Regulation of symbiotic interactions and primitive lichen differentiation by UMP1 MAP kinase in Umbilicaria muhlenbergii

Yanyan Wang, Rong Li, Diwen Wang, Ben Qian, Zhuyun Bian, Jiangchun Wei, Xinli Wei () and Jin-Rong Xu ()
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Yanyan Wang: Chinese Academy of Sciences
Rong Li: Chinese Academy of Sciences
Diwen Wang: Purdue University
Ben Qian: Chinese Academy of Sciences
Zhuyun Bian: Purdue University
Jiangchun Wei: Chinese Academy of Sciences
Xinli Wei: Chinese Academy of Sciences
Jin-Rong Xu: Purdue University

Nature Communications, 2023, vol. 14, issue 1, 1-13

Abstract: Abstract Lichens are of great ecological importance but mechanisms regulating lichen symbiosis are not clear. Umbilicaria muhlenbergii is a lichen-forming fungus amenable to molecular manipulations and dimorphic. Here, we established conditions conducive to symbiotic interactions and lichen differentiation and showed the importance of UMP1 MAP kinase in lichen development. In the initial biofilm-like symbiotic complexes, algal cells were interwoven with pseudohyphae covered with extracellular matrix. After longer incubation, fungal-algal complexes further differentiated into primitive lichen thalli with a melanized cortex-like and pseudoparenchyma-like tissues containing photoactive algal cells. Mutants deleted of UMP1 were blocked in pseudohyphal growth and development of biofilm-like complexes and primitive lichens. Invasion of dividing mother cells that contributes to algal layer organization in lichens was not observed in the ump1 mutant. Overall, these results showed regulatory roles of UMP1 in symbiotic interactions and lichen development and suitability of U. muhlenbergii as a model for studying lichen symbiosis.

Date: 2023
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DOI: 10.1038/s41467-023-42675-8

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