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Guo P, Du H, Mao Q, Deng Y, Wang X, Li J, Xiong B, Fan X, Wang D, Agathokleous E, Ma M. The duality of sulfate-reducing bacteria: Reducing methylmercury production in rhizosphere but enhancing accumulation in rice plants. JOURNAL OF HAZARDOUS MATERIALS 2024; 476:135049. [PMID: 38970973 DOI: 10.1016/j.jhazmat.2024.135049] [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: 04/07/2024] [Revised: 06/25/2024] [Accepted: 06/26/2024] [Indexed: 07/08/2024]
Abstract
Sulfate-reducing bacteria (SRB) are known to alter methylmercury (MeHg) production in paddy soil, but the effect of SRB on MeHg dynamics in rhizosphere and rice plants remains to be fully elucidated. The present study investigated the impact of SRB on MeHg levels in unsterilized and γ-sterilized mercury-polluted paddy soils, with the aim to close this knowledge gap. Results showed that the presence of SRB reduced MeHg production by ∼22 % and ∼17 % in the two soils, but elevated MeHg contents by approximately 55 % and 99 % in rice grains, respectively. Similar trend at smaller scales were seen in roots and shoots. SRB inoculation exerted the most profound impact on amino acid metabolism in roots, with the relative response of L-arginine positively linking to MeHg concentrations in rhizosphere. The SRB-induced enrichment of MeHg in rice plants may be interpreted by the stronger presence of endophytic nitrogen-related microbes (e.g. Methylocaldum, Hyphomicrobium and Methylocystis) and TGA transcription factors interacting with glutathione metabolism and calmodulin. Our study provides valuable insights into the complex effects of SRB inoculation on MeHg dynamics in rice ecosystems, and may help to develop strategies to effectively control MeHg accumulation in rice grains.
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Affiliation(s)
- Pan Guo
- Center of Molecular Ecophysiology (CMEP), College of Resources and Environment, Southwest University, Chongqing 400715, PR China
| | - Hongxia Du
- Chongqing Key Laboratory for Innovative Application of Genetic Technology, College of Resources and Environment, Southwest University, Chongqing 400715, PR China
| | - Qiaozhi Mao
- Center of Molecular Ecophysiology (CMEP), College of Resources and Environment, Southwest University, Chongqing 400715, PR China
| | - Yuhan Deng
- Center of Molecular Ecophysiology (CMEP), College of Resources and Environment, Southwest University, Chongqing 400715, PR China; Chongqing Key Laboratory of Agricultural Resources and Environment, College of Resources and Environment, Chongqing 400715, PR China
| | - Xun Wang
- Center of Molecular Ecophysiology (CMEP), College of Resources and Environment, Southwest University, Chongqing 400715, PR China
| | - Jing Li
- School of Chemical and Pharmaceutical Engineering, Chongqing Industry Polytechnic College, Chongqing 401120, PR China
| | - Bingcai Xiong
- Chongqing Key Laboratory for Innovative Application of Genetic Technology, College of Resources and Environment, Southwest University, Chongqing 400715, PR China
| | - Xu Fan
- Center of Molecular Ecophysiology (CMEP), College of Resources and Environment, Southwest University, Chongqing 400715, PR China
| | - Dingyong Wang
- Chongqing Key Laboratory of Agricultural Resources and Environment, College of Resources and Environment, Chongqing 400715, PR China
| | - Evgenios Agathokleous
- Department of Ecology, School of Ecology and Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, PR China
| | - Ming Ma
- Center of Molecular Ecophysiology (CMEP), College of Resources and Environment, Southwest University, Chongqing 400715, PR China; Chongqing Key Laboratory of Agricultural Resources and Environment, College of Resources and Environment, Chongqing 400715, PR China.
