ORF C4 of tomato leaf curl geminivirus is a determinant of symptom severity

J E RigdenI Dry


A tomato leaf curl virus (TLCV) mutant has been constructed in vitro that contains T-to-C replacements at nucleotides 2457 and 2463 within the C4 open reading frame (ORF). The mutations destroy the two possible initiator AUG codons for the C4 ORF without disrupting the coding capacity of the C1 ORF which entirely overlaps the C4 ORF. Agroinoculation of the C4 mutant TLCV into three alternative experimental hosts for the virus (Datura stramonium, Lycopersicon esculentum, and Nicotiana tabacum) gives rise to infections which show dramatically reduced symptoms when compared to a wild-type infection, while retaining wild-type levels of all viral DNA species. In most cases the mutations were stably inherited by progeny virus. However, a single tomato plant inoculated with the mutant developed phenotypically wild-type symptoms and was subsequently shown to contain progeny virus in which the mutation at position 2457 had reverted to wild-type sequence, indicating that this AUG may be the site of initiation of translation of the C4 product in the wild-type virus. The results suggest that the C4 ORF encodes a polypeptide which is not required by TLCV to replicate or to spread through the host plant, but is involved in symptom development.


Sep 17, 1996·Proceedings of the National Academy of Sciences of the United States of America·J E RigdenM Ali Rezaian
Jan 28, 2005·Molecular Plant-microbe Interactions : MPMI·Muhammad SaeedM Ali Rezaian
Apr 13, 2007·Molecular Plant-microbe Interactions : MPMI·Vincent N FondongFidelis Achenjang
Jan 13, 2004·Molecular Plant-microbe Interactions : MPMI·Luke A SelthM Ali Rezaian
Oct 24, 2008·Phytopathology·Jimena Carrillo-TrippRafael F Rivera-Bustamante
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Mar 1, 2006·Molecular Plant Pathology·Alexander KrichevskyVitaly Citovsky
Apr 26, 2013·Molecular Plant Pathology·Vincent N Fondong
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Mar 19, 2013·Biochimica Et Biophysica Acta·Debojit GuhaH S Savithri
Jan 31, 2019·Molecular Plant-microbe Interactions : MPMI·Kegui ChenVincent N Fondong

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