↵a Not determined.

The mutants are named according to the nomenclature of their collections of origin: Salk_xxx mutants are from the Salk collection (Alonso et al., 2003), Gabi_xxx mutants are from the GABI-Kat collection (Li et al., 2003), EMB xxx mutants are from the SeedGenes project (Tzafrir et al., 2003), and the other mutants are from the Versailles collection (Samson et al., 2002). The targeting column indicates predictions based on Predotar and TargetP scores (see Supplemental Table S3 online), or if the protein localization has been experimentally determined (Table 2), the organelle is indicated in bold. For each mutant, we indicate whether or not homozygotes could be obtained, and if so, the phenotype of the homozygous plants. When homozygotes could not be obtained, in some cases the siliques of heterozygous plants were examined for evidence of embryo abortion, and the phenotype is indicated as embryo defective. Several alleles of the mutants hcf152, crr2, and pgr3 have been described (Hashimoto et al., 2003; Meierhoff et al., 2003; Yamazaki et al., 2004). Unlike the other mutants listed here, these are mostly point mutations and are included for comparison.