Abstract
Key message
Transformation of MruGSTU39 in M. ruthenica and alfalfa enhanced growth and survival of transgenic plants by up-regulating GST and glutathione peroxidase activity to detoxify ROS under drought stress.
Abstract
Glutathione S-transferases (GSTs) are ubiquitous supergene family which play crucial roles in detoxification of reactive oxygen species (ROS). Despite studies on GSTs, few studies have focused on them in perennial, wild plant species with high tolerance to environmental stress. Here, we identified 66 MruGST genes from the genome of Medicago ruthenica, a perennial legume species native to temperate grasslands with high tolerance to environmental stress. These genes were divided into eight classes based on their conserved domains, phylogenetic tree and gene structure, with the tau class being the most numerous. Duplication analysis revealed that GST family in M. ruthenica was expanded by segmental and tandem duplication. Several drought-responsive MruGSTs were identified by transcriptomic analyses. Of them, expression of MruGSTU39 was up-regulated much more in a tolerant accession by drought stress. Transformation of MruGSTU39 in M. ruthenica and alfalfa (Medicago sativa) enhanced growth and survival of transgenic seedlings than their wild-type counterparts under drought. We demonstrated that MruGSTU39 can detoxify ROS to reduce its damage to membrane by up-regulating activities of GST and glutathione peroxidase. Our findings provide full-scale knowledge on GST family in the wild legume M. ruthenica with high tolerance to drought, and highlight improvement tolerance of legume forages to drought using genomic information of M. ruthenica.
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Data availability
The transcriptome data have been deposited in GenBank under accession PRJNA589938.
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Acknowledgements
We thank Dr. Hao Lin (Chinese Academy of Agricultural Sciences) for providing pFGC5941-Cas9 vector of Crispr/Cas9 system. We thank Dr. Mengyan Zhou (Novogene Bioinformatics Institute) for helping us perform the bioinformatics analysis. We thank Dr. Xiuzhi Xia (Chinese Academy of Agricultural Sciences) for providing the advice for hairy root transformation.
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The research was supported by the National Natural Science Foundation of China (32070351, 31830011) and the Science and Technology Program of Inner Mongolia, China (2021GG0372).
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TW conceived the research and designed the experiments. TW and DZ performed the experiments. TW, LC and JW analyzed the data. TW and WHZ wrote the manuscript. All authors discussed the results and approved the final manuscript.
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Wang, T., Zhang, D., Chen, L. et al. Genome-wide analysis of the Glutathione S-Transferase family in wild Medicago ruthenica and drought-tolerant breeding application of MruGSTU39 gene in cultivated alfalfa. Theor Appl Genet 135, 853–864 (2022). https://doi.org/10.1007/s00122-021-04002-x
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DOI: https://doi.org/10.1007/s00122-021-04002-x