Dual Gene Knockout Improves Potato Storage Quality and Shelf Life
Researchers used CRISPR/Cas9 genome editing to knock out two genes in potato — StAMY23 and StVINV — producing plants with extended dormancy, higher starch content, and reduced cold-induced sweetening during storage. Cold-induced sweetening is a major quality problem in stored potatoes, causing sugar accumulation that leads to undesirable browning during processing. The findings suggest a precision breeding strategy that could significantly improve potato storage quality for both industrial and consumer applications.
A study published on bioRxiv reports that simultaneous knockout of two potato genes — StAMY23, which encodes an alpha-amylase involved in starch breakdown, and StVINV, a vacuolar invertase — additively improves multiple postharvest storage traits in Solanum tuberosum. Single knockout of StAMY23 alone increased yield and extended tuber endodormancy without meaningfully affecting cold-induced sweetening or starch granule content. However, combining the StAMY23 knockout with an existing StVINV knockout background produced double-mutant lines that showed significantly reduced cold-induced sweetening, prolonged endodormancy, elevated starch content, and altered starch granule composition. Cold-induced sweetening — the accumulation of reducing sugars in potatoes stored at low temperatures — is a longstanding challenge for the potato processing industry, as it causes browning and off-flavors in chips and fries. The researchers conclude that targeting both starch degradation and sugar metabolism pathways through CRISPR/Cas9 offers a promising, precise approach to engineering superior storage characteristics in potato without relying on conventional breeding timelines.
What's missing
As a preprint, this study has not yet undergone peer review, so findings should be treated as preliminary. The study does not report data on field-scale performance, environmental interactions, or regulatory status of the edited lines across different growing regions. Long-term storage trials under commercial conditions and assessments of any unintended off-target editing effects are not described. The authors also do not address consumer or regulatory acceptance of CRISPR-edited potato varieties in key markets.
What different sources said
- bioRxivCenter
Dual Knockout of StAMY23 and StVINV Improves Postharvest Storage Traits in Potato
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