Table 1 Summary of the substrates of plant NPF proteins

Arabidopsis

AtNPF1.1

NRT1.12

At3g16180

NPF1

NO₃ −[10]; ABA/GA_1/3/4/MeJA [18]

–

AtNPF1.2

NRT1.11

At1g52190

NPF1

NO₃⁻ [10]; GA_1/3/4/MeJA [18, 50]

–

AtNPF2.3

NAXT2

At3g45700

NPF2–2

GA_1/3/4 [18]; NO₃ −[51]

–

AtNPF2.4

At3g45690

NPF2–2

Chloride [21]; GA_1/3/4/MeJA [18]

ABA

AtNPF2.5

At3g45680

NPF2–2

ABA/GA_1/3/4 [18]; chloride [22]

–

AtNPF2.6

At3g45660

NPF2–2

GA_1/4/MeJA [18]

–

AtNPF2.7

NAXT1

At3g45650

NPF2–2

NO₃ −[52]; GA_1/3/4/MeJA [18]

–

AtNPF2.9

NRT1.9/GTR3

At1g18880

NPF2–1

NO₃ −[53]; 4MTB [20]

–

AtNPF2.10

GTR1

At3g47960

NPF2–1

NO₃⁻/4MTB [20]; 8MTO [47]; GA_1/3/4/MeJA [18, 54]

MeJA

AtNPF2.11

NRT1.10/GTR2

At5g62680

NPF2–1

NO₃⁻/4MTB [20]; 8MTO [47]; GA₃ [55]

–

AtNPF2.12

NRT1.6

At1g27080

NPF2–1

NO₃ −[56]; GA_1/3 [18]

–

AtNPF2.13

NRT1.7

At1g69870

NPF2–1

NO₃ −[57]; 4MTB [20]; GA_1/3/4/MeJA [18]

–

AtNPF2.14

At1g69860

NPF2–1

4MTB [20]

–

AtNPF3.1

Nitr

At1g68570

NPF3

NO₃⁻/NO₂ −[12]; ABA/GA_1/3/4/8/20/MeJA [18, 50, 55]

ABA; GA

AtNPF4.1

AIT3

At3g25260

NPF4

ABA [39]; GA_1/3/4/MeJA [18, 54]; GA_3/4/8/20 [55]

–

AtNPF4.2

AIT4

At3g25280

NPF4

GA_1/3 [18]; ABA [17, 58]

–

AtNPF4.5

AIT2

At1g27040

NPF4

ABA [17, 18, 58]

–

AtNPF4.6

NRT1.2/AIT1

At1g69850

NPF4

NO₃ −[59]; ABA [17, 18, 58]

–

AtNPF5.1

At2g40460

NPF5–1

ABA/GA_1/3/4/MeJA [18]

–

AtNPF5.2

PTR3

At5g46050

NPF5–1

ABA/GA_1/3/4 [9]; di-peptides [60]

SA; MeJA; ABA

AtNPF5.3

At5g46040

NPF5–1

ABA [18]

–

AtNPF5.5

At2g38100

NPF5–2

NO₃ −[61]

–

AtNPF5.6

At2g37900

NPF5–1

GA_1/4 [18]

–

AtNPF5.7

At3g53960

NPF5–1

ABA/GA_1/3/4/MeJA [18]

–

AtNPF5.10

At1g22540

NPF5–1

NO₃ −[61]

–

AtNPF6.2

NRT1.4

At2g26690

NPF6–1

NO₃ −[62]

–

AtNPF6.3

NRT1.1/CHL1

At1g12110

NPF6–1

NO₃ −[6]; IAA [19]

IAA

AtNPF7.2

NRT1.8

At4g21680

NPF7

NO₃ −[53]

–

AtNPF7.3

NRT1.5

At1g32450

NPF7

NO₃ −[53]; K⁺ [23]

–

AtNPF8.1

PTR1

At3g54140

NPF8

di-peptides [13, 14]; MeJA [18]

–

AtNPF8.2

PTR5

At5g01180

NPF8

di-peptides [14]

–

AtNPF8.3

PTR2/NTR1

At2g02040

NPF8

di-peptides [15, 16]; histidine [63]

–

O.sativa

OsNPF2.2

OsPTR2

Os12g44100

NPF2–1

NO₃ −[64]

–

OsNPF2.4

Os03g48180

NPF2–1

NO₃ −[65]

–

OsNPF7.2

Os02g47090

NPF7

NO₃ −[66]

–

OsNPF8.9

OsNRT1

Os03g13274

NPF8

NO₃ −[67]

–

Z. mays

ZmNPF6.4

GRMZM2G086496_P01

NPF6–1

chloride/ NO₃ −[11]

–

ZmNPF6.6

GRMZM2G161459_P02

NPF6–1

NO₃ −[11]

–

C. roseus

CrNPF2.9

KX372303

NPF2–1

Alkaloid [49]

–

V.vinifera

VvNPF3.2

GSVIVT01025795001

NPF3

NO₃⁻/NO₂ −[12]

–

C. sativus

CsNPF3.2

CsNitr1

Cucsa.337560.1

NPF3

NO₂ −[68]

–

M. truncatula

MtNPF1.7

NIP/LATD

Medtr1g009200

NPF1

NO₃ −[69]

–

MtNPF6.8

MtNRT1.3

Medtr5g085850

NPF6–1

NO₃ −[70]

–