Table 3.
Comparative expression and response of MGT genes in horticultural crops.
| Crop Name | Gene/Transporter | Tissue Expression | Key Findings | Reference |
|---|---|---|---|---|
| Cucumber (Cucumis sativus) |
CsMGT1, CsMGT2, CsMGT3, CsMGT5, CsMGT6 | High expression in flowers; CsMGT3 high in fruit pulp and peels | Essential for Mg2+ transport, tissue-specific expression | Bin et al., 2023 |
| Tea (Camellia sinensis) |
CsMGT1, CsMGT2, CsMGT2.1, CsMGT3 | Expressed in roots, stems, leaves, and flowers | CsMGT1 and CsMGT2 have Mg2+ transport function; CsMGT1 better than CsMGT2 | Bin et al., 2023 |
| Tomato (Solanum lycopersicum) |
SlMGT3-2, SlMGT5-2, SlMGT4-1, SlMGT1-1, SlMGT2-1, SlMGT3-1, SlMGT5-1 | Varies by gene; e.g., SlMGT4-1 is dominant in leaves and flowers | Different family members regulate plant growth and physiological metabolism | Liu et al., 2023 |
| Grape (Vitis vinifera) |
VvMGT3, VvMGT6 | VvMGT3 in pollen and rachis PFS; VvMGT6 low in tissue senescence and organs | Tissue-specific and spatiotemporal expression; VvMGT3 might participate in pollen and peel signal transduction | Ge M. et al., 2022 |
| Citrus (Citrus spp.) |
CsMGT3, CsMGT5 | CsMGT3 high in fruit pulp and peels | Tissue-specific expression suggests diverse roles in development and growth | Bin et al., 2023 |
| Potato (Solanum tuberosum) |
DEGs (Differentially Expressed Genes) | leaves and tubers | Mg2+O NPs inhibit P. infestans, attenuating potato late blight, while promoting potential disease resistance and growth in potatoes. | Wang et al., 2022 |
| Apple (Malus domestica) |
MdSOT1, MdSOT3, MdSUT1, MdSUT4, MdCHS, MdF3H, MdMYB1, MdbZIP44 | Leaves, fruit stalk, fruit flesh, apple peel | Mg2+ application enhances N and C metabolism, promotes photosynthesis, boosts sugar transport to fruits, and increases anthocyanin content in apple peel. | Tian et al., 2023b |
| longan (Dimocarpus) |
DlMGT9.2 | High in fruit; low in flowers and leaves | Specific Mg2+ transport function | Lv et al., 2023 |
| Strawberry (Fragaria pentaphylla) |
CHLI, CHLD, CHLH | Leaves | Mutation in CHLI Glu186 affects chlorophyll biosynthesis and ATPase activity, leading to yellow-green leaves and alterations in nitrogen and carbon metabolism. | (Ma et al., 2023) |
| Pepper (Capsicum annuum) |
WRKY1, bZIP | Shoots and Roots | nMg2+ and bMg2+ enhance biomass accumulation and upregulate expression of WRKY1 and bZIP transcription factors involved in defense/stress responses and secondary metabolism. | Sotoodehnia-Korani et al., 2023 |
| Cucumber (Cucumis sativus) |
MSR2 (Csa_2G225310, Csa_2G19910, Csa_7G070800) & NIPAs (Csa_7G291140, Csa_5G586580, Csa_3G251940) | High in shoot tissues | MSR2 gene, Csa_2G225310, upregulated in response to nematode; NIPA, Csa_3G129750, and MSR2, Csa_1G138280, upregulated under NaCl stress; NIPA, Csa_4G646200, upregulated 1 dai by PC | (Heidari et al., 2022) |
| Watermelon (Citrullus lanatus) |
NIPAs (Cla97C05G083800, Cla97C03G063010, Cla97C02G031120) & MSR2 (Cla97C02G033950) | High in roots; MSR2 (Cla97C02G033950) across all tissues | Two NIPAs upregulated under drought and mosaic virus stress; further NIPA genes induced in response to melatonin treatment and under low nitrogen content in leaves | (Heidari et al., 2022) |