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All Journal Jurnal Florea
Susan Mambu
Universitas Sam Ratulangi
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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Physiological Profiling of Rhizosphere Microbial Communities in Sweet Potatoes Agustina Monalisa Tangapo; Susan Mambu; Roni Koneri; Marsia Tiara Pasassa; Jesslyn Rumengan
Florea : Jurnal Biologi dan Pembelajarannya Vol. 13 No. 2 (2026)
Publisher : UNIVERSITAS PGRI MADIUN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25273/florea.v13i2.24574

Abstract

This study investigated the temporal dynamics of sweet potato rhizosphere microbial communities across different growth phases to understand their functional metabolic shifts, which is critical for optimizing sustainable soil management. Rhizosphere soil samples were collected monthly (1 to 5 months) during the crop growth period. Community-Level Physiological Profiling (CLPP) was conducted using the Biolog EcoPlate approach combined with quantitative spectrophotometry analysis, with data evaluated through Average Well Color Development (AWCD), Shannon diversity (H’), and Evenness (E) indices. The results revealed a distict shift in microbial metabolic activity, which peaked at 2 months and gradually declined toward the harvesting phase at 5 months. Ecologically, the substrate utilization pattens shifted dynamically over time: early-stage microbial communities (1-2 months) predominantly utilized carbohydrates and polymers, reflecting the high energy demand and typical root exudates of young plants. Conversely, late-stage communities (3-5 months) transitioned toward amines and polymers, indicating an adaptation to more complex organic matter as the plant matured. This study demonstrates that sweet potato growth stages strongly drive rhizosphere microbial functional diversity. These insights offer an agricultural blueprint for the precise timing of biofertilizer applications aligned with the plant's natural metabolic windows.
Co-Authors Agustina Monalisa Tangapo Jesslyn Rumengan Marsia Tiara Pasassa Roni Koneri