Affiliation: | (1) International Rice Research Institute, P.O. Box 933, Manila, Philippines;(2) Institute of Agriculture and Forestry, University of Tukuba, Niihari-gun, Sakura-mura, 305 Ibaraki-ken, Japan;(3) Institute of Physical and Chemical Research, Wakoo-si, Hirosawa 2-1, 351 Saitama-ken, Japan |