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Duan Y, Xu Z, Liu H, Wang Y, Zou X, Zhang Z, Xu L, Xu M. Genome-Wide Identification of the TGA Gene Family and Expression Analysis under Drought Stress in Brassica napus L. Int J Mol Sci 2024; 25:6355. [PMID: 38928064 PMCID: PMC11203523 DOI: 10.3390/ijms25126355] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2024] [Revised: 06/04/2024] [Accepted: 06/05/2024] [Indexed: 06/28/2024] Open
Abstract
TGA transcription factors belong to Group D of the bZIP transcription factors family and play vital roles in the stress response of plants. Brassica napus is an oil crop with rich economic value. However, a systematic analysis of TGA gene family members in B. napus has not yet been reported. In this study, we identified 39 full-length TGA genes in B. napus, renamed TGA1~TGA39. Thirty-nine BnTGA genes were distributed on 18 chromosomes, mainly located in the nucleus, and differences were observed in their 3D structures. Phylogenetic analysis showed that 39 BnTGA genes could be divided into five groups. The BnTGA genes in the same group had similar structure and motif compositions, and all the BnTGA genes had the same conserved bZIP and DOG1 domains. Phylogenetic and synteny analysis showed that the BnTGA genes had a close genetic relationship with the TGA genes of the Brassica juncea, and BnTGA11 and BnTGA29 may play an important role in evolution. In addition, qRT-PCR revealed that three genes (BnTGA14/17/23) showed significant changes in eight experimental materials after drought treatment. Meanwhile, it can be inferred from the results of drought treatment on different varieties of rapeseed that the stress tolerance of parental rapeseed can be transmitted to the offspring through hybridization. In short, these findings have promoted the understanding of the B. napus TGA gene family and will contribute to future research aimed at B. napus resistant breeding.
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Affiliation(s)
- Yi Duan
- College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou 310018, China; (Y.D.); (Z.X.)
| | - Zishu Xu
- College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou 310018, China; (Y.D.); (Z.X.)
| | - Hui Liu
- Institute of Agriculture, The University of Western Australia, Crawley, WA 6009, Australia;
| | - Yanhui Wang
- Leshan Academy of Agricultural Sciences, Leshan 614000, China; (Y.W.); (X.Z.); (Z.Z.)
| | - Xudong Zou
- Leshan Academy of Agricultural Sciences, Leshan 614000, China; (Y.W.); (X.Z.); (Z.Z.)
| | - Zhi Zhang
- Leshan Academy of Agricultural Sciences, Leshan 614000, China; (Y.W.); (X.Z.); (Z.Z.)
| | - Ling Xu
- College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou 310018, China; (Y.D.); (Z.X.)
| | - Mingchao Xu
- Leshan Academy of Agricultural Sciences, Leshan 614000, China; (Y.W.); (X.Z.); (Z.Z.)
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Yang L, Hu X, Ren M, Ma F, Fu J, Cui H. Stem-cell-expressed DEVIL-like small peptides maintain root growth under abiotic stress via abscisic acid signaling. PLANT PHYSIOLOGY 2024; 194:2372-2386. [PMID: 38096479 DOI: 10.1093/plphys/kiad659] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Accepted: 11/13/2023] [Indexed: 04/02/2024]
Abstract
Stem cells are essential to plant growth and development. Through data mining, we identified five DEVIL-like (DVL) small peptide genes that are preferentially expressed in the quiescent center of Arabidopsis (Arabidopsis thaliana) root but whose functions are unknown. When overexpressed, these genes caused a dramatic decrease in root length and pleiotropic phenotypes in the shoot. No root-growth defect was observed in the single-gene mutants, but the quintuple mutant exhibited slightly longer roots than the wild type (WT). Through transcriptome analysis with DVL20-overexpressing plants, we found that many genes involved in abscisic acid (ABA) signaling were regulated by these peptides. Consistent with this finding, we demonstrated that, relative to the WT, DVL20-overexpressing plants were more tolerant whereas the quintuple mutant was more sensitive to ABA. Using RT-qPCR, we showed that ABA signaling-associated genes were affected in an opposite manner when the plants were grown in normal or ABA-containing medium. Strikingly, ectopic expression of ABA signaling genes such as PYRABACTIN RESISTANCE 1-LIKE (PYL) 4, 5, or 6 or suppression of HIGHLY ABA-INDUCED 2 (HAI2) and MITOGEN-ACTIVATED PROTEIN KINASE KINASE KINASE 18 (MAPKKK18) not only largely rescued the root growth defects in DVL20-overexpressing plants in normal growth condition but also conferred tolerance to ABA. Based on these results, we propose that DVL1, 2, 5, 8 and 20 function redundantly in root stem-cell maintenance under abiotic stress, and this role is achieved via ABA signaling.
