Significant energy transfer from CpcG2-phycobilisomes to photosystem I in the cyanobacterium Synechococcus sp. PCC 7002 in the absence of ApcD-dependent state transitions

► CpcG2-phycobilisome contributes to absorption cross-section of photosystem I. ► Energy transfer from CpcG1- and CpcG2-phycobilisome to photosystem I is independent to each other. ► Growth rates decreased significantly in cpcG2 mutant in the absence of ApcD-dependent state transitions. ► CpcG2 anchors phycobilisome to thylakoid membrane.