Project description:We used RNA-seq to obtain a time course transcriptomics response on the liverwort Marchantia polymorpha as gemmae are released from dormancy and initiate germination. Dormant gemmae were collected from gemmae cups of adult thalli and subsequently subjected to different light treatments. Time point 0 was sampled without imbibition. All other samples were placed directly in 100 µl water for imbibition, keeping them wet throughout the sampling period. Imbibition for 1 to 12 hours was performed in constant light or constant darkness at 20°C. The imbibition process was interrupted by freezing the samples in liquid nitrogen after 1, 4, 8, and 12 hours. RNA-seq libraries were sequenced on single-read mode (101 bp) on an Illumina NovaSeq 6000 platform. There are two libraries per sample.
Project description:RNA was extracted from axenically grown Fo47 and Fol cultures and Marchantia polymorpha Tak1 thalli infected with these strains at 3DPI. There are 3 biological replicates in each set. Sequencing was carried out using NovaSeq 6000 platform using SP flowcell with 2x100bp sequencing read length.
Project description:21 DPI Marchantia polymorpha Tak-1 thalli were infected with Fol WT and erc3 knock out alongside mock(water) control and axenically grown Fol WT culture. At 3 days post infection, thalli were harvested and RNA was extracted. After polyA enrichment, and library preparation, sequencing was carried on NovaSeq6000 platform using SP flowcell with 2 x 100 bp read length.
Project description:Pattern-recognition receptor (PRR)-triggered immunity (PTI) plays a pivotal role in plant immunity to ward off a wide range of pathogenic microbes. The model liverwort Marchantia polymorpha is gaining popularity in investigating the evolution of plant-microbe interactions. The M. polymorpha is capable of triggering defense-related gene expression by sensing components in bacterial and fungal extracts, suggesting existence of PTI in this plant model. However, the molecular components that would form PTI in M. polymorpha have not yet been described. We show that, in M. polymorpha, lysin motif (LysM) receptor-like kinase (LYK) MpLYK1 and LYK-related (LYR) MpLYR, among four LysM receptor homologs, are required for sensing chitin and peptidoglycan (PGN) fragments and thereby triggering a series of immune responses. Phosphoproteomic analysis of M. polymorpha in response to chitin treatment comprehensively identified regulatory proteins that would shape LysM-mediated PTI. The identified proteins covered homologs of well-described PTI components in angiosperms as well as proteins whose roles in PTI are not yet determined including the blue-light receptor phototropin MpPHOT. We revealed that MpPHOT is required for a negative feedback of defense-related gene expression during PTI. Taken together, this study provides the basic framework of LysM-mediated PTI in M. polymorpha and demonstrates the utility of M. polymorpha as a plant model for discovering novel or fundamental molecular mechanisms underlying PRR-triggered immune signaling in plants.
Project description:Pattern-recognition receptor (PRR)-triggered immunity (PTI) plays a pivotal role in plant immunity to ward off a wide range of pathogenic microbes. The model liverwort Marchantia polymorpha is gaining popularity in investigating the evolution of plant-microbe interactions. The M. polymorpha is capable of triggering defense-related gene expression by sensing components in bacterial and fungal extracts, suggesting existence of PTI in this plant model. However, the molecular components that would form PTI in M. polymorpha have not yet been described. We show that, in M. polymorpha, lysin motif (LysM) receptor-like kinase (LYK) MpLYK1 and LYK-related (LYR) MpLYR, among four LysM receptor homologs, are required for sensing chitin and peptidoglycan (PGN) fragments and thereby triggering a series of immune responses. Phosphoproteomic analysis of M. polymorpha in response to chitin treatment comprehensively identified regulatory proteins that would shape LysM-mediated PTI. The identified proteins covered homologs of well-described PTI components in angiosperms as well as proteins whose roles in PTI are not yet determined including the blue-light receptor phototropin MpPHOT. We revealed that MpPHOT is required for a negative feedback of defense-related gene expression during PTI. Taken together, this study provides the basic framework of LysM-mediated PTI in M. polymorpha and demonstrates the utility of M. polymorpha as a plant model for discovering novel or fundamental molecular mechanisms underlying PRR-triggered immune signaling in plants.
