Prof. Xu Cao's team at the Institute of Genetics and Developmental Biology of the Chinese Academy of Sciences has cracked one of agriculture's most pressing challenges: how to shield crops from killer cold snaps without draining their energy during normal growing seasons.
The problem is deceptively simple but devastatingly consequential. When a sudden frost strikes during flowering—a critical window lasting just days—pollen dies in the anthers, and the harvest collapses. Cold snaps can slash yields of staple crops by 20% to 60%, a threat that intensifies as global climate instability triggers increasingly erratic temperature swings. Yet traditional breeding for continuous cold resilience backfires: plants that defend against cold at all times waste precious energy even when temperatures are mild and stable, ultimately reducing harvests during favorable seasons.
The breakthrough, published in Nature in 2026, pivots toward what researchers call "on-demand" climate resilience—a molecular switch that remains dormant under normal conditions but activates instantly when cold threatens.
Using multi-omics, gene editing, and artificial intelligence, the team identified the RGF gene, long marked as "function unknown" in the tomato genome. It encodes just 13 amino acids—a tiny peptide that stays silent during warm weather but sharply activates in anther tapetal cells the moment cold stress arrives during the tetrad stage of pollen development. This stress-responsive silence explains why the gene had eluded researchers for years: it only shows its hand when plants need it most.
When cold triggers RGF activation, an elegant molecular cascade unfolds. The RGF peptide is recognized by the cell-membrane receptor kinase SlRGFR6 and co-receptor SlSERK, which phosphorylate and activate cyclic nucleotide-gated ion channels SlCNGC16/18. This activation drives a rapid calcium influx into cells, orchestrating the programmed cell death of the anther tapetum. Counter-intuitively, this controlled death is essential—it ensures the tapetum degrades on schedule to release nutrients and energy directly to developing pollen, preventing cold-induced pollen abortion before it can happen.
The real-world impact is striking. Multi-year, multi-site field trials showed that moderately activating this RGF signaling axis recovered 33.9% to 52.2% of yield losses in tomatoes exposed to cold stress. In rice, upregulating RGF in commercial cultivars salvaged roughly 18% of yield losses during cold shocks. Nature's reviewers hailed the study as "an outstanding achievement and a significant breakthrough in the field of cold tolerance research," praising its seamless connection between mechanistic insight and agronomic reality.
The findings carry enormous implications for global food security. The RGF signaling axis is highly conserved across both dicots and monocots—meaning the strategy works across diverse crop families. Researchers are already expanding trials to soybeans and maize, two staples that feed billions. In a warming world where climate chaos is the only certainty, plants that can toggle resilience on demand may be the difference between harvest and hunger.
For the first time, breeders have a genetic lever to build climate-ready crops without sacrificing yields when conditions favor growth. That shift from passive, continuous defense to precise, stress-responsive protection could reshape global agriculture.