ToMMV病残体中病毒存活力及其传病作用OACSTPCD

Tomato mottle mosaic virus(ToMMV)is a newly occurred virus with wide host range,high infectivity and pathogenicity.In this paper,the tissue distribution and survival time,infection activity and transmission of ToMMV in plant diseased residues were analyzed.The results showed that there was the virus in the leaves,stems and roots of Nicotiana benthamiana plant diseased residues,and ToMMV could survive for a long time in the diseased residues.After 90 days of storing disease-withered leaves at room temperature,the virus still existed and maintained infectivity.Scraping withered leaves with blades to inoculate plants(simulate agricultural operations),it was found that diseased residues had a virus-transmission effect.ToMMV can maintain the infectivity in the diseased residues for a long time,so the diseased residues are likely to be the initial source of infection for the next planting in the field.The soil had no direct virus-transmission effect,but the soil mixed with diseased residues can also become an initial source of infection.In addition,the ToMMV stained on the surface of agricultural tools could still maintain infectivity for a certain time,which is a potential initial source of infection.Thus,removing plant residues(reducing the initial source of infection)is an important step in preventing and controlling the transmission and spread of ToMMV,which should be given attention in production.