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Kallemi P, Verret F, Andronis C, Ioannidis N, Glampedakis N, Kotzabasis K, Kalantidis K. Stress-related transcriptomic changes associated with GFP transgene expression and active transgene silencing in plants. Sci Rep 2024; 14:13314. [PMID: 38858413 PMCID: PMC11164987 DOI: 10.1038/s41598-024-63527-5] [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: 03/30/2023] [Accepted: 05/29/2024] [Indexed: 06/12/2024] Open
Abstract
Plants respond to biotic and abiotic stress by activating and interacting with multiple defense pathways, allowing for an efficient global defense response. RNA silencing is a conserved mechanism of regulation of gene expression directed by small RNAs important in acquired plant immunity and especially virus and transgene repression. Several RNA silencing pathways in plants are crucial to control developmental processes and provide protection against abiotic and biotic stresses as well as invasive nucleic acids such as viruses and transposable elements. Various notable studies have shed light on the genes, small RNAs, and mechanisms involved in plant RNA silencing. However, published research on the potential interactions between RNA silencing and other plant stress responses is limited. In the present study, we tested the hypothesis that spreading and maintenance of systemic post-transcriptional gene silencing (PTGS) of a GFP transgene are associated with transcriptional changes that pertain to non-RNA silencing-based stress responses. To this end, we analyzed the structure and function of the photosynthetic apparatus and conducted whole transcriptome analysis in a transgenic line of Nicotiana benthamiana that spontaneously initiates transgene silencing, at different stages of systemic GFP-PTGS. In vivo analysis of chlorophyll a fluorescence yield and expression levels of key photosynthetic genes indicates that photosynthetic activity remains unaffected by systemic GFP-PTGS. However, transcriptomic analysis reveals that spreading and maintenance of GFP-PTGS are associated with transcriptional reprogramming of genes that are involved in abiotic stress responses and pattern- or effector-triggered immunity-based stress responses. These findings suggest that systemic PTGS may affect non-RNA-silencing-based defense pathways in N. benthamiana, providing new insights into the complex interplay between different plant stress responses.
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Affiliation(s)
- Paraskevi Kallemi
- Department of Biology, University of Crete, 70013, Heraklion, Greece
| | - Frederic Verret
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, 70013, Heraklion, Greece
| | - Christos Andronis
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, 70013, Heraklion, Greece
| | | | | | | | - Kriton Kalantidis
- Department of Biology, University of Crete, 70013, Heraklion, Greece.
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, 70013, Heraklion, Greece.
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Xue B, Duan W, Gong L, Zhu D, Li X, Li X, Liang YK. The OsDIR55 gene increases salt tolerance by altering the root diffusion barrier. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2024; 118:1550-1568. [PMID: 38412303 DOI: 10.1111/tpj.16696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2023] [Revised: 01/30/2024] [Accepted: 02/07/2024] [Indexed: 02/29/2024]
Abstract
The increased soil salinity is becoming a major challenge to produce more crops and feed the growing population of the world. In this study, we demonstrated that overexpression of OsDIR55 gene enhances rice salt tolerance by altering the root diffusion barrier. OsDIR55 is broadly expressed in all examined tissues and organs with the maximum expression levels at lignified regions in rice roots. Salt stress upregulates the expression of OsDIR55 gene in an abscisic acid (ABA)-dependent manner. Loss-function and overexpression of OsDIR55 compromised and improved the development of CS and root diffusion barrier, manifested with the decreased and increased width of CS, respectively, and ultimately affected the permeability of the apoplastic diffusion barrier in roots. OsDIR55 deficiency resulted in Na+ accumulation, ionic imbalance, and growth arrest, whereas overexpression of OsDIR55 enhances salinity tolerance and provides an overall benefit to plant growth and yield potential. Collectively, we propose that OsDIR55 is crucial for ions balance control and salt stress tolerance through regulating lignification-mediated root barrier modifications in rice.
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Affiliation(s)
- Baoping Xue
- State Key Laboratory of Hybrid Rice, Department of Plant Sciences, College of Life Sciences, Wuhan University, Wuhan, 430072, China
- Hubei Hongshan Laboratory, Wuhan, 430070, China
| | - Wen Duan
- State Key Laboratory of Hybrid Rice, Department of Plant Sciences, College of Life Sciences, Wuhan University, Wuhan, 430072, China
- Hubei Hongshan Laboratory, Wuhan, 430070, China
| | - Luping Gong
- State Key Laboratory of Hybrid Rice, Department of Plant Sciences, College of Life Sciences, Wuhan University, Wuhan, 430072, China
- Hubei Hongshan Laboratory, Wuhan, 430070, China
| | - Dongmei Zhu
- State Key Laboratory of Hybrid Rice, Department of Plant Sciences, College of Life Sciences, Wuhan University, Wuhan, 430072, China
- Hubei Hongshan Laboratory, Wuhan, 430070, China
| | - Xueying Li
- State Key Laboratory of Hybrid Rice, Department of Plant Sciences, College of Life Sciences, Wuhan University, Wuhan, 430072, China
- Hubei Hongshan Laboratory, Wuhan, 430070, China
| | - Xuemei Li
- State Key Laboratory of Hybrid Rice, Department of Plant Sciences, College of Life Sciences, Wuhan University, Wuhan, 430072, China
- Hubei Hongshan Laboratory, Wuhan, 430070, China
| | - Yun-Kuan Liang
- State Key Laboratory of Hybrid Rice, Department of Plant Sciences, College of Life Sciences, Wuhan University, Wuhan, 430072, China
- Hubei Hongshan Laboratory, Wuhan, 430070, China
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Zhang Y, Song Z, Zhao H, Chen H, Zhao B. Integrative physiological, transcriptomic and metabolomic analysis reveals how the roots of two ornamental Hydrangea macrophylla cultivars cope with lead (Pb) toxicity. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 910:168615. [PMID: 37984650 DOI: 10.1016/j.scitotenv.2023.168615] [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: 08/13/2023] [Revised: 11/12/2023] [Accepted: 11/14/2023] [Indexed: 11/22/2023]
Abstract
Lead (Pb) soil contamination has caused serious ecological and environmental issues. Hydrangea macrophylla is a potential Pb-contaminated soil remediation plant, however, their Pb stress defense mechanism is largely unknown. Here, the physiology, transcriptomic and metabolome of two H. macrophylla cultivars (ML, Pb-sensitive cultivar; JC, Pb-resistant cultivar) under Pb stress were investigated. The results demonstrated that JC performed superiorly, with activities of the antioxidant enzymes superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) were 1.25, 2.84, and 1.67 times higher than those of ML after Pb treatment, respectively, and the amount of soluble sugar in JC increased by 231.34 % compared with that in ML. The electrical conductivity (EC) value of the root exudates of JC was 43.71 % lower than that of ML under Pb stress. The non-targeted metabolomics analysis revealed 193 metabolites grouped into nine categories. Pb stress-induced differential expression of the 37 metabolites, among which the major metabolites up-regulated in ML were organic acids, while in JC, these were carbohydrates, fatty acids, organic acids and lipids. The transcriptomic analysis revealed that Pb exposure induced 1075 and 1314 differentially expressed genes (DEGs) in JC and ML, respectively. According to the functional annotation results, hub genes were primarily enriched in carbohydrate metabolism, root growth, and plant resistance to external stresses. A conjoint analysis of the two omics indicated that the cutin, suberine and wax biosynthesis pathway in JC played an essential role in Pb detoxification. These findings clarify the resistance mechanism of H. macrophylla to Pb stress and open up a new avenue for breeding H. macrophylla Pb-resistant cultivars.
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Affiliation(s)
- Yuyu Zhang
- The College of Landscape Architecture and Arts, Northwest A&F University, Yangling 712100, China
| | - Ziyi Song
- The College of Landscape Architecture and Arts, Northwest A&F University, Yangling 712100, China
| | - Huiqi Zhao
- The College of Landscape Architecture and Arts, Northwest A&F University, Yangling 712100, China
| | - Huan Chen
- The College of Landscape Architecture and Arts, Northwest A&F University, Yangling 712100, China
| | - Bing Zhao
- The College of Landscape Architecture and Arts, Northwest A&F University, Yangling 712100, China.
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Liu T, Kreszies T. The exodermis: A forgotten but promising apoplastic barrier. JOURNAL OF PLANT PHYSIOLOGY 2023; 290:154118. [PMID: 37871477 DOI: 10.1016/j.jplph.2023.154118] [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: 08/18/2023] [Revised: 10/13/2023] [Accepted: 10/15/2023] [Indexed: 10/25/2023]
Abstract
The endodermis and exodermis are widely recognized as two important barriers in plant roots that play a role in regulating the movement of water and ions. While the endodermis is present in nearly all plant roots, the exodermis, characterized by Casparian strips and suberin lamellae is absent in certain plant species. The exodermis can be classified into three types: uniform, dimorphic, and inducible exodermis. Apart from its role in water and ion transport, the exodermis acts as a protective barrier against harmful substances present in the external environment. Furthermore, the exodermis is a complex barrier influenced by various environmental factors, and its resistance to water and ions varies depending on the type of exodermis and the maturity of the root. Therefore, investigations concerning the exodermis necessitate a plant-specific approach. However, our current understanding of the exodermal physiological functions and molecular mechanisms governing its development is limited due to the absence of an exodermis in the model plant Arabidopsis. Due to that, unfortunately, the exodermis has been largely overlooked until now. In this review, we aim to summarize the current fundamental knowledge regarding the exodermis in common research used crop species and propose suggestions for future research endeavors.
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Affiliation(s)
- Tingting Liu
- Institute of Applied Plant Nutrition, University of Göttingen, Carl-Sprengel-Weg 1, 37075, Göttingen, Germany
| | - Tino Kreszies
- Plant Nutrition and Crop Physiology, University of Göttingen, Carl-Sprengel-Weg 1, 37075, Göttingen, Germany.
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Chen X, Chen H, Xu H, Li M, Luo Q, Wang T, Yang Z, Gan S. Effects of drought and rehydration on root gene expression in seedlings of Pinus massoniana Lamb. TREE PHYSIOLOGY 2023; 43:1619-1640. [PMID: 37166353 DOI: 10.1093/treephys/tpad063] [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: 10/16/2022] [Revised: 04/25/2023] [Accepted: 05/08/2023] [Indexed: 05/12/2023]
Abstract
The mechanisms underlying plant response to drought involve the expression of numerous functional and regulatory genes. Transcriptome sequencing based on the second- and/or third-generation high-throughput sequencing platforms has proven to be powerful for investigating the transcriptional landscape under drought stress. However, the full-length transcriptomes related to drought responses in the important conifer genus Pinus L. remained to be delineated using the third-generation sequencing technology. With the objectives of identifying the candidate genes responsible for drought and/or rehydration and clarifying the expression profile of key genes involved in drought regulation, we combined the third- and second-generation sequencing techniques to perform transcriptome analysis on seedling roots under drought stress and rewatering in the drought-tolerant conifer Pinus massoniana Lamb. A sum of 294,114 unique full-length transcripts were produced with a mean length of 3217 bp and N50 estimate of 5075 bp, including 279,560 and 124,438 unique full-length transcripts being functionally annotated and Gene Ontology enriched, respectively. A total of 4076, 6295 and 18,093 differentially expressed genes (DEGs) were identified in three pair-wise comparisons of drought-treatment versus control transcriptomes, including 2703, 3576 and 8273 upregulated and 1373, 2719 and 9820 downregulated DEGs, respectively. Moreover, 157, 196 and 691 DEGs were identified as transcription factors in the three transcriptome comparisons and grouped into 26, 34 and 44 transcription factor families, respectively. Gene Ontology enrichment analysis revealed that a remarkable number of DEGs were enriched in soluble sugar-related and cell wall-related processes. A subset of 75, 68 and 97 DEGs were annotated to be associated with starch, sucrose and raffinose metabolism, respectively, while 32 and 70 DEGs were associated with suberin and lignin biosynthesis, respectively. Weighted gene co-expression network analysis revealed modules and hub genes closely related to drought and rehydration. This study provides novel insights into root transcriptomic changes in response to drought dynamics in Masson pine and serves as a fundamental work for further molecular investigation on drought tolerance in conifers.