Project description:Pattern-recognition receptor (PRR)-triggered immunity (PTI) plays a pivotal role in plant immunity to ward off a wide range of pathogenic microbes. The model liverwort Marchantia polymorpha is gaining popularity in investigating the evolution of plant-microbe interactions. The M. polymorpha is capable of triggering defense-related gene expression by sensing components in bacterial and fungal extracts, suggesting existence of PTI in this plant model. However, the molecular components that would form PTI in M. polymorpha have not yet been described. We show that, in M. polymorpha, lysin motif (LysM) receptor-like kinase (LYK) MpLYK1 and LYK-related (LYR) MpLYR, among four LysM receptor homologs, are required for sensing chitin and peptidoglycan (PGN) fragments and thereby triggering a series of immune responses. Phosphoproteomic analysis of M. polymorpha in response to chitin treatment comprehensively identified regulatory proteins that would shape LysM-mediated PTI. The identified proteins covered homologs of well-described PTI components in angiosperms as well as proteins whose roles in PTI are not yet determined including the blue-light receptor phototropin MpPHOT. We revealed that MpPHOT is required for a negative feedback of defense-related gene expression during PTI. Taken together, this study provides the basic framework of LysM-mediated PTI in M. polymorpha and demonstrates the utility of M. polymorpha as a plant model for discovering novel or fundamental molecular mechanisms underlying PRR-triggered immune signaling in plants.
Project description:In this study, we set to take advantage of Marchantias less complex signalling architecture to better understand how plants respond to environmental cues such as stress and time of the day, to modulate the expression of genes and biological pathways. To this end, we constructed an abiotic stress gene expression atlas of Marchantia comprising seven abiotic stresses (darkness, high light, cold, heat, nitrogen deficiency, salt, mannitol) and their pairwise combinations (e.g., cold + salt). We also measured gene expression at six timepoints of a day (12h light/ 12h darkness)
Project description:A blue-light receptor phototropin (phot) mediates chloroplast relocation responses. Upon receiving blue light, phot undergoes autophosphorylation via the serine/threonine kinase domain. The autophosphorylation levels of phot change in response to different blue-light intensities and temperature, and its level of autophosphorylation is associated with the induction of different types of chloroplast relocation responses. However, the phosphorylation sites of phot in the liverwort Marchantia polymorpha (Mpphot) is unknown. Here, we comprehensively surveyed serine and threonine residues as potential phosphorylation sites by using nano LC-MSMS and 23 phosphorylation sites and 18 candidates were identified.
Project description:In the present study, Marchantia polymorpha Mppcs loss of function mutants were generated through CRISPR/cas9 mediated genome-editing. To assess whether the knockout of MpPCS gene affects the transcription of M. polymorpha nuclear genes in unstressed condition, the Mppcs-2 knockout mutant and Cam2 wild-type transcriptomes were compared by RNA-Seq.
Project description:Plant cells are surrounded by an extracellular cell wall that shields them from their abiotic and biotic environment. To coordinate their growth with their cell wall status, they have developed cell wall integrity mechanisms at the center of which lies the transmembrane Malectin-like receptor kinase FERONIA (FER). FER controls a myriad of plant developmental processes including sexual reproduction, cell growth and morphogenesis, often intersecting with phytohormones-dependent pathways such as abscisic acid (ABA) or plant immunity. Interestingly, FER and its downstream receptor-like cytoplasmic kinase MARIS (MRI) were shown to cooperate similarly in the control of root hair and rhizoid integrity for the vascular model Arabidopsis and the early diverging bryophyte model Marchantia polymorpha, respectively. Here, we carried out comparative transcriptomics and proteomics approach on Mpfer-1 and Mpmri-1 knock-down mutant plants and the wild-type strains Tak-1 and Tak-2. Our -omics analyses revealed that globally, MpFER and MpMRI largely cooperate to negatively regulate transcriptional and translational networks in particular those related to plant defense and ABA responses. Moreover, Mpfer-1 plants were found to be hypersensitive to ABA-dependent growth inhibition indicating that FER’s function of negatively regulating ABA-related growth responses is conserved between bryophytes and vascular plants.