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Acta Horticulturae Sinica ›› 2025, Vol. 52 ›› Issue (3): 749-760.doi: 10.16420/j.issn.0513-353x.2024-0050

• Plant Protection • Previous Articles     Next Articles

Identification of Infectivity of 13 Viroid RNA and DNA Genomes of Tomato

LU Xiuping1, TANG Zhichao1, TANG Wenkun1, Mao Feifeng2, ZHANG Wanping1, LI Jingwei1,**()   

  1. 1 Vegetable Industry Research Institute of Guizhou University,Guizhou Guiyang,Guizhou 550025,China
    2 Guizhou Provincial Fruit and Vegetable Workstation,Guizhou 550001,China
  • Received:2024-11-08 Revised:2025-01-09 Online:2025-03-25 Published:2025-03-25
  • Contact: LI Jingwei

Abstract:

Thirteen types of viroids that have been widely reported in horticultural plants were selected. Their artificially synthesized cDNA was digested by Sac I and Spe I enzymes and transcribed into conventional RNA genomes in vitro by T7 enzyme. At the same time,PCR was used to synthesize full-length genomes of various viroids DNA genome. The RNA and DNA genomes were mechanically rubbed and inoculated onto Ailsa Craig tomato seedlings,and the infection efficiency of different types of viroids on tomatoes was detected by RT-PCR and RT-qPCR. Artificial inoculation of viroid genomes was conducted in both RNA and DNA forms,and the results showed that in addition to the conventional RNA genomes,the viroid DNA genomes also have infectivity,with differences in infectivity between a small amount of viral RNA and DNA genomes. Overall,all 13 types of viroids can infect tomatoes and cause diseases such as plant dwarfism,leaf shedding,leaf curling,leatheriness,and yellowing. Among them,CChMVd,ELVd-1,PSTVd,TCDVd,TPMVd,and HSVd have stronger infectivity,with higher titers in infected plants and higher disease indices. PLMVd has a lower average titer within the plant,but higher pathogenicity. The RT-PCR detection products after infection are basically consistent with the sequencing of artificially synthesized cDNA sequences.

Key words: tomato, viroid, RNA genome, cDNA genome, infectivity evaluation