Table 1.
Overview of published evidence on expansin role in abiotic stress response.
| Gene | Plant species | Abiotic stress | Change in gene activity and/or the stress response | References |
|---|---|---|---|---|
| TaEXPA2 | Nicotiana tabacum | Drought | Triticum aestivum EXPA2 OE enhanced tolerance, increase in seed production | Chen et al. (2016) |
| TaEXPA2 | Triticum aestivum | Drought | OE enhanced tolerance, RNAi—increased sensitivity | Yang et al. (2020) |
| 29 EXPA, 9 EXLA, 2 EXPB | Camellia sinensis | Drought | The expression levels of 16 expansins were high | Bordoloi et al. (2021) |
| CplEXP1, CplEXP2, CplEXP3 | Craterostigma plantagineum | Drought | Increase in transcript levels of Craterostigma plantagineum EXP1 | Jones and McQueen-Mason (2004) |
| EaEXPA1, SoEXPA1, ShEXPA1 | Erianthus arundinaceus | Drought | High expression of Erianthus arundinaceus EXPA1 | Narayan et al. (2019) |
| EaEXPA1 | Saccharum spp. hybrid | Drought | OE enhanced tolerance | Narayan et al. (2021) |
| ZmEXP1, ZmEXP5 | Zea mays | Drought | Increased transcript levels | Wu et al. (2001) |
| NtEXPA4 | Nicotiana tabacum | Drought, salt | OE enhanced tolerance, RNAi—increased sensitivity | Chen et al., (2018a) |
| NtEXPA11 | Nicotiana tabacum | Drought, salt | OE enhanced tolerance | Marowa et al. (2020) |
| RhEXPA4 | Arabidopsis thaliana | Drought, salt | Rosa hybrida EXPA4 OE enhanced tolerance | Lu et al. (2013) |
| AnEXPA1, AnEXPA2 | Arabidopsis thaliana | Drought, cold | Ammopiptanthus nanus EXPAs OE enhanced tolerance | Liu et al. (2019) |
| AstEXPA1 | Nicotiana tabacum | Drought, salt, heat, cold | Agrostis stolonifera EXPA1 OE enhanced tolerance | Hao et al. (2017) |
| PttEXPA8 | Nicotiana tabacum | Drought, salt, heat, cold, cadmium | Populus tomentosa EXPA8 OE enhanced tolerance | Zhang et al. (2019b) |
| TaEXPA2 | Nicotiana tabacum | Salt | Triticum aestivum EXPA2 OE enhanced tolerance | Chen et al. (2017) |
| AtEXP2 | Arabidopsis thaliana | Salt, osmotic stress | exp2 increased sensitivity, Arabidopsis thaliana EXP2 OE enhanced tolerance | Yan et al. (2014) |
| AsEXP1 | Agrostis scabra, Agrostis stolonifera | Heat | The expression level of Agrostis scabra EXP1 was highly upregulated in shoots | Xu et al. (2007) |
| PpEXP1 | Nicotiana tabacum | Heat | Poa pratensis EXP1 OE enhanced tolerance | Xu et al. (2014) |
| TaEXPAs | Triticum aestivum | Cold | Differential expression could be related to low-temperature tolerance or sensitivity | Zhang et al. (2018a) |
| TaEXPA8 | Arabidopsis thaliana | Cold, drought | TaEXPA8 genes were induced by low-temperature and drought TaEXPA8 genes were induced by low-temperature and drought Triticum aestivum EXPA8 OE enhanced low-temperature tolerance | Peng et al. (2019) |
| PtoEXPA12 | Nicotiana tabacum | Cadmium | Populus tomentosa EXPA12 OE enhanced Cd uptake and led to Cd toxicity | Zhang, et al. (2018b) |
| TaEXPA2 | Nicotiana tabacum | Cadmium | Triticum aestivum EXPA2 OE enhanced tolerance | Ren et al. (2018) |
| TaEXPA2 AtEXPA2 | Triticum aestivum, Arabidopsis thaliana | H2O2 (oxidative stress) | The expression level of TaEXPA2 was upregulated, Triticum aestivum EXPA2 OE enhanced tolerance | Chen et al. (2018b) |
Note: TaEXPA8 genes were induced by low-temperature and drought.