HCO3-对植物生长发育及代谢的促进作用 postprint

Abstract: Bicarbonate (HCO3-) is the product of karst weathering of carbonate rocks, which profoundly affects the growth and development of plants and the ecological environment in karst areas. Previous studies mostly focused on the negative effects of HCO3- on plant growth and metabolism, such as inhibiting plant photosynthesis, reducing the activity of key enzymes in carbon and nitrogen metabolism, and damaging ion balance. Few people paid attention to its positive effects on plant growth and metabolism. Based on the results of previous studies, this paper reviewed the role of HCO3- in promoting plant growth and metabolism. Previous studies have shown that HCO3- is not only provides short-term carbon and water sources for plants under stress such as drought, but also promotes stomatal opening and restores photosynthesis. At the same time, it also promotes plant carbon and nitrogen metabolism by regulating the key enzyme activities of carbon and nitrogen metabolism, and participates in the regulation of complex physiological processes such as carbon assimilation and nitrogen reduction in plants. In addition, HCO3- can also change the distribution of glycolysis pathway and pentose phosphate pathway by affecting glucose metabolism disproportionation, so as to enhance the stress resistance of plants and obtain survival opportunities. These positive effects of HCO3- are not only make it a key factor to promote plant physiological metabolism, but also become a link connecting photosynthesis and karstification. Clarifying the positive effect of HCO3- on plant growth and development can provide a theoretical basis for maintaining the biodiversity and stability of karst ecosystem and optimizing the function of karst ecosystem.