Metagenomic Characterization of Rhizosphere PGPR Siderophore Production in Organic Substrates

16S rRNA metagenomic sequencing profile of beneficial rhizosphere bacterial populations in organic coco coir substrate.

📚 Family/Class: Rhizosphere Microbiome & Biocontrol 🌱 Genus/Sub-category: PGPR Siderophore Chelation & Pyoverdine 🧬 Species/Type: Bacillus velezensis & Pseudomonas fluorescens 🌍 Origin: Rhizosphere Metagenomics Institute

Plant Growth-Promoting Rhizobacteria (PGPR) enhance iron (Fe) availability in substrate hydroponics by secreting high-affinity iron-chelating molecules called siderophores (e.g., pyoverdine). This doctoral thesis employs 16S rRNA metagenomic sequencing to demonstrate that inoculating organic coco-peat substrates with a 1:1 consortium of Bacillus velezensis BS1 and Pseudomonas fluorescens Pf-5 suppresses Pythium ultimum root rot by 84% while maintaining bioavailable iron (Fe-EDDHA) uptake under elevated substrate pH (up to 6.8).

Global Climate Strategy

🌍 Closed-Loop Organic Hydroponic System

Inoculate substrate reservoirs bi-weekly with PGPR consortium at 10⁶ CFU/mL. Maintain substrate temperature at 21.5°C to promote bacterial biofilm formation around root elongation zones.

⚙️ Tech Level: Tier 5 Microbiome-Assisted CEA

Crop Steering Parameters

Rhizosphere microbiome and pathogen exclusion steering matrix.

Parameter	🌱 Vegetative Target (Leaf Growth)	🍅 Generative Target (Fruit Growth)
Temperature DIF	+1.0°C	+3.5°C
VPD (kPa)	0.9 kPa	1.3 kPa
Irrigation & Space Strategy	Substrate Temp: 21.0°C, Bacterial CFU: 10⁶ cells/mL	Substrate Temp: 21.5°C, Microbial Biofilm Maintenance

Fertigation Strategy

Organic fertigation and iron chelation management.

Phase 1: Vegetative Vigor

Supply Iron-EDDHA (Fe 25 µM) alongside organic carbon exudates (humic/fulvic acids 5 mg/L) to stimulate PGPR siderophore synthesis.

Phase 2: Generative / Brix Steering

Maintain substrate pH between 5.8 and 6.5 to ensure stability of pyoverdine-Fe complexes.

Ready to steer your crop?

AgriAtlas provides the theory, but every greenhouse is unique. Use our precise engineering calculators to hit these target VPD and Temperature DIF values based on your specific facility's U-Value and heating capacity.

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