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Affiliation(s)
- Xinhua Chen
- State Key Laboratory of Tree Genetics and Breeding, Chinese Academy of Forestry, Xiangshan Road, Beijing 100091, China
- Key Laboratory of State Forestry Administration on Tropical Forestry Research, Research Institute of Tropical Forestry, Chinese Academy of Forestry, 682 Guangshan Road 1, Guangzhou 510520, China
- College of Forestry, Nanjing Forestry University, 159 Longpan Road, Nanjing 210037, China
- Engineering Research Center of Masson Pine of State Forestry Administration & Engineering Research Center of Masson Pine of Guangxi & Guangxi Key Laboratory of Superior Timber Trees Resource Cultivation, Guangxi Forestry Research Institute, 23 Yongwu Road, Nanning 530002, China
| | - Hu Chen
- Engineering Research Center of Masson Pine of State Forestry Administration & Engineering Research Center of Masson Pine of Guangxi & Guangxi Key Laboratory of Superior Timber Trees Resource Cultivation, Guangxi Forestry Research Institute, 23 Yongwu Road, Nanning 530002, China
| | - Huilan Xu
- Engineering Research Center of Masson Pine of State Forestry Administration & Engineering Research Center of Masson Pine of Guangxi & Guangxi Key Laboratory of Superior Timber Trees Resource Cultivation, Guangxi Forestry Research Institute, 23 Yongwu Road, Nanning 530002, China
| | - Mei Li
- State Key Laboratory of Tree Genetics and Breeding, Chinese Academy of Forestry, Xiangshan Road, Beijing 100091, China
- Key Laboratory of State Forestry Administration on Tropical Forestry Research, Research Institute of Tropical Forestry, Chinese Academy of Forestry, 682 Guangshan Road 1, Guangzhou 510520, China
| | - Qunfeng Luo
- Engineering Research Center of Masson Pine of State Forestry Administration & Engineering Research Center of Masson Pine of Guangxi & Guangxi Key Laboratory of Superior Timber Trees Resource Cultivation, Guangxi Forestry Research Institute, 23 Yongwu Road, Nanning 530002, China
| | - Ting Wang
- Engineering Research Center of Masson Pine of State Forestry Administration & Engineering Research Center of Masson Pine of Guangxi & Guangxi Key Laboratory of Superior Timber Trees Resource Cultivation, Guangxi Forestry Research Institute, 23 Yongwu Road, Nanning 530002, China
| | - Zhangqi Yang
- Engineering Research Center of Masson Pine of State Forestry Administration & Engineering Research Center of Masson Pine of Guangxi & Guangxi Key Laboratory of Superior Timber Trees Resource Cultivation, Guangxi Forestry Research Institute, 23 Yongwu Road, Nanning 530002, China
| | - Siming Gan
- State Key Laboratory of Tree Genetics and Breeding, Chinese Academy of Forestry, Xiangshan Road, Beijing 100091, China
- Key Laboratory of State Forestry Administration on Tropical Forestry Research, Research Institute of Tropical Forestry, Chinese Academy of Forestry, 682 Guangshan Road 1, Guangzhou 510520, China
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Georgieva K, Mihailova G, Gigova L, Popova AV, Velitchkova M, Simova-Stoilova L, Sági-Kazár M, Zelenyánszki H, Solymosi K, Solti Á. Antioxidative Defense, Suppressed Nitric Oxide Accumulation, and Synthesis of Protective Proteins in Roots and Leaves Contribute to the Desiccation Tolerance of the Resurrection Plant Haberlea rhodopensis. PLANTS (BASEL, SWITZERLAND) 2023; 12:2834. [PMID: 37570988 PMCID: PMC10421438 DOI: 10.3390/plants12152834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Revised: 07/27/2023] [Accepted: 07/28/2023] [Indexed: 08/13/2023]
Abstract
The desiccation tolerance of plants relies on defense mechanisms that enable the protection of macromolecules, biological structures, and metabolism. Although the defense of leaf tissues exposed to solar irradiation is challenging, mechanisms that protect the viability of the roots, yet largely unexplored, are equally important for survival. Although the photosynthetic apparatus in leaves contributes to the generation of oxidative stress under drought stress, we hypothesized that oxidative stress and thus antioxidative defense is also predominant in the roots. Thus, we aimed for a comparative analysis of the protective mechanisms in leaves and roots during the desiccation of Haberlea rhodopensis. Consequently, a high content of non-enzymatic antioxidants and high activity of antioxidant enzymes together with the activation of specific isoenzymes were found in both leaves and roots during the final stages of desiccation of H. rhodopensis. Among others, catalase and glutathione reductase activity showed a similar tendency of changes in roots and leaves, whereas, unlike that in the leaves, superoxide dismutase activity was enhanced under severe but not under medium desiccation in roots. Nitric oxide accumulation in the root tips was found to be sensitive to water restriction but suppressed under severe desiccation. In addition to the antioxidative defense, desiccation induced an enhanced abundance of dehydrins, ELIPs, and sHSP 17.7 in leaves, but this was significantly better in roots. In contrast to leaf cells, starch remained in the cells of the central cylinder of desiccated roots. Taken together, protective compounds and antioxidative defense mechanisms are equally important in protecting the roots to survive desiccation. Since drought-induced damage to the root system fundamentally affects the survival of plants, a better understanding of root desiccation tolerance mechanisms is essential to compensate for the challenges of prolonged dry periods.
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Affiliation(s)
- Katya Georgieva
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Academic Georgi Bonchev Str., Building 21, 1113 Sofia, Bulgaria; (G.M.); (L.G.); (L.S.-S.)
| | - Gergana Mihailova
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Academic Georgi Bonchev Str., Building 21, 1113 Sofia, Bulgaria; (G.M.); (L.G.); (L.S.-S.)
| | - Liliana Gigova
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Academic Georgi Bonchev Str., Building 21, 1113 Sofia, Bulgaria; (G.M.); (L.G.); (L.S.-S.)
| | - Antoaneta V. Popova
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Academic Georgi Bonchev Str., Building 21, 1113 Sofia, Bulgaria; (A.V.P.); (M.V.)
| | - Maya Velitchkova
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Academic Georgi Bonchev Str., Building 21, 1113 Sofia, Bulgaria; (A.V.P.); (M.V.)
| | - Lyudmila Simova-Stoilova
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Academic Georgi Bonchev Str., Building 21, 1113 Sofia, Bulgaria; (G.M.); (L.G.); (L.S.-S.)
| | - Máté Sági-Kazár
- Department of Plant Physiology and Molecular Plant Biology, Institute of Biology, ELTE Eötvös Loránd University, Pázmány Péter Sétány 1/C, H-1117 Budapest, Hungary; (M.S.-K.); (H.Z.); (Á.S.)
- Doctoral School of Biology, Institute of Biology, ELTE Eötvös Loránd University, Pázmány Péter Sétány 1/C, H-1117 Budapest, Hungary
| | - Helga Zelenyánszki
- Department of Plant Physiology and Molecular Plant Biology, Institute of Biology, ELTE Eötvös Loránd University, Pázmány Péter Sétány 1/C, H-1117 Budapest, Hungary; (M.S.-K.); (H.Z.); (Á.S.)
- Doctoral School of Biology, Institute of Biology, ELTE Eötvös Loránd University, Pázmány Péter Sétány 1/C, H-1117 Budapest, Hungary
| | - Katalin Solymosi
- Department of Plant Anatomy, Institute of Biology, ELTE Eötvös Loránd University, Pázmány Péter Sétány 1/C, H-1117 Budapest, Hungary;
| | - Ádám Solti
- Department of Plant Physiology and Molecular Plant Biology, Institute of Biology, ELTE Eötvös Loránd University, Pázmány Péter Sétány 1/C, H-1117 Budapest, Hungary; (M.S.-K.); (H.Z.); (Á.S.)
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Wang L, Li Z, Zhang G, Liang X, Hu L, Li Y, He Y, Zhan F. Dark septate endophyte Exophiala pisciphila promotes maize growth and alleviates cadmium toxicity. Front Microbiol 2023; 14:1165131. [PMID: 37113231 PMCID: PMC10126344 DOI: 10.3389/fmicb.2023.1165131] [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: 02/13/2023] [Accepted: 03/16/2023] [Indexed: 04/29/2023] Open
Abstract
Dark septate endophytes (DSE) are typical root endophytes with the ability to enhance plant growth and tolerance to heavy metals, but the underlying mechanisms are unclear. Here, the physiological and molecular mechanisms of a DSE strain, Exophiala pisciphila, in mitigating cadmium (Cd, 20 mg/kg) toxicity in maize were investigated. Our results showed, under Cd stress, E. pisciphila inoculation enhanced the biomass of maize and reduced both inorganic and soluble forms of Cd (high toxicity) by 52.6% in maize leaves, which may be potentially contributing to Cd toxicity mitigation. Besides, E. pisciphila inoculation significantly affected the expression of genes involved in the signal transduction and polar transport of phytohormone, and then affected abscisic acid (ABA) and indole-3-acetic acid (IAA) contents in maize roots, which was the main reason for promoting maize growth. In addition, E. pisciphila also made a 27% increase in lignin content by regulating the expression of genes involved in the synthesis of it, which was beneficial to hinder the transport of Cd. In addition, E. pisciphila inoculation also activated glutathione metabolism by the up-regulation of genes related to glutathione S-transferase. This study helps to elucidate the functions of E. pisciphila under Cd stress, sheds light on the mechanism of detoxifying Cd and provides new insights into the protection of crops from heavy metals.
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Affiliation(s)
- Lei Wang
- College of Resources and Environment, Yunnan Agricultural University, Kunming, China
| | - Zuran Li
- College of Horticulture and Landscape, Yunnan Agricultural University, Kunming, China
| | - Guangqun Zhang
- College of Resources and Environment, Yunnan Agricultural University, Kunming, China
| | - Xinran Liang
- College of Resources and Environment, Yunnan Agricultural University, Kunming, China
| | - Linyan Hu
- College of Resources and Environment, Yunnan Agricultural University, Kunming, China
| | - Yuan Li
- College of Resources and Environment, Yunnan Agricultural University, Kunming, China
| | - Yongmei He
- College of Resources and Environment, Yunnan Agricultural University, Kunming, China
| | - Fangdong Zhan
- College of Resources and Environment, Yunnan Agricultural University, Kunming, China
- *Correspondence: Fangdong Zhan,
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Chen A, Liu T, Wang Z, Chen X. Plant root suberin: A layer of defence against biotic and abiotic stresses. FRONTIERS IN PLANT SCIENCE 2022; 13:1056008. [PMID: 36507443 PMCID: PMC9732430 DOI: 10.3389/fpls.2022.1056008] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Accepted: 11/11/2022] [Indexed: 05/27/2023]
Abstract
Plant roots have important functions, such as acquiring nutrients and water from the surrounding soil and transporting them upwards to the shoots. Simultaneously, they must be able to exclude potentially harmful substances and prevent the entry of pathogens into the roots. The endodermis surrounds the vascular tissues and forms hydrophobic diffusion barriers including Casparian strips and suberin lamella. Suberin in cell walls can be induced by a range of environmental factors and contribute to against biotic and abiotic threats. Tremendous progress has been made in biosynthesis of suberin and its function, little is known about the effect of its plasticity and distribution on stress tolerance. In field conditions, biotic and abiotic stress can exist at the same time, and little is known about the change of suberization under that condition. This paper update the progress of research related to suberin biosynthesis and its function, and also discuss the change of suberization in plant roots and its role on biotic and abiotic stresses tolerance.
