Original title: Low temperature modulates spike development and yield via ABA pathway at post-reproductive transition stage in wheat
Ankui Liu, Siqi Wu, Sulaiman Saeed, Mengxin Wang +5 · August 2026
Wheat yields depend heavily on temperature, but scientists need to know how cold weather shapes grain development. Researchers combined field sowing tests with controlled-temperature experiments to study how low temperatures affect wheat spikes, the grain-bearing parts of the plant. They found that early sowing let plants switch to their reproductive stage before winter. This switch let spikelets develop for a longer time under cool conditions. Cold exposure after this reproductive transitionThe stage when a wheat plant shifts from growing leaves to forming the parts that become grain. works by altering plant hormones. Specifically, a hormone called abscisic acid, or ABA, acts as a control hub. It helps the plant defend against cold at 8 °C, balances growth at 16 °C, and drops at 22 °C to speed up reproduction. Overall, low temperatures after this transition delayed heading. However, this delay increased spike length, fertile spikelets, and grains per spike, revealing how cold boosts wheat yield potential.
You expect that a cold snap after your tomato plants start flowering will ruin the crop. But to your surprise, the cold snap actually leads to more fruit. In this paper, low temperature after wheat plants start forming their seed heads, not winter cold, boosts grain yield.
Wheat is a staple crop feeding billions. As global temperatures shift, knowing exactly when cold helps or hurts yield is crucial for farmers. This research reveals that cold after a key growth stage, not winter chill, can increase grain production, offering specific targets for breeding climate-resilient wheat and adjusting sowing times. This knowledge could lead to higher yields despite unpredictable weather, helping secure food supply for a growing population.
The abstract doesn't say. It presents the findings without discussing caveats, though the study is limited to specific temperature gradients and wheat varieties. Implications for other crops or field conditions remain unexplored.
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Low temperature modulates spike development and yield via ABA pathway at post-reproductive transition stage in wheat — Ankui Liu, Siqi Wu, Sulaiman Saeed et al. — aBIOTECH — doi:10.1016/j.abiote.2026.100086
Abstract licence: CC BY
Explanation generated by Synthesis from the abstract — it is not the original paper.