The latest research proposed a new point of view about the material composition of so-called 'humic substances,' isolated from natural objects (soils, peats, sapropels, and composts) by alkaline solutions, and presented the conceptual model of direct influence of 'humic substances' on biochemical and biophysical processes into plants. 'Humic substances' are essentially black liquor, i.e., a product artificially obtained because of the alkaline hydrolysis of organic material from natural objects. Black liquor consists of a complex mixture of a variety of organic compounds. According to the proposed model, the biological activity of black liquor connects with accelerating the circulation of nutrients within plants, increasing the permeability of cell membranes, exhibiting de-toxicological properties, optimizing the ratio of organic and mineral anions in plants, and using some HS components as organic nutrients, inducing gene expression. Therefore, humic substances solutions have multifaceted effects on green vascular plants due to their direct influence on biochemical and biophysical processes.
The latest study proposed a new look into the nutrition of higher green plants as a base for a brief analytical review of the scientific literature. The paradigm originated based on the utilization and absorption of organic compounds, which comprise the soil organic matter of green vascular plants. From the trophological point of view, green vascular plants are facultative heterotrophic (mixotrophic) organisms. Heterotrophic plant feeding is an additional feeding that makes plants more resistant to adverse environmental conditions. The plants’ consumption and assimilation of organic compounds have a direct impact on the biochemical and biophysical processes occurring in these vascular plants. As a result of organic compound utilization, plant growth and development accelerate. The natural consequence of these provisions: in the process of the biological carbon cycle in ecosystems, the circulation of organic compounds (universal structural and functional units), which can be used repeatedly at various trophic levels of ecological systems (to build primarily plant biomass), plays an essential role. The heterotrophic feeding pathway of green vascular plants is one of the auxiliary ways to regulate plant productivity.
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