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Affiliation(s)
- Anle Chen
- Interdisciplinary Research Center for Agriculture Green Development in Yangtze River Basin, and College of Resources and Environment, Southwest University, Chongqing, China
| | - Tong Liu
- Interdisciplinary Research Center for Agriculture Green Development in Yangtze River Basin, and College of Resources and Environment, Southwest University, Chongqing, China
| | - Zhou Wang
- College of Plant Protection, Southwest University, Chongqing, China
| | - Xinping Chen
- Interdisciplinary Research Center for Agriculture Green Development in Yangtze River Basin, and College of Resources and Environment, Southwest University, Chongqing, China
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Liu Z, Huang S, Fan Y, Yu Y, Wang Q, Li H, Wan Y. Sulfur reduces arsenic accumulation in rice shoot by enhancing root retention and altering arsenic metabolism. CHEMOSPHERE 2022; 305:135080. [PMID: 35623425 DOI: 10.1016/j.chemosphere.2022.135080] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Revised: 04/25/2022] [Accepted: 05/20/2022] [Indexed: 06/15/2023]
Abstract
Rice can potentially pose serious health risks due to its higher arsenic (As) uptake. Sulfur (S) is not only an essential macronutrient, but it also has the ability to decrease As accumulation. In the present study, a hydroponic experiment was conducted to investigate the mechanisms underlying the effects of S on the As uptake and transport at different S (pre-)treatments and additional supply levels. It was found that additional S supply decreased As content by 20%-50% in both S-deficient and S-normal pre-treated shoots compared to the no S supply throughout the treatment; As root-to-shoot translocation factors was reduced by 7%-46% with S supply. On the one hand, additional S supply could elevate levels of thiol compounds (by 15%-280%) and increase the As percentage in soluble cytosol of roots. Additional S supply also enhanced the casparian strip development of rice roots, which could block As transfer in roots apoplast pathway. Moreover, additional S supply lead to the down-regulation of OsLsi2 expression (e.g., reduced by 71% by S at 2 mmol L-1 with the S-normal pre-treatment). Sulfur also promoted the biotransformation of As(III) in shoots into less toxic As species; reducing the As(III) proportion by 25% by 2 mmol L-1 of S under S-normal pre-treatment. These results suggest that S could play an important role in the inhibition of As transfer and the detoxification of As in rice by enhancing root retention (the vacuole sequestration), impeding transportation pathway of root apoplast, and regulating As-related gene expression. Thus, providing a basis for the potential application of S in rice production in As-contaminated paddy soil.
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Affiliation(s)
- Zhe Liu
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, Key Laboratory of Plant-Soil Interactions of the Ministry of Education, College of Resources and Environmental Sciences, China Agricultural University, Beijing, 100193, China
| | - Siyu Huang
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, Key Laboratory of Plant-Soil Interactions of the Ministry of Education, College of Resources and Environmental Sciences, China Agricultural University, Beijing, 100193, China
| | - Yu Fan
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, Key Laboratory of Plant-Soil Interactions of the Ministry of Education, College of Resources and Environmental Sciences, China Agricultural University, Beijing, 100193, China
| | - Yao Yu
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, Key Laboratory of Plant-Soil Interactions of the Ministry of Education, College of Resources and Environmental Sciences, China Agricultural University, Beijing, 100193, China
| | - Qi Wang
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, Key Laboratory of Plant-Soil Interactions of the Ministry of Education, College of Resources and Environmental Sciences, China Agricultural University, Beijing, 100193, China
| | - Huafen Li
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, Key Laboratory of Plant-Soil Interactions of the Ministry of Education, College of Resources and Environmental Sciences, China Agricultural University, Beijing, 100193, China
| | - Yanan Wan
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, Key Laboratory of Plant-Soil Interactions of the Ministry of Education, College of Resources and Environmental Sciences, China Agricultural University, Beijing, 100193, China.
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Feng T, Wu P, Gao H, Kosma DK, Jenks MA, Lü S. Natural variation in root suberization is associated with local environment in Arabidopsis thaliana. THE NEW PHYTOLOGIST 2022; 236:385-398. [PMID: 35751382 DOI: 10.1111/nph.18341] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Accepted: 06/16/2022] [Indexed: 06/15/2023]
Abstract
Genetic signature of climate adaptation has been widely recognized across the genome of many organisms; however, the eco-physiological basis for linking genomic polymorphisms with local adaptations remains largely unexplored. Using a panel of 218 world-wide Arabidopsis accessions, we characterized the natural variation in root suberization by quantifying 16 suberin monomers. We explored the associations between suberization traits and 126 climate variables. We conducted genome-wide association analysis and integrated previous genotype-environment association (GEA) to identify the genetic bases underlying suberization variation and their involvements in climate adaptation. Root suberin content displays extensive variation across Arabidopsis populations and significantly correlates with local moisture gradients and soil characteristics. Specifically, enhanced suberization is associated with drier environments, higher soil cation-exchange capacity, and lower soil pH; higher proportional levels of very-long-chain suberin is negatively correlated with moisture availability, lower soil gravel content, and higher soil silt fraction. We identified 94 putative causal loci and experimentally proved that GPAT6 is involved in C16 suberin biosynthesis. Highly significant associations between the putative genes and environmental variables were observed. Roots appear highly responsive to environmental heterogeneity via regulation of suberization, especially the suberin composition. The patterns of suberization-environment correlation and the suberin-related GEA fit the expectations of local adaptation for the polygenic suberization trait.
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Affiliation(s)
- Tao Feng
- State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan, 430062, China
- Hubei Hongshan Laboratory, Wuhan, 430070, China
| | - Pan Wu
- State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan, 430062, China
| | - Huani Gao
- State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan, 430062, China
| | - Dylan K Kosma
- Department of Biochemistry and Molecular Biology, University of Nevada, Reno, Reno, NV, 89557, USA
| | - Matthew A Jenks
- School of Plant Sciences, College of Agriculture and Life Sciences, The University of Arizona, Tucson, AZ, 85721, USA
| | - Shiyou Lü
- State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan, 430062, China
- Hubei Hongshan Laboratory, Wuhan, 430070, China
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11
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Cesarino I. With a little help from MYB friends: Transcriptional network controlling root suberization and lignification. PLANT PHYSIOLOGY 2022; 190:1077-1079. [PMID: 35781733 PMCID: PMC9516726 DOI: 10.1093/plphys/kiac318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Accepted: 06/11/2022] [Indexed: 06/15/2023]
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12
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Grünhofer P, Stöcker T, Guo Y, Li R, Lin J, Ranathunge K, Schoof H, Schreiber L. Populus × canescens root suberization in reaction to osmotic and salt stress is limited to the developing younger root tip region. PHYSIOLOGIA PLANTARUM 2022; 174:e13765. [PMID: 36281836 DOI: 10.1111/ppl.13765] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Revised: 08/05/2022] [Accepted: 08/12/2022] [Indexed: 06/16/2023]
Abstract
Populus is a valuable and fast-growing tree species commonly cultivated for economic and scientific purposes. But most of the poplar species are sensitive to drought and salt stress. Thus, we compared the physiological effects of osmotic stress (PEG8000) and salt treatment (NaCl) on poplar roots to identify potential strategies for future breeding or genetic engineering approaches. We investigated root anatomy using epifluorescence microscopy, changes in root suberin composition and amount using gas chromatography, transcriptional reprogramming using RNA sequencing, and modifications of root transport physiology using a pressure chamber. Poplar roots reacted to the imposed stress conditions, especially in the developing younger root tip region, with remarkable differences between both types of stress. Overall, the increase in suberin content was surprisingly small, but the expression of key suberin biosynthesis genes was strongly induced. Significant reductions of the radial water transport in roots were only observed for the osmotic and not the hydrostatic hydraulic conductivity. Our data indicate that the genetic enhancement of root suberization processes in poplar might be a promising target to convey increased tolerance, especially against toxic sodium chloride.
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Affiliation(s)
- Paul Grünhofer
- Department of Ecophysiology, Institute of Cellular and Molecular Botany, University of Bonn, Bonn, Germany
| | - Tyll Stöcker
- Department of Crop Bioinformatics, Institute of Crop Science and Resource Conservation, University of Bonn, Bonn, Germany
| | - Yayu Guo
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Forestry University, Beijing, China
- College of Biological Science and Technology, Beijing Forestry University, Beijing, China
- Institute of Tree Development and Genome Editing, Beijing Forestry University, Beijing, China
| | - Ruili Li
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Forestry University, Beijing, China
- College of Biological Science and Technology, Beijing Forestry University, Beijing, China
- Institute of Tree Development and Genome Editing, Beijing Forestry University, Beijing, China
| | - Jinxing Lin
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Forestry University, Beijing, China
- College of Biological Science and Technology, Beijing Forestry University, Beijing, China
- Institute of Tree Development and Genome Editing, Beijing Forestry University, Beijing, China
| | - Kosala Ranathunge
- UWA School of Biological Sciences, The University of Western Australia, Perth, Western Australia, Australia
| | - Heiko Schoof
- Department of Crop Bioinformatics, Institute of Crop Science and Resource Conservation, University of Bonn, Bonn, Germany
| | - Lukas Schreiber
- Department of Ecophysiology, Institute of Cellular and Molecular Botany, University of Bonn, Bonn, Germany
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13
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Liu Y, Lu M, Persson DP, Luo J, Liang Y, Li T. The involvement of nitric oxide and ethylene on the formation of endodermal barriers in response to Cd in hyperaccumulator Sedum alfredii. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 307:119530. [PMID: 35636714 DOI: 10.1016/j.envpol.2022.119530] [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: 02/08/2022] [Revised: 05/08/2022] [Accepted: 05/21/2022] [Indexed: 06/15/2023]
Abstract
Nitric oxide (NO) and ethylene are both important signaling molecules which participate in numerous plant development processes and environmental stress resistance. Here, we investigate whether and how NO interacts with ethylene during the development of endodermal barriers that have major consequences for the apoplastic uptake of cadmium (Cd) in the hyperaccumulator Sedum alfredii. In response to Cd, an increased NO accumulation, while a decrease in ethylene production was observed in the roots of S. alfredii. Exogenous supplementation of NO donor SNP (sodium nitroprusside) decreased the ethylene production in roots, while NO scavenger cPTIO (2-(4-carboxyphenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide) had the opposite effect. The exogenous addition of NO affected the ethylene production through regulating the expression of genes related to ethylene synthesis. However, upon exogenous ethylene addition, roots retained their NO accumulation. The abovementioned results suggest that ethylene is downstream of the NO signaling pathway in S. alfredii. Regardless of Cd, addition of SNP promoted the deposition of endodermal barriers via regulating the genes related to Casparian strips deposition and suberization. Correlation analyses indicate that NO positively modifies the formation of endodermal barriers via the NO-ethylene signaling pathway, Cd-induced NO accumulation interferes with the synthesis of ethylene, leading to a deposition of endodermal barriers in S. alfredii.
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Affiliation(s)
- Yuankun Liu
- Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China; Department of Plant and Environmental Sciences, Facility of Science, University of Copenhagen, Frederiksberg, 1870, Denmark
| | - Min Lu
- Tea Research Institute, Shandong Academy of Agricultural Sciences, Jinan, 250100, China
| | - Daniel Pergament Persson
- Department of Plant and Environmental Sciences, Facility of Science, University of Copenhagen, Frederiksberg, 1870, Denmark
| | - Jipeng Luo
- Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Yongchao Liang
- Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Tingqiang Li
- Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China; National Demonstration Center for Experimental Environment and Resources Education, Zhejiang University, Hangzhou, 310058, China; Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Hangzhou, 310058, China.
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14
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Leal AR, Belo J, Beeckman T, Barros PM, Oliveira MM. The Combined Effect of Heat and Osmotic Stress on Suberization of Arabidopsis Roots. Cells 2022; 11:cells11152341. [PMID: 35954186 PMCID: PMC9367520 DOI: 10.3390/cells11152341] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Revised: 07/19/2022] [Accepted: 07/25/2022] [Indexed: 02/04/2023] Open
Abstract
The simultaneous occurrence of heat stress and drought is becoming more regular as a consequence of climate change, causing extensive agricultural losses. The application of either heat or osmotic stress increase cell-wall suberization in different tissues, which may play a role in improving plant resilience. In this work, we studied how the suberization process is affected by the combination of drought and heat stress by following the expression of suberin biosynthesis genes, cell-wall suberization and the chemical composition in Arabidopsis roots. The Arabidopsis plants used in this study were at the onset of secondary root development. At this point, one can observe a developmental gradient in the main root, with primary development closer to the root tip and secondary development, confirmed by the suberized phellem, closer to the shoot. Remarkably, we found a differential response depending on the root zone. The combination of drought and heat stress increased cell wall suberization in main root segments undergoing secondary development and in lateral roots (LRs), while the main root zone, at primary development stage, was not particularly affected. We also found differences in the overall chemical composition of the cell walls in both root zones in response to combined stress. The data gathered showed that, under combined drought and heat stress, Arabidopsis roots undergo differential cell wall remodeling depending on developmental stage, with modifications in the biosynthesis and/or assembly of major cell wall components.
