[1] Intl. Rice Research Institute, MCPO Box 3127, 1271 Makati City, Philippines
[2] Department of Agronomy, University of Missouri-Columbia, Columbia, MO 65211, United States
[3] Tamil Nadu Agricultural University, Coimbatore 641 003, Tamil Nadu, India
[4] Ctr. Coop. Internationale Rech. A., TA 4003 Avenue Agropolis, 34398 Montpellier Cedex 5, France