Broad-spectrum protection against tombusviruses elicited by defective interfering RNAs in transgenic plants.

Abstract:

:We have designed a DNA cassette to transcribe defective interfering (DI) RNAs of tomato bushy stunt virus (TBSV) and have investigated their potential to protect transgenic Nicotiana benthamiana plants from tombusvirus infections. To produce RNAs with authentic 5' and 3' termini identical to those of the native B10 DI RNA, the DI RNA sequences were flanked by ribozymes (RzDI). When RzDI RNAs transcribed in vitro were mixed with parental TBSV transcripts and inoculated into protoplasts or plants, they became amplified, reduced the accumulation of the parental RNA, and mediated attenuation of the lethal syndrome characteristic of TBSV infections. Analysis of F1 and F2 RzDI transformants indicated that uninfected plants expressed the DI RNAs in low abundance, but these RNAs were amplified to very high levels during TBSV infection. By two weeks postinoculation with TBSV, all untransformed N. benthamiana plants and transformed negative controls died. Although infection of transgenic RzDI plants initially induced moderate to severe symptoms, these plants subsequently recovered, flowered, and set seed. Plants from the same transgenic lines also exhibited broad-spectrum protection against related tombusviruses but remained susceptible to a distantly related tombus-like virus and to unrelated viruses.

journal_name

J Virol

journal_title

Journal of virology

authors

Rubio T,Borja M,Scholthof HB,Feldstein PA,Morris TJ,Jackson AO

doi

10.1128/JVI.73.6.5070-5078.1999

subject

Has Abstract

pub_date

1999-06-01 00:00:00

pages

5070-8

issue

6

eissn

0022-538X

issn

1098-5514

journal_volume

73

pub_type

杂志文章