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PVA-based microneedle systems for precise molecular delivery in plants.

Mingzhuo Li1, Aditi Dey Poonam1, Deepjyoti Singh2

  • 1Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC 27695, USA.

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Researchers developed a novel polyvinyl alcohol (PVA)-based microneedle (MN) system for efficient plant molecular delivery. This cost-effective technology enhances plant immunity and productivity while reducing agrochemical use.

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microneedlepathogen resistancephytohormoneplant deliveryprecision agriculture

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Area of Science:

  • Plant Science
  • Biotechnology
  • Agricultural Engineering

Background:

  • Conventional crop delivery methods (foliar spray, soil application) suffer from nutrient loss, environmental concerns, and low efficiency.
  • Nanomaterial-based delivery systems show promise but face challenges in synthesis, stability, and biosafety regulations.
  • There is a need for simpler, cost-effective, and safer plant molecular delivery systems.

Purpose of the Study:

  • To develop and evaluate a polyvinyl alcohol (PVA)-based microneedle (MN) system for efficient and precise delivery of small molecules into plant tissues.
  • To compare the delivery efficiency and application dose of the MN system with traditional methods.
  • To demonstrate the potential of the MN system for plant immunity engineering and precision agriculture.

Main Methods:

  • Fabrication of PVA-based microneedles (MNs) for plant tissue application.
  • Delivery of various small molecules (fluorescent dyes, growth promoters, salicylic acid) into plant tissues (stem, petiole, lateral branch).
  • Assessment of tissue accumulation, application dose reduction, and plant stress response.
  • Evaluation of MN-delivered salicylic acid (SA) for inducing resistance against tomato spotted wilt virus (TSWV) in Nicotiana benthamiana.

Main Results:

  • The PVA-MN system achieved 3.5x higher tissue accumulation compared to conventional methods.
  • Application dose was reduced by over 90% using the MN system.
  • The MN system facilitated the delivery of diverse small molecules with limited wounding stress.
  • Salicylic acid (SA) delivered via MNs induced resistance to TSWV in plants, demonstrating potential for plant immunity engineering.

Conclusions:

  • The easily fabricated and cost-effective PVA-MN system offers a superior alternative for plant molecular delivery.
  • This technology enhances plant health and productivity through efficient delivery and reduced agrochemical usage.
  • The MN system presents a promising tool for precision agriculture and non-gene editing plant immunity engineering.