Biostimulants encompass a diverse range of bio-based organic and inorganic compounds, natural extracts (e.g. plant and seaweed extracts), humic substances, protein hydrolysates, nanomaterials, or substances with a plant growth promoting effect (e.g. peptides, amino acids, phytohormones, and other metabolites), as well as beneficial microorganisms (e.g. mycorrhizal and non-mycorrhizal fungi, and plant growth promoting rhizobacteria). Accordingly, they can be categorized into non-microbial and microbial biostimulants. When applied to plants or the rhizosphere, biostimulants have been reported to improve nutrient uptake by the roots and mobilization within the plants, water use efficiency, tolerance to abiotic stress, bioaccumulation of metabolites of interest, and crop productivity. For these reasons, they represent a promising approach to enhance sustainable agriculture and reduce the environmental impact of cropping systems.
Ongoing research in this field is crucial to understand the complex interactions between biostimulants, microorganisms and plants amidst a dynamic external environment, develop novel biostimulant formulations for specific agroecosystems, and optimize the application and integration of biostimulants in sustainable agricultural practices. By revealing the long-term effects of biostimulants on soil health, microbial biodiversity and ecosystem services, the use of biostimulants can help establishing resilient and environment friendly agricultural systems.
In support of UN Sustainable Development Goals SDG 2 (Zero Hunger) and SDG 15 (Life on Land), BMC Plant Biology launches the collection, Biostimulants in sustainable agriculture. This collection seeks to gather research investigating the applications and mechanisms of action of biostimulants in sustainable agriculture, as well as their relevance in the context of global food security and environmental sustainability. We invite researchers and experts in the field to submit research articles that explore, but are not limited to, the following topics:
- Effects of microbial and/or non-microbial biostimulants on plant physiology, vegetative growth and development, or other parameters
- The role and applications of beneficial microorganisms, including bacteria (plant growth-promoting rhizobacteria) and fungi (arbuscular mycorrhizal fungi), as biostimulants in sustainable agriculture
- The role and applications of non-microbial biostimulants (e.g. biochar, protein hydrolysates, humic substances and humic and fulvic acids, free amino acids, chitin and chitosan derivatives, and plant and seaweed extracts) in sustainable agriculture
- The role and applications of biostimulants to enhance abiotic stress tolerance
- Development of novel biostimulant formulations, including synergistic mixtures of these biostimulants, to improve plant growth and resilience to stress
- The role of plant biostimulants in improving soil chemistry, fertility and microbiome diversity
- Long-term effects of biostimulants on soil health, microbial biodiversity and agroecosystem services
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