Abstract:
:Phosphate (Pi) is a pivotal nutrient that constraints plant development and productivity in natural ecosystems. Land colonization by plants, more than 470 million years ago, evolved adaptive mechanisms to conquer Pi-scarce environments. However, little is known about the molecular basis underlying such adaptations at early branches of plant phylogeny. To shed light on how early divergent plants respond to Pi limitation, we analyzed the morpho-physiological and transcriptional dynamics of Marchantia polymorpha upon Pi starvation. Our phylogenomic analysis highlights some gene networks present since the Chlorophytes and others established in the Streptophytes (e.g., PHR1-SPX1 and STOP1-ALMT1, respectively). At the morpho-physiological level, the response is characterized by the induction of phosphatase activity, media acidification, accumulation of auronidins, reduction of internal Pi concentration, and developmental modifications of rhizoids. The transcriptional response involves the induction of MpPHR1, Pi transporters, lipid turnover enzymes, and MpMYB14, which is an essential transcription factor for auronidins biosynthesis. MpSTOP2 up-regulation correlates with expression changes in genes related to organic acid biosynthesis and transport, suggesting a preference for citrate exudation. An analysis of MpPHR1 binding sequences (P1BS) shows an enrichment of this cis regulatory element in differentially expressed genes. Our study unravels the strategies, at diverse levels of organization, exerted by M. polymorpha to cope with low Pi availability.
journal_name
Int J Mol Scijournal_title
International journal of molecular sciencesauthors
Rico-Reséndiz F,Cervantes-Pérez SA,Espinal-Centeno A,Dipp-Álvarez M,Oropeza-Aburto A,Hurtado-Bautista E,Cruz-Hernández A,Bowman JL,Ishizaki K,Arteaga-Vázquez MA,Herrera-Estrella L,Cruz-Ramírez Adoi
10.3390/ijms21218354subject
Has Abstractpub_date
2020-11-07 00:00:00issue
21issn
1422-0067pii
ijms21218354journal_volume
21pub_type
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