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Su X, Liu X, Li C, Zhang Y. 24-epibrassinolide as a multidimensional regulator of rice (Oryza sativa) physiological and molecular responses under isoproturon stress. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2024; 281:116575. [PMID: 38917591 DOI: 10.1016/j.ecoenv.2024.116575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Revised: 06/05/2024] [Accepted: 06/06/2024] [Indexed: 06/27/2024]
Abstract
Brassinosteroids (BRs) can regulate various processes in plant development and defense against environmental stress. In this study, the contribution of BRs in the degradation of isoproturon (IPU) in rice has been established. IPU has a significant effect on rice growth, chlorophyll content, and membrane permeability. When treated with 1.0 μmol/L 24-epibrassinolide (EBR), a BR analogue, the associated symptoms of rice poisoning were alleviated as the IPU levels in the rice and growth media were decreased. In the presence of EBR, the activities of several IPU-related detoxification enzymes were enhanced to cope with the stress due to IPU. An RNA-sequencing (RNA-Seq) has been performed to determine the variation of transcriptomes and metabolic mechanisms in rice treated with EBR, IPU, or IPU+EBR. Some of the differentially expressed genes (DEGs) were Phase I-III reaction components of plants, such as cytochrome P450 (CYP450), glutathione S-transferase (GST), glycosyltransferases (GTs), and the ATP-binding cassette transporter (ABC transporter). The expression of some signal transduction genes was significantly up-regulated. The relative content of low-toxicity IPU metabolites increased due to the presence of EBR as determined by UPLC/Q-TOF-MS/MS. The IPU metabolic pathways include enzyme-catalyzed demethylation, hydroxylation, hydrolysis, glycosylation, and amino acid conjugation processes. The results suggest that EBR plays a key role in the degradation and detoxification of IPU. This study has provided evidence that BRs regulate the metabolism and detoxification of IPU in rice, and offers a new approach to ensuring cleaner crops by eliminating pesticide residues in the environment.
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Affiliation(s)
- Xiangning Su
- Plant Protection Research Institute, Guangdong Academy of Agricultural Sciences & Key Laboratory of Green Prevention and Control of Fruits and Vegetables in South China, Ministry of Agriculture and Rural Affairs & Key Laboratory of High Technology for Plant Protecftion of Guangdong Province, Guangzhou 510640, China.
| | - Xuesong Liu
- Institute of Agricultural Facilities and Equipment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
| | - Chuanying Li
- Plant Protection Research Institute, Guangdong Academy of Agricultural Sciences & Key Laboratory of Green Prevention and Control of Fruits and Vegetables in South China, Ministry of Agriculture and Rural Affairs & Key Laboratory of High Technology for Plant Protecftion of Guangdong Province, Guangzhou 510640, China
| | - Yuping Zhang
- Plant Protection Research Institute, Guangdong Academy of Agricultural Sciences & Key Laboratory of Green Prevention and Control of Fruits and Vegetables in South China, Ministry of Agriculture and Rural Affairs & Key Laboratory of High Technology for Plant Protecftion of Guangdong Province, Guangzhou 510640, China.
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2
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Su X, Li CY, Liu XS, Zhang YP. The role of OsBZR4 as a brassinosteroid-signaling component in mediating atrazine and isoproturon degradation in rice. JOURNAL OF HAZARDOUS MATERIALS 2024; 473:134625. [PMID: 38759408 DOI: 10.1016/j.jhazmat.2024.134625] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2024] [Revised: 05/02/2024] [Accepted: 05/13/2024] [Indexed: 05/19/2024]
Abstract
Development of a biotechnological system for rapid degradation of pesticides is important to mitigate the environmental, food security, and health risks that they pose. Degradation of atrazine (ATZ) and isoproturon (IPU) in rice crops promoted by the brassinosteroid (BR) signaling component BRASSINAZOLE RESISTANT4 (OsBZR4) is explored. OsBZR4 is localized in the plasma membrane and nucleus, and is strongly induced by ATZ and IPU exposure. Transgenic rice OsBZR4-overexpression (OE) significantly enhances resistance to ATZ and IPU toxicity, improving growth, and reducing ATZ and IPU accumulation (particularly in grains) in rice crops. Genetic destruction of OsBZR4 (CRISPR/Cas9) increases rice sensitivity and leads to increased accumulation of ATZ and IPU. OE plants promote phase I, II, and III metabolic reactions, and expression of corresponding pesticide degradation genes under ATZ and IPU stress. UPLC-Q-TOF-MS/MS analysis reveals increased relative contents of ATZ and IPU metabolites and conjugates in OE plants, suggesting an increased OsBZR4 expression and consequent detoxification of ATZ and IPU in rice and the environment. The role of OsBZR4 in pesticide degradation is revealed, and its potential application in enhancing plant resistance to pesticides, and facilitating the breakdown of pesticides in rice and the environment, is discussed.