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Affiliation(s)
- Ana Rita Leal
- Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa (ITQB NOVA), GPlantS, Av. da República, 2780-157 Oeiras, Portugal; (A.R.L.); (J.B.)
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Technologiepark 71, 9052 Ghent, Belgium;
- Center for Plant Systems Biology, VIB, Technologiepark 71, 9052 Ghent, Belgium
| | - Joana Belo
- Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa (ITQB NOVA), GPlantS, Av. da República, 2780-157 Oeiras, Portugal; (A.R.L.); (J.B.)
| | - Tom Beeckman
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Technologiepark 71, 9052 Ghent, Belgium;
- Center for Plant Systems Biology, VIB, Technologiepark 71, 9052 Ghent, Belgium
| | - Pedro M. Barros
- Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa (ITQB NOVA), GPlantS, Av. da República, 2780-157 Oeiras, Portugal; (A.R.L.); (J.B.)
- Correspondence: (P.M.B.); (M.M.O.)
| | - M. Margarida Oliveira
- Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa (ITQB NOVA), GPlantS, Av. da República, 2780-157 Oeiras, Portugal; (A.R.L.); (J.B.)
- Correspondence: (P.M.B.); (M.M.O.)
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15
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Xiao Z, Ye M, Gao Z, Jiang Y, Zhang X, Nikolic N, Liang Y. Silicon Reduces Aluminum-Induced Suberization by Inhibiting the Uptake and Transport of Aluminum in Rice Roots and Consequently Promotes Root Growth. PLANT & CELL PHYSIOLOGY 2022; 63:340-352. [PMID: 34981810 DOI: 10.1093/pcp/pcac001] [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: 05/11/2021] [Revised: 12/26/2021] [Accepted: 01/03/2022] [Indexed: 06/14/2023]
Abstract
Silicon (Si) can alleviate aluminum (Al) toxicity in rice (Oryza sativa L.), but the mechanisms underlying this beneficial effect have not been elucidated, especially under long-term Al stress. Here, the effects of Al and Si on the suberization and development of rice roots were investigated. The results show that, as the Al exposure time increased, the roots accumulated more Al, and Al enhanced the deposition of suberin in roots, both of which ultimately inhibited root growth and nutrient absorption. However, Si restricted the apoplastic and symplastic pathways of Al in roots by inhibiting the uptake and transport of Al, thereby reducing the accumulation of Al in roots. Meanwhile, the Si-induced drop in Al concentration reduced the suberization of roots caused by Al through down-regulating the expression of genes related to suberin synthesis and then promoted the development of roots (such as longer and more adventitious roots and lateral roots). Moreover, Si also increased nutrient uptake by Al-stressed roots and thence promoted the growth of rice. Overall, these results indicate that Si reduced Al-induced suberization of roots by inhibiting the uptake and transport of Al in roots, thereby amending root growth and ultimately alleviating Al stress in rice. Our study further clarified the toxicity mechanism of Al in rice and the role of Si in reducing Al content and restoring root development under Al stress.
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Affiliation(s)
- Zhuoxi Xiao
- Ministry of Education Key Laboratory of Environment Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, 866 Yuhangtang Rd, Hangzhou, Zhejiang 310058, China
| | - Mujun Ye
- Ministry of Education Key Laboratory of Environment Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, 866 Yuhangtang Rd, Hangzhou, Zhejiang 310058, China
| | - Zixiang Gao
- Ministry of Education Key Laboratory of Environment Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, 866 Yuhangtang Rd, Hangzhou, Zhejiang 310058, China
| | - Yishun Jiang
- Ministry of Education Key Laboratory of Environment Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, 866 Yuhangtang Rd, Hangzhou, Zhejiang 310058, China
| | - Xinyuan Zhang
- Ministry of Education Key Laboratory of Environment Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, 866 Yuhangtang Rd, Hangzhou, Zhejiang 310058, China
| | - Nina Nikolic
- Institute for Multidisciplinary Research, University of Belgrade, 1 Studentski trg, Belgrade 11000, Serbia
| | - Yongchao Liang
- Ministry of Education Key Laboratory of Environment Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, 866 Yuhangtang Rd, Hangzhou, Zhejiang 310058, China
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16
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Grünhofer P, Guo Y, Li R, Lin J, Schreiber L. Hydroponic cultivation conditions allowing the reproducible investigation of poplar root suberization and water transport. PLANT METHODS 2021; 17:129. [PMID: 34911563 PMCID: PMC8672600 DOI: 10.1186/s13007-021-00831-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Accepted: 12/07/2021] [Indexed: 06/14/2023]
Abstract
BACKGROUND With increasing joint research cooperation on national and international levels, there is a high need for harmonized and reproducible cultivation conditions and experimental protocols in order to ensure the best comparability and reliability of acquired data. As a result, not only comparisons of findings of different laboratories working with the same species but also of entirely different species would be facilitated. As Populus is becoming an increasingly important genus in modern science and agroforestry, the integration of findings with previously gained knowledge of other crop species is of high significance. RESULTS To ease and ensure the comparability of investigations of root suberization and water transport, on a high degree of methodological reproducibility, we set up a hydroponics-based experimental pipeline. This includes plant cultivation, root histochemistry, analytical investigation, and root water transport measurement. A 5-week-long hydroponic cultivation period including an optional final week of stress application resulted in a highly consistent poplar root development. The poplar roots were of conical geometry and exhibited a typical Casparian band development with subsequent continuously increasing suberization of the endodermis. Poplar root suberin was composed of the most frequently described suberin substance classes, but also high amounts of benzoic acid derivatives could be identified. Root transport physiology experiments revealed that poplar roots in this developmental stage have a two- to tenfold higher hydrostatic than osmotic hydraulic conductivity. Lastly, the hydroponic cultivation allowed the application of gradually defined osmotic stress conditions illustrating the precise adjustability of hydroponic experiments as well as the previously reported sensitivity of poplar plants to water deficits. CONCLUSIONS By maintaining a high degree of harmonization, we were able to compare our results to previously published data on root suberization and water transport of barley and other crop species. Regarding hydroponic poplar cultivation, we enabled high reliability, reproducibility, and comparability for future experiments. In contrast to abiotic stress conditions applied during axenic tissue culture cultivation, this experimental pipeline offers great advantages including the growth of roots in the dark, easy access to root systems before, during, and after stress conditions, and the more accurate definition of the developmental stages of the roots.
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Affiliation(s)
- Paul Grünhofer
- Department of Ecophysiology, Institute of Cellular and Molecular Botany, University of Bonn, Kirschallee 1, 53115, Bonn, Germany.
| | - Yayu Guo
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Forestry University, Beijing, 10083, China
- College of Biological Science and Technology, Beijing Forestry University, Beijing, 100083, China
- Institute of Tree Development and Genome Editing, Beijing Forestry University, Beijing, 100083, China
| | - Ruili Li
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Forestry University, Beijing, 10083, China
- College of Biological Science and Technology, Beijing Forestry University, Beijing, 100083, China
- Institute of Tree Development and Genome Editing, Beijing Forestry University, Beijing, 100083, China
| | - Jinxing Lin
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Forestry University, Beijing, 10083, China
- College of Biological Science and Technology, Beijing Forestry University, Beijing, 100083, China
- Institute of Tree Development and Genome Editing, Beijing Forestry University, Beijing, 100083, China
| | - Lukas Schreiber
- Department of Ecophysiology, Institute of Cellular and Molecular Botany, University of Bonn, Kirschallee 1, 53115, Bonn, Germany
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17
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Calvo‐Polanco M, Ribeyre Z, Dauzat M, Reyt G, Hidalgo‐Shrestha C, Diehl P, Frenger M, Simonneau T, Muller B, Salt DE, Franke RB, Maurel C, Boursiac Y. Physiological roles of Casparian strips and suberin in the transport of water and solutes. THE NEW PHYTOLOGIST 2021; 232:2295-2307. [PMID: 34617285 PMCID: PMC9298204 DOI: 10.1111/nph.17765] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Accepted: 08/02/2021] [Indexed: 05/09/2023]
Abstract
The formation of Casparian strips (CS) and the deposition of suberin at the endodermis of plant roots are thought to limit the apoplastic transport of water and ions. We investigated the specific role of each of these apoplastic barriers in the control of hydro-mineral transport by roots and the consequences on shoot growth. A collection of Arabidopsis thaliana mutants defective in suberin deposition and/or CS development was characterized under standard conditions using a hydroponic system and the Phenopsis platform. Mutants altered in suberin deposition had enhanced root hydraulic conductivity, indicating a restrictive role for this compound in water transport. In contrast, defective CS directly increased solute leakage and indirectly reduced root hydraulic conductivity. Defective CS also led to a reduction in rosette growth, which was partly dependent on the hydro-mineral status of the plant. Ectopic suberin was shown to partially compensate for defective CS phenotypes. Altogether, our work shows that the functionality of the root apoplastic diffusion barriers greatly influences the plant physiology, and that their integrity is tightly surveyed.
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Affiliation(s)
- Monica Calvo‐Polanco
- BPMPUniv MontpellierCNRSINRAEInstitut Agro34060MontpellierFrance
- Excellence Unit AGRIENVIRONMENTCIALEUniversity of Salamanca37185SalamancaSpain
| | - Zoe Ribeyre
- LEPSEUniv MontpellierINRAEInstitut Agro34060MontpellierFrance
| | - Myriam Dauzat
- LEPSEUniv MontpellierINRAEInstitut Agro34060MontpellierFrance
| | - Guilhem Reyt
- Future Food Beacon of Excellence and the School of BiosciencesUniversity of NottinghamNottinghamLE12 5RDUK
| | | | - Patrick Diehl
- Institute of Cellular and Molecular BotanyUniversity of Bonn53115BonnGermany
| | - Marc Frenger
- Institute of Cellular and Molecular BotanyUniversity of Bonn53115BonnGermany
| | | | - Bertrand Muller
- LEPSEUniv MontpellierINRAEInstitut Agro34060MontpellierFrance
| | - David E. Salt
- Future Food Beacon of Excellence and the School of BiosciencesUniversity of NottinghamNottinghamLE12 5RDUK
| | - Rochus B. Franke
- Institute of Cellular and Molecular BotanyUniversity of Bonn53115BonnGermany
| | | | - Yann Boursiac
- BPMPUniv MontpellierCNRSINRAEInstitut Agro34060MontpellierFrance
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18
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Artur MAS, Kajala K. Convergent evolution of gene regulatory networks underlying plant adaptations to dry environments. PLANT, CELL & ENVIRONMENT 2021; 44:3211-3222. [PMID: 34196969 PMCID: PMC8518057 DOI: 10.1111/pce.14143] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Accepted: 06/25/2021] [Indexed: 05/21/2023]
Abstract
Plants transitioned from an aquatic to a terrestrial lifestyle during their evolution. On land, fluctuations on water availability in the environment became one of the major problems they encountered. The appearance of morpho-physiological adaptations to cope with and tolerate water loss from the cells was undeniably useful to survive on dry land. Some of these adaptations, such as carbon concentrating mechanisms (CCMs), desiccation tolerance (DT) and root impermeabilization, appeared in multiple plant lineages. Despite being crucial for evolution on land, it has been unclear how these adaptations convergently evolved in the various plant lineages. Recent advances on whole genome and transcriptome sequencing are revealing that co-option of genes and gene regulatory networks (GRNs) is a common feature underlying the convergent evolution of these adaptations. In this review, we address how the study of CCMs and DT has provided insight into convergent evolution of GRNs underlying plant adaptation to dry environments, and how these insights could be applied to currently emerging understanding of evolution of root impermeabilization through different barrier cell types. We discuss examples of co-option, conservation and innovation of genes and GRNs at the cell, tissue and organ levels revealed by recent phylogenomic (comparative genomic) and comparative transcriptomic studies.
