1. Plant Breeding and Genetics Section; School of Integrative Plant Science; Cornell Univ.; Ithaca NY 14853
2. Dep. of Statistics; College of Agriculture; Univ. de la República; Garzón 780 Montevideo Uruguay
3. National Rice Research Program; National Institute of Agricultural Research (INIA); INIA Treinta y Tres Villa Sara 33000 Uruguay
4. Biotechnology Unit; National Institute of Agricultural Research (INIA); Estación Experimental Wilson Ferreira Aldunate; Rincón del Colorado 90200 Uruguay
5. Dep. of Plant Biology; College of Agriculture; Univ. de la República; Garzón 809 Montevideo Uruguay
6. Dep. of Agronomy; Univ. of Wisconsin-Madison; 1575 Linden Dr. Madison WI 53706