Microneedle-Based Biofertilizer Delivery Improves Plant Growth Through Microbiome Engineering

Advanced Functional Materials
2025.09.13

Author: Zhicheng Le, Sevugan Mayalagu, Cheng-Yen Chen, Raktim Bhattacharya, Abhishek Gupta, Jingyuan Li, Zhi Wei Norman Teo, Yufeng Shou, Arya Gopinath MP, Danni Zhong, Tedrick Thomas Salim Lew, Hao Yu, Naweed I. Naqvi, Sanjay Swarup, Andy Tay

Citation: Le, Zhicheng, et al. "Microneedle‐Based Biofertilizer Delivery Improves Plant Growth Through Microbiome Engineering." Advanced Functional Materials (2025): e22554.

Abstract:

https://advanced.onlinelibrary.wiley.com/doi/full/10.1002/adfm.202522554

This study presents a microneedle-based system for the delivery of rhizospheric biofertilizers into plant tissues to enhance growth. The microneedle structures are customizable to match leaf and stem dimensions to minimize tissue perturbation at delivery sites. The dissolving microneedles loading plant growth-promoting rhizobacteria (PGPR) or fungi ensures rapid biofertilizer release within one minute, while the integration of an applicator facilitates user-friendly injections. It is demonstrated that microneedle-mediated delivery of biofertilizers into plant leaves and stems enhances Choy Sum and Kale growth more efficiently while requiring over 15% less biofertilizer quantity than traditional root inoculation. Microneedle-mediated delivery of PGPR induces broad metabolic reprogramming, influencing energy production, biosynthesis, and amino acid metabolism. This effect is attributed to PGPR migration within the leaf and subsequent translocation to the roots, leading to shifts in root microbial composition at both the phylum and genus levels. Similarly, microneedles deliver beneficial.