DEVELOPMENT AND EVALUATION OF A MULTILAYER METHYLCELLULOSE-BASED POLYMER COATING FOR CONTROLLED DELIVERY OF FUSICOCCIN ON SOYBEAN SEEDS

The effectiveness of phytohormone application is largely limited by their rapid degradation, uneven distribution on the seed surface, and the lack of control over their release during germination. In this study, a multilayer polymer coating based on methylcellulose was developed and investigated for the controlled delivery of the phytohormone fusicoccin (FC) to soybean seeds using a mineral filler (talc) and a polysaccharide filler (potato starch). The physicochemical properties of the coatings, application uniformity, degradation kinetics, and release of the active compound under different temperature and humidity conditions were evaluated. The methylcellulose-talc compositions exhibited higher mechanical stability, lower swelling tendency, and longer degradation time compared with starch-based systems. The release of FC followed first-order kinetics, with a rate constant of 0.025 h⁻¹ and a half-life of 27.8 h. The obtained results confirm the potential of the developed methylcellulose-talc coatings for the prolonged and controlled delivery of phytohormones in seed pre-sowing treatment technologies. In the future, these findings may be used in further studies of polymer coatings under seed germination conditions.

1. Seeds: Physiology of Development / J.D. Bewley et al // Germination and Dormancy. 3rd ed. – New York: Springer, 2013. – 392 p.

2. Finch-Savage W.E. Seed vigour and crop establishment: extending performance beyond adaptation / W.E. Finch-Savage, G.W. Bassel // Journal of Experimental Botany. – 2016. – Vol. 67, № 3. – P. 567-591. https://doi.org/10.1093/jxb/erv490.

3. Growth stimulating and fungicidal properties of succinic acid complexes with silver, copper and boron ions during pre-sowing treatment of soybean seeds / S.K. Kabdrakhmanova et al // Engineered Science. – 2023. – Vol. 26. – Art. 973. https://doi.org/10.30919/es973.

4. Kapsulirovanie semyan maslichnykh kul'tur kak bezopasnaya sistema primeneniya sredstv zashchity rastenii / A.K. Kabdrakhmanova i dr. // Vestnik NYATs RK. – 2023. – № 3. – S. 111-120. https://doi.org/10.52676/1729-7885-2023-3-111-120. (In Rгssian).

5. Seed coating technology: an innovative and sustainable approach for improving seed quality and crop performance / T. Javed et al // Journal of the Saudi Society of Agricultural Sciences. – 2022. – Vol. 21, № 8. – P. 536-545. https://doi.org/10.1016/j.jssas.2022.03.003.

6. Marrè E. Fusicoccin: a tool in plant physiology / E. Marrè // Annual Review of Plant Physiology. – 1979. – Vol. 30. – P. 273-288. https://doi.org/10.1146/annurev.pp.30.060179.001421.

7. Phytohormones and Plant Growth Regulators – A Review / C.E. Agudelo-Morales et al // Journal of Science with Technological Applications. – 2021. – Vol. 10. – P. 27-65. https://doi.org/10.34294/j.jsta.21.10.66.

8. Oxidized starch/CMC based biofilm: synthesis and characterization / K. Akatan et al // Physical Sciences and Technology. – 2024. – Vol. 11, № 1-2. – P. 58-63. https://doi.org/10.26577/phst2024v11i1a7.

9. Synthesis of Cellulose Based Hydrogel With High Absorption Capacity / K. Akatan et al // International Journal of Biology and Chemistry. – 2025. – Vol. 18, № 1. – P. 150-158. https://doi.org/10.26577/IJBCh202518115.

10. Synthesis and Application of Biodegradable Cellulose Hydrogels From Sunflower Husks as a Water-Retaining Material in Agriculture / A. Battalova et al // Journal of Polymer Science. – 2025. – Vol. 63, № 24. – P. 5402-5413. https://doi.org/10.1002/pol.20240486.

11. Cellulose based materials for controlled release formulations of agrochemicals: a review of modifications and applications / L. Pang et al // Journal of Controlled Release. – 2019. – Vol. 316. – P. 187-199. https://doi.org/10.1016/j.jconrel.2019.11.004.

12. Mechanisms of solute release from porous hydrophilic polymers / R.W. Korsmeyer et al // International Journal of Pharmaceutics. – 1983. – Vol. 15, № 1. – P. 25-35. https://doi.org/10.1016/0378-5173(83)90064-9.