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It is well established that viroid derived small RNA (vd-sRNA) induces RNA silencing of endogenous mRNA. However, it remains not clear how exactly viroid infections can lead to severe symptom induction given the fact that fewer vd-sRNAs binding the specific target mRNAs were recovered from the infected plants. To answer this question, the two least expressed (+) and (−) strand vd-sRNAs of potato spindle tuber viroid (PSTVd) binding to both the 3′ UTR and the coding region of tomato mRNAs were analyzed by infecting tomato plants with two variants of PSTVd. As products of these putative target mRNAs are involved in plant phenotype, the effect of this viroid on these genes were analyzed by infecting tomato plants with two variants of PSTVd. The direct interaction between the vd-sRNAs and putative mRNAs was validated by artificial microRNA experiments in a transient expression system and by RNA ligase-mediated rapid amplification of cDNA ends. Parallel analysis of RNA ends of viroid infected plants revealed the widespread cleavage of the target mRNAs in locations other than the vd-sRNA binding site during the viroid infection implying the viroid-infection induced vd-sRNA independent degradation of endogenous mRNAs during viroid infection.

scientific reports

Potato spindle tuber viroid infection triggers degradation of chloride channel protein CLC-b-like and Ribosomal protein S3a-like mRNAs in tomato plants