The Bph18 gene was originally identified in an indica introgression
line, IR65482-7-216-1-2, and it expresses strong resistance to the BPH biotype of Korea. The STS marker 7312.T4A linked to the Bph18 gene has been developed by using bacterial artificial chromosome (BAC)-clone derived sequence information of a putative BPH resistance gene (Jena et al., 2006).