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Manganese homeostasis is essential for the proper functioning of photosynthesis in Marchantia polymorpha

​A team from I2BC shows, by using super-resolution fluorescence microscopy and transmission electron microscopy approaches, that both excess and deficiency of Mn affect the organization of thylakoid membranes and photosynthetic electron transport in the plant Marchantia polymorpha. M polymorpha, due to its simple morphology, turns out to be an interesting model for the study of metal homeostasis by new analytical methods.

Published on 20 April 2023

​Manganese (Mn) is an essential metal for plant growth. It plays a major role in the chloroplast, in the photosynthetic chain of Photosystem II where it forms a cluster Mn4CaO5, which catalyzes the oxidation of water. Mn deficiency affects photosynthesis while its excess is toxic.
In order to understand the role of Mn in the structure and function of the photosynthetic apparatus, the researchers studied the effects of variations in its concentration in the model plant Marchantia polymorpha. They show that both an excess and a deficiency of Mn disorganize the thylakoid membrane (cell membrane inside the chloroplast, seat of photosynthesis) and affect the transport of photosynthetic electrons.

For more information, see the news on the I2BC website

Contact : Anja Krieger ;

Legend : M polymorpha in culture in increasing concentrations of Mn (top); Microscopic observation of chloroplasts at different Mn concentrations (bottom) © Messant et al., Plant Physiol. 2023 

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