Developing disease-suppressive soils is an effective approach for managing soilborne diseases, which can be achieved through crop metabolism and root secretion modification to recruit beneficial soil microbiota. Many factors, such as light, can elicit and modify plant metabolomic activities, resulting in disease suppression. To investigate the impact of light, Panax notoginseng was planted in a greenhouse and forest, conditioned with three levels of light intensities, including the optimal (15% light transmittance of full light), suboptimal low (5% light transmittance of full light) and suboptimal high (30% light transmittance of full light) intensities. We assessed the rhizosphere microbiota of P. notoginseng and root rot disease caused by soilborne pathogen Ilyonectria destructans, and elucidated the mechanism. Results showed that suboptimal light conditions alleviated root rot disease of P. notoginseng by enriching beneficial microbiota in the rhizosphere. Both low and high light stresses enhanced the secondary metabolism profile in favor of plant defense, particularly the flavonoid pathway. Notably, high light stress demonstrated a robust ability to promote flavonoid metabolism and secretion, resulting in the enrichment of more beneficial microorganisms that suppressed the soilborne pathogen I. destructans. These findings highlight the potential for adjusting canopy light intensities to improve soil health and promote sustainable agriculture.

中文翻译：

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光胁迫引起三七根分泌的类黄酮介导的土壤传播疾病抑制


开发抑制病害的土壤是管理土壤传播疾病的有效方法，这可以通过作物新陈代谢和根系分泌物改造来招募有益的土壤微生物群来实现。许多因素，如光，可以引发和改变植物代谢组活性，从而抑制疾病。为了研究光的影响，三七种植在温室和森林中，以三个级别的光强度为调节，包括最佳（全光的 15% 透光率）、次优低（全光的 5% 透光率）和次优的高（全光的 30% 透光率）强度。本研究评估了三七根际微生物群和土传病原菌 Ilyonectria destructans 引起的根腐病，并阐明了其机制。结果表明，次优光照条件通过丰富根际有益微生物群来缓解三七根腐病。低光胁迫和高光胁迫都增强了次生代谢谱，有利于植物防御，尤其是类黄酮途径。值得注意的是，高光照胁迫表现出促进类黄酮代谢和分泌的强大能力，导致更多有益微生物的富集，从而抑制了土壤传播的病原体 I. destructans。这些发现突出了调整树冠光照强度以改善土壤健康和促进可持续农业的潜力。