Abstract
The mitogen-activated protein kinase (MAPK) cascade is one of the most important pathways in eukaryotic signaling networks, and it plays a crucial role in plant growth and development, hormonal responses, and responses to various biotic and abiotic stress. Foxtail millet (Setaria italica) is a minor cereal with excellent nutritional value and fine adaptability to abiotic stress associated with climate change, and it has also emerged as a C4 model plant. MAPK cascade genes from several model plant species have been analyzed, but not from foxtail millet. Here, 16 SiMPKs and 11 SiMKKs were systematically identified and analyzed in foxtail millet. Phylogenetic relationships, conserved protein motifs, and gene structure indicated clearly that both MPKs and MKKs were divided into four subgroups. RNA-seq data analysis showed that expression profiles of some SiMPK and SiMKK genes varied in different tissues or developmental stages. Furthermore, the expression levels of SiMPK and SiMKK genes under abiotic stresses as well as exogenously applied phytohormone were also investigated. The identified abiotic stress and phytohormone responsive genes suggested that the SiMPKs, SiMKKs, and MKK-MPK interactomes play key roles in abiotic stress and hormone signaling pathways and networks. Our study provides detailed information of MKK and MPK genes in foxtail millet and lays the foundation to explore their functional characterization for stress-tolerance.
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This work was supported by grants from the Key Research and Development Program of Shanxi Province (201903D221095) and the National Natural Science Foundation of China (31900306, 32170410).
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Liang, Z., Wei, S., Guo, Y. et al. Genome‑wide identification of MPK and MKK gene families and their responses to phytohormone treatment and abiotic stress in foxtail millet. Plant Growth Regul 99, 85–99 (2023). https://doi.org/10.1007/s10725-022-00877-y
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DOI: https://doi.org/10.1007/s10725-022-00877-y