CN114190188A - Method for relieving plant growth inhibition under stress of high-concentration rare earth elements and application - Google Patents
Method for relieving plant growth inhibition under stress of high-concentration rare earth elements and application Download PDFInfo
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- CN114190188A CN114190188A CN202111308208.6A CN202111308208A CN114190188A CN 114190188 A CN114190188 A CN 114190188A CN 202111308208 A CN202111308208 A CN 202111308208A CN 114190188 A CN114190188 A CN 114190188A
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G7/00—Botany in general
- A01G7/06—Treatment of growing trees or plants, e.g. for preventing decay of wood, for tingeing flowers or wood, for prolonging the life of plants
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01C—PLANTING; SOWING; FERTILISING
- A01C1/00—Apparatus, or methods of use thereof, for testing or treating seed, roots, or the like, prior to sowing or planting
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G22/00—Cultivation of specific crops or plants not otherwise provided for
- A01G22/20—Cereals
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G22/00—Cultivation of specific crops or plants not otherwise provided for
- A01G22/40—Fabaceae, e.g. beans or peas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
- B09C1/105—Reclamation of contaminated soil microbiologically, biologically or by using enzymes using fungi or plants
Abstract
The invention provides a method for relieving plant growth retardation under stress of high-concentration rare earth elements, belonging to the technical field of soil remediation, and comprising the following steps: during the growth of the plants, carbon quantum dot solution with the concentration of 0.005-0.05mg/ml is applied to the plants. According to the method, the carbon quantum dot solution with a certain concentration is applied in the plant growth process, the inhibition effect of the high-concentration rare earth elements on the plant growth is effectively relieved, the absorption and enrichment of the plants on the soil rare earth elements are not obviously influenced, and the effect of reducing the excessive enrichment of the rare earth elements in the soil is further achieved. The invention also provides application of the method for relieving plant growth retardation under the stress of the high-concentration rare earth elements in relieving soil pollution caused by the rare earth elements.
Description
Technical Field
The invention belongs to the technical field of soil remediation, and particularly relates to a method for relieving plant growth retardation under stress of high-concentration rare earth elements and application of the method.
Background
The rare earth element is a general name of 17 elements including 15 lanthanide elements in a chemical element periodic table and two elements (yttrium and scandium) closely related to the lanthanide elements, and is widely applied to the fields of electronics, petrochemical industry, metallurgy, machinery, energy, light industry, environmental protection, agriculture and the like. In the field of agricultural production, low-concentration rare earth elements show the effects of promoting crop yield improvement, improving quality, enhancing stress resistance and disease resistance and the like, are called super calcium, and the history of use of rare earth fertilizers in China is nearly 40 years.
However, the extensive mining and smelting of rare earth ores and the constant agricultural application thereof lead to the continuous accumulation of rare earth elements in farmland soil and the formation of pollution. Research shows that the rare earth elements have low promotion and high inhibition hormesis effect on plant growth, namely, the high-concentration rare earth elements in the soil can inhibit the growth of plants, further seriously affect the structure and the function stability of a farmland ecosystem and destroy the biodiversity. At present, the polluted rare earth element soil is mainly subjected to absorption enrichment treatment by planting rare earth hyper-enrichment plants such as the dicranopteris pedata and the like, but the plants such as the dicranopteris pedata are not economic plants and occupy a large amount of production time and production cost when being applied to agriculture. Therefore, the development of the method which can directly relieve the growth inhibition of crops under the condition of high-concentration rare earth and does not influence the absorption of plants to the rare earth elements can avoid the defect.
Disclosure of Invention
In order to solve the technical problem that crops are hindered in growth under the condition of high-concentration rare earth, the invention provides a method for relieving plant growth retardation under the stress of high-concentration rare earth elements.
The invention also provides application of the method for relieving plant growth retardation under the stress of the high-concentration rare earth elements in relieving soil pollution caused by the rare earth elements.
The invention is realized by the following technical scheme:
a method of mitigating plant growth retardation under high concentration rare earth element stress, the method comprising:
during the growth of the plants, carbon quantum dot solution with the concentration of 0.005-0.05mg/ml is applied to the plants.
