Three strains of bean yellow mosaic virus: symptoms and accumulation in eight pea cultivars (Pisum sativum L.)

Abstract

Helsinki, Finland.) A pea mosaic strain and a bean strain of bean yellow mosaic virus (BYMV) were isolated from naturally infected pea and broad bean plants and named BYMV-Ps and BYMV-Vf, respectively. A third strain of BYMV isolated from Gladiolus (BYMV-G) was obtained from Denmark which was distinguished from the two above strains serologically and by its symptoms in test plants.BYMV-Ps and BYMV-Vfcaused yellow mosaic symptoms and green mosaic symptoms, respectively, in eight pea cultivars tested, but the concentration of BYMV varied among the cultivars. BYMV-G caused mild mosaic or vein clearing in peas. A need to improve resistance to BYMV in the Finnish pea varieties was recognized.

Resistance to six viruses in the legume goat's rue {Galega orientalis Lam.)

“…in Southern Finland, are not common in goat's rue, although goat's rue has been grown in the same area in perennial leys for 15 years (Markkula. 1963;Tapio, 1970;Virkajarvi & Varis, 1991;Valkonen, 1993). Similarly, goat's rue was not found to be infected with CMV that is non-persistently transmitted by aphids and common in cucumber and tomato in Southern Finland (Linnasalmi & Toiviainen, 1974;Francki, Mossop & Hatta, 1979), and which has been found to cause severe damage in legumes elsewhere (Jones, 1988(Jones, , 1991.…”

“…The following virus isolates were used for inoculations: a pea mosaic strain (BYMV-Ps) and a common strain of BYMV (BYMV-Vf) from pea (Pisum sativum L.) and broad bean (Viciu fuba L.)? respectively, collected in the field in Southern Finland (Valkonen, 1993); a strain of RCMV causing necrosis in pea (Bos & Maat, 1965), BBSV (isolate TV73-85; Makkouk er ul.. 1987): BCMV and AMV isolated from bean and potato. respectively, in Peru; and CMV with an unknown origin from Peru.…”