Additional files Suppl. Figure 1 - Chromosomal localization of COS marker TC176835 using disomic wheat-rye addition lines. Lanes: (1) H2O, (2) T. aestivum cv. 'Chinese Spring', (3) S. cereale cv. 'Imperial', (4) 21"+1R", (5) 21"+1RS", (6) 21"+1RL", (7) 21"+2R´/21"+2R´+2RL´, (8) 21"+2RL", (9) 21"+3R", (10) 21"+3RS", (11) 21"+4R", (12) 21"+4RS", (13) 21"+4RL", (14) 21"+5R", (15) 21"+5RS", (16) 21"+5RL", (17) 21"+6R", (18) 21"+6RS", (19) 21"+6RL", (20) 21"+7R", (21) 21"+7RS", (22) 21"+7RL", (23) S. cereale line L301-N, (24) S. cereale line L7. Suppl. Tab. 1 – PCR primers and conditions for the 4RL COS markers. a) Designated according to EST consensus identifiers deposited in the TIGR. Suppl. Table 2 - Summary of the COS-marker development for the Rfp1 region. a Rye markers with best sequence identity to rice genes were designated according to EST consensus identifiers deposited in the TIGR. b RFLP probe identifier. c The TIGR identifier for rice genes. d E value of the pairwise BLASTN comparison between wheat or barley EST unigene and rice genes. e The identifier for Brachypodium distachion (Bd) and Sorghum bicolor (Sb) genes orthologous to the corresponding rice gene. f GenBank Acc. N° of the member the EST consensus sequence, which has been physically mapped in wheat. g Wheat bin name of the mapped EST according to the GrainGenes-SQL database. h EST marker mapped in barley according to Mayer et al. (2011). i RE: restriction enzyme used in case of invariant amplicon. 1 j observed fragment sizes [bp] of the non-restorer allele (A) and the restorer allele (B) segregating in the mapping populations. % : no ortholog identified Suppl. Tab. 3 – Survey on QTL for yield and yield components deposited in the Gramene database for the a segment on rice chromosome 2 and 6 orthologous to rye chromosome 4RL. 2