Cryptic Plant Viruses

Boccardo, G.; Vaccari, Lisa; Luisoni, E.; Milne, Robert G.

doi:10.1016/s0065-3527(08)60477-7

Cited by 158 publications

(93 citation statements)

References 39 publications

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“…The viruses in the plant cryptic virus group are small isometric particles of 30 to 38 nm that are transmitted only through seed, cause no apparent symptoms and contain two or three molecules of dsRNA (Boccardo et at., 1987;Milne, 1991). The beet cryptic virus (BCV) first identified in sugar beet has isometric particles about 30 nm in diameter and is widespread in different cultivars of Beta vulgaris (Pullen, , 1969Kassanis et al, 1977).…”

mentioning

confidence: 99%

Nucleotide sequence of beet cryptic virus 3 dsRNA2 which encodes a putative RNA-dependent RNA polymerase

Xie

Antoniw

White

1993

Journal of General Virology

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mentioning

confidence: 99%

Nucleotide sequence of beet cryptic virus 3 dsRNA2 which encodes a putative RNA-dependent RNA polymerase

Xie

Antoniw

White

1993

Journal of General Virology

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“…These are dsRNA viruses that apparently only express genes encoding a replicase and a CP, and replicate inside the virus particles (Boccardo and Accotto, 1988). They are not infectious to plants, but are present at low levels in all cells of plants containing them, being transmitted only vertically through seeds (Boccardo et al, 1987).…”

Section: Rna Silencing Suppressorsmentioning

confidence: 99%

The Road to RNA Silencing is Paved with Plant-Virus Interactions

Palukaitis¹

2011

The Plant Pathology Journal

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RNA silencing has had a large impact on biology in general, as well as on our understanding of plantpathogen interactions, especially interactions between plants and viruses. While most of what we know about the mechanism of RNA silencing was deduced in the last 12 years, many of the interactions between plants and viruses, as well as virus-virus interactions in plants, which we now know are manifestations of RNA silencing, were the subject of decades of work from numerous laboratories. These laboratories were examining the nature and extent of phenomena such as recovery from infection, the formation of dark green islands resistant to re-infection, synergy between unrelated viruses and cross-protection between related viruses, all first described in the late 1920s. In this review, the relationships between these phenomena and their place in the defense mechanism we call RNA silencing will be described, to show how they are all linked.Keywords : RNA silencing, recovery, dark-green islands, cross-protection, synergy, RNA silencing suppressors RNA silencing or RNA interference (RNAi) in animals is a system for regulation of ectopic gene expression, posttranscriptional RNA turnover, removal of aberrant RNAs, silencing of retrotransposons, and defense against virus infection (Brodersen

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“…0000-9221 © 1990 SGM trefoil cryptic virus 1 (HTCV 1) from M. lupulina . Two dsRNAs of estimated Mr 1.27 x 106 and 1.17 × 106, probably those of ACV 1, were associated with particles purified from alfalfa, and a third, larger dsRNA (Mr 2.70 × 106) was found in crude plant extracts and in partially purified virus preparations (Natsuaki et al, 1986;Boccardo et al, 1987).…”

Section: Introductionmentioning

confidence: 95%

“…These viruses are peculiar in that they apparently cause no symptoms and are not grafttransmissible, but they are present in all parts of the carrier plant in a low concentration and their only known means of transmission is through seed and pollen to the progeny (for a review see Boccardo et al, 1987). RNAdependent RNA polymerase activities are associated with purified particles of white clover cryptic viruses 1 and 2 (WCCV 1 and WCCV 2; Boccardo & Accotto, 1988), carnation cryptic virus (CarCV; Marzachi et al, 1988) and beet cryptic virus 1 (BCV 1 ; G. P. Accotto & G. Boccardo, unpublished results).…”

Section: Introductionmentioning

confidence: 99%

Molecular characterization of alfalfa cryptic virus 1

Accotto

Marzachı̀

Luisoni

et al. 1990

Journal of General Virology

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Alfalfa cryptic virus 1 (ACV1) was purified from alfalfa plant clone (Medicago sativa) and characterized. The genome ofACV 1 consists of two dsRNAs, one with an estimated Mr of 1-27 x 106 (RNA 1) and the other of Mr 1.17 x 106 (RNA 2); the virus capsid is built from one polypeptide of estimated Mr 54000. An RNAdependent RNA polymerase able to replicate the genomic RNAs in vitro is associated with purified virus particles. In vitro translation showed that each of the genomic RNAs encodes a polypeptide and that encoded by RNA 2 is the capsid protein. These polypeptides account for about 95 % and 83 % of the coding capacity of RNA 1 and RNA 2, respectively. In Western andNorthern blot experiments close affinity was found between ACV 1 and hop trefoil cryptic virus 1, a cryptovirus found in Medicago lupulina. No affinity was detected with any other cryptovirus tested.

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Cryptic Plant Viruses

Cited by 158 publications

References 39 publications

Nucleotide sequence of beet cryptic virus 3 dsRNA2 which encodes a putative RNA-dependent RNA polymerase

Nucleotide sequence of beet cryptic virus 3 dsRNA2 which encodes a putative RNA-dependent RNA polymerase

The Road to RNA Silencing is Paved with Plant-Virus Interactions

Molecular characterization of alfalfa cryptic virus 1

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