Low photosynthetic activity is linked to changes in the organization of photosystem II in the fruit of Arum italicum

► During maturation, the berry of Arum italicum develops a low photosynthetic activity. ► At the green stage, the thylakoid membrane hosts a very high amount of LHCII, but only few photosystems. ► Native PSII forms are similar to that of the leaf lamina, but PSII is less stable. ► The possible roles of LHCII excess in fruits are discussed.