北京玉米和高粱上的玉米矮花叶病毒

 北京郊区玉米和高粱上的三个汁传病毒分离物鉴定为玉米矮花叶病毒株系B (MDMV),它可被桃蚜(Myzus persicoe)由玉米传至玉米,这三个分离物不侵染约翰逊草(Sorghum halepense(L) pers)。稀释终点是10^-2-10^-3;致死温度是50-55℃;体外保毒期是1-2天。MDMV的颗拉长度是735±15毫微米,在染病高粱叶的细胞质中观察到凤轮状内含体。狗尾草(Setaria viridis(L) Beauv),马唐(Digitavia Sanguinalis(L) Scop),蟋蟀草(Eleusine indica(L) Gaertn),矛叶荩草(Arthraxan Lancelatus(Roxb) Hochst)是北京地区MDMV的天然寄主。该病毒也侵染大油芒(Spodiopogon Sibiricus Trin)。

MAIZE DWARF MOSAIC VIRUS OF CORN AND SORGHUM IN BEIJING

Three sap-transmissible virus isolates form Corn and Sorghum in the vic-inity of Beijing were identified as maize dwarf mosaic virus strain-B (MDMV-B).The MDMV-B can be transmitred by green peach aphids (Myzus persicae) from Corn to Corn. Three isolaeet do not infect Johnson grass (Sorghum hale-perse (L.) pers).The inactivation properties of the virus are:(1) dilution and point 10-2-10-3, (2) thermal inactivation point 50-55℃, (3) ageing in vi-fro 1-2 days. Some Flexuous particles approximately 735±15nm and pinwheel inclusions were observed in the cytoplasm of infected sorghum leafcell. Setaria viridis (L) Beauv, Digitaria Sanguinalis (L) Scop, Eleusine indic (L) Gaerth,and Arthraxan Sanguinalis (L) Scop, Eleusine indica (L) Gaertn, and Arthraxan Lancelatus (Roxb) Hochst were found to be the natural hosts of MDMV in the vicinity of BEijing.
The virus also infected Spodiopogon sibiricus Trin, a perannual gramineous plant.