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Table 3 Functional prediction of AAT genes in foxtail millet based on homology relationship, expression pattern and previous studies

From: Amino acid transporter (AAT) gene family in foxtail millet (Setaria italica L.): widespread family expansion, functional differentiation, roles in quality formation and response to abiotic stresses

Subfamilies AATs in foxtail millet expression organizationa Possible biological processes Previous studies
AAP SiAAP7; GS; The intake of amino acid in endosperm and embryo development; AtAAP8,1 [23, 58];
SiAAP1,5,13; R,ST; Amino acid absorption in root and transport in stems; AtAAP7,1 [19];
SiAAP2,10,9; GS,SP,G Play a role in early embryo development and formation of floral organs and grain quality; AtAAP8,1,VfAAP1,OsAAP6 [4, 6, 7];
SiAAP3,8,12,14 LS,LV, G Participate in the transport and distribution of amino acids in leaf and grain formation;  
SiAAP4,15,19,20 ST,LS,LV Participate in the transfer and distribution of amino acids from stems to leaf HvAAP3,AtAAP7 [25];AtAAP2,3,6,OsAAP8,15;HvAAP2,6 [8, 12, 20, 21]
GAT SiGAT3; LS,LV,L,SP Maintain cell ion balance under normal conditions; AtGAT1 [44]
SiGAT6 R,ST,LS,SP Amino acid absorption in root and long-distance transportation of GABA
ProT SiProT1 ST,L,GS Participate in the long-distance transport of proline and regulate the distribution of proline in leaf AtProT1,AtProT3 [5, 38]
LHT SiLHT11 R; Amino acid uptake in root; AtLHT1,9 [28, 59]
SiLHT2,5,10 L; Transport and distribution of amino acids in leaf;
SiLHT9 LS,ST,R Long-distance transportation of amino acids from root to leaf
AUX SiAUX1; ST,R; Participate in the geotropism of root and the transport of auxin in the stem; AtAUX1 [32,33,34];
SiAUX2,3,4; SP; G Participate in spikelet development and grain formation OsAUX1,StAUX [10, 12]
ANT SiANT1; ST,R,LS,LV; Participate in long-distance transportation of amino acids; AtANT1 [31]
SiANT2 SP,G,GS Participate in seed germination, spike differentiation and grain formation
ATLa SiATLa1; GS,SE; Participate in seed germination; NA
SiATLa3,4,5; ST,LS,LV,R,SP; Participate in long-distance transportation of amino acids;
SiATLa6 L,SP Regulate the distribution of amino acids in leaf and Participate in spike differentiation
ATLb SiATLb3,6,10,13; GS,SE,SP,G; Participate in seed germination, spike differentiation and grain formation; NA
SiATLb1; R,ST,LV; Long-distance transportation of amino acids from root to leaf;
SiATLb7; GS; Participate in seed germination;
SiATLb8; ST,LS,LV Long-distance transportation of amino acids from stem to leaf;
CAT SiCAT10 GS Participate in seed germination; NA
SiCAT3, 5, 6, 8, 9 GS, ST, R, L Participate in long-distance transportation of amino acids;
SiCAT7 SP Specific influence on spike differentiation;
SiCAT11, 12 SP, L Participate in spikelet formation and amino acid transport and distribution in leaves
ACT SiBAT1, 2, 7 ST, L, SP Participate in spikelet formation and long-distance transportation of amino acids NA
PHS SiLAT1, 2, 5 GS, SP, G; Participate in seed germination, spike differentiation and grain formation; NA
SiLAT3 GS, LS, LV, ST, R Participate in spikelet formation and long-distance transportation of amino acids
TTP SiTTP1 SE, SP Affect seedling growth and spikelet differentiation NA
  1. aGS Germinated seed, R Root, ST Stem, SP Spikelet, G Grain, SE Seedling, L Leaf, LV Leaf Vein, LS Leaf Sheath