Growth, Distribution and Quality of Gastrodia Elata: Combined Effects ofEnvironmental Factors, Soil Microorganisms, Symbiotic Fungi and ProcessingMethods

Gastrodia elata Bl. (G. elata)—a heterotrophic orchid with high medicinal value— faces sustainability challenges due to its ecological specificity. This review highlights critical factors governing its cultivation: optimal growth occurs at 20–25°C, 60–80% humidity, and 1,400– 1,800 m altitude, where temperature-humidity gradients shape biomass and bioactive compound synthesis. Genetic diversity is driven by environmental heterogeneity, with high-altitude populations adapting to climatic stress, while lowland cultivation risks genetic erosion. Soil microbiomes, particularly symbiotic Armillaria mellea (Armillaria), enable nutrient acquisition but degrade under monoculture, necessitating microbial diversity restoration via organic amendments. Post-harvest processing significantly impacts medicinal quality: steaming and Ultra-High-Pressure (UHP) methods preserve neuroprotective gastrodin and parishins, whereas sulfur fumigation introduces toxic residues. To ensure sustainability, we propose integrating climate-resilient breeding, microbiome engineering, and standardized processing. These strategies address environmental, genetic, and technological bottlenecks, positioning G. elata as a sustainable resource for global medicinal applications.