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Related Concept Videos

Responses to Salt Stress02:02

Responses to Salt Stress

Salt stress—which can be triggered by high salt concentrations in a plant’s environment—can significantly affect plant growth and crop production by influencing photosynthesis and the absorption of water and nutrients.
Adaptations that Reduce Water Loss01:57

Adaptations that Reduce Water Loss

Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
Responses to Drought and Flooding02:41

Responses to Drought and Flooding

Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.
The Roles of Bacteria and Fungi in Plant Nutrition02:11

The Roles of Bacteria and Fungi in Plant Nutrition

Plants have the impressive ability to create their own food through photosynthesis. However, plants often require assistance from organisms in the soil to acquire the nutrients they need to function correctly. Both bacteria and fungi have evolved symbiotic relationships with plants that help the species to thrive in a wide variety of environments.
Responses to Heat and Cold Stress02:45

Responses to Heat and Cold Stress

Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.
Soil Microbial Ecology01:29

Soil Microbial Ecology

Soil microbial ecology is defined by highly diverse, spatially structured communities that drive nutrient cycling, organic matter turnover, and overall ecosystem stability. Although a gram of soil can contain thousands of bacterial and archaeal taxa, the ecological processes they mediate are even more crucial for sustaining terrestrial life.Microhabitats and NichesSoil is a heterogeneous mixture of minerals, organic matter, water, and air. Microbes inhabit distinct microhabitats formed by...

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Related Experiment Video

Updated: Jun 18, 2026

High Throughput Image-Based Phenotyping for Determining Morphological and Physiological Responses to Single and Combined Stresses in Potato
06:28

High Throughput Image-Based Phenotyping for Determining Morphological and Physiological Responses to Single and Combined Stresses in Potato

Published on: June 7, 2024

Humic substances for abiotic stress resilience: current knowledge and perspectives.

Hajar Salehi1, Davide Savy2, Maria Antonietta Rao2

  • 1Department for Sustainable Food Process, Università Cattolica del Sacro Cuore, Via Emilia Parmense 84, Piacenza, 29122, Italy.

Plant Physiology and Biochemistry : PPB
|June 16, 2026
PubMed
Summary

Humic substances (HS) improve plant resilience to abiotic stress, but their effectiveness varies. Research shows HS impact plant membranes and ion transport, yet clear structure-activity links and standardized reporting are lacking.

Keywords:
Abiotic stress toleranceChemical-biological interactionsHumic substancesPlant growthSustainable agriculture

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Hydroponics: A Versatile System to Study Nutrient Allocation and Plant Responses to Nutrient Availability and Exposure to Toxic Elements
09:13

Hydroponics: A Versatile System to Study Nutrient Allocation and Plant Responses to Nutrient Availability and Exposure to Toxic Elements

Published on: July 13, 2016

Related Experiment Videos

Last Updated: Jun 18, 2026

High Throughput Image-Based Phenotyping for Determining Morphological and Physiological Responses to Single and Combined Stresses in Potato
06:28

High Throughput Image-Based Phenotyping for Determining Morphological and Physiological Responses to Single and Combined Stresses in Potato

Published on: June 7, 2024

Hydroponics: A Versatile System to Study Nutrient Allocation and Plant Responses to Nutrient Availability and Exposure to Toxic Elements
09:13

Hydroponics: A Versatile System to Study Nutrient Allocation and Plant Responses to Nutrient Availability and Exposure to Toxic Elements

Published on: July 13, 2016

Area of Science:

  • Agricultural Science
  • Plant Physiology
  • Soil Science

Background:

  • Humic substances (HS) are widely used biostimulants to enhance plant abiotic stress tolerance.
  • Their efficacy is inconsistent due to variations in source, composition, dose, and experimental setup.

Purpose of the Study:

  • To review scientific studies on HS application for plant abiotic stress.
  • To analyze the mode of action of HS based on recent research (2021-2025).
  • To identify gaps in current research regarding HS characterization and application.

Main Methods:

  • Literature review of studies on humic substances and abiotic stress in plants.
  • Analysis of recent research (2021-2025) focusing on the mode of action of HS.
  • Synthesis of findings on HS chemical properties, plant responses, and stress conditions.

Main Results:

  • HS influence plasma membrane function, ion transport, and redox balance.
  • HS biological activity is linked to chemical characteristics like aromaticity and functional groups, but a predictive relationship is not established.
  • Recent studies show insufficient reporting of HS characterization, dose normalization, and biological effects.

Conclusions:

  • Standardized HS characterization and dosage recommendations are crucial for consistent results.
  • Further research using high-throughput omics is needed to elucidate HS mode of action.
  • Linking HS chemical properties to root-soil interactions and stress responses at multiple scales is essential.