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Conservation and divergence of UVR8 photoreceptor-mediated UV-B signaling in Marchantia polymorpha.

Liang Y, Podolec R, Chappuis R, Defossez E, Glauser G, Rötzer J, Stolze SC, Dolan L, Nakagami H, Demarsy E, Ulm R. · 2026 · Plant Physiology   research

doi:10.1093/plphys/kiag218   PMID:41985038

Linked genes (5)  5 core 0 peripheral

Gene ID	Name	Evidence / Role	Function (this paper)
Mp1g16800	MpBZIP1	experimental subject	Transcriptional regulator that functions antagonistically to MpCOP1, similar to Arabidopsis HY5/HYH, but with a more limited role in UV-B-mediated gene expression changes in Marchantia.
Mp5g12010	MpCOP1	experimental subject	E3 ubiquitin ligase; Mpcop1 mutants show a strong constitutive photomorphogenesis phenotype. COP1 function is much more independent of SPA in Marchantia than in Arabidopsis, and MpHY5 functions antagonistically to MpCOP1.
Mp2g18040	MpRUP	experimental subject	WD40-repeat protein, a key component of M. polymorpha UV-B signaling studied as part of the conserved core UVR8 photocycle.
Mp3g25460	MpSPA1	experimental subject	SPA component of the COP1/SPA complex; Mpspa mutants develop only a very weak constitutive photomorphogenesis phenotype but show enhanced UV-B acclimation and UV stress tolerance, indicating MpSPA is a negative regulator of MpUVR8 signaling.
Mp2g11590	MpUVR8	experimental subject	UV-B photoreceptor of M. polymorpha; the paper shows the core UVR8 photocycle is well conserved. MpSPA acts as a negative regulator of MpUVR8 signaling, with Mpspa showing enhanced UV-B acclimation and UV stress tolerance.