Table 2.

Transporters involved in the acquisition and inter-organ transport of Zn, Cd, and Fe in rice plants.

Site	Zn	Cd	Fe
Acquisition at root cell membranes	OsIRT1 1; OsZIP4,5 2	OsNRAMP5 3; OsIRT1/OsIRT2 4	OsYSL15 5; OsIRT1/OsIRT2 6
Vacuolar import through the tonoplast in root cells	(ZIF1) 7	OsHMA3 8
Xylem loading at root pericycle cells	OsHMA2 9	OsHMA2 5,9
Xylem-to-phloem transport at nodes	OsHMA2 10	OsHMA2 10	OsYSL16 11
Phloem loading after mobilization in leaves	ZIP and YSL families		OYSL15 12
Phloem unloading at reproductive organs			OsYSL18 13

¹ Lee and An [18]; ² White and Broadley [4]; ³ Ishikawa et al. [19], Sasaki et al. [20]; ⁴ Nakanishi et al. [21]; ⁵ Inoue et al. [22]; ⁶ Ishimaru et al. [23]; ⁷ Haydon et al. [24]; ⁸ Ueno et al. [25]; ⁹ Nocito et al. [26], Takahashi et al. [27]; ¹⁰ Yamaji et al. [28]; ¹¹ Kakei et al. [29]; ¹² Lee et al. [30]; ¹³ Aoyama et al. [31].