AI Article Synopsis
- SUMOylation plays a significant role in plant responses to drought stress, with a complex interaction between SUMOylation and ubiquitination yet to be fully understood.
- In an experiment with apple plants, both increased and decreased SUMOylation improved drought tolerance, with transgenic plants overexpressing MdSUMO2A and those with MdSUMO2 RNAi showing enhanced survival rates.
- The study identified MdDREB2A as a key target of MdSUMO2, where SUMOylated MdDREB2A gets ubiquitinated by MdRNF4, ultimately leading to its degradation during drought conditions and highlighting the interconnected regulatory mechanisms governing drought stress responses.
Article Abstract
SUMOylation is involved in various aspects of plant biology, including drought stress. However, the relationship between SUMOylation and drought stress tolerance is complex; whether SUMOylation has a crosstalk with ubiquitination in response to drought stress remains largely unclear. In this study, we found that both increased and decreased SUMOylation led to increased survival of apple (Malus × domestica) under drought stress: both transgenic MdSUMO2A overexpressing (OE) plants and MdSUMO2 RNAi plants exhibited enhanced drought tolerance. We further confirmed that MdDREB2A is one of the MdSUMO2 targets. Both transgenic MdDREB2A OE and MdDREB2A OE plants (which lacked the key site of SUMOylation by MdSUMO2A) were more drought tolerant than wild-type plants. However, MdDREB2A OE plants had a much higher survival rate than MdDREB2A OE plants. We further showed SUMOylated MdDREB2A was conjugated with ubiquitin by MdRNF4 under drought stress, thereby triggering its protein degradation. In addition, MdRNF4 RNAi plants were more tolerant to drought stress. These results revealed the molecular mechanisms that underlie the relationship of SUMOylation with drought tolerance and provided evidence for the tight control of MdDREB2A accumulation under drought stress mediated by SUMOylation and ubiquitination.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9055824 | PMC |
| http://dx.doi.org/10.1111/pbi.13772 | DOI Listing |
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