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Affiliation(s)
- Mariana A. S. Artur
- Laboratory of Plant PhysiologyWageningen UniversityWageningenThe Netherlands
- Plant Ecophysiology, Institute of Environmental BiologyUtrecht UniversityUtrechtThe Netherlands
| | - Kaisa Kajala
- Plant Ecophysiology, Institute of Environmental BiologyUtrecht UniversityUtrechtThe Netherlands
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19
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Shukla V, Han JP, Cléard F, Lefebvre-Legendre L, Gully K, Flis P, Berhin A, Andersen TG, Salt DE, Nawrath C, Barberon M. Suberin plasticity to developmental and exogenous cues is regulated by a set of MYB transcription factors. Proc Natl Acad Sci U S A 2021. [PMID: 34551972 DOI: 10.1101/2021.01.27.428267] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/29/2023] Open
Abstract
Suberin is a hydrophobic biopolymer that can be deposited at the periphery of cells, forming protective barriers against biotic and abiotic stress. In roots, suberin forms lamellae at the periphery of endodermal cells where it plays crucial roles in the control of water and mineral transport. Suberin formation is highly regulated by developmental and environmental cues. However, the mechanisms controlling its spatiotemporal regulation are poorly understood. Here, we show that endodermal suberin is regulated independently by developmental and exogenous signals to fine-tune suberin deposition in roots. We found a set of four MYB transcription factors (MYB41, MYB53, MYB92, and MYB93), each of which is individually regulated by these two signals and is sufficient to promote endodermal suberin. Mutation of these four transcription factors simultaneously through genome editing leads to a dramatic reduction in suberin formation in response to both developmental and environmental signals. Most suberin mutants analyzed at physiological levels are also affected in another endodermal barrier made of lignin (Casparian strips) through a compensatory mechanism. Through the functional analysis of these four MYBs, we generated plants allowing unbiased investigation of endodermal suberin function, without accounting for confounding effects due to Casparian strip defects, and were able to unravel specific roles of suberin in nutrient homeostasis.
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Affiliation(s)
- Vinay Shukla
- Department of Botany and Plant Biology, University of Geneva, 1211 Geneva, Switzerland
| | - Jian-Pu Han
- Department of Botany and Plant Biology, University of Geneva, 1211 Geneva, Switzerland
| | - Fabienne Cléard
- Department of Botany and Plant Biology, University of Geneva, 1211 Geneva, Switzerland
| | | | - Kay Gully
- Department of Molecular Plant Biology, University of Lausanne, 1015 Lausanne, Switzerland
| | - Paulina Flis
- Future Food Beacon of Excellence and School of Biosciences, University of Nottingham, NG7 2RD Nottingham, United Kingdom
| | - Alice Berhin
- Department of Molecular Plant Biology, University of Lausanne, 1015 Lausanne, Switzerland
| | - Tonni G Andersen
- Department of Molecular Plant Biology, University of Lausanne, 1015 Lausanne, Switzerland
| | - David E Salt
- Future Food Beacon of Excellence and School of Biosciences, University of Nottingham, NG7 2RD Nottingham, United Kingdom
| | - Christiane Nawrath
- Department of Molecular Plant Biology, University of Lausanne, 1015 Lausanne, Switzerland
| | - Marie Barberon
- Department of Botany and Plant Biology, University of Geneva, 1211 Geneva, Switzerland;
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20
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Shukla V, Han JP, Cléard F, Lefebvre-Legendre L, Gully K, Flis P, Berhin A, Andersen TG, Salt DE, Nawrath C, Barberon M. Suberin plasticity to developmental and exogenous cues is regulated by a set of MYB transcription factors. Proc Natl Acad Sci U S A 2021; 118:e2101730118. [PMID: 34551972 PMCID: PMC8488582 DOI: 10.1073/pnas.2101730118] [Citation(s) in RCA: 49] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/22/2021] [Indexed: 11/18/2022] Open
Abstract
Suberin is a hydrophobic biopolymer that can be deposited at the periphery of cells, forming protective barriers against biotic and abiotic stress. In roots, suberin forms lamellae at the periphery of endodermal cells where it plays crucial roles in the control of water and mineral transport. Suberin formation is highly regulated by developmental and environmental cues. However, the mechanisms controlling its spatiotemporal regulation are poorly understood. Here, we show that endodermal suberin is regulated independently by developmental and exogenous signals to fine-tune suberin deposition in roots. We found a set of four MYB transcription factors (MYB41, MYB53, MYB92, and MYB93), each of which is individually regulated by these two signals and is sufficient to promote endodermal suberin. Mutation of these four transcription factors simultaneously through genome editing leads to a dramatic reduction in suberin formation in response to both developmental and environmental signals. Most suberin mutants analyzed at physiological levels are also affected in another endodermal barrier made of lignin (Casparian strips) through a compensatory mechanism. Through the functional analysis of these four MYBs, we generated plants allowing unbiased investigation of endodermal suberin function, without accounting for confounding effects due to Casparian strip defects, and were able to unravel specific roles of suberin in nutrient homeostasis.
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Affiliation(s)
- Vinay Shukla
- Department of Botany and Plant Biology, University of Geneva, 1211 Geneva, Switzerland
| | - Jian-Pu Han
- Department of Botany and Plant Biology, University of Geneva, 1211 Geneva, Switzerland
| | - Fabienne Cléard
- Department of Botany and Plant Biology, University of Geneva, 1211 Geneva, Switzerland
| | | | - Kay Gully
- Department of Molecular Plant Biology, University of Lausanne, 1015 Lausanne, Switzerland
| | - Paulina Flis
- Future Food Beacon of Excellence and School of Biosciences, University of Nottingham, NG7 2RD Nottingham, United Kingdom
| | - Alice Berhin
- Department of Molecular Plant Biology, University of Lausanne, 1015 Lausanne, Switzerland
| | - Tonni G Andersen
- Department of Molecular Plant Biology, University of Lausanne, 1015 Lausanne, Switzerland
| | - David E Salt
- Future Food Beacon of Excellence and School of Biosciences, University of Nottingham, NG7 2RD Nottingham, United Kingdom
| | - Christiane Nawrath
- Department of Molecular Plant Biology, University of Lausanne, 1015 Lausanne, Switzerland
| | - Marie Barberon
- Department of Botany and Plant Biology, University of Geneva, 1211 Geneva, Switzerland;
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21
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Lukacova Z, Bokor B, Vavrova S, Soltys K, Vaculik M. Divergence of reactions to arsenic (As) toxicity in tobacco (Nicotiana benthamiana) plants: A lesson from peroxidase involvement. JOURNAL OF HAZARDOUS MATERIALS 2021; 417:126049. [PMID: 34000701 DOI: 10.1016/j.jhazmat.2021.126049] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Revised: 03/25/2021] [Accepted: 05/03/2021] [Indexed: 06/12/2023]
Abstract
To evaluate the multiplicity of reactions to toxic metalloid arsenic (As) with specific emphasis on the role of plant peroxidases, a model plant Nicotiana benthamiana was cultivated in in vitro conditions at various doses of As (applied as As5+ up to 80 μM). After 28-day cultivation, several physiological characteristics such as plant growth, photosynthetic pigment concentration, As concentration, peroxidase (POX) expression levels, and POX activity were evaluated. A newly sequenced gene for POX has been identified, that belongs to the Class III plant extracellular peroxidases, and its relationship to the genus Solanum as the most relative species has been confirmed. In the control and selected As treatments (20As, 50As, and 80As), newly identified POX expression and POX activity were continuously detected during the whole cultivation period. The plant reactions to As stress were distinguished into three groups: low As, moderate As, and high As. A tight relationship was found between the photosynthetic pigments and POX expression. Accumulation of As in roots and shoots showed correlations with POX activities. The results showed that the diversity of reactions depends on As dose and time exposure and indicate an interface of peroxidase functional role with other physiological processes in plants suffering from As toxicity.
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Affiliation(s)
- Zuzana Lukacova
- Department of Plant Physiology, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská dolina, Ilkovičova 6, 842 15 Bratislava, Slovak Republic.
| | - Boris Bokor
- Department of Plant Physiology, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská dolina, Ilkovičova 6, 842 15 Bratislava, Slovak Republic; Comenius University Science Park, Ilkovičova 8, 841 04 Bratislava, Slovak Republic
| | - Silvia Vavrova
- Department of Molecular Biology, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská dolina, Ilkovičova 6, 842 15 Bratislava, Slovak Republic
| | - Katarina Soltys
- Department of Microbiology and Virology, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská dolina, Ilkovičova 6, 842 15 Bratislava, Slovak Republic
| | - Marek Vaculik
- Department of Plant Physiology, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská dolina, Ilkovičova 6, 842 15 Bratislava, Slovak Republic
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22
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Tamang BG, Li S, Rajasundaram D, Lamichhane S, Fukao T. Overlapping and stress-specific transcriptomic and hormonal responses to flooding and drought in soybean. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2021; 107:100-117. [PMID: 33864651 DOI: 10.1111/tpj.15276] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 02/19/2021] [Accepted: 04/08/2021] [Indexed: 06/12/2023]
Abstract
Flooding and drought are serious constraints that reduce crop productivity worldwide. Previous studies identified genes conferring tolerance to both water extremes in various plants. However, overlapping responses to flooding and drought at the genome-scale remain obscure. Here, we defined overlapping and stress-specific transcriptomic and hormonal responses to submergence, drought and recovery from these stresses in soybean (Glycine max). We performed comparative RNA-sequencing and hormone profiling, identifying genes, hormones and biological processes that are differentially regulated in an overlapping or stress-specific manner. Overlapping responses included positive regulation of trehalose and sucrose metabolism and negative regulation of cellulose, tubulin, photosystem II and I, and chlorophyll biosynthesis, facilitating the economization of energy reserves under both submergence and drought. Additional energy-consuming pathways were restricted in a stress-specific manner. Downregulation of distinct pathways for energy saving under each stress suggests energy-consuming processes that are relatively unnecessary for each stress adaptation are turned down. Our newly developed transcriptomic-response analysis revealed that abscisic acid and ethylene responses were activated in common under both stresses, whereas stimulated auxin response was submergence-specific. The energy-saving strategy is the key overlapping mechanism that underpins adaptation to both submergence and drought in soybean. Abscisic acid and ethylene are candidate hormones that coordinate transcriptomic energy-saving processes under both stresses. Auxin may be a signaling component that distinguishes submergence-specific regulation of the stress response.
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Affiliation(s)
- Bishal G Tamang
- Virginia Tech, School of Plant and Environmental Sciences, Blacksburg, VA, 24061, USA
- Department of Plant Biology and Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
| | - Song Li
- Virginia Tech, School of Plant and Environmental Sciences, Blacksburg, VA, 24061, USA
| | - Dhivyaa Rajasundaram
- Virginia Tech, School of Plant and Environmental Sciences, Blacksburg, VA, 24061, USA
- Department of Pediatrics, University of Pittsburg, Pittsburg, PA, 15224, USA
| | - Suman Lamichhane
- Virginia Tech, School of Plant and Environmental Sciences, Blacksburg, VA, 24061, USA
| | - Takeshi Fukao
- Virginia Tech, School of Plant and Environmental Sciences, Blacksburg, VA, 24061, USA
- Department of Bioscience and Biotechnology, Fukui Prefectural University, Eiheiji, Fukui, 910-1195, Japan
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23
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Plant Biology: New Insight into How Roots 'Mask Up'. Curr Biol 2021; 31:R263-R265. [PMID: 33689729 DOI: 10.1016/j.cub.2021.01.083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Extra- and trans-cellular barriers are essential for root function under even mild stress. New research shows that establishing both the lignin and suberin barriers in the Arabidopsis endodermis requires phenylpropanoid biosynthesis by endodermal cells themselves.
