1. División de Genética and Instituto de Bioingenierı́a, Universidad Miguel Hernández, Campus de Elche, 03202 Elche, Alicante, Spain (J.L.M.); and
2. Plant Gene Expression Center, United States Department of Agriculture-Agricultural Research Service, and Department of Plant and Microbial Biology, University of California, Berkeley, Albany, California 94710 (S.H.)