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Table 2
- Regulation of Potassium Transport in Leaves: from Molecular to Tissue Level

Examples of K⁺ transporters, their functions and intracellular location in leaves of various plant species

Class	Genes	Species	Expression inleaves	Intracellularlocation	Physiological function	Reference
KUP/HAK/KTtransporters	McHAK1	Ice plant	Mesophyll	Plasmalemma	High (?) affinity K⁺ uptake	Su et al. (2002)
			Epidermis	Plasmalemma
	McHAK4	Ice plant	Mesophyll	Plasmalemma	High (?) affinity K⁺ uptake	Su et al. (2002)
			Epidermis	Plasmalemma
	OsHAK10	Rice	Epidermis	Tonoplast	K⁺ efflux from vacuole underK⁺ deficiency	Banuelos et al. (2002)
	HvHAK1	Barley	Phloem	Plasmalemma	High (?) affinity K⁺ uptake	Su et al. (2002)
HKT transporters	OsHKT1	Rice	Mesophyll	Plasmalemma	High-affinity K⁺ loading	Golldack et al. (2002)
	HKT1	Wheat	Vascular tissue	Plasmalemma	Xylem unloading	Schachtman (2000)
H⁺/Na⁺(K⁺)antiporter	AtNHX1	Arabidopsis	Epidermis	Tonoplast	K⁺ efflux from vacuole underK⁺ deficiency	Blumwald et al. (2000)
			Mesophyll

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