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24
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Lux A, Kohanová J, White PJ. The secrets of calcicole species revealed. JOURNAL OF EXPERIMENTAL BOTANY 2021; 72:968-970. [PMID: 33626153 PMCID: PMC7904150 DOI: 10.1093/jxb/eraa555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
This article comments on: Kotula L, Clode PL, Ranathunge K, Lambers H. 2021. Role of roots in adaptation of soil-indifferent Proteaceae to calcareous soils in south-western Australia. Journal of Experimental Botany 72, 1490–1505.
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Affiliation(s)
- Alexander Lux
- Department of Plant Physiology, Faculty of Natural Sciences, Comenius University in Bratislava, Bratislava, Slovakia
- Institute of Chemistry, Slovak Academy of Sciences, Bratislava, Slovakia
| | - Jana Kohanová
- Department of Plant Physiology, Faculty of Natural Sciences, Comenius University in Bratislava, Bratislava, Slovakia
| | - Philip J White
- Ecological Sciences Department, The James Hutton Institute, Invergowrie, UK
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25
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Yadav V, Arif N, Kováč J, Singh VP, Tripathi DK, Chauhan DK, Vaculík M. Structural modifications of plant organs and tissues by metals and metalloids in the environment: A review. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2021; 159:100-112. [PMID: 33359959 DOI: 10.1016/j.plaphy.2020.11.047] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Accepted: 11/24/2020] [Indexed: 06/12/2023]
Abstract
At the dawn of the industrial revolution, the exorbitant use of heavy metals and toxic elements by mankind unfurls a powerful and complex web of hazard all around the world that significantly contributed to unprecedented trends in environmental degradation. Plants as sessile organisms, that cannot escape from the stress directly, have adapted to this environment via concurrent configurations of several traits. Among them the anatomy has been identified as much more advanced field of research that brought the explosion of interest among the expertise and its prodigious importance in stress physiology is unavoidable. In conjunction with various other disciplines, like physiology, biochemistry, genomics and metabolomics, the plant anatomy provides a large data sets that are paving the way towards a comprehensive and holistic understanding of plant growth, development, defense and productivity under heavy metal and toxic element stress. Present paper advances our recent knowledge about structural alterations of plant tissues induced by metals and metalloids, like antimony (Sb), arsenic (As), aluminium (Al), copper (Cu), cadmium (Cd), chromium (Cr), lead (Pb), manganese (Mn), mercury (Hg), nickel (Ni) and zinc (Zn) and points on essential role of plant anatomy and its understanding for plant growth and development in changing environment. Understanding of anatomical adaptations of various plant organs and tissues to heavy metals and metalloids could greatly contribute to integral and modern approach for investigation of plants in changing environmental conditions. These findings are necessary for understanding of the whole spectra of physiological and biochemical reactions in plants and to maintain the crop productivity worldwide. Moreover, our holistic perception regarding the processes underlying the plant responses to metal(loids) at anatomical level are needed for improving crop management and breeding techniques.
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Affiliation(s)
- Vaishali Yadav
- D. D. Pant Interdisciplinary Research Lab, Department of Botany, University of Allahabad, Allahabad, 211 002, India
| | - Namira Arif
- D. D. Pant Interdisciplinary Research Lab, Department of Botany, University of Allahabad, Allahabad, 211 002, India
| | - Ján Kováč
- Department of Plant Physiology, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská dolina B2, Ilkovičova 6, SK-842 15, Bratislava, Slovakia; Department of Phytology, Faculty of Forestry, Technical University in Zvolen, T. G. Masaryka 24, 960 01, Zvolen, Slovakia
| | - Vijay Pratap Singh
- Department of Botany, C.M.P. Degree College, A Constituent PG College of University of Allahabad, Allahabad, 211002, India
| | - Durgesh Kumar Tripathi
- Amity Institute of Organic Agriculture, Amity University Uttar Pradesh, I 2 Block, 5th Floor, AUUP Campus Sector-125, Noida, 201313, India.
| | - Devendra Kumar Chauhan
- D. D. Pant Interdisciplinary Research Lab, Department of Botany, University of Allahabad, Allahabad, 211 002, India.
| | - Marek Vaculík
- Department of Plant Physiology, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská dolina B2, Ilkovičova 6, SK-842 15, Bratislava, Slovakia; Institute of Botany, Plant Science and Biodiversity Centre, Slovak Academy of Sciences, Dúbravská cesta 9, SK-845 23, Bratislava, Slovakia.
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26
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Karahara I, Horie T. Functions and structure of roots and their contributions to salinity tolerance in plants. BREEDING SCIENCE 2021; 71:89-108. [PMID: 33762879 PMCID: PMC7973495 DOI: 10.1270/jsbbs.20123] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Accepted: 12/15/2020] [Indexed: 05/03/2023]
Abstract
Soil salinity is an increasing threat to the productivity of glycophytic crops worldwide. The root plays vital roles under various stress conditions, including salinity, as well as has diverse functions in non-stress soil environments. In this review, we focus on the essential functions of roots such as in ion homeostasis mediated by several different membrane transporters and signaling molecules under salinity stress and describe recent advances in the impacts of quantitative trait loci (QTLs) or genetic loci (and their causal genes, if applicable) on salinity tolerance. Furthermore, we introduce important literature for the development of barriers against the apoplastic flow of ions, including Na+, as well as for understanding the functions and components of the barrier structure under salinity stress.
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Affiliation(s)
- Ichirou Karahara
- Department of Biology, Faculty of Science, University of Toyama, Toyama 930-8555, Japan
| | - Tomoaki Horie
- Division of Applied Biology, Faculty of Textile Science and Technology, Shinshu University, 3-15-1 Tokida, Ueda, Nagano 386-8567, Japan
- Corresponding author (e-mail: )
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27
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Silva BRS, Batista BL, Lobato AKS. Anatomical changes in stem and root of soybean plants submitted to salt stress. PLANT BIOLOGY (STUTTGART, GERMANY) 2021; 23:57-65. [PMID: 32841475 DOI: 10.1111/plb.13176] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Accepted: 08/03/2020] [Indexed: 06/11/2023]
Abstract
The soybean is a legume that is widely cultivated in many countries due to the high levels of protein and oil contained in its seed, and is used for human and animal nutrition. However, salinity affects more than 800 million hectares worldwide, limiting global agricultural production. The aim of this research was to evaluate the structural behaviour of the roots and stems under progressive salt stress, detailing the possible anatomical modifications to these organs in soybean plants during this stress. The plants were randomized into five treatments (0, 50, 100, 150 and 200 mm NaCl). All the root regions studied and exposed to 100 mm Na+ exhibited increases in the epidermis and endodermis and formation of lysogenic aerenchyma with increasing salinity, revealing the protective roles of these structures in reducing Na+ influx. In the stem, increases in the cortex and pith in the first internode subject to 100 mm Na+ suggest anatomical responses that aim to minimize oxidative stress. Soybean plants subjected to progressive salt stress (>50 mm Na+ ) avoided cavitation and loss of function linked to vessel elements, reducing the metaxylem in all the root and stem regions analysed. Finally, our results confirm anatomical changes to the roots and stems.
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Affiliation(s)
- B R S Silva
- Núcleo de Pesquisa Vegetal Básica e Aplicada, Universidade Federal Rural da Amazônia. Paragominas, Pará, Brazil
| | - B L Batista
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André, São Paulo, Brazil
| | - A K S Lobato
- Núcleo de Pesquisa Vegetal Básica e Aplicada, Universidade Federal Rural da Amazônia. Paragominas, Pará, Brazil
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28
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Vaculík M, Lukačová Z, Bokor B, Martinka M, Tripathi DK, Lux A. Alleviation mechanisms of metal(loid) stress in plants by silicon: a review. JOURNAL OF EXPERIMENTAL BOTANY 2020; 71:6744-6757. [PMID: 32569367 DOI: 10.1093/jxb/eraa288] [Citation(s) in RCA: 54] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Accepted: 06/15/2020] [Indexed: 05/06/2023]
Abstract
Silicon (Si), although not considered as an essential element for plants in general, can ameliorate the phytotoxicity induced by excess metal(loid)s whether non-essential (e.g. Cd, Pb, Cr, Al, As, and Sb) or essential (e.g. Cu, Ni, and Zn). The Si-enhanced resistance allowing plants to cope with this type of abiotic stress has been developed at multiple levels in plants. Restriction of root uptake and immobilization of metal(loid)s in the rhizosphere by Si is probably one of the first defence mechanism. Further, retention of elements in the root apoplasm might enhance the resistance and vigour of plants. At the cellular level, the formation of insoluble complexes between Si and metal(loid)s and their storage within cell walls help plants to decrease available element concentration and restrict symplasmic uptake. Moreover, Si influences the oxidative status of plants by modifying the activity of various antioxidants, improves membrane stability, and acts on gene expression, although its exact role in these processes is still not well understood. This review focuses on all currently known plant-based mechanisms related to Si supply and involved in amelioration of stress caused by excess metal(loid)s.
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Affiliation(s)
- Marek Vaculík
- Department of Plant Physiology, Faculty of Natural Sciences, Comenius University in Bratislava, Bratislava, Ilkovicova 6, Bratislava, Slovakia
- Institute of Botany, Plant Science and Biodiversity Centre, Slovak Academy of Sciences, Dubravska cesta 9, Bratislava, Slovakia
| | - Zuzana Lukačová
- Department of Plant Physiology, Faculty of Natural Sciences, Comenius University in Bratislava, Bratislava, Ilkovicova 6, Bratislava, Slovakia
| | - Boris Bokor
- Department of Plant Physiology, Faculty of Natural Sciences, Comenius University in Bratislava, Bratislava, Ilkovicova 6, Bratislava, Slovakia
- Comenius University Science Park, Ilkovicova 8, Bratislava, Slovakia
| | - Michal Martinka
- Department of Plant Physiology, Faculty of Natural Sciences, Comenius University in Bratislava, Bratislava, Ilkovicova 6, Bratislava, Slovakia
| | - Durgesh Kumar Tripathi
- Amity Institute of Organic Agriculture, Amity University Uttar Pradesh, Sect 125, Noida, Uttar Pradesh, India
| | - Alexander Lux
- Department of Plant Physiology, Faculty of Natural Sciences, Comenius University in Bratislava, Bratislava, Ilkovicova 6, Bratislava, Slovakia
- Institute of Chemistry, Slovak Academy of Sciences, Dubravska cesta 9, Bratislava, Slovakia
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29
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Wang X, Zhang Y, Wang L, Pan Z, He S, Gao Q, Chen B, Gong W, Du X. Casparian strip membrane domain proteins in Gossypium arboreum: genome-wide identification and negative regulation of lateral root growth. BMC Genomics 2020; 21:340. [PMID: 32366264 PMCID: PMC7199351 DOI: 10.1186/s12864-020-6723-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Accepted: 04/06/2020] [Indexed: 11/28/2022] Open
Abstract
Background Root systems are critical for plant growth and development. The Casparian strip in root systems is involved in stress resistance and maintaining homeostasis. Casparian strip membrane domain proteins (CASPs) are responsible for the formation of Casparian strips. Results To investigate the function of CASPs in cotton, we identified and characterized 48, 54, 91 and 94 CASPs from Gossypium arboreum, Gossypium raimondii, Gossypium barbadense and Gossypium hirsutum, respectively, at the genome-wide level. However, only 29 common homologous CASP genes were detected in the four Gossypium species. A collinearity analysis revealed that whole genome duplication (WGD) was the primary reason for the expansion of the genes of the CASP family in the four cotton species. However, dispersed duplication could also contribute to the expansion of the GaCASPs gene family in the ancestors of G. arboreum. Phylogenetic analysis was used to cluster a total of 85 CASP genes from G. arboreum and Arabidopsis into six distinct groups, while the genetic structure and motifs of CASPs were conserved in the same group. Most GaCASPs were expressed in diverse tissues, with the exception of that five GaCASPs (Ga08G0113, Ga08G0114, Ga08G0116, Ga08G0117 and Ga08G0118) that were highly expressed in root tissues. Analyses of the tissue and subcellular localization suggested that GaCASP27 genes (Ga08G0117) are membrane protein genes located in the root. In the GaCASP27 silenced plants and the Arabidopsis mutants, the lateral root number significantly increased. Furthermore, GaMYB36, which is related to root development was found to regulate lateral root growth by targeting GaCASP27. Conclusions This study provides a fundamental understanding of the CASP gene family in cotton and demonstrates the regulatory role of GaCASP27 on lateral root growth and development.
