The long arm of chromosome 12 is
considered to be one of the most important locations for conferring
resistance against BPH in Oryza species. However, there are no
reports on the molecular cloning of the BPH resistance gene in this
region. In this study, we isolated BPH26 from the long arm of chromosome
12 of the indica cultivar ADR52 (O. sativa L.). Till date, only
a few resistance genes against sap-sucking insects, such as the aphid
resistance gene Mi (Mi-1.2) from tomato23,24 and the BPH resistance
gene Bph1425, have been cloned and their nucleotide sequences have
been reported. Although Bph14 originated from the wild rice variety
O. officinalis on chromosome 3 has already been isolated as a BPH
resistance gene using introgression lines25–27, none of the BPH resistance
genes has been isolated from O. sativa L., which is the main
host plant of BPH.