Further, the plant growth process comprises a plant seed germination process and/or a plant seedling growth process.
Further, the application frequency of the carbon quantum dot solution is not less than one time in the plant growth process.
Further, during the growth of plants, the method for applying the carbon quantum dot solution comprises any one of the following methods:
immersing plant seeds or plant roots in a liquid culture medium with the mass concentration of the carbon quantum dots being 0.005-0.05 mg/ml;
and irrigating the carbon quantum dot solution to the roots of the soil-cultivated plant seedlings.
Furthermore, in the carbon quantum dot solution, the carbon quantum dots are synthesized by using citric acid and urea as raw materials and adopting a microwave method.
Further, the plant includes at least one of mung bean, soybean and corn.
An application of a method for relieving plant growth obstruction under the stress of high-concentration rare earth elements in relieving soil pollution caused by the rare earth elements.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
1. according to the method for relieving plant growth obstruction under the stress of the high-concentration rare earth elements, a carbon quantum dot solution with a certain concentration is applied in the plant growth process, carbon quantum dots absorbed by plants in vivo and rare earth element ions entering the plants form larger flocculates, the concentration of the flocculates in the plants is reduced, and therefore the plant growth inhibition by the high-concentration rare earth elements is relieved, and the plant growth obstruction phenomenon under the stress of the high-concentration rare earth elements is effectively relieved.
2. The method for relieving plant growth retardation under the stress of high-concentration rare earth elements is applied to the relief of soil pollution caused by the rare earth elements, and the carbon quantum dot solution with a certain concentration is applied in the plant growth process, so that the soil pollution caused by the rare earth elements is relieved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a transmission electron microscope image of flocs formed on roots of mung bean seedlings treated with a carbon quantum dot solution.
FIG. 2 shows the treatment of carbon quantum dot solution on mung bean plant La3+Effect graph of content: in the figure, WT is a control group; CL: 0.01mg/ml carbon quantum dot solution + 30. mu. mol/L La3+A treatment group; la: 30 mu mol/L La3+And (6) processing the groups.
FIG. 3 is a graph of 0.01mg/ml CDs (i.e., carbon quantum dot solution) versus 30. mu. mol/L La3+The contrast chart of the growth promoting effect of the treated mung bean seedlings comprises the following steps: a, pictures of treated mung bean seedlings (upper) and roots (lower); and B, drawing: the whole length of the plant; and (C) diagram: root length; wherein, WT is a control group; CD1:0.01mg/ml CDs treated group; la 30: 30 mu mol/L La3+A treatment group; C1L 30: 0.01mg/ml CDs + 30. mu. mol/LLa3+And (6) processing the groups.
FIG. 4 is a graph of 0.01mg/ml CDs vs 60. mu. mol/L La3+The contrast chart of the growth promoting effect of the treated mung bean seedlings comprises the following steps: a, pictures of treated mung bean seedlings (upper) and roots (lower); and B, drawing: the whole length of the plant; and (C) diagram: root length; wherein, WT is a control group; CD1:0.01mg/ml CDs treated group; la 60: 60 mu mol/L La3+A treatment group; C1L 60: 0.01mg/ml CDs + 60. mu. mol/L La3+And (6) processing the groups.
FIG. 5 is a graph of 0.05mg/ml CDs versus 30. mu. mol/L La3+The contrast chart of the growth promoting effect of the treated mung bean seedlings comprises the following steps: a, pictures of treated mung bean seedlings (upper) and roots (lower); and B, drawing: the whole length of the plant; and (C) diagram: root length; wherein, WT is a control group; CD5:0.05mg/ml CDs treated group; la 30: 30 mu mol/L La3+A treatment group; C5L 30: 0.05mg/ml CDs + 30. mu. mol/L La3+And (6) processing the groups.
FIG. 6 is a graph of 0.01mg/ml CDs vs 30. mu. mol/L La3+Comparison of growth promoting effect of treated soybean seedlings: a shows the pictures of the treated soybean seedlings (upper) and roots (lower); and B, drawing: the whole length of the plant; and (C) diagram: root length; wherein, WT is a control group; CD1:0.01mg/ml CDs treated group; la 30: 30 mu mol/L La3+A treatment group; C1L 30: 0.01mg/ml CDs + 30. mu. mol/L La3+And (6) processing the groups.
