STUDY ON ALFALFA MOSAIC VIRUSWHITE CLOVER ISOLATE (Wc)
Abstract: A virus isolate-Wc has been obtained from diseased white clover which grows in the campus of Northwestern Agricultural University. The Wc isolate only gives necrotic local lesions on bean and cowpea without systematic spread, but systematic on tobacco. The thermal death point is between 50—55℃. The life in vitro is 12—24 hours and the dilution end point is 10~(-2)—10~(-3).Under EM, partially purified virus preparation presents five components with uniform width(18—20nm) but different in length (58, 52, 41, ...