Table 2.
Overview of metal homeostasis genes identified in barley
| Gene superfamily | Subfamily | Common name | No. identified in barley databases | No. present on 22K Barley GeneChip |
| P-type ATPase | P1B-type ATPase | HMA | 10 | 4 |
| Zrt-, Irt-like Protein | ZIP | 8 | 8 | |
| Cation Diffusion Facilitator (CDF) | MTP | 12 | 4 | |
| Natural resistance associated macrophage proteins | Nramp | 4 | 3 | |
| Ca2+-sensitive cross-complementer 1 (CCC1) | Vacuolar iron transporter 1 | VIT1 | 2 | 2 |
| Major facilitator superfamily of membrane proteins | Zinc-Induced Facilitator1 | ZIF1 | 1 | 1 |
| Ca2+/cation antiporter (CaCA) | Cation exchanger | CAX | 3 | 3 |
| Oligopeptide transporter family | Yellow Stripe Like | YSL | 6 | 5 |
| Metallothionein | MT | 10 | 9 | |
| Nicotianamine synthase | NAS | 8 | 7 | |
| Nicotianamine aminotransferase | NAAT | 4 | 2 | |
| Total | 68 | 48 |