FIG. 7 is a graph of 0.01mg/ml CDs vs 30. mu. mol/L La3+Comparison of growth promoting effect of treated maize seedlings: a, pictures of treated maize seedlings (upper) and roots (lower); and B, drawing: the whole length of the plant; and (C) diagram: root length; wherein, WT is a control group; CA, 0.01mg/ml CDs treatment group; la: 30 mu mol/L La3+A treatment group; C1L 30: 0.01mg/ml CDs + 30. mu. mol/LLa3+And (6) processing the groups.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
The method for alleviating plant growth retardation under high-concentration rare earth element stress according to the present application will be described in detail below with reference to examples and experimental data.
Example 1
A method of mitigating plant growth retardation under high concentration rare earth element stress, the method comprising:
(1) adding lanthanum chloride into liquid culture medium (water or Hoagland nutrient solution) to make La in the liquid culture medium3+Reaching a certain concentration;
(2) soaking the roots of the germinated seeds or seedlings in the liquid culture medium obtained in the step (1) for culture, and simultaneously applying a carbon quantum dot solution with the concentration of 0.005-0.05mg/ml to the liquid culture medium.
(3) And after 5-6 days of culture, taking out and measuring the total length of the seedling plant and the total length of the root system.
Example 2
This example demonstrates that treatment with carbon quantum dot solution is applied to green bean plants La3+Influence of the content.
The 48 mung bean seeds, which were nearly full in size, full and without significant damage, were randomly divided into 3 groups of 16 seeds, numbered 1, 2 and 3. Culturing 3 groups of seeds in liquid culture medium (Hoagland nutrient solution), wherein the liquid culture medium of group 1 has no excessive additives, and the liquid culture medium of group 2 is simultaneously added with CDs with concentration of 0.01mg/ml and La with concentration of 30 μmol/L3+Group 3 liquid culture Medium was supplemented with La at a concentration of 30. mu. mol/L3+。
After 6 days of continuous culture, the roots of the mung bean seedlings of group 2 were observed as cut pieces, and the results are shown in FIG. 1. Respectively carrying out La on roots, stems and leaves of 3 groups of mung bean seedlings by utilizing ICP-AES (inductively coupled plasma-atomic emission spectrometry)3+The concentration is detected, and the concentration is detected,counting La in the rhizome leaves of each group of seedlings3+Average concentration and plant La3+Average concentration. The results are shown in FIG. 2.
As can be seen from FIG. 1, the mung bean seedlings in group 2 were treated with 0.01mg/ml CDs and 30. mu. mol/L La3+After treatment, the roots of the mung bean seedlings form flocs formed by carbon quantum dots and rare earth element ions, and La is reduced3+The concentration in the mung bean seedlings is reduced, so that the inhibition of high-concentration rare earth elements on plants is relieved.
In FIG. 2, the seedlings of groups 1 to 3 correspond to WT, CL and LA in FIG. 2, respectively, La from CL and LA3+The concentration data show that 0.01mg/ml CDs can reduce the average La of the roots, stems and whole plants of the mung bean seedlings to a certain extent3+The concentration does not reach the obvious level, and the rare earth elements can still be effectively enriched at the roots of the plants, thereby achieving the purpose of reducing the content of the rare earth elements in the soil.
Example 3
This example demonstrates the effect of carbon quantum dot solution treatment on the growth of mung bean plants
Dividing 64 mung bean seeds with approximate sizes, full granules and no obvious damage into 4 groups at random, wherein each group contains 16 mung bean seeds, and the number of the mung bean seeds is 1-4. Culturing 4 groups of semen Phaseoli Radiati seeds in liquid culture medium (Hoagland nutrient solution), wherein the 1 st group of liquid culture medium has no excessive additive, the 2 nd group of liquid culture medium is supplemented with CDs with concentration of 0.01mg/ml, and the 3 rd group of liquid culture medium is supplemented with La with concentration of 30 μmol/L3+(lanthanum oxide), group 4 liquid Medium was supplemented with CDs at a concentration of 0.01mg/ml and La at a concentration of 30. mu. mol/L simultaneously3+。
The average of the total length of the plants and the average of the total length of the root system of each group of plants were measured and counted after 5 days of continuous culture, and the results are shown in FIG. 3, wherein the seedling length of the 1 st group (WT) is 114.2 + -17.5 mm, the root length is 48.4 + -15.5 mm, the root soluble protein is 542.4 + -47.3 mug/g (FW), and the chlorophyll content is 2.06 mug/g (FW).
