The promotion effect of mineral humic acid on plant growth is not only reflected in the growth of plant roots and the absorption of nutrients by the roots, but also shows a certain promotion effect on the growth of the above-ground parts of plants.
Researchers moved one-week-old rapeseed seedlings into Hoagland nutrient solution containing mineral humic acid (organic carbon 100 mg/L) for culture, and measured genes related to carbon, nitrogen and sulfur transformation in plant roots and aboveground parts. , found that compared with the treatment without adding mineral humic acid, when mineral humic acid was treated for 3 days, the number of differentially expressed genes in the aboveground parts was 720, which was twice that of the roots (366); and after 30 days of application, the number of differentially expressed genes in the aboveground parts was 720 Several genes showed differential expression, but no differential expression was detected among the genes in the root system.
Nitrate reductase, asparagine synthase, citrate synthase, isocitrate dehydrogenase and malate dehydrogenase are important enzymes involved in nitrogen conversion and transport and organic acid synthesis in corn leaves. Mineral humic acid It can stimulate the expression of its encoding genes, thereby promoting nitrogen absorption and amino acid metabolism of corn, thereby promoting its growth. Mineral humic acid can also promote plant growth by inducing the expression of important enzymes (benzylalanine deaminase and tyrosine ammonia lyase) genes involved in secondary metabolism in corn leaves.
Research experiments have shown that different concentrations of mineral humic acid can promote the growth of cucumber above ground. This effect has also been confirmed on wheat, corn and pepper. The mechanism of this effect may be the effect of mineral humic acid on root H+-ATP. The influence of enzyme activity and nitrate distribution in the roots and shoots will cause changes in the distribution of certain cellular kinins, peptides and abscisic acid in the roots and shoots, thereby affecting shoot growth.
In summary, mineral humic acid also has a good promoting effect on the growth of above-ground parts of plants, and it can be regarded as a high-quality plant growth promoter.