What is β–carotene doing in the photosystem II reaction centre?

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Singlet oxygen production in photosynthesis. (2004, background): “This possibility is given in the antenna system, but not in the reaction centre, although two b -carotene molecules are present in the PSII reaction centre (Telfer, 2002; for the location of the carotenes in the reaction centre, see Kamiya and Shen, 2003; Ferreira et al ., 2004).”
Production and Scavenging of Reactive Oxygen Species in Chloroplasts and Their Functions1 (2006, background): “In the reaction center core, two molecules of b-carotene participate in the quenching of 1O2 generated via 3P680*. Distance between b-carotene and P680 in PSII (Loll et al., 2005) does not allow the quenching of 3P680* by the b-carotene (for review, see Telfer, 2002).”
Exploitation of Dunaliella for β-carotene production (2007, background): “They protect the algae from damage obtained during excessive irradiances by preventing the formation of reactive oxygen species, by quenching the triplet-state chlorophyll or by reacting with singlet oxygen (1O2), and also, it acts as a light filter (Telfer 2002).”