On St. John's Wort and Approaches to Promoting its Cultivation, Breeding, and Pharmaceutical Use

Beschreibung

St. John’s Wort (Hypericum perforatum) is one of the most economically valuable medicinal plants, with a reported annual demand of approximately 580 tons and a cultivation value of up to €9,000 per hectare. Along with Echinacea (Echinacea purpurea), it represents the highest economic yield among medicinal plants. This economic significance is primarily based on the evidence-based efficacy of its bioactive compounds, which serves as the foundation for the widespread use of St. John’s Wort preparations in modern medicine. However, challenges such as changing climatic conditions, economic fluctuations, and labor shortages are increasingly affecting cultivation. This highlights the urgent need to promote and further develop the cultivation of medicinal plants in Germany. To address these challenges, this study investigated various approaches aimed at ensuring the sustainable production of H. perforatum while exploring new applications with potential benefits for public health and economic value. The core of this work is a detailed phenotypic screening of various accessions of the genus Hypericum, focusing on H. perforatum, to identify genetic resources suitable for breeding. Particularly promising accessions were identified and exhibit advantageous characteristics across a range of traits. Given the necessity of continuous monitoring of valuable traits for digitized plant production, two "computer vision" models were successfully developed for plant and flower recognition. These tools enhance the capabilities for real-time monitoring and quantification of plant development in Hypericum spp. and help alleviate labor shortages in the selection process. To refine breeding objectives regarding secondary metabolites, the potential of H. perforatum extracts to reduce β-amyloid in Alzheimer’s models was also investigated. While various techniques for genetic manipulation have been adapted for many crop species, H. perforatum poses significant challenges for the application of established transformation techniques. To overcome these limitations, the applicability of cell-penetrating peptides (CPPs) was tested on in vitro cultures of H. perforatum and proved successful. This approach offers new perspectives for transient gene manipulation, particularly for plants with antimicrobial secondary metabolites, as it bypasses common issues such as the toxic effects on transformation systems. Furthermore, it holds potential for applications in stable transformation techniques and other biotechnological methods. The findings of this work make a significant contribution to expanding the scientific foundation of medicinal plant research. They also provide valuable perspectives and direct benefits for breeding programs, plant producers, and further scientific projects.

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Ahmed El Menuawy

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Arzneipflanzen Medizin Johanniskraut (Hypericum perforatum)

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