Cold storage triggers a hidden sweetening switch in kiwifruit
Li A, Meng Y, Chen X, Zeng Z, Zhao Z
Crop Improvement
The kiwifruit sitting in your fridge crisper is running its own temperature sensor, and understanding it could mean less mealy, over-softened fruit and longer-lasting produce at the store.
Kiwifruit ripen partly because of ethylene gas, but growers who use that gas often end up with fruit that turns mushy too quickly. Researchers discovered that cool temperatures, like those in a fridge, switch on a specific protein that protects another protein from being broken down, and that surviving protein then flips on the genes that convert starch into sugar. It's essentially a built-in cold thermometer that ripens fruit from the inside without needing an artificial ripening gas.
Key Findings
A cool-temperature (5-10°C) pathway drives starch-to-sugar conversion in kiwifruit even when ethylene signaling is blocked by 1-MCP
The transcription factor AcCTS1 activates two beta-amylase genes (AcBAM3.3 and AcBAM3.5) that break down starch, confirmed via luciferase, EMSA, and yeast one-hybrid assays
An E3 ubiquitin ligase, AcPUB11, degrades AcCTS1 at room temperature but its abundance drops under cool storage, allowing AcCTS1 to accumulate and trigger ripening
chevron_right Technical Summary
Scientists found the genetic switch that lets kiwifruit sense cold storage temperatures and convert their starch into sugar, a discovery that could help growers ripen fruit perfectly without relying on ethylene gas that often makes fruit mushy too fast.
Abstract Preview
Original paper
A cool temperature-induced ubiquitination-controlled transcription factor promotes starch degradation and ripening in kiwifruit.
Ripening of kiwifruit (Actinidia spp.) is highly sensitive to ethylene, but reliance on exogenous ethylene often results in over-softening, greatly reducing shelf life. Here, we discovered a pathwa...
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