Graft transmission of post-transcriptional gene silencing: Target specificity for RNA degradation is transmissible between silenced and non-silenced plants, but not between silenced plants

Shoji Sonoda, Masamichi Nishiguchi

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

Using the grafting procedure, we examined the transmission of post-transcriptional gene silencing (PTGS) in Nicotiana benthamiana which had been transformed with the coat protein gene, including the 3' non-translated region of the sweet potato feathery mottle potyvirus. Transmission of PTGS from silenced lines to non-silenced ones was bidirectional, but occurred efficiently from root stocks to scions. The level of transgene methylation in non-silenced scions grafted onto silenced root stocks was not increased. When grafted scions which had become silenced were removed from silenced root stocks and regrafted onto non-silenced or vector-transformed root stocks, PTGS was maintained. However, their progeny did not show PTGS. Previously we reported that our transgenic lines had different target specificities of PTGS for RNA degradation: one line recognized only the 3' part of the transgene mRNA while others involved the whole transgene mRNA (Sonoda et al., 1999, Phytopathology, 89, 385-391). Using these lines, we showed that target specificity of PTGS induced in non-silenced scions after grafting was determined by that in silenced root stocks. However, unexpectedly, target specificity of PTGS induced in silenced scions after grafting was not changed by grafting onto silenced root stocks showing different target specificity, indicating that the second PTGS from silenced root stocks was not superimposed to silenced scions.

Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalPlant Journal
Volume21
Issue number1
DOIs
Publication statusPublished - Jan 2000
Externally publishedYes

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RNA Stability
RNA Interference
RNA interference
scions
RNA
Transplants
degradation
grafting (plants)
Transgenes
transgenes
Sweet potato feathery mottle virus
Plant Pathology
Potyvirus
Ipomoea batatas
Messenger RNA
Nicotiana benthamiana
plant pathology
Capsid Proteins
coat proteins
methylation

ASJC Scopus subject areas

  • Plant Science

Cite this

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abstract = "Using the grafting procedure, we examined the transmission of post-transcriptional gene silencing (PTGS) in Nicotiana benthamiana which had been transformed with the coat protein gene, including the 3' non-translated region of the sweet potato feathery mottle potyvirus. Transmission of PTGS from silenced lines to non-silenced ones was bidirectional, but occurred efficiently from root stocks to scions. The level of transgene methylation in non-silenced scions grafted onto silenced root stocks was not increased. When grafted scions which had become silenced were removed from silenced root stocks and regrafted onto non-silenced or vector-transformed root stocks, PTGS was maintained. However, their progeny did not show PTGS. Previously we reported that our transgenic lines had different target specificities of PTGS for RNA degradation: one line recognized only the 3' part of the transgene mRNA while others involved the whole transgene mRNA (Sonoda et al., 1999, Phytopathology, 89, 385-391). Using these lines, we showed that target specificity of PTGS induced in non-silenced scions after grafting was determined by that in silenced root stocks. However, unexpectedly, target specificity of PTGS induced in silenced scions after grafting was not changed by grafting onto silenced root stocks showing different target specificity, indicating that the second PTGS from silenced root stocks was not superimposed to silenced scions.",
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