Publications by authors named "MengJie An"

4 Publications

  • Page 1 of 1

Metabolic regulation in soil microbial succession and niche differentiation by the polymer amendment under cadmium stress.

J Hazard Mater 2021 Aug 15;416:126094. Epub 2021 May 15.

Agricultural College, Shihezi University, Shihezi, Xinjiang 832000, PR China. Electronic address:

Cadmium (Cd) contamination seriously threatens the agricultural production, so exploring the response of soil microenvironment to amendments in Cd-contaminated soils is of importance. In this study, the mechanism of remediation of Cd-contaminated soil using the polymer amendment was studied in cotton flowering stage. The results showed that the concentration of Cd in cotton root and various Cd forms in Cd-contaminated soils were obviously high. High concentration of Cd, especially exchangeable Cd, could seriously affect the soil microenvironment. The root growth of cotton could be promoted, the carbon and nitrogen concentration and storage in soil were increased by 21.72-50.00%, while the exchangeable Cd concentration in soil were decreased by 41.43%, after applying the polymer amendment. In addition, the polymer amendment affected the soil microbial niche, increased the relative abundance of soil bacteria (Flaviaesturariibacter, Rubellimicrobium, and Cnuella), fungi (Verticillium and Tricharina), actinomycetes (Blastococcus and Nocardioides), and fungivores nematodes (Aphelenchus), and improved soil microbial metabolic functions (metabolism of nucleotides and carbohydrates). Therefore, this polymer amendment could be used to remediate severe Cd-contaminated soils, and the changes in the microbial and nematode communities help us understand the detoxification mechanism of the polymer amendment in Cd-contaminated soils.
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http://dx.doi.org/10.1016/j.jhazmat.2021.126094DOI Listing
August 2021

Effects of Organic Polymer Compound Material on K and Na Distribution and Physiological Characteristics of Cotton Under Saline and Alkaline Stresses.

Front Plant Sci 2021 28;12:636536. Epub 2021 May 28.

Agricultural College, Shihezi University, Shihezi, China.

Soil salinization and alkalization greatly restrict crop growth and yield. In this study, NaCl (8 g kg) and NaCO (8 g kg) were used to create saline stress and alkaline stress on cotton in pot cultivation in the field, and organic polymer compound material (OPCM) and stem girdling were applied before cotton sowing and at flowering and boll-forming stage, respectively, aiming to determine the effects of OPCM on K and Na absorption and transport and physiological characteristics of cotton leaf and root. The results showed that after applying the OPCM, the Na content in leaf of cotton under saline stress and alkaline stress were decreased by 7.72 and 6.49%, respectively, the K/Na ratio in leaf were increased by 5.65 and 19.10%, respectively, the Na content in root were decreased by 9.57 and 0.53%, respectively, the K/Na ratio in root were increased by 65.77 and 55.84%, respectively, and the transport coefficients of K and Na from leaf to root were increased by 39.59 and 21.38%, respectively. The activities of superoxide dismutase (SOD), catalase (CAT), and peroxidase (POD), and the relative electrical conductivity (REC) in cotton leaf were significantly increased, while the content of malondialdehyde (MDA) was decreased; but the changes in those in root were not significant. The boll weights were increased by 11.40 and 13.37%, respectively, compared with those for the control. After stem girdling, the application of OPCM still promoted the ion transport of cotton organs; moreover, the CAT activity in root was increased by 25.09% under saline stress, and the SOD activity in leaf and CAT in root were increased by 42.22 and 6.91%, respectively under alkaline stress. Therefore, OPCM can significantly change the transport of K and Na to maintain the K and Na homeostasis in leaf and root, and regulate physiological and biochemical indicators to alleviate the stress-induced damage. Besides, the regulation effect of OPCM on saline stress was better than that on alkaline stress.
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http://dx.doi.org/10.3389/fpls.2021.636536DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8194489PMC
May 2021

Application of compound material alleviates saline and alkaline stress in cotton leaves through regulation of the transcriptome.

BMC Plant Biol 2020 Oct 8;20(1):462. Epub 2020 Oct 8.

Agricultural College, Shihezi University, Shihezi, Xinjiang, 832000, People's Republic of China.

Background: Soil salinization and alkalinization are the main factors that affect the agricultural productivity. Evaluating the persistence of the compound material applied in field soils is an important part of the regulation of the responses of cotton to saline and alkaline stresses.

Result: To determine the molecular effects of compound material on the cotton's responses to saline stress and alkaline stress, cotton was planted in the salinized soil (NaCl 8 g kg) and alkalized soil (NaCO 8 g kg) after application of the compound material, and ion content, physiological characteristics, and transcription of new cotton leaves at flowering and boll-forming stage were analyzed. The results showed that compared with saline stress, alkaline stress increased the contents of Na, K, SOD, and MDA in leaves. The application of the compound material reduced the content of Na but increased the K/Na ratio, the activities of SOD, POD, and CAT, and REC. Transcriptome analysis revealed that after the application of the compound material, the Na/H exchanger gene in cotton leaves was down-regulated, while the K transporter, K channel, and POD genes were up-regulated. Besides, the down-regulation of genes related to lignin synthesis in phenylalanine biosynthesis pathway had a close relationship with the ion content and physiological characteristics in leaves. The quantitative analysis with PCR proved the reliability of the results of RNA sequencing.

Conclusion: These findings suggest that the compound material alleviated saline stress and alkaline stress on cotton leaves by regulating candidate genes in key biological pathways, which improves our understanding of the molecular mechanism of the compound material regulating the responses of cotton to saline stress and alkaline stress.
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http://dx.doi.org/10.1186/s12870-020-02649-0DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7542905PMC
October 2020

Study on the effects of polymer modifiers and phloem girdling on cotton in cadmium-contaminated soil in Xinjiang Province, China.

Sci Rep 2020 04 14;10(1):6356. Epub 2020 Apr 14.

Agriculture College, Shihezi University, Shihezi, Xinjiang, 832003, China.

The effects of two liquid modifiers (polyacrylate compound modifier and organic polymer compound modifier) and phloem girdling (stem girdling and branch girdling) on cadmium (Cd) content, Cd transport, and photosynthetic parameters of cotton (Xinluzao 60) in Cd-contaminated soil (40 mg kg ) were studied through barrel experiment. The results showed that the distribution ratios of Cd in stem, leaves, and bolls, leaf net photosynthetic rate (Pn), leaf stomatal conductance (Gs), leaf transpiration rate (Tr), and chlorophyll content were decreased after girdling; and the application of modifiers reduced the Cd content and the Cd transported to the shoot, while alleviating photosynthetic damage caused by girdling. In general, our results indicated that the inhibition of carbohydrate supply caused by girdling reduced the photosynthetic capacity of cotton, while the applications of the two liquid modifiers decrease the influence to cotton photosynthesis. Moreover, Cd and modifiers may be transported to the shoot through both phloem and xylem.
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http://dx.doi.org/10.1038/s41598-020-63421-wDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7156520PMC
April 2020
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