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Affiliation(s)
- Xiangning Su
- Research Institute of Plant Protection, Guangdong Academy of Agricultural Sciences & Key Laboratory of Green Prevention and Control of Fruits and Vegetables in South China, Ministry of Agriculture and Rural Affairs & Key Laboratory of High Technology for Plant Protection of Guangdong Province, Guangzhou 510640, China.
| | - Chuan Ying Li
- Research Institute of Plant Protection, Guangdong Academy of Agricultural Sciences & Key Laboratory of Green Prevention and Control of Fruits and Vegetables in South China, Ministry of Agriculture and Rural Affairs & Key Laboratory of High Technology for Plant Protection of Guangdong Province, Guangzhou 510640, China
| | - Xue Song Liu
- Institute of Agricultural Facilities and Equipment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
| | - Yu Ping Zhang
- Research Institute of Plant Protection, Guangdong Academy of Agricultural Sciences & Key Laboratory of Green Prevention and Control of Fruits and Vegetables in South China, Ministry of Agriculture and Rural Affairs & Key Laboratory of High Technology for Plant Protection of Guangdong Province, Guangzhou 510640, China.
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Nie W, Gong B, Geng B, Wen D, Qiao P, Guo H, Shi Q. The Effects of Exogenous 2,4-Epibrassinolide on the Germination of Cucumber Seeds under NaHCO 3 Stress. PLANTS (BASEL, SWITZERLAND) 2024; 13:394. [PMID: 38337927 PMCID: PMC10856843 DOI: 10.3390/plants13030394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2023] [Revised: 01/20/2024] [Accepted: 01/26/2024] [Indexed: 02/12/2024]
Abstract
This investigation focused on the suppressive impact of varying NaHCO3 concentrations on cucumber seed germination and the ameliorative effects of 2,4-Epibrassinolide (EBR). The findings revealed a negative correlation between NaHCO3 concentration and cucumber seed germination, with increased NaHCO3 concentrations leading to a notable decline in germination. Crucially, the application of exogenous EBR significantly counteracted this inhibition, effectively enhancing germination rates and seed vigor. Exogenous EBR was observed to substantially elevate the activities of superoxide dismutase (SOD), catalase (CAT), and peroxidase (POD), thereby mitigating oxidative damage triggered under NaHCO3 stress conditions. Additionally, EBR improved enzyme activity under alkaline stress conditions and reduced starch content in the seeds. Pertinently, EBR upregulated genes that were associated with gibberellin (GA) synthesis (GA20ox and GA3ox), and downregulated genes that were linked to abscisic acid (ABA) synthesis (NCED1 and NCED2). This led to an elevation in GA3 concentration and a reduction in ABA concentration within the cucumber seeds. Therefore, this study elucidates that alleviating oxidative stress, promoting starch catabolism, and regulating the GA and ABA balance are key mechanisms through which exogenous EBR mitigates the suppression of cucumber seed germination resulting from alkaline stress.
