What role does the nectar-producing disk play in Sapindales flowers?

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Sapindales Tangerine (*Citrus reticulata deliciosa*)

In the flowers of the order Sapindales, the nectar-producing disk is typically situated between the stamens and the pistil.1

The primary role of this disk is to secrete an abundance of nectar, which serves to attract insects to the flower. By drawing these animal visitors to the plant, the nectar facilitates the transfer of pollen, thereby promoting pollination.12