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Method capable of reducing content of heavy metal cadmium in rice grains

A technology of rice grains and heavy metals, which is applied in the field of agricultural environment, can solve the problems affecting the growth of crops in the soil environment, and achieve the effect of reducing the heavy metal cadmium content of rice grains and promoting nutrient absorption

Inactive Publication Date: 2017-08-29
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, none of the above-mentioned added microbial groups are plant symbiotic microorganisms widely present in paddy soil, and their impact on other microbial groups in paddy soil is still unknown; their potential effects on plants and soil microbial community composition will affect the soil environment and crops. to grow

Method used

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  • Method capable of reducing content of heavy metal cadmium in rice grains
  • Method capable of reducing content of heavy metal cadmium in rice grains
  • Method capable of reducing content of heavy metal cadmium in rice grains

Examples

Experimental program
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Embodiment 1

[0054] In order to screen the arbuscular mycorrhizal fungi that can reduce the heavy metal cadmium content in rice grains, in this example, G. intraradicularis and / or G. mosei were used to grow in places with low cadmium pollution (the final soil cadmium content was 0.60 mg / kg). , and two rice varieties, Zhonghua 11 and Zhonghan 3, were used.

[0055] The specific method is:

[0056] (1) Inoculum treatment of planting substrates

[0057] The planting substrate used was low-cadmium-contaminated farmland soil with a soil cadmium content of 0.60 mg / kg, and the experimental group was inoculated with G. rhizogenes and / or G. moses for inoculum treatment (see Table 1). The total spore density of the arbuscular mycorrhizal fungi in the substrate is 2000 spores per liter of substrate (the inventor found through preliminary tests that the AMF spore density after inoculation is higher than 500 spores per liter of substrate, preferably between 500-10000 spores / liter of substrate, optima...

Embodiment 2

[0072] The present embodiment describes a method for utilizing arbuscular mycorrhizal fungi to reduce the content of heavy metal cadmium in rice grains, and the specific method is as follows:

[0073] (1) Inoculant treatment of planting substrate and heavy metal cadmium treatment

[0074] The planting substrate used was a mixed substrate of air-dried water soil, river sand and vermiculite, and the volume ratio of soil, river sand and vermiculite was 2:1:1. Sterilize the planting medium. After mixing the sterilized planting substrate, add cadmium-containing solution, the concentration of cadmium is 0.6mg / kg, and the additive is CdCl 2 ·2.5H 2 O, the total cadmium concentration of the substrate background is 0.75mg / kg, so the total cadmium concentration of the final planting substrate is about 1.35mg / kg, which is slightly higher than the secondary standard agricultural land in the Chinese soil environmental quality standard (GB 15618-2008). pH>7.5) The standard of cadmium con...

Embodiment 3

[0096] The only difference between Example 3 and Example 2 is that Example 3 does not sterilize the planting substrate. The test results are shown in Table 3.

[0097] Table 3. Cadmium content (mg / kg dry weight) in the glumes and grains of Han No. 3 rice

[0098]

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Abstract

The invention relates to an application of arbuscular mycorrhizal fungi in reducing the content of cadmium in rice grains planted in a cadmium contaminated planting substrate, and a method capable of reducing the content of heavy metal cadmium in the rice grains. The method capable of reducing the content of the heavy metal cadmium in the rice grains provided by the invention comprises the following steps: (1) adding the arbuscular mycorrhizal fungi into the cadmium contaminated planting substrate, wherein the content of the cadmium in the cadmium contaminated planting substrate is 0.60 to 1.35 mg / kg-1; (2) directly sowing disinfected and germination-accelerated rice seeds into the arbuscular mycorrhizal fungi added planting substrate obtained in the step (1); and (3) culturing rice until the rice is mature and rice grains are produced. The method capable of reducing the content of the heavy metal cadmium in the rice grains provided by the invention adopts a plant symbiotic microorganism, i.e., the arbuscular mycorrhizal fungi, so the content of the heavy metal cadmium in the rice grains can be reduced; soil properties may not be affected; and soil may not be polluted.

Description

technical field [0001] The invention relates to a method for reducing the content of heavy metal cadmium in rice grains, belonging to the technical field of agricultural environment. Background technique [0002] Soil heavy metal pollution has become a serious environmental problem today. According to statistics, the area of ​​arable land polluted by heavy metals in China is close to 20 million hectares. 2 , the most serious pollution is cadmium (Cd) pollution. Cadmium is a silver-white lustrous metal, and trace amounts of cadmium can cause great harm to living organisms. Since the discovery of cadmium in the early 20th century, the production of cadmium has increased year by year. Cadmium is widely used in electroplating industry, chemical industry, electronics industry, nuclear industry and other fields. It is a by-product of zinc smelting industry. It is mainly used in batteries, dyes or plastic stabilizers. And cadmium is more easily absorbed by crops than other heav...

Claims

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Application Information

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IPC IPC(8): A01G16/00A01C1/00A01C1/08A01G22/22
CPCA01C1/00A01C1/08A01G22/22
Inventor 王宇涛朱亭李韶山谈勇邱丘
Owner SOUTH CHINA NORMAL UNIVERSITY
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