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Isolation of an Arabidopsis thaliana mutant in which accumulation of cucumber mosaic virus coat protein is delayed
Author(s) -
Yoshii Motoyasu,
Yoshioka Norimichi,
Ishikawa Masayuki,
Naito Satoshi
Publication year - 1998
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.1998.00024.x
Subject(s) - cucumber mosaic virus , biology , virology , mutant , virus , arabidopsis thaliana , cucumovirus , rna , viral replication , turnip mosaic virus , plant virus , potyvirus , genetics , gene
Summary Cucumber mosaic virus (CMV) is known to systemically infect Arabidopsis thaliana ecotype Columbia plants. In order to identify the host factors involved in the multiplication of CMV, we isolated an A. thaliana mutant in which the accumulation of the coat protein (CP) of CMV in upper uninoculated leaves was delayed. Genetic analyses suggested that the phenotype of delayed accumulation of CMV CP in the mutant plants was caused by a single, nuclear and recessive mutation designated cum1‐1 , which was located on chromosome IV. The cum1‐1 mutation did not affect the multiplication of tobacco mosaic virus, turnip crinkle virus or turnip yellow mosaic virus, which belong to different taxonomic groups from CMV. Accumulation of CMV CP in the inoculated leaves of cum1‐1 plants was also delayed either when CMV virion or CMV virion RNA was inoculated. On the other hand, when cum1‐1 and the wild‐type Col‐0 protoplasts were inoculated with CMV virion RNA by electroporation, the accumulations of CMV‐related RNAs and the coat protein were similar. These results suggest that the cum1‐1 mutation did not affect the uncoating of CMV virion and subsequent replication in an initially infected cell but affected the spreading of CMV within an infected leaf, possibly the cell‐to‐cell movement of CMV in a virus‐specific manner.