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Polar auxin transport based on PIN1, PIN2, and PIN3 is light sensitive and involved in the light-induced negative phototropism of roots (Friml et al., 2002; Wan et al., 2012; Zhang et al., 2014). PIN1 is involved in the acropetal (rootward) auxin transport, PIN3 in the lateral auxin transport in statocytes, and PIN2 in the basipetal (shootward) auxin transport in epidermis and cortex cells. CC, central cylinder; En, endodermis; Co, cortex; Ep, epidermis.