After the 30 mu mol/L lanthanum chloride treatment group is treated by the mixed carbon quantum dots (group 4), the growth of the plants can be recovered to the state of normal seedlings, and even better. After 0.01mg/mL carbon quantum dot treatment, the seedling length of the seedlings in group 4 increased from 97.5 + -27.8 mm in group 3 to 136.8 + -17.6 mm, the root length increased from 45.5 + -19.3 mm in group 3 to 64.1 + -13.3 mm, and the root soluble protein increased from 386.6 + -19.5 μ g/g (FW) in group 3 to 556.2 + -72.3 μ g/g (FW).
As can be seen from FIG. 3, the 30. mu. mol/L lanthanum chloride treatment inhibited the growth of the mung bean plants, and the carbon quantum dot solution was applied at a certain concentration, so that the growth of the plants could be recovered and even better.
Example 4
This example differs from example 3 only in that: la in the liquid culture media of groups 3 and 43+The concentrations of lanthanum oxide were all 60. mu. mol/L.
As shown in FIG. 4, after the lanthanum chloride treatment group of 60. mu. mol/L was treated at the carbon quantum dot of 0.01mg/mL, the shoot length increased from 65.6 + -18.9 mm of the group 3 to 88.6 + -20.6 mm, the root length increased from 11.7 + -4.7 mm of the group 3 to 27.4 + -10.8 mm, and the root soluble protein increased from 276.4 + -43.0. mu.g/g (FW) of the group 3 to 364.1 + -38.4. mu.g/g (FW).
Example 5
This example differs from example 3 only in that: the CDs concentration in the liquid medium of group 2 and group 4 were 0.05 mg/ml.
As shown in FIG. 5, the growth of the plants was restored to a state close to that of normal seedlings after the 30. mu. mol/L lanthanum chloride-treated group was treated at the carbon quantum dots of 0.05mg/mL for 5 days. After the carbon quantum dot treatment of 0.05mg/mL, the seedling length is improved from 97.5 +/-27.8 mm of the group 3 to 116.0 +/-26.1 mm, and the root length is improved from 45.5 +/-19.3 mm of the group 3 to 51.5 +/-15.7 mm.
Example 6
This example demonstrates the effect of carbon quantum dot solution treatment on soybean plant growth
The 40 soybean plants are randomly divided into 4 groups, 10 soybean plants in each group are numbered as 1-4. Culturing 4 groups of plants in liquid culture medium (Hoagland nutrient solution), wherein the liquid culture medium of the 1 st group of plants has no extra additive, the liquid culture medium of the 2 nd group of plants is added with CDs with the concentration of 0.01mg/ml, and the liquid culture medium of the 3 rd group of plants is added with La with the concentration of 30 mu mol/L3+(lanthanum oxide), group 4 plant broth supplemented with both CDs at a concentration of 0.01mg/ml and 30. mu. mol/L La3+。
The average value of the total length of the plants and the average value of the total length of the roots of each group of plants were measured and counted after continuous culture for 6 days, and the results are shown in FIG. 6, wherein the length of the seedling of the 1 st group (WT) is 84.7 +/-15.6 mm, and the length of the root is 26.4 +/-12.8 mm; after the 30 mu mol/L lanthanum chloride treatment group is treated by the mixed carbon quantum dots (group 4), the growth of the plants is close to the state of normal seedlings. After the plants in the 4 th group are treated by the carbon quantum dots of 0.01mg/mL, the seedling length is improved to 71.1 +/-23.2 mm from 48.1 +/-19.5 mm of the 3 rd group, and the root length is improved to 23.0 +/-10.2 mm from 8.0 +/-7.7 mm of the 3 rd group.
