Abstract
Ionotropic glutamate receptors are ligand-gated nonselective cation channels that mediate neurotransmission in the central nervous system of animals. Plants possess homologous proteins called glutamate receptor-like channels (GLRs) which are involved in vital physiological processes including seed germination, long-distance signaling, chemotaxis, Ca2+ signaling etc. Till now, a comprehensive genome-wide analysis of the GLR gene family members in different economically important species of Brassica is missing. Considering the origin of allotetraploid Brassica napus from the hybridization between the diploid Brassica oleracea and Brassica rapa, we have identified 11, 27 and 65 GLR genes in B. oleracea, B. rapa and B. napus, respectively showing an expansion of this gene family in B. napus. Chromosomal locations revealed several tandemly duplicated GLR genes in all the three species. Moreover, the gene family expanded in B. napus after allopolyploidization. The phylogenetic analysis showed that the 103 GLRs are classified into three main groups. The exon-intron structures of these genes are not very conserved and showed wide variation in intron numbers. However, protein sequences are much conserved as shown by the presence of ten short amino acid sequence motifs. Predicted cis-acting elements in 1 kb promoters of GLR genes are mainly involved in light, stress and hormone responses. RNA-seq analysis showed that in B. oleracea and B. rapa, some GLRs are more tissue specific than others. In B. napus, some GLRs are downregulated under cold stress, while others are upregulated. In summary, this bioinformatic study of the GLR gene family of the three Brassica species provides evidence for the expansion of this gene family in B. napus and also provided useful information for in-depth studies of their biological functions in Brassica.
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Data availability
Details of genes are given in Table 1. Details of RNA-Seq data obtained and analyzed for this study are mentioned in the manuscript and can be accessed through NCBI GEO database (https://www.ncbi.nlm.nih.gov/geo/).
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BCR, RG and AM conceived the idea and designed the work; BCR, AM and NS carried out the experiments. Manuscript was prepared and edited by BCR, AM and RG. All authors read and approved the final manuscript.
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Roy, B.C., Shukla, N., Gachhui, R. et al. Genome-wide analysis of glutamate receptor gene family in allopolyploid Brassica napus and its diploid progenitors. Genetica 151, 293–310 (2023). https://doi.org/10.1007/s10709-023-00192-y
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DOI: https://doi.org/10.1007/s10709-023-00192-y