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Affiliation(s)
- Wenjing Nie
- Yantai Engineering Research Center for Plant Stem Cell Targeted Breeding, Shandong Institute of Sericulture, Yantai 264001, China; (W.N.)
| | - Biao Gong
- Stage Key Laboratory of Crop Biology, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai’an 271018, China
| | - Bing Geng
- Yantai Engineering Research Center for Plant Stem Cell Targeted Breeding, Shandong Institute of Sericulture, Yantai 264001, China; (W.N.)
| | - Dan Wen
- Yantai Engineering Research Center for Plant Stem Cell Targeted Breeding, Shandong Institute of Sericulture, Yantai 264001, China; (W.N.)
| | - Peng Qiao
- Yantai Engineering Research Center for Plant Stem Cell Targeted Breeding, Shandong Institute of Sericulture, Yantai 264001, China; (W.N.)
| | - Hongen Guo
- Yantai Engineering Research Center for Plant Stem Cell Targeted Breeding, Shandong Institute of Sericulture, Yantai 264001, China; (W.N.)
| | - Qinghua Shi
- Stage Key Laboratory of Crop Biology, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai’an 271018, China
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Kumar N, Sharma V, Kaur G, Lata C, Dasila H, Perveen K, Khan F, Gupta VK, Khanam MN. Brassinosteroids as promoters of seedling growth and antioxidant activity under heavy metal zinc stress in mung bean ( Vigna radiata L.). Front Microbiol 2023; 14:1259103. [PMID: 37869675 PMCID: PMC10586047 DOI: 10.3389/fmicb.2023.1259103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Accepted: 09/12/2023] [Indexed: 10/24/2023] Open
Abstract
The escalation of harmful pollutants, including heavy metals, due to industrialization and urbanization has become a global concern. To mitigate the negative impacts of heavy metal stress on germination and early plant development, growth regulators have been employed. This study aimed to evaluate the response of mung bean (Vigna radiata L.) to zinc stress in the presence of brassinosteroids, focusing on seedling growth and antioxidant potential. Mung bean seedlings were treated with three concentrations of 24-epibrassinolide (EBL) (0.1, 0.2, and 0.4 PPM) with or without zinc. Results demonstrated that the application of brassinosteroids, combined with zinc stress, significantly enhanced germination percentage (about 47.06, 63.64, and 120%), speed of germination (about 39.13, 50, and 100%), seedling growth (about 38% in case of treatment combined 0.4 PPM 24-EBL and 1.5 mM ZnSO4) and seedling vigor index (204% in case of treatment combined 0.4 PPM 24-EBL and 1.5 mM ZnSO4) compared to zinc-treated seedlings alone after 24 h. The activities of antioxidative enzymes (catalase, ascorbate peroxidase, polyphenol oxidase, and peroxidase) and total soluble protein content decreased, while lipid peroxidation and proline content exhibited a significant increase (p ≤ 0.05) when compared to the control. However, the negative effects induced by heavy metal stress on these parameters were significantly mitigated by EBL application. Notably, the most effective concentration of EBL in overcoming zinc stress was found to be 0.4 PPM. These findings underscore the potential of exogenously applied brassinosteroids as a valuable tool in phytoremediation projects by ameliorating heavy metal stress.
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Affiliation(s)
- Naresh Kumar
- Department of Chemistry and Biochemistry, Eternal University, Rajgarh, India
- Department of Biochemistry, Kurukshetra University, Kurukshetra, India
| | - Vikas Sharma
- ICAR-National Dairy Research Institute, Karnal, India
| | - Gurpreet Kaur
- ICAR-Central Soil Salinity Research Institute, Karnal, India
| | - Charu Lata
- ICAR- Indian Institute of Wheat and Barley Research, RRS, Shimla, India
| | - Hemant Dasila
- Department of Microbiology, Eternal University, Rajgarh, India
| | - Kahkashan Perveen
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Faheema Khan
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Vijay K. Gupta
- Department of Biochemistry, Kurukshetra University, Kurukshetra, India
| | - Mehrun Nisha Khanam
- School of Biological Sciences, College of Natural Sciences, Seoul National University, Seoul, Republic of Korea
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Qiao Y, Ma LY, Chen ZJ, Wang Y, Gu Y, Yang H. OsBR6ox, a member in the brassinosteroid synthetic pathway facilitates degradation of pesticides in rice through a specific DNA demethylation mechanism. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 838:156503. [PMID: 35688248 DOI: 10.1016/j.scitotenv.2022.156503] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Revised: 05/30/2022] [Accepted: 06/01/2022] [Indexed: 06/15/2023]
