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Possible role of small secreted peptides (SSPs) in immune signaling in bryophytes

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Abstract

Plants utilize a plethora of peptide signals to regulate their immune response. Peptide ligands and their cognate receptors involved in immune signaling share common motifs among many species of vascular plants. However, the origin and evolution of immune peptides is still poorly understood. Here, we searched for genes encoding small secreted peptides in the genomes of three bryophyte lineages—mosses, liverworts and hornworts—that occupy a critical position in the study of land plant evolution. We found that bryophytes shared common predicted small secreted peptides (SSPs) with vascular plants. The number of SSPs is higher in the genomes of mosses than in both the liverwort Marchantia polymorpha and the hornwort Anthoceros sp. The synthetic peptide elicitors—AtPEP and StPEP—specific for vascular plants, triggered ROS production in the protonema of the moss Physcomitrella patens, suggesting the possibility of recognizing peptide ligands from angiosperms by moss receptors. Mass spectrometry analysis of the moss Physcomitrella patens, both the wild type and the Δcerk mutant secretomes, revealed peptides that specifically responded to chitosan treatment, suggesting their role in immune signaling.

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Data Availability

All data generated or analyzed during this study are included in the manuscript. The mass spectrometry data have been deposited to the ProteomeXchange Consortium via the PRIDE (Perez-Riverol et al. 2019) partner repository with the dataset identifier PXD021721.

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Funding

This work was funded by the Russian Science Foundation (Project No. 17-14-01189).

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Contributions

IL, AF, IF wrote the manuscript. IL, AF conducted all experiments, performed bioinformatic search for SSP candidates and contributed to data analysis. AM, EM and OP contributed to ROS accumulation analysis. OI performed bioinformatic search for homologes of receptor-like kinases. SK, RZ conducted mass-spectrometry analysis. VL and IL conducted peptide synthesis. IF performed data analysis. IF and VI designed and supervised the study.

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Correspondence to Igor Fesenko.

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Lyapina, I., Filippova, A., Kovalchuk, S. et al. Possible role of small secreted peptides (SSPs) in immune signaling in bryophytes. Plant Mol Biol 106, 123–143 (2021). https://doi.org/10.1007/s11103-021-01133-z

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  • DOI: https://doi.org/10.1007/s11103-021-01133-z

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