Functional analysis on endogenous pararetrovirus in rice genome-relationship with rice tungro disease-

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We have addressed two questions as to endogenous RTBV; theinsertion mechanism of ERTBV into rice genome and the relationship between ERTBVand RTBV resistance. ERTBVs are preferentially present in AT-rich repeats in ricegenome, and we described that AT-rich repeats have integrated chromosomal andepisomal DNAs, which would have been suspended in the nucleus. We also identified atolerance allele against RTBV, qTDR5, located on chromosome 5 by the genetic analysesusing the progenies between an African rice strain Oryza glaberrima WK18 and a japonicarice strain Taichung 65. The region in qTDR5 contains an ERTBV sequence.