Wheat gene found that works against its own drought defenses
Wang K, Zhao D, Zhang T, Jin M, Wang C
Crop Improvement
If you've ever watched a lawn or garden bed crisp up during a dry spell, this research points toward crops bred to simply dial down a gene that's been sabotaging their own drought defenses.
Researchers discovered a gene in wheat, TaPSP1, that normally gets in the way of the plant's drought defenses instead of helping. When they boosted the gene's activity, wheat plants wilted faster and suffered more cell damage under dry conditions. But when they silenced it, the plants held onto water better, built up more protective compounds, and survived drought stress much better, suggesting plant breeders could target this gene to create tougher wheat varieties.
Key Findings
TaPSP1 encodes a peroxiredoxin-like, plasma membrane-associated protein whose transcript levels decline under PEG-induced osmotic stress.
Overexpressing TaPSP1 in both Arabidopsis and wheat reduced biomass, survival rates, relative water content, and proline accumulation while raising malondialdehyde (a marker of cell damage) under osmotic stress.
RNAi knockdown of TaPSP1 in wheat significantly improved osmotic stress tolerance, boosting survival and proline levels while lowering malondialdehyde content, and transcriptomics showed TaPSP1 overexpression suppresses defense-related gene pathways.
chevron_right Technical Summary
Scientists found a wheat gene called TaPSP1 that actually makes plants worse at handling drought-like stress. Turning the gene down made wheat tougher and more drought-tolerant, pointing to a new breeding target for hardier crops.
Abstract Preview
Original paper
TaPSP1 negatively regulates osmotic stress response in wheat.
Wheat (Triticum aestivum L.) is a cornerstone of global food security, yet its production is severely threatened by osmotic stress, such as drought-induced water deficit. Identifying and characteri...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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Wheat is a group of wild and domesticated grasses of the genus Triticum. As cereals, they are cultivated for their grains, which are staple foods around the world. Well-known wheat species and hybrids include the most widely grown common wheat, spelt, durum, emmer, einkorn, and Khorasan or Kamut....