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Affiliation(s)
- Liyun Yang
- College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Xiaochen Hu
- College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Mengfei Ren
- College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Fei Ma
- College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Jing Fu
- College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Hongchang Cui
- College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China
- Department of Biological Science, Florida State University, Tallahassee, FL 32306, USA
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Lu C, Liu X, Tang Y, Fu Y, Zhang J, Yang L, Li P, Zhu Z, Dong P. A comprehensive review of TGA transcription factors in plant growth, stress responses, and beyond. Int J Biol Macromol 2024; 258:128880. [PMID: 38141713 DOI: 10.1016/j.ijbiomac.2023.128880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2023] [Revised: 11/17/2023] [Accepted: 12/17/2023] [Indexed: 12/25/2023]
Abstract
TGA transcription factors (TFs), belonging to the D clade of the basic region leucine zipper (bZIP) family, exhibit a specific ability to recognize and bind to regulatory elements with TGACG as the core recognition sequence, enabling the regulation of target gene expression and participation in various biological regulatory processes. In plant growth and development, TGA TFs influence organ traits and phenotypes, including initial root length and flowering time. They also play a vital role in responding to abiotic stresses like salt, drought, and cadmium exposure. Additionally, TGA TFs are involved in defending against potential biological stresses, such as fungal bacterial diseases and nematodes. Notably, TGA TFs are sensitive to the oxidative-reductive state within plants and participate in pathways that aid in the elimination of reactive oxygen species (ROS) generated during stressful conditions. TGA TFs also participate in multiple phytohormonal signaling pathways (ABA, SA, etc.). This review thoroughly examines the roles of TGA TFs in plant growth, development, and stress response. It also provides detailed insights into the mechanisms underlying their involvement in physiological and pathological processes, and their participation in plant hormone signaling. This multifaceted exploration distinguishes this review from others, offering a comprehensive understanding of TGA TFs.
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Affiliation(s)
- Chenfei Lu
- School of Life Sciences, Chongqing University, Chongqing 401331, China; College of Bioengineering, Chongqing University, Chongqing 400030, China
| | - Xingyu Liu
- School of Life Sciences, Chongqing University, Chongqing 401331, China
| | - Yuqin Tang
- College of Bioengineering, Chongqing University, Chongqing 400030, China
| | - Yingqi Fu
- School of Life Sciences, Chongqing University, Chongqing 401331, China
| | - Jiaomei Zhang
- School of Life Sciences, Chongqing University, Chongqing 401331, China
| | - Liting Yang
- School of Life Sciences, Chongqing University, Chongqing 401331, China
| | - Peihua Li
- College of Agronomy, Xichang University, Xichang, Sichuan 615013, China
| | - Zhenglin Zhu
- School of Life Sciences, Chongqing University, Chongqing 401331, China.
| | - Pan Dong
- School of Life Sciences, Chongqing University, Chongqing 401331, China; Chongqing Key Laboratory of Biology and Genetic Breeding for Tuber and Root Crops, Chongqing 400716, China.
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Qin Q. ROS: Important factor in plant stem cell fate regulation. JOURNAL OF PLANT PHYSIOLOGY 2023; 289:154082. [PMID: 37690340 DOI: 10.1016/j.jplph.2023.154082] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Revised: 09/01/2023] [Accepted: 09/01/2023] [Indexed: 09/12/2023]
Abstract
Reactive oxygen species (ROS) are initially considered to be toxic byproducts of aerobic metabolic reactions. However, increasing evidence has shown that they have emerged as signaling molecules involved in several basic biological processes. Recent studies highlight the pivotal role of ROS in the maintenance of shoot and root stem cell niche. In this review, we discuss the impact of ROS distribution and their gradients on the stability of the stem cell niches (SCN) in shoot apical meristem (SAM) and root apical meristem (RAM) by determining the balance between stemness and differentiation. We also summarize several important transcription factors that are involved in the regulation of ROS balance in SAM and RAM, regulating key enzymes in ROS metabolism, especially SOD and peroxidase. ROS are also tightly interconnected with phytohormones in the control of the stem cell fate. Besides, ROS are also important regulators of the cell cycle in controlling the size of the stem cells. Understanding the regulation mechanisms of ROS production, polarization gradient distribution, homeostasis, and downstream signal transduction in cells will open exciting new perspectives for plant developmental biology.
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Affiliation(s)
- Qianqian Qin
- Key Laboratory of Cell Activities and Stress Adaptations, Ministry of Education, Key Laboratory of Gene Editing for Breeding, Gansu Province, School of Life Sciences, Lanzhou University, Lanzhou, 730000, China.
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