Marine and terrestrial biostimulant elicitors of tolerance to cold stress

EVA REGINA OLIVEIRA ^1* Aline Nunes ² Felipe de Souza Dutra ³ Gadiel Zilto Azevedo ¹ Alex Ricardo Schneider ³ Beatriz Rocha dos Santos ¹ Deise Munaro ³ Sidnei Moura ³ Giuseppina Pace Pereira Lima ² Marcelo Maraschin ^1*

• ¹ Federal University of Santa Catarina, Florianopolis, Brazil
• ² São Paulo State University, São Paulo, São Paulo, Brazil
• ³ University of Caxias do Sul, Caxias do Sul, Rio Grande do Sul, Brazil

The increasing frequency of adverse environmental events, driven by ongoing climate change, has intensified the search for new technological alternatives in crop production and plant protection. Thermal stress can limit plant adaptation and negatively impact metabolism, physiology, morphology, and yield. Cold stress in plants has been extensively studied and can affect various stages of plant’s life cycle, from seed formation to development, causing damage to cell membranes, impairing cell division, and disrupting water absorption. Consequently, researchers have focused on mitigating the impacts of abiotic stress by investigating bioactive molecules and biostimulants derived from various organisms, which enhance tolerance mechanisms in plants. In aquatic environments, macro- and microalgae have emerged as key sources of plant elicitors, providing extractable molecules such as polysaccharides, polyamines, polyphenols, and amino acids that enhance plant defense responses. Similarly, certain terrestrial plants have shown potential as sources of biostimulant compounds. Thus, this study aims to highlight advancements in crop systems by emphasizing the potential of algae-based and terrestrial biostimulant elicitors in enhancing tolerance to cold stress. Ultimately, the goal is to improve understanding of promising biological models for food production, fostering innovative developments that can contribute to economically and ecologically sustainable technologies.