What role do humic acids play in enhancing plant stress resistance?
Release Date:
2019-11-11
We know that humic acid is beneficial to plants and can promote their growth—details of these effects are thoroughly outlined in promotional materials, so a quick look will make it clear. Beyond stimulating plant growth and improving soil quality, humic acid also enhances plants’ stress tolerance, enabling them to maintain normal growth even under adverse environmental conditions. Today, a leading humic acid manufacturer will explain in detail how humic acid contributes to plant stress resistance.
What role do humic acids play in enhancing plant stress tolerance?
We know that humic acid is beneficial to plants and can promote their growth—details of these benefits are thoroughly outlined in promotional materials, so anyone can easily see for themselves. Beyond stimulating plant growth and improving soil quality, it also enhances a plant’s stress tolerance, meaning it enables plants to continue growing normally even under adverse conditions. Today… Humic acid manufacturer Let’s now discuss in detail the role of humic acid in enhancing plant stress resistance.
1. Plant Drought Stress
Under drought conditions, the application of humic acid–containing fertilizers can enhance the accumulation of proline in plant leaves, thereby improving cellular water‑holding capacity. At the same time, it increases the activities of cellular protective enzymes—such as nitrate reductase, superoxide dismutase, and peroxidase—and reduces plasma membrane permeability, collectively enhancing crop drought tolerance.
2. Salt-Alkali Stress in Plants
Humic substances can indirectly enhance plant stress tolerance and resilience by improving the soil’s physicochemical properties. In addition, humic acids can modulate fructose concentrations, thereby alleviating plasma membrane damage under salt stress and bolstering salt tolerance.
3. Plant Temperature Stress
Under low-temperature stress, humic acid can enhance crop cold tolerance by increasing proline and abscisic acid levels, boosting polyphenol oxidase activity, and mitigating the extent of reductions in transpiration rate, stomatal conductance, and net photosynthetic rate following cold stress.
Under high-temperature stress, humic acid also exhibits favorable effects. The activities of superoxide dismutase and peroxidase in crops are enhanced, while the rate of superoxide anion production and the level of hydrogen peroxide are reduced, thereby improving the plants’ heat tolerance.
4. Heavy Metal Stress in Plants
Humic acids contain a variety of functional groups that, through complexation, chelation, and reduction, can immobilize heavy metals on the surfaces of soil particles, thereby influencing their mobility, reducing their water-soluble forms, and lowering their toxicity.
Meanwhile, humic acid can also alleviate the toxic effects of the heavy metal cadmium on seedlings, primarily by inhibiting cadmium uptake while promoting the absorption and accumulation of essential nutrients such as copper, zinc, iron, and manganese.
5. Plant Disease Resistance
Humic acids promote plant growth by increasing leaf sugar and chlorophyll levels, thereby indirectly enhancing crop resistance to diseases. Furthermore, studies have shown that sodium humate can inhibit the germination of downy mildew sporangia, and when combined with other pesticides, it can significantly reduce the incidence of downy mildew. In addition, humic substances can enhance control efficacy against root-knot nematodes.
Phytic acid, owing to its unique structure and functions, is widely used as an adjuvant in agrochemical formulations, and it has also been shown to exert beneficial effects on plant disease resistance.
That concludes our overview of humic acid’s role in enhancing plant stress resistance. We hope this information helps you gain a deeper understanding of humic acid. For more details, please feel free to contact us—we are here to serve you wholeheartedly.
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