A new physical mapping approach refines the sex-determining gene positions on the silene latifolia Y-chromosome by Kazama, Y, Ishii, K, Aonuma, W, Ikeda, T, Kawamoto, H, Koizumi, A, Filatov, D, Chibalina, M, Bergero, R, Charlesworth, D, Abe, T, Kawano, S