Submitted to: Plant Disease
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: April 7, 1998
Publication Date: N/A
Interpretive Summary: Sesbania is a genus of plants with a potential use for fiber, soil improvement, pulp, gum, and other things, such as ornamental. A virus found to be carried in the seed was identified on plants of this genus as they were being increased for maintenance and distribution. This virus was characterized based upon its reactions on various host plants and by serology and electron microscopy. It was found to be a member of the potyvirus group and of the bean yellow mosaic virus subgroup, but was not a strain of bean yellow mosaic virus or of any of the other described members of the subgroup. It is the first of this group of viruses to be identified on Sesbania and it must be considered a potential threat in the movement of germplasm from one geographic area to another since it is seedborne and can infect other crops such as beans, soybeans, and white lupine.
Technical Abstract: A plant of Sesbania speciosa with leaf mosaic and distortion symptoms was identified in a germplasm regeneration plot. Potyvirus-like particles were observed in negative stain preparations. The Sesbania virus produced mild or moderate mosaic symptoms on Glycine max cvs Bragg and Tracy M, Lupinus albus, Nicotiana benthamiana, Pisum satum cv Perfected Wales, Phaseolus vulgaris cvs Black Turtle, Bountiful, and Pinto, and did not infect N. tabacum. Bean yellow mosaic potyvirus (BYMV) and pea mosaic virus (PMV) do not infect Perfected Wales pea and they produce mosaic, distortion, and necrosis on white lupine. The PMV strain tested produced much more severe symptoms on the three green beans, with top necrosis on Pinto. Local latent infection of N. tabacum by BYMV and mosaic with distortion on N. benthamiana are produced by BYMV and PMV. The Sesbania virus was seed transmitted at a rate of 1 in 150 plants. Indirect-ELISA tests with a general potyvirus monoclonal antibody and BYMV and white lupi mosaic virus (WLMV) polyclonal antisera were strongly positive. Tests of the Sesbania virus against a monoclonal antibody panel suggests that it is not BYMV or any of the previously described subgroup members, but it is a member of the BYMB subgroup. This is the first report of a seedborne BYMV-like virus of Sesbania.