(8)ClYVV-MM分離株と野生株のキメラを用いた病徴発現解析

概要

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Wild type Clover yellow vein virus (ClYVV) induces severe necrosis in broad bean plants. A spontaneous mutant (MM) that induces mosaic symptoms with replication efficiency similar to wild type was isolated. To determine the domain in the viral genome involve in necrosis induction, cDNAs to genomic RNA of MM mutant were exchanged with corresponding wild type fragment. Three chimeric clones, pClYVV/CN, pClYVV/NS and pClYVV/SS were made and inoculated to broad beans. Symptom severity was scored and viral accumulation was measured by western blot. pClYVV/NS and pClYVV/SS induced symptoms essentially the same as the wild type. Viral accumulation in broad beans after inoculation of these constructs are also similar to the wild type. On the other hand, pClYVV/CN containing the C-terminal P1 to N-terminal P3 of MM caused a drastic symptom change to mild chlorosis with debilitated infectivity. Sequence analysis of this MM regions showed amino acid substitutions at P1 (E182G), HCPro (T27I, I33V, R51I, D193Y, L327Q, V393I) and P3 (N122S). These results indicate that the ability to induce necrosis and the control of viral accumulation are mapped in the C-terminal P1 to N-terminal P3 region of ClYVV.
日本植物病理学会の論文
2003-02-25