Nanoenabled Priming Helps Wheat to Handle Heat and Disease

Area of Science:

• Agricultural Science
• Nanotechnology
• Plant Pathology

Background:

• Climate change poses significant threats to global wheat production due to rising temperatures and increased pathogen virulence.
• Fusarium head blight (FHB) is a major disease impacting wheat yield and quality.
• Developing climate-resilient crops is crucial for food security.

Purpose of the Study:

• To develop and evaluate a nano-enabled seed priming strategy to simultaneously enhance wheat thermotolerance and resistance to FHB.
• To investigate the molecular mechanisms underlying the enhanced resilience conferred by nano-priming.
• To identify cost-effective and environmentally friendly nanomaterials for crop improvement.

Main Methods:

• Seed priming with silver and silicon dioxide nanoparticles (AgSiO2NPs) or copper and silicon dioxide nanoparticles (CuO@SiO2NPs).
• Assessment of physiological and biochemical responses under heat shock stress (45 °C).
• Evaluation of resistance against Fusarium graminearum infection under elevated temperatures (28 °C).
• Transcriptomic analysis (RNA-seq) to elucidate molecular pathways involved in stress response and disease resistance.

Main Results:

• AgSiO2NP-primed wheat seedlings showed reduced wilting, increased biomass (22.8%), improved water uptake, and maintained cellular integrity under heat stress.
• Nano-priming activated ROS-mediated signaling pathways, including plant hormone signal transduction and MAPK signaling, enhancing seedling heat resilience.
• Primed seedlings exhibited significantly enhanced resistance to Fusarium graminearum, even under warmer conditions.
• Transcriptomic data revealed intensified defense-related pathways, specialized metabolite biosynthesis, and robust immune activation in nano-primed seedlings post-infection.
• CuO@SiO2 nanoparticles provided an inexpensive ($0.5-2 per acre) and effective alternative for FHB resistance.

Conclusions:

• Nano-enabled seed priming is a promising nontransgenic approach to engineer climate-resilient wheat.
• The strategy effectively enhances both thermotolerance and FHB resistance by modulating key molecular signaling pathways.
• This sustainable method offers a viable solution to mitigate climate change impacts on wheat production and ensure food security.