As can be seen from FIG. 6, the 30. mu. mol/L lanthanum chloride treatment inhibited the growth of soybean plants, and the application of a carbon quantum dot solution of a certain concentration allowed the growth of plants to recover even better.
Example 7
This example demonstrates the effect of carbon quantum dot solution treatment on maize plant growth
The method comprises the following steps of randomly dividing 40 corn plants into 4 groups, wherein 10 corn plants in each group are numbered as 1-4. Culturing 4 groups of plants in liquid culture medium (Hoagland nutrient solution), wherein the liquid culture medium of the 1 st group of plants has no extra additive, the liquid culture medium of the 2 nd group of plants is added with CDs with the concentration of 0.01mg/ml, and the liquid culture medium of the 3 rd group of plants is added with La with the concentration of 30 mu mol/L3+(lanthanum oxide), group 4 plant broth supplemented with both CDs at a concentration of 0.01mg/ml and 30. mu. mol/L La3+。
The average value of the total length of the plants and the average value of the total length of the roots of each group of plants were measured and counted after continuous culture for 6 days, and the results are shown in FIG. 7, wherein the length of the seedling of the 1 st group (WT) is 94.9 +/-27.8 mm, and the length of the root is 53.8 +/-18.7 mm; after the 30 mu mol/L lanthanum chloride treatment group is treated by the mixed carbon quantum dots (group 4), the growth of the plants is close to the state of normal seedlings. After the corn plants in the 4 th group are treated by the carbon quantum dots of 0.01mg/mL, the seedling length is improved to 78.8 +/-20.2 mm from 58.7 +/-9.9 mm of the 3 rd group, and the root length is improved to 42.0 +/-18.1 mm from 28.5 +/-3.9 mm of the 3 rd group.
As can be seen from FIG. 7, the 30. mu. mol/L lanthanum chloride treatment inhibited the growth of maize seedlings, and the carbon quantum dot solution was applied at a concentration that allowed the growth of maize seedlings to return to normal.
In the embodiments of the present invention, the carbon quantum dots are obtained by purchase.
The carbon quantum dots can also be synthesized by a conventional method, such as a microwave method by using citric acid and urea as raw materials. Diluting the obtained carbon quantum dot solution to a use concentration (such as 0.01mg/ml, and adjusting according to different basic carbon quantum dots) as a carbon quantum dot working solution, and performing irrigation periodically at the stages of seed germination and seedling growth.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. A method for alleviating the growth retardation of plants stressed by high concentrations of rare earth elements, the method comprising:
during the growth of the plants, carbon quantum dot solution with the concentration of 0.005-0.05mg/ml is applied to the plants.
2. The method for relieving plant growth retardation under high-concentration rare earth element stress according to claim 1, wherein the plant growth process comprises a plant seed germination process and/or a plant seedling growth process.
3. The method for relieving plant growth retardation under high-concentration rare earth element stress of claim 1, wherein the carbon quantum dot solution is applied not less than once during the plant growth.
4. The method for relieving plant growth retardation under high-concentration rare earth element stress according to claim 1, wherein the method for applying the carbon quantum dot solution comprises any one of the following methods in the plant growth process:
immersing plant seeds or plant roots in a liquid culture medium with the mass concentration of the carbon quantum dots being 0.005-0.05 mg/ml;
and irrigating the carbon quantum dot solution to the roots of the soil-cultivated plant seedlings.
5. The method for relieving plant growth retardation under high-concentration rare earth element stress as claimed in claim 1, wherein in the carbon quantum dot solution, carbon quantum dots are synthesized by a microwave method by using citric acid and urea as raw materials.
6. The method for alleviating plant growth retardation under high rare earth stress as claimed in claim 1, wherein the plant comprises at least one of mung bean, soybean and corn.
7. Use of the method for alleviating the stress-induced plant growth retardation of rare earth elements according to claims 1 to 6 for alleviating soil pollution caused by rare earth elements.
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