Rice seedling culture solution added with exogenous salicylic acid and application of rice seedling culture solution

Abstract

The invention discloses a rice seedling culture solution added with exogenous salicylic acid and application of the rice seedling culture solution. According to the rice seedling culture solution added with the exogenous salicylic acid, the exogenous salicylic acid is added on the basis of a rice nutrient solution formula, and the addition amount is 100 [mu]mol/L<-1>. The cadmium content of root systems and overground parts of rice seedlings is reduced; the rice seedling culture solution is used for regulating pectin synthesis, deesterification and lignin synthesis to reduce cadmium accumulation of rice plants and relieve poison of cadmium stress to rice seedlings; the rice seedlings are cultured in the rice seedling culture solution for 10 days, the pectin content and deesterification degree of roots are increased, free carboxyl in pectin is increased, and the adsorption and combination capacity of cell walls to cadmium is enhanced; meanwhile, root lignin content is increased, the cell walls are thickened, and cadmium ions are prevented from entering cells. The invention discloses and verifies an important rice Cd regulation mechanism, and provides theoretical guidance and a feasible scheme for safe production of cadmium-polluted rice field soil.

Description

technical field [0001] The invention belongs to the field of remediation of heavy metal pollution in farmland soil, and relates to a culture solution for reducing cadmium content in rice seedling roots and aerial parts and its application. Background technique [0002] Cadmium (Cd) is a highly toxic trace heavy metal that widely exists in nature. In recent years, with the smelting of heavy metal ores in my country, the long-term application of cadmium-containing phosphate fertilizers, and the deposition of industrial "three wastes" and other human factors, the problem of cadmium pollution in farmland has become increasingly prominent. According to the "National Soil Pollution Survey Bulletin" in 2014, the rate of cadmium in my country's soil exceeded the standard by 7%, ranking first among the eight excessive metal elements. Rice is the most important food crop in my country, and it is also a crop with relatively high accumulation of cadmium. Incidents of excessive cadmium ...

AI Technical Summary

Problems solved by technology

However, whether salicylic acid adsorbs and fixes cadmium toxicity by co-regulating the synthesis of pectin and lignin in the root cell wall remains to be further studied.

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