Fig. 1

Unequal crossing over resulted in a 285-kb deletion in Chinese Spring. a Dot plot of a 525-kb segment from CH Campala Lr22a against the corresponding 280-kb segment from Chinese Spring. The breakpoints of the 285-kb deletion are indicated by red arrows. The numbers in brackets refer to the positions of the selected region on the respective pseudomolecule. b Pairwise alignment of the Chinese Spring NLR with the two CH Campala Lr22a NLRs shows putative recombination breakpoints that led to the formation of the Chinese Spring NLR. c Proposed model for molecular events that led to a 285-kb deletion in Chinese Spring. An unequal crossing over event involving two NLR genes (shown in blue and orange) led to the formation of the recombinant NLR in Chinese Spring which shares sequence homology with NLR1 (blue) and NLR2 (yellow) and a deletion of the intervening 285 kb sequence