosa ic potyvirus (BYMV) and pea mosaic potyvirus (PMV) do not infect Perfe cted Wales pea and they produce mosaic, distortion, and necrosis on wh ite lupine. The PMV strain tested produced much more severe symptoms o n the three green beans, with top necrosis on Pinto. BYMV produced loc al latent infection of N. tabacum and BYMV and PMV produced mosaic wit h distortion on N. benthamiana. The Sesbania virus was seed-transmitte d at a low rate in S. speciosa. Indirect-enzyme-linked immunosorbent a ssay tests with a general potyvirus monoclonal antibody and BYMV and w hite lupine mosaic virus (WLMV) polyclonal antisera were strongly posi tive. Tests of the Sesbania virus against a monoclonal antibody panel suggests that it is not BYMV or any of the previously described subgro up members, but is a member of the BYMV subgroup. This is the first re port of a seedborne BYMV-like virus of Sesbania spp.