Recent advances in rice genomics have now made it possible to identify and map a number
of genes through linkage to existing DNA markers. Among the more noteworthy examples
of genes that have been tightly linked to molecular markers in rice are those that confer
resistance or tolerance to blast. Therefore, in combination with conventional breeding
approaches, marker-assisted selection (MAS) can be used to monitor the presence or lack
of these genes in breeding populations. For example, marker-assisted backcross breeding
has been used to integrate important genes with significant biological effects into a number
of commonly grown rice varieties. The use of cost-effective, finely mapped microsatellite
markers and MAS strategies should provide opportunities for breeders to develop
high-yield, blast resistance rice cultivars. The aim of this review is to summarize the
current knowledge concerning the linkage of microsatellite markers to rice blast resistance
genes, as well as to explore the use of MAS in rice breeding programs aimed at improving
blast resistance in this species. We also discuss the various advantages, disadvantages and
uses of microsatellite markers relative to other molecular marker types