Biofertilizer-Enhanced Cultivation of Cryptolepis sanguinolenta for Root Development and Cryptolepine Yield Optimization

Overview

This research program advances the domestication and cultivation of Cryptolepis sanguinolenta (CS), a medicinal plant valued for its cryptolepine content and broad therapeutic properties including antimalarial, antimicrobial, antimycobacterial, and antihyperglycemic effects. The work investigates how nitrogen- and phosphorus-based biofertilizers can enhance root biomass and cryptolepine yield, while also evaluating the above-ground plant material as a potential biopesticide against root-knot nematodes and Fusarium spp. affecting tomato crops.

The program addresses two complementary opportunities: improving the productivity of a high-value medicinal crop through sustainable biofertilization, and repurposing agricultural byproducts (stems and leaves) as natural biocontrol agents. This dual focus offers both pharmaceutical and agricultural value chains an integrated, sustainable production approach.

Technical specifications

Cultivation and biofertilization approach:

• Seeds of Cryptolepis sanguinolenta are sown and transplanted onto raised beds under five fertilizer treatments: control, urea, nitrogen-fixing biofertilizer (Azotobacter), phosphorus-solubilizing biofertilizer (PSB), and a combined nitrogen- and phosphorus-promoting biofertilizer
• Trials arranged in randomized complete block design (RCBD) and assessed for biomass and cryptolepine yield over a 1-year period
• HPLC-based quantification of cryptolepine levels to measure active ingredient accumulation

Prior findings informing the work:

• A year-long field study on 600 CS plants using nested analysis identified 9-month-old plants as containing the highest active ingredient levels
• Inorganic nitrogen fertilization significantly promoted below-ground biomass and cryptolepine yield compared to unfertilized controls
• Phosphorus fertilization increased cryptolepine yield and above-ground biomass
• CS plants showed minimal pest and disease pressure under field conditions, supporting investigation of above-ground extracts as biocontrol agents

Biopesticide evaluation:

• Hydroethanolic and methanolic extracts from above-ground CS parts will be screened for antifungal activity against Fusarium spp. and nematicidal activity against root-knot nematodes in tomato

Technology readiness level

The biofertilizer optimization component is at an early-to-mid validation stage, building on established domestication protocols and prior field validation with inorganic fertilizers. The biopesticide application of above-ground biomass is at an early exploratory stage, with laboratory screening planned for antifungal and nematicidal efficacy. The program requires funding for biofertilizer inputs and materials for extraction and quantification of active ingredients.