Metabolic adaptations of Qingke: A review of stress resilience and nutritional functions

Qingke, a staple crop grown on the high-altitude Tibetan Plateau, has evolved a metabolomic profile providing both environmental stress resilience and human nutrition. We review the hypothesis that the metabolites that confer cold and UV resistance on the crop also facilitate human adaptation to high-altitude stresses. Specifically, β-glucans regulate blood glucose primarily via short-chain fatty acids (SCFAs) produced through gut microbiota fermentation, which directly mediate glucose homeostasis. Phenolamides accumulate via the phenylpropanoid pathway, with chalcone isomerase (CHI) serving as a key enzyme in flavonoid biosynthesis and enhancing UV-B resistance. Under low temperatures, β-glucans improve frost tolerance by modulating osmotic balance and inhibiting ice-nucleating proteins, while lipids maintain membrane fluidity to sustain cellular function during cold stress. Importantly, we explore the hypothesis that these same metabolites, upon consumption, may facilitate human adaptation to high-altitude stresses. This hypothesis is supported by preliminary epidemiological associations between Qingke consumption and favorable health outcomes in high-altitude populations, as well as established bioactivities of the implicated metabolites in vitro and in animal models. However, direct causal evidence in humans and a comprehensive understanding of the underlying molecular mechanisms remain key knowledge gaps that warrant future investigation. Qingke as a unique resource at the interface of agricultural resilience and human nutrition. Understanding its metabolic blueprint will inform the development of functional foods and climate-resilient crops.