Abstract
This manuscript described a comprehensive study on a pesticide degradation factor OsBR6ox that promoted the degradation of pesticides atrazine (ATZ) and acetochlor (ACT) in rice tissues and grains through an epigenetic mechanism. OsBR6ox was transcriptionally induced under ATZ and ACT stress. Genetic disruption of OsBR6ox increased rice sensitivity and led to more accumulation of ATZ and ACT, whereas transgenic rice overexpressing OsBR6ox lines (OEs) showed opposite effects with improved growth and lower ATZ and ACT accumulation in various tissues, including grains. OsBR6ox-mediated detoxification of ATZ and ACT was associated with the increased abundance of brassinolide (one of the brassinosteroids, BRs), a plant growth regulator for stress responses. Some Phase I-II reaction protein genes for pesticide detoxification such as genes encoding laccase, O-methyltransferase and glycosyltransferases were transcriptionally upregulated in OE lines under ATZ and ACT stress. HPLC-Q-TOF-MS/MS analysis revealed an enhanced ATZ/ATC metabolism in OE plants, which removed 1.21-1.49 fold ATZ and 1.31-1.44 fold ACT from the growth medium but accumulated only 83.1-87.1 % (shoot) and 71.7-84.1 % (root) of ATZ and 69.4-83.4 % of ACT of the wild-type. Importantly, an ATZ-responsive demethylated region in the upstream of OsBR6ox was detected. Such an epigenetic modification marker was responsible for the increased OsBR6ox expression and consequent detoxification of ATZ/ACT in rice and environment. Overall, this work uncovered a new model showing that plants utilize two mechanisms to co-regulate the detoxification and metabolism of pesticides in rice and provided a new approach for building up cleaner crops and eliminating residual pesticides in environments.
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Affiliation(s)
- Yuxin Qiao
- Jiangsu Key Laboratory of Pesticide Science, College of Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Li Ya Ma
- Jiangsu Key Laboratory of Pesticide Science, College of Sciences, Nanjing Agricultural University, Nanjing 210095, China; Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
| | - Zhao Jie Chen
- Jiangsu Key Laboratory of Pesticide Science, College of Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Yujue Wang
- Syngenta Crop Protection AG, Rosentalstrasse 67, CH-4002 Basel, Switzerland
| | - Yucheng Gu
- Syngenta Ltd, Jealott's Hill International Research Centre, Bracknell, Berkshire RG42 6EY, UK
| | - Hong Yang
- Jiangsu Key Laboratory of Pesticide Science, College of Sciences, Nanjing Agricultural University, Nanjing 210095, China.
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Guo C, Chen Y, Wang M, Du Y, Wu D, Chu J, Yao X. Exogenous brassinolide improves the antioxidant capacity of Pinellia ternata by enhancing the enzymatic and nonenzymatic defense systems under non-stress conditions. FRONTIERS IN PLANT SCIENCE 2022; 13:917301. [PMID: 35958199 PMCID: PMC9358693 DOI: 10.3389/fpls.2022.917301] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Accepted: 06/27/2022] [Indexed: 06/15/2023]
Abstract
Brassinolide (BR) improves the antioxidant capacity of plants under various abiotic stresses. However, it is not clear about the effect of BR on the antioxidant capacity in plants under non-stress conditions. In the present study, the antioxidant defense response of Pinellia ternata was to be assessed by applying BR and propiconazole (Pcz) under non-stress conditions. BR treatment enhanced the flavonoid content, peroxidase, and ascorbate peroxidase (APX) activity by 12.31, 30.62, and 25.08% and led to an increase in 2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity by 4.31% and a decrease in malondialdehyde content by 1.04%. Exogenous application of BR improved the expression levels of PAL, CHS, CHI, and DFR genes by 3. 18-, 3. 39-, 2. 21-, and 0.87-fold in flavonoid biosynthesis, PGI, PMI, and GME genes by 6. 60-, 1437. 79-, and 3.11-fold in ascorbic acid (ASA), biosynthesis, and γECs and GSHS genes by 6.08- and 2.61-fold in glutathione (GSH) biosynthesis pathway, and the expression of these genes were inhibited by Pcz treatment. In addition, BR treatment promoted the ASA-GSH cycle by enhancing the expression of APX, DHAR, and MDHAR genes, which were enhanced by 3. 33-, 157. 85-, and 154.91-fold, respectively. These results provided novel insights into the effect of BR on the antioxidant capacity in bulbil of P. ternata under non-stress conditions and useful knowledge of applying BR to enhance the antioxidant capacity of plants.