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Affiliation(s)
- Xiaoyang Wang
- State Key Laboratory of Cotton Biology, Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang, 455000, Henan, China.,Crop Information Center, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Yuanming Zhang
- Crop Information Center, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Liyuan Wang
- State Key Laboratory of Cotton Biology, Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang, 455000, Henan, China
| | - Zhaoe Pan
- State Key Laboratory of Cotton Biology, Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang, 455000, Henan, China
| | - Shoupu He
- State Key Laboratory of Cotton Biology, Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang, 455000, Henan, China
| | - Qiong Gao
- State Key Laboratory of Cotton Biology, Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang, 455000, Henan, China
| | - Baojun Chen
- State Key Laboratory of Cotton Biology, Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang, 455000, Henan, China
| | - Wenfang Gong
- State Key Laboratory of Cotton Biology, Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang, 455000, Henan, China. .,Key Laboratory of Cultivation and Protection for Non-Wood Forest Trees, Ministry of Education, Central South University of Forestry and Technology, Ministry of Education, Changsha, 410004, China.
| | - Xiongming Du
- State Key Laboratory of Cotton Biology, Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang, 455000, Henan, China.
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30
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Namyslov J, Bauriedlová Z, Janoušková J, Soukup A, Tylová E. Exodermis and Endodermis Respond to Nutrient Deficiency in Nutrient-Specific and Localized Manner. PLANTS (BASEL, SWITZERLAND) 2020; 9:E201. [PMID: 32041139 PMCID: PMC7076471 DOI: 10.3390/plants9020201] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Revised: 01/31/2020] [Accepted: 02/03/2020] [Indexed: 02/07/2023]
Abstract
The exodermis is a common apoplastic barrier of the outer root cortex, with high environmentally-driven plasticity and a protective function. This study focused on the trade-off between the protective advantages provided by the exodermis and its disadvantageous reduction of cortical membrane surface area accessible by apoplastic route, thus limiting nutrient acquisition from the rhizosphere. We analysed the effect of nutrient deficiency (N, P, K, Mg, Ca, K, Fe) on exodermal and endodermal differentiation in maize. To differentiate systemic and localized effects, nutrient deficiencies were applied in three different approaches: to the root system as a whole, locally to discrete parts, or on one side of a single root. Our study showed that the establishment of the exodermis was enhanced in low-N and low-P plants, but delayed in low-K plants. The split-root cultivation proved that the effect is non-systemic, but locally coordinated for individual roots. Within a single root, localized deficiencies didn't result in an evenly differentiated exodermis, in contrast to other stress factors. The maturation of the endodermis responded in a similar way. In conclusion, N, P, and K deficiencies strongly modulated exodermal differentiation. The response was nutrient specific and integrated local signals of current nutrient availability from the rhizosphere.
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Affiliation(s)
| | | | | | | | - Edita Tylová
- Department of Experimental Plant Biology, Faculty of Science, Charles University, Vinicna 5, 128 44 Prague 2, Czech Republic
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31
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Ramakrishna P, Barberon M. Polarized transport across root epithelia. CURRENT OPINION IN PLANT BIOLOGY 2019; 52:23-29. [PMID: 31323542 DOI: 10.1016/j.pbi.2019.05.010] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2019] [Revised: 05/22/2019] [Accepted: 05/23/2019] [Indexed: 06/10/2023]
Abstract
Plant roots explore the soil to acquire water and nutrients which are often available at concentrations that drastically differ from the plant's actual need for growth and development. This stark difference between availability and requirement can be dealt with owing to the root's architecture as an inverted gut. In roots, the two epithelial characteristics (selective acquisition and diffusion barrier) are split between two cell layers: the epidermis at the root periphery and the endodermis as the innermost cortical cell layer around the vasculature. Polarized transport of nutrients across the root epithelium can be achieved through different pathways: apoplastic, symplastic, or coupled transcellular. This review highlights different features of the root that allow this polarized transport. Special emphasis is placed on the coupled transcellular pathway, facilitated by polarized nutrient carriers along root cell layers but barred by suberin lamellae in endodermal cells.
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Affiliation(s)
- Priya Ramakrishna
- Department of Botany and Plant Biology, University of Geneva, 30 Quai Ernest Ansermet, 1211 Geneva, Switzerland
| | - Marie Barberon
- Department of Botany and Plant Biology, University of Geneva, 30 Quai Ernest Ansermet, 1211 Geneva, Switzerland.
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32
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Abstract
Roots provide the primary mechanism that plants use to absorb water and nutrients from their environment. These functions are dependent on developmental mechanisms that direct root growth and branching into regions of soil where these resources are relatively abundant. Water is the most limiting factor for plant growth, and its availability is determined by the weather, soil structure, and salinity. In this review, we define the developmental pathways that regulate the direction of growth and branching pattern of the root system, which together determine the expanse of soil from which a plant can access water. The ability of plants to regulate development in response to the spatial distribution of water is a focus of many recent studies and provides a model for understanding how biological systems utilize positional cues to affect signaling and morphogenesis. A better understanding of these processes will inform approaches to improve crop water use efficiency to more sustainably feed a growing population.
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Affiliation(s)
- José R. Dinneny
- Department of Biology, Stanford University, Stanford, California 94305, USA
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Yue L, Chen F, Yu K, Xiao Z, Yu X, Wang Z, Xing B. Early development of apoplastic barriers and molecular mechanisms in juvenile maize roots in response to La 2O 3 nanoparticles. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 653:675-683. [PMID: 30759593 DOI: 10.1016/j.scitotenv.2018.10.320] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2018] [Revised: 10/20/2018] [Accepted: 10/24/2018] [Indexed: 05/27/2023]
Abstract
The increasing occurrence of engineered nanoparticles (NPs) in soils may decrease water uptake in crops, followed by lower crop yield and quality. As one of the most common rare earth oxide NPs, lanthanum oxide (La2O3) NPs may inhibit the relative expressions of aquaporin genes, thus reduce water uptake. In the present study, maize plants were exposed to different La2O3 NPs concentrations (0, 5, 50 mg L-1) for 72 h and 144 h right after the first leaf extended completely. Our results revealed that water uptake was reduced by La2O3 NPs through accelerating the development of apoplastic barriers in maize roots. The level of abscisic acid, determined by using ultra high performance liquid chromatography-tandem mass spectrometry, was increased upon La2O3 NPs exposure. Furthermore, ZmPAL, ZmCCR2 and ZmCAD6, the core genes specific for biosynthesis of lignin, were up-regulated by 3-13 fold in roots exposed to 50 mg L-1 La2O3 NPs. However, ZmF5H was suppressed, indicating that lignin with S units could be excluded for the formed lignin in apoplastic barriers upon La2O3 NPs exposure. The level of essential component of apoplastic barriers - lignin was increased by 1.5-fold. The early development of apoplastic barriers was observed, and stomatal conductance and transpiration rate of La2O3 NPs-treated plants were significantly decreased by 63%-83% and 42%-86%, respectively, as compared to the control. The lignin enriched apoplastic barriers in juvenile maize thus led to the reduction of water uptake, subsequently causing significant growth inhibition. This is the first study to show early development of root apoplastic barriers upon La2O3 NPs exposure. This study will help us better understand the function of apoplastic barriers in roots in response to NPs, further providing fundamental knowledge to develop safer and more efficient agricultural nanotechnology.
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Affiliation(s)
- Le Yue
- Institute of Environmental Processes and Pollution Control, and School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China
| | - Feiran Chen
- Institute of Environmental Processes and Pollution Control, and School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China
| | - Kaiqiang Yu
- College of Environmental Science and Engineering, and Ministry of Education Key Laboratory of Marine Environment and Ecology, Ocean University of China, Qingdao 266100, China
| | - Zhenggao Xiao
- Institute of Environmental Processes and Pollution Control, and School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China
| | - Xiaoyu Yu
- College of Environmental Science and Engineering, and Ministry of Education Key Laboratory of Marine Environment and Ecology, Ocean University of China, Qingdao 266100, China
| | - Zhenyu Wang
- Institute of Environmental Processes and Pollution Control, and School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China.
| | - Baoshan Xing
- Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA 01003, United States.
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Kohanová J, Martinka M, Vaculík M, White PJ, Hauser MT, Lux A. Root hair abundance impacts cadmium accumulation in Arabidopsis thaliana shoots. ANNALS OF BOTANY 2018; 122:903-914. [PMID: 29394308 PMCID: PMC6215042 DOI: 10.1093/aob/mcx220] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Accepted: 01/08/2018] [Indexed: 05/30/2023]
Abstract
BACKGROUND AND AIMS Root hairs increase the contact area of roots with soil and thereby enhance the capacity for solute uptake. The strict hair/non-hair pattern of Arabidopsis thaliana can change with nutrient deficiency or exposure to toxic elements, which modify root hair density. The effects of root hair density on cadmium (Cd) accumulation in shoots of arabidopsis genotypes with altered root hair development and patterning were studied. METHODS Arabidopsis mutants that are unable to develop root hairs (rhd6-1 and cpc/try) or produce hairy roots (wer/myb23) were compared with the ecotype Columbia (Col-0). Plants were cultivated on nutrient agar for 2 weeks with or without Cd. Cadmium was applied as Cd(NO3)2 at two concentrations, 10 and 100 µm. Shoot biomass, root characteristics (primary root length, lateral root number, lateral root length and root hair density) and Cd concentrations in shoots were assessed. Anatomical features (suberization of the endodermis and development of the xylem) that might influence Cd uptake and translocation were also examined. KEY RESULTS Cadmium inhibited plant growth and reduced root length and the number of lateral roots and root hairs per plant. Suberin lamellae in the root endodermis and xylem differentiation developed closer to the root apex in plants exposed to 100 µm Cd. The latter effect was genotype dependent. Shoot Cd accumulation was correlated with root hair abundance when plants were grown in the presence of 10 µm Cd, but not when grown in the presence of 100 µm Cd, in which treatment the development of suberin lamellae closer to the root tip appeared to restrict Cd accumulation in shoots. CONCLUSIONS Root hair density can have a large effect on Cd accumulation in shoots, suggesting that the symplasmic pathway might play a significant role in the uptake and accumulation of this toxic element.
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Affiliation(s)
- Jana Kohanová
- Department of Plant Physiology, Faculty of Natural Sciences, Comenius University in Bratislava, Bratislava, Slovakia
| | - Michal Martinka
- Department of Plant Physiology, Faculty of Natural Sciences, Comenius University in Bratislava, Bratislava, Slovakia
| | - Marek Vaculík
- Department of Plant Physiology, Faculty of Natural Sciences, Comenius University in Bratislava, Bratislava, Slovakia
| | - Philip J White
- The James Hutton Institute, Invergowrie, Dundee, UK
- Distinguished Scientist Fellowship Programme, King Saud University, Riyadh, Kingdom of Saudi Arabia
| | - Marie-Theres Hauser
- Department of Applied Genetics and Cell Biology, University of Natural Resources and Life Sciences, Vienna (BOKU), Vienna, Austria
| | - Alexander Lux
- Department of Plant Physiology, Faculty of Natural Sciences, Comenius University in Bratislava, Bratislava, Slovakia
- Institute of Chemistry, Slovak Academy of Sciences, Bratislava, Slovakia
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Potocka I, Szymanowska-Pułka J. Morphological responses of plant roots to mechanical stress. ANNALS OF BOTANY 2018; 122:711-723. [PMID: 29471488 PMCID: PMC6215033 DOI: 10.1093/aob/mcy010] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2017] [Accepted: 01/15/2018] [Indexed: 05/17/2023]
Abstract
Background Roots are continuously exposed to mechanical pressure and this often results in their morphological modification. Most obvious are changes in the overall form of the root system as well as in the shapes of particular roots. These changes are often accompanied by modifications of the cell pattern and cell morphology. Scope This review focuses on the morphological responses of roots to mechanical stress. Results of early and recent experiments in which roots have been exposed to mechanical pressure are assembled, analysed and discussed. Research applying different experimental sets, obstacles, media of various compactness and structure are reviewed. An effect of the combination of mechanical stresses with other abiotic stresses on roots, and results of estimating the force exerted by the roots are briefly discussed. Possible consequences of the cell pattern rearrangements are considered. Conclusions Several modifications in root morphology are commonly reported: (1) decreased root size, (2) radial swelling accompanied by increased radial dimension of the cortex cell layers and (3) enhanced cap cell sloughing. Nevertheless, because of differences between species and individual plants, a universal scenario for root morphological changes resulting from externally applied pressures is not possible. Thus, knowledge of the root response to mechanical impedance remains incomplete. Studies on the mechanical properties of the root as well as on possible modifications in cell wall structure and composition as the elements responsible for the mechanical properties of the plant tissue are required to understand the response of root tissue as a biomaterial.
