番茄褪绿病毒(tomato chlorosis virus)的新寄主:水茄(Solanum torvum Swartz)

Tomato chlorosis virus (ToCV) is a plant virus that is mainly propagated by Bemisia tabaci in a semi-persistent and non-circulative manner.It has a wide range of host plants,and has been reported in many countries,causing serious economic losses in vegetable production.In 2019,we investigated about 10 fields,one ha each in Shouguang,Shandong province (China),and in each field we observed symptoms of interveinal chlorosis on lower leaves of the Solanum torvum Swartz,and a large number of B.tabaci gathered on the back of its leaves.To determine the presence of ToCV,total RNA of S.torvum was extracted followed by RT-PCR.The 1 074 (GenBank accessions number MN545620) and 466 bp (GenBank accessions number MN545621) fragments were gel purified and sequenced.The sequences shared 99.44% and 99.57% similarity with ToCV reference sequence tomato chlorosis virus segment RNA1 (AY903447) and RNA2 (AY903448).The results of insect transmission test confirmed that ToCV can spread from S. torvum to tomato.This study confirms S.torvum as a newly reported host of ToCV.     

番茄褪绿病毒与番茄黄化曲叶病毒复合侵染对番茄褪绿病毒传播的影响

番茄褪绿病毒Tomato chlorosis virus(ToCV)是一种由烟粉虱Bemisia tabaci传播的正义单链RNA病毒,在田间常与番茄黄化曲叶病毒Tomato yellow leaf curl virus(TYLCV)复合侵染而造成番茄生产上重大的经济损失。为了明确ToCV与TYLCV的复合侵染对烟粉虱传播ToCV所造成的影响,本文采用RT-PCR以及qRT-PCR检测了复合侵染的番茄对烟粉虱获取和传播ToCV的影响。研究表明,烟粉虱取食复合侵染的番茄后对ToCV的传播效率显著提高,仅25头烟粉虱的传毒率即可达到100%,ToCV在烟粉虱以及番茄体内的累积量均显著提高。说明这种复合侵染促进了烟粉虱对ToCV的传播,在田间应当及时防控烟粉虱,警惕病毒与烟粉虱的蔓延。     

番茄褪绿病毒(tomato chlorosis virus)的新寄主:水茄(Solanum torvum Swartz)

Tomato chlorosis virus (ToCV) is a plant virus that is mainly propagated by Bemisia tabaci in a semi-persistent and non-circulative manner.It has a wide range of host plants,and has been reported in many countries,causing serious economic losses in vegetable production.In 2019,we investigated about 10 fields,one ha each in Shouguang,Shandong province (China),and in each field we observed symptoms of interveinal chlorosis on lower leaves of the Solanum torvum Swartz,and a large number of B.tabaci gathered on the back of its leaves.To determine the presence of ToCV,total RNA of S.torvum was extracted followed by RT-PCR.The 1 074 (GenBank accessions number MN545620) and 466 bp (GenBank accessions number MN545621) fragments were gel purified and sequenced.The sequences shared 99.44% and 99.57% similarity with ToCV reference sequence tomato chlorosis virus segment RNA1 (AY903447) and RNA2 (AY903448).The results of insect transmission test confirmed that ToCV can spread from S. torvum to tomato.This study confirms S.torvum as a newly reported host of ToCV.