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Affiliation(s)
- Chenchen Guo
- School of Life Sciences, Hebei University, Baoding, China
| | - Ying Chen
- School of Life Sciences, Hebei University, Baoding, China
| | - Mengyue Wang
- School of Life Sciences, Hebei University, Baoding, China
| | - Yu Du
- School of Life Sciences, Hebei University, Baoding, China
| | - Dengyun Wu
- School of Life Sciences, Hebei University, Baoding, China
| | - Jianzhou Chu
- School of Life Sciences, Hebei University, Baoding, China
- Institute of Life Sciences and Green Development, Hebei University, Baoding, China
| | - Xiaoqin Yao
- School of Life Sciences, Hebei University, Baoding, China
- Institute of Life Sciences and Green Development, Hebei University, Baoding, China
- Key Laboratory of Microbial Diversity Research and Application of Hebei Province, Baoding, China
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Tian F, Han C, Chen X, Wu X, Mi J, Wan X, Liu Q, He F, Chen L, Yang H, Zhong Y, Qian Z, Zhang F. PscCYP716A1-Mediated Brassinolide Biosynthesis Increases Cadmium Tolerance and Enrichment in Poplar. FRONTIERS IN PLANT SCIENCE 2022; 13:919682. [PMID: 35865284 PMCID: PMC9294640 DOI: 10.3389/fpls.2022.919682] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Accepted: 05/25/2022] [Indexed: 06/15/2023]
Abstract
Cadmium (Cd), as one of the heavy metals with biological poisonousness, seriously suppresses plant growth and does harm to human health. Hence, phytoremediation was proposed to mitigate the negative effects from Cd and restore contaminated soil. However, the internal mechanisms of detoxification of Cd used in phytoremediation are not completely revealed. In this study, we cloned the cytochrome P450 gene PscCYP716A1 from hybrid poplar "Chuanxiang No. 1" and found that the PscCYP716A1 was transcriptionally upregulated by Cd stress and downregulated by the exogenous brassinolide (BR). Meanwhile, PscCYP716A1 significantly promoted the poplar growth and enhanced the Cd accumulation in poplar. Compared to wild-type poplars, overexpressed PscCYP716A1 lines produced higher levels of endogenous BR and showed a stronger tolerance to Cd, which revealed that PscCYP716A1 may reduce the oxidative stress damage induced by Cd stress through accelerating BR synthesis. In general, PscCYP716A1 has a potential superiority in regulating the plant's tolerance to Cd stress, which will provide a scientific basis and a new type of gene-modified poplar for Cd-pollution remediation.
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Affiliation(s)
- Feifei Tian
- College of Landscape Architecture, Sichuan Agricultural University, Chengdu, China
| | - Chengyu Han
- College of Landscape Architecture, Sichuan Agricultural University, Chengdu, China
| | - Xiaoxi Chen
- College of Landscape Architecture, Sichuan Agricultural University, Chengdu, China
| | - Xiaolu Wu
- College of Landscape Architecture, Sichuan Agricultural University, Chengdu, China
| | - Jiaxuan Mi
- College of Forestry, Sichuan Agricultural University, Chengdu, China
| | - Xueqin Wan
- College of Forestry, Sichuan Agricultural University, Chengdu, China
| | - Qinglin Liu
- College of Landscape Architecture, Sichuan Agricultural University, Chengdu, China
| | - Fang He
- College of Forestry, Sichuan Agricultural University, Chengdu, China
| | - Lianghua Chen
- College of Forestry, Sichuan Agricultural University, Chengdu, China
| | - Hanbo Yang
- College of Forestry, Sichuan Agricultural University, Chengdu, China
| | - Yu Zhong
- College of Landscape Architecture, Sichuan Agricultural University, Chengdu, China
| | - Zongliang Qian
- Forestry and Grassland Bureau of Ganzi Prefecture, Kangding, China
| | - Fan Zhang
- College of Landscape Architecture, Sichuan Agricultural University, Chengdu, China
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