Seed priming with microalgae enhances plant productivity and rhizosphere health
摘要
Priming of dwarf pea seeds with microalgal strains significantly enhanced plant growth Rhizosphere health also improved upon priming of seeds with microalgal strains Microalgae boost soil health, C/N content, EPS, IAA, and DHA in soils Plant growth and rhizosphere health improvements due to priming are soil-specific
Microalgae play a key role as primary colonizers of soil, enhancing plant growth and improving soil health. Seed priming is a widely used method to improve seedling performance, counteract soil-related stresses, and boost plant productivity. Here we investigated the impact of priming dwarf pea seeds with live cells or disrupted cell mass of two microalgae, Desmodesmus sp. MAS1 and Heterochlorella sp. MAS3, on plant growth response and rhizosphere health. Plant growth metrics, rhizosphere health parameters, and nutrient status indicators were investigated 21 days after sowing in two different soils (designated as A and B) with varying pH. Results revealed that priming significantly improved the biochemistry of rhizosphere in soil B (pH 8), with over 30% increases in leaf count and fresh weight compared to soil A (pH 6). While flowering rates remained low, priming with strain MAS1 significantly enhanced chlorophyll (20%), indole-3-acetic acid (61%), and dehydrogenase activity (50%). Furthermore, strain MAS1 boosted nutrient availability in the rhizosphere, with a 30%–60% increase in carbon and nitrogen levels, promoting exopolysaccharide release. Our findings thus demonstrate the potential of seed priming with microalgae in modulating rhizosphere health, thereby enhancing plant growth and productivity.