Arabidopsis RTM1 and RTM2 genes function in phloem to restrict long-distance movement of tobacco etch virus.
Restriction of long-distance movement of tobacco etch virus (TEV) in Arabidopsis ecotype Col-0 plants requires the function of at least three genes: RTM1 (restricted TEV movement 1), RTM2, and RTM3. The mechanism of TEV movement restriction remains poorly understood, although it does not involve a hypersensitive response or systemic acquired resistance. A functional characterization of RTM1 and RTM2 was done. The RTM1 protein was found to be soluble with the potential to form self-interacting complexes. The regulatory regions of both the RTM1 and RTM2 genes were analyzed using reporter constructs. The regulatory sequences from both genes directed expression of beta-glucuronidase exclusively in phloem-associated cells. Translational fusion proteins containing the green fluorescent protein and RTM1 or RTM2 localized to sieve elements when expressed from their native regulatory sequences. Thus, components of the RTM system may function within phloem, and sieve elements in particular, to restrict TEV long-distance movement.
Chisholm
S T
ST
Institute of Biological Chemistry, Washington State University, Pullman, Washington 99164-6340, USA.
Parra
M A
MA
Anderberg
R J
RJ
Carrington
J C
JC
D017360:Arabidopsis / Q000235:genetics* / Q000502:physiology; D029681:Arabidopsis Proteins / Q000235:genetics* / Q000502:physiology; D001692:Biological Transport; D004926:Escherichia coli / Q000235:genetics; D018506:Gene Expression Regulation, Plant; D006360:Heat-Shock Proteins / Q000235:genetics* / Q000502:physiology; D037102:Lectins / Q000235:genetics* / Q000502:physiology; D010935:Plant Diseases / Q000821:virology; D037121:Plant Lectins; D010940:Plant Proteins; D018514:Plant Structures / Q000235:genetics / Q000502:physiology; D030821:Plants, Genetically Modified; D017800:Potyvirus / Q000502:physiology; D014026:Nicotiana / Q000821:virology
D029681:Arabidopsis Proteins; D006360:Heat-Shock Proteins; D037102:Lectins; D037121:Plant Lectins; D010940:Plant Proteins; C403528:RTM1 protein, Arabidopsis; C409742:RTM2 protein, Arabidopsis