Figure 8.

OsFTIP1-Mediated Regulation of RFT1 Transport Is Negatively Regulated by OsUbDKγ4 in Rice.

OsFTIP1 is required for RFT1 export from companion cells to sieve elements in rice leaves under LDs and affects RFT1 transport to the SAM for further regulating other genes involved in floral meristem development, such as OsMADS14 and OsMADS15. OsUbDKγ4 interacts with OsFTIP1 and mediates OsFTIP1 degradation in leaves. This contributes to modulation of RFT1 trafficking from leaves to the SAM, thus regulating flowering time in rice under LDs. Red arrows indicate RFT1 transport, while black arrows indicate various promotive effects. Dotted arrow indicates the regulation of OsFTIP1 abundance.