Abstract
NBS-LRR (nucleotide-binding site-leucine-rich repeat), LRR-RLK (LRR-receptor-like kinase), and LRR-only are the three major LRR-encoding genes. Owing to the crucial role played by them in plant resistance, development, and growth, extensive studies have been performed on the NBS-LRR and LRR-RLK genes. However, few studies have focused on these genes collectively; they may co-vary as all of them contain LRR motifs. To investigate their common evolutionary patterns, all major classes of LRR-encoding genes were identified in 12 plant species, and particularly compared in two pairs of close relatives, Arabidopsis thaliana–A. lyrata (At–Al) and Zea mays–Sorghum bicolor. Our results showed that these genes co-vary significantly in terms of their numbers between species and that the genes with certain evolutionary parameters are most likely to have similar functions. The development-related genes have clear orthologous relationships between closely related species, as well as lower nucleotide divergence, and Ka/Ks ratio. In contrast, resistance-related genes have exactly opposite characteristics and favor 11–15 LRRs per gene. This association could be very useful in predicting the function of LRR-encoding genes. The presence of co-variation suggests that LRRs, combined with other domains, can work better in some common functions. In order to cooperate efficiently, there should be balanced gene numbers among the different gene classes.
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This study was supported by the National Natural Science Foundation of China (31071062 & 30930049) and the National Key Project for Gene Transform in China (2009ZX08009-23B).
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Jiao Wang and Shengjun Tan contributed equally to this work.
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Wang, J., Tan, S., Zhang, L. et al. Co-Variation Among Major Classes of LRR-Encoding Genes in Two Pairs of Plant Species. J Mol Evol 72, 498–509 (2011). https://doi.org/10.1007/s00239-011-9448-1
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DOI: https://doi.org/10.1007/s00239-011-9448-1