Summary
This study investigates the allelopathic potential of aqueous extracts derived from leaves and roots of Paeonia ostii 'Fengdan' (tree peony) on three brassica-type vegetables — tatsoi, spinach, and bok choy — with the aim of evaluating the species' suitability as an intercropping companion plant. Results suggest a concentration-dependent response, whereby lower concentrations of root extracts promote germination and key physiological functions, whilst higher concentrations are likely inhibitory. Tatsoi demonstrated the greatest tolerance and responsiveness among the three vegetables tested, indicating species-specific compatibility in potential intercropping arrangements.
UK applicability
Tree peony is not widely grown as an arable or horticultural crop in the UK, and intercropping systems involving Paeonia ostii are largely absent from British farming practice. However, the findings may have broader relevance to UK research on allelopathy and companion planting in horticultural systems, particularly where novel or underutilised perennial species are being explored for integration into vegetable production.
Key measures
Seed germination rate (%); seedling biomass (g); chlorophyll content (mg/g); root activity; photosynthetic rate (μmol CO₂ m⁻² s⁻¹); intercellular CO₂ concentration; stomatal conductance; antioxidant enzyme activity
Outcomes reported
The study measured seed germination rates, seedling growth, biomass, chlorophyll content, root activity, photosynthetic parameters, and antioxidant enzyme activity in tatsoi, spinach, and bok choy exposed to aqueous extracts of tree peony leaves and roots at varying concentrations. It assessed whether tree peony (Paeonia ostii 'Fengdan') exerts stimulatory or inhibitory allelopathic effects depending on extract concentration and plant species.
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