a1 Graduate School of Agricultural and Life Sciences, The University of Tokyo; Tokyo 113–8657, Japan
a2 Graduate School of Agriculture, Hokkaido University, Sapporo 060–8589, Japan
a3 Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200032, P.R. China
The genealogy and diversity of the mitochondrial cytochrome oxidase subunit II (COII) gene were investigated for Ostrinia furnacalis in Japan. A preliminary examination of mitochondrial lineages in China and the Philippines was also made. Two lineages (A and B) were found in the COII gene. Lineage A was frequent throughout the Japanese main islands (Hokkaido, Honshu, Shikoku and Kyushu), while the frequency of lineage B varied among these islands. No clear patterns of geographical population structure were found. Population genetic features suggested that the O. furnacalis population harboring the lineage A mitochondria expanded in the recent past, while lineage B showed weak signals of a population expansion. It is not clear whether the two lineages of mtDNA evolved in separate or identical geographical regions. We discuss two hypotheses regarding the two lineages of mtDNA: a cryptic race/species hypothesis and a selective sweep hypothesis.
(Accepted December 18 2007)
(Online publication June 16 2008)
p1 Current address: Agricultural Chemicals Research Laboratory, Sumitomo Chemical Company, Ltd, Takarazuka, Japan.
p2 Current address: Okinawa Prefectural Agricultural Research Center, Itoman, Japan.