PJB-2026-29
EFFCTS OF PERILLA STRAW FERMENTATION EXTRACT ON SEED GERMINATION AND SEEDLING GROWTH OF THREE FIELD CROPS
XUYING WANG
Abstract
The disposal of medicinal plant residues represents a significant challenge of resource waste and environmental pollution. Perilla frutescens stalk ferment extract (PFSE), rich in bioactive compounds, can be transformed through fermentation into a plant biostimulant (PFSE), yet its dose-response relationships and species-specific effects on major grain crops remain poorly understood. This study aimed to identify the optimal PFSE concentration and compare species-specific responses in pea, maize, and wheat. Results revealed a common "low-promotion, high-inhibition" pattern. Germination was significantly suppressed at 20 g/L in pea and maize, whereas wheat was less affected. Seedling morphology and root activity were optimal at 5～10 g/L and 3～5 g/L, respectively. Physiological responses varied by crop: chlorophyll content peaked at 5 g/L in maize and pea, and at 3 g/L or 1 g/L in wheat. Proline increased at 5 g/L in all species, while soluble sugars and proteins showed distinct concentration optima. Antioxidant enzymes (SOD, CAT, POD) and malondialdehyde (MDA) levels exhibited concentration-dependent trends, with oxidative damage increasing at high PFSE levels. We conclude that 5 g/L PFSE is the optimal dose for growth promotion, with sensitivity following the order: pea > maize > wheat. These results support PFSE as an effective bio-fertilizer and highlight a sustainable approach to utilizing Perilla straw.
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