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Viral coat protein is targeted to, but does not gate, plasmodesmata during cell‐to‐cell movement of potato virus X
Author(s) -
Oparka K.J.,
Roberts A.G.,
Roberts I.M.,
Prior D.A.M.,
Cruz S.
Publication year - 1996
Publication title -
the plant journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.058
H-Index - 269
eISSN - 1365-313X
pISSN - 0960-7412
DOI - 10.1046/j.1365-313x.1996.10050805.x
Subject(s) - plasmodesma , movement protein , potato virus x , tobacco mosaic virus , biology , green fluorescent protein , tobamovirus , virology , virus , mutant , transgene , microbiology and biotechnology , coat protein , plant virus , gene , rna , genetics , cytoplasm
The coat protein (CP) of potato virus X was localized immunocytochemically in infected leaves of susceptible Nicotiana species and shown to be targeted to the central cavity of plasmodesmata in virus‐infected cells. A viral deletion mutant, in which the CP gene was replaced with the gene for the green fluorescent protein (GFP), was restricted to single, inoculated cells. However, movement of the mutant virus was rescued on transgenic plants constitutively expressing the CP gene, and the CP was again targeted to plasmodesmata. The CP was not localized to plasmodesmata in uninfected transgenic plants and, in contrast to the plasmodesmata of PVX‐infected cells, the plasmodesmata of the transgenic plants did not allow the passage of 10 kDa fluorescent dextrans. We propose that the CP is not involved in plasmodesmal gating per se , but is necessary for transport of the viral RNA to, and possibly through, plasmodesmata.