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Analysis on Biofertilization-Induced Memory Acquisition for Heat Stress Mitigation in Soybean Plants
Helena Chaves Tasca1, Douglas Antônio Posso1, Eugenia Jacira Bolacel Braga2
1Plant Cognition and Electrophysiology Laboratory, Federal University of Pelotas, Pelotas 96160-000, Brazil.
Plants (Basel, Switzerland)
|May 27, 2026
Summary
The Stress Memory Encoder biofertilizer primes soybean plants to better withstand heat stress. This seed treatment enhances plant resilience and adaptive responses to high-temperature episodes.
Area of Science:
- Agricultural Science
- Plant Physiology
- Biotechnology
Background:
- Climate change increases high-temperature episodes, threatening crop productivity.
- Plant stress priming can enhance resilience through metabolic adjustments and memory.
- Soybean (Glycine max) is vulnerable to heat stress during critical growth stages.
Purpose of the Study:
- To evaluate the efficacy of Stress Memory Encoder (SME) biofertilizer as a seed treatment.
- To determine SME's capacity to induce heat stress (HS) memory in soybean plants.
- To assess SME's impact on physiological and molecular responses to HS.
Main Methods:
- Soybean plants were treated with SME at varying doses (0, 2, 4 mL kg⁻¹) and exposed to HS (35°C for 48h) at V3 and V6 stages.
- Photosynthetic traits, reactive oxygen species (ROS), and lipid peroxidation were measured.
- Gene and transcript factor expression related to HS was analyzed in plants exposed to consecutive HS events.
Main Results:
- The 4 mL kg⁻¹ SME dose significantly improved photosynthetic traits and reduced oxidative stress markers under HS at the V6 stage.
- Non-enzymatic antioxidants increased with SME treatment at the V3 stage.
- SME-primed plants exhibited higher expression of HS-related genes and transcript factors, especially under consecutive HS exposure.
Conclusions:
- SME acts as a priming agent, inducing somatic memory in soybean plants.
- SME enhances adaptive physiological and molecular responses to heat stress.
- This biofertilizer shows potential for mitigating climate change impacts on soybean production.
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