Abstract
The nucleotide-binding site leucine-rich repeat (NBS-LRR) genes are the largest class of disease resistance genes in plants. However, our understanding of the evolution of NBS-LRR genes in Rutaceae fruit crops is rather limited. We report an evolutionary study of 103 NBS-encoding genes isolated from Poncirus trifoliata (trifoliate orange), Citrus reticulata (tangerine) and their F1 progeny. In all, 58 of the sequences contained a continuous open reading frame. Phylogenetic analysis classified the 58 NBS genes into nine clades, eight of which were genus specific. This was taken to imply that most of the ancestors of these NBS genes evolved after the genus split. The motif pattern of the 58 NBS-encoding genes was consistent with their phylogenetic profile. An extended phylogenetic analysis, incorporating citrus NBS genes from the public database, classified 95 citrus NBS genes into six clades, half of which were genus specific. RFLP analysis showed that citrus NBS-encoding genes have been evolving rapidly, and that they are unstable when passed through an intergeneric cross. Of 32 NBS-encoding genes tracked by gene-specific PCR, 24 showed segregation distortion among a set of 94 F1 individuals. This study provides new insight into the evolution of Rutaceae NBS genes and their behaviour following an intergeneric cross.
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Acknowledgments
This work was supported by the National 863 project, and Natural Science Foundation of China (NSFC Nos. 30800745, 31071779, and 30921002).
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Communicated by Y. Van de Peer.
Q. Xu and M. K. Biswas contributed equally to this work.
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438_2010_593_MOESM2_ESM.tif
Supplementary Fig. 2. Segregation of seven NBS genes among 94 intergeneric F1 individuals. Gene names shown on the left side. P1: C. reticulata; P2: P. trifoliata; 1-94: the set of F1 progeny(TIFF 1142 kb)
438_2010_593_MOESM3_ESM.xls
Supplementary Table 1. Primer sequences used to amplify 32 gene-specific NBS gene fragments among the C. reticulata × P. trifoliata F1 population (XLS 25 kb)
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Xu, Q., Biswas, M.K., Lan, H. et al. Phylogenetic and evolutionary analysis of NBS-encoding genes in Rutaceae fruit crops. Mol Genet Genomics 285, 151–161 (2011). https://doi.org/10.1007/s00438-010-0593-9
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DOI: https://doi.org/10.1007/s00438-010-0593-9