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Affiliation(s)
- Izabela Potocka
- Department of Cell Biology, University of Silesia, Katowice, Poland
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Gitto A, Fricke W. Zinc treatment of hydroponically grown barley plants causes a reduction in root and cell hydraulic conductivity and isoform-dependent decrease in aquaporin gene expression. PHYSIOLOGIA PLANTARUM 2018; 164:176-190. [PMID: 29381217 DOI: 10.1111/ppl.12697] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2017] [Revised: 01/19/2018] [Accepted: 01/25/2018] [Indexed: 05/18/2023]
Affiliation(s)
- Aurora Gitto
- School of Biology and Environmental Sciences; University College Dublin; Dublin 4 Republic of Ireland
| | - Wieland Fricke
- School of Biology and Environmental Sciences; University College Dublin; Dublin 4 Republic of Ireland
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Growth is required for perception of water availability to pattern root branches in plants. Proc Natl Acad Sci U S A 2018; 115:E822-E831. [PMID: 29317538 PMCID: PMC5789911 DOI: 10.1073/pnas.1710709115] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
Abstract
Plant roots activate lateral branching in response to contact with available water, but the mechanism by which this environmental signal is perceived is poorly understood. Through a combination of empirical and mathematical-modeling approaches we discovered a central role of tissue growth in this process. Growth causes water uptake, and the biophysical changes that occur during this process are interpreted by the organism to position new lateral branches. This observation is a significant advancement in our understanding of how the environment shapes plant development and demonstrates that perception of water is intimately tied to a core biological function of the root. Water availability is a potent regulator of plant development and induces root branching through a process termed hydropatterning. Hydropatterning enables roots to position lateral branches toward regions of high water availability, such as wet soil or agar media, while preventing their emergence where water is less available, such as in air. The mechanism by which roots perceive the spatial distribution of water during hydropatterning is unknown. Using primary roots of Zea mays (maize) we reveal that developmental competence for hydropatterning is limited to the growth zone of the root tip. Past work has shown that growth generates gradients in water potential across an organ when asymmetries exist in the distribution of available water. Using mathematical modeling, we predict that substantial growth-sustained water potential gradients are also generated in the hydropatterning competent zone and that such biophysical cues inform the patterning of lateral roots. Using diverse chemical and environmental treatments we experimentally demonstrate that growth is necessary for normal hydropatterning of lateral roots. Transcriptomic characterization of the local response of tissues to a moist surface or air revealed extensive regulation of signaling and physiological pathways, some of which we show are growth-dependent. Our work supports a “sense-by-growth” mechanism governing hydropatterning, by which water availability cues are rendered interpretable through growth-sustained water movement.
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Li P, Yang M, Chang J, Wu J, Zhong F, Rahman A, Qin H, Wu S. Spatial Expression and Functional Analysis of Casparian Strip Regulatory Genes in Endodermis Reveals the Conserved Mechanism in Tomato. FRONTIERS IN PLANT SCIENCE 2018; 9:832. [PMID: 29988388 PMCID: PMC6024017 DOI: 10.3389/fpls.2018.00832] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Accepted: 05/29/2018] [Indexed: 05/20/2023]
Abstract
Casparian strip (CS) is an impregnation of endodermal cell wall, forming an apoplastic diffusion barrier which forces the symplastic and selective transport of nutrients across endodermis. This extracellular structure can be found in the roots of all higher plants and is thought to provide the protection of vascular tissues. In Arabidopsis, a genetic toolbox regulating the formation of Casparian strips has emerged recently. However, Arabidopsis has the stereotypical root which is much simpler than most other plant species. To understand the Casparian strip formation in a more complex root system, we examined CS regulatory pathways in tomato. Our results reveal a spatiotemporally conserved expression pattern of most essential components of CS machinery in tomato. Further functional analyses verify the role of homologous CS genes in the Casparian strip formation in tomato, indicating the functional conservation of CS regulatory cascade in tomato.
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Affiliation(s)
- Pengxue Li
- FAFU-UCR Joint Center and Fujian Provincial Key Laboratory of Haixia Applied Plant Systems Biology, College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Meina Yang
- FAFU-UCR Joint Center and Fujian Provincial Key Laboratory of Haixia Applied Plant Systems Biology, College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Jiang Chang
- FAFU-UCR Joint Center and Fujian Provincial Key Laboratory of Haixia Applied Plant Systems Biology, College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Junqing Wu
- FAFU-UCR Joint Center and Fujian Provincial Key Laboratory of Haixia Applied Plant Systems Biology, College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Fenglin Zhong
- FAFU-UCR Joint Center and Fujian Provincial Key Laboratory of Haixia Applied Plant Systems Biology, College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Abidur Rahman
- Department of Plant Bio Sciences, Faculty of Agriculture, Iwate University, Morioka, Japan
| | - Haiyang Qin
- FAFU-UCR Joint Center and Fujian Provincial Key Laboratory of Haixia Applied Plant Systems Biology, College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Shuang Wu
- FAFU-UCR Joint Center and Fujian Provincial Key Laboratory of Haixia Applied Plant Systems Biology, College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou, China
- *Correspondence: Shuang Wu,
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Rossi L, Zhang W, Schwab AP, Ma X. Uptake, Accumulation, and in Planta Distribution of Coexisting Cerium Oxide Nanoparticles and Cadmium in Glycine max (L.) Merr. . ENVIRONMENTAL SCIENCE & TECHNOLOGY 2017; 51:12815-12824. [PMID: 29024588 DOI: 10.1021/acs.est.7b03363] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Agricultural soils are likely to be polluted by both conventional and emerging contaminants at the same time. Understanding the interactions of coexisting engineered nanoparticles (ENPs) and trace elements (a common source of abiotic stress) is critical to gaining insights into the accumulation of these two groups of chemicals by plants. The objectives of this study were to determine the uptake and accumulation of coexisting ENPs and trace elements by soybeans and to gain insights into the physiological mechanisms resulting in different plant accumulation of these materials. The combinations of three cadmium levels (0 [control] and 0.25 and 1 milligrams per kilogram of dry soil) and two CeO2 NPs concentrations (0 [control] and 500 milligrams per kilogram of dry soil) were investigated. Measurements of the plant biomass and physiological parameters indicated that CeO2 NPs led to higher variable fluorescence to maximum fluorescence ratio, suggesting that CeO2 NPs enhanced the plant light energy use efficiency by photosystem II. In addition, the presence of CeO2 NPs did not affect Cd accumulation in soybean, but Cd significantly increased the accumulation of Ce in plant tissues, especially in roots and older leaves. The altered Ce in planta distribution was partially associated with the formation of root apoplastic barriers in the co-presence of Cd and CeO2 NPs.
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Affiliation(s)
- Lorenzo Rossi
- Zachry Department of Civil Engineering, Texas A&M University , TAMU 3136, College Station, Texas 77843-3136, United States
| | - Weilan Zhang
- Zachry Department of Civil Engineering, Texas A&M University , TAMU 3136, College Station, Texas 77843-3136, United States
| | - Arthur P Schwab
- Department of Soil and Crop Sciences, Texas A&M University , TAMU 2474, College Station, Texas 77843-2474, United States
| | - Xingmao Ma
- Zachry Department of Civil Engineering, Texas A&M University , TAMU 3136, College Station, Texas 77843-3136, United States
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Doblas VG, Geldner N, Barberon M. The endodermis, a tightly controlled barrier for nutrients. CURRENT OPINION IN PLANT BIOLOGY 2017; 39:136-143. [PMID: 28750257 DOI: 10.1016/j.pbi.2017.06.010] [Citation(s) in RCA: 85] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Revised: 06/13/2017] [Accepted: 06/14/2017] [Indexed: 05/24/2023]
Abstract
Plant roots acquire nutrients from the soil and transport them upwards to the aerial parts. To reach the central vasculature of the root, water and nutrients radially cross all external cell layers. The endodermis surrounds the vascular tissues and forms diffusion barriers. It thereby compartmentalizes the root and allows control of nutrient transport from the soil to the vasculature, as well as preventing backflow of nutrients from the stele. To achieve this role, endodermal cells undergo two specialized differentiations states consisting of deposition of two impermeable polymers in the cell wall: lignin, forming the Casparian strips, and suberin lamellae. Recent publications showed that endodermal barrier formation is not a hard-wired, irreversible process. Synthesis and degradation of suberin lamellae is highly regulated by plant hormones in response to nutrient stresses. Moreover, Casparian strip continuity seems to be constantly checked by two small peptides produced in the vasculature that diffuse into the apoplastic space in order to test endodermal barrier integrity. This review discusses the recent understanding of endodermal barrier surveillance and plasticity and its role in plant nutrition.
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Affiliation(s)
- Verónica G Doblas
- Department of Plant Molecular Biology, University of Lausanne, 1015 Lausanne, Switzerland
| | - Niko Geldner
- Department of Plant Molecular Biology, University of Lausanne, 1015 Lausanne, Switzerland
| | - Marie Barberon
- Department of Plant Molecular Biology, University of Lausanne, 1015 Lausanne, Switzerland.
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Barberon M. The endodermis as a checkpoint for nutrients. THE NEW PHYTOLOGIST 2017; 213:1604-1610. [PMID: 27551946 DOI: 10.1111/nph.14140] [Citation(s) in RCA: 107] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2016] [Accepted: 06/17/2016] [Indexed: 05/20/2023]
Abstract
Contents 1604 I. 1604 II. 1604 III. 1605 IV. 1608 V. 1609 1609 References 1609 SUMMARY: Plant roots forage the soil for nutrients and transport them upwards to the aerial parts. Nutrients entering the plant are transported through the concentric layers of epidermis, cortex and endodermis before reaching the central vasculature. The endodermis is the innermost cortical cell layer that surrounds the vasculature. The endodermis forms barriers, the Casparian strips and suberin lamellae, which have been assumed to play a major role in controlling nutrient acquisition. However, the molecular network controlling its differentiation has started to be investigated only recently, giving an unprecedented opportunity to address the role of these barriers in plant nutrition. This insight aims to present recent advances regarding endodermis differentiation, its function as a barrier for nutrients and its developmental plasticity, all pointing to a pivotal role of the endodermis as a checkpoint for nutrients.
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Affiliation(s)
- Marie Barberon
- DBMV, UNIL-Sorge, University of Lausanne, 1015, Lausanne, Switzerland
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Ryan PR, Delhaize E, Watt M, Richardson AE. Plant roots: understanding structure and function in an ocean of complexity. ANNALS OF BOTANY 2016; 118:555-559. [PMCID: PMC5055641 DOI: 10.1093/aob/mcw192] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2016] [Revised: 08/06/2016] [Accepted: 08/19/2016] [Indexed: 05/17/2023]
Abstract
Background The structure and function of plant roots and their interactions with soil are exciting scientific frontiers that will ultimately reveal much about our natural systems, global water and mineral and carbon cycles, and help secure food supplies into the future. This Special Issue presents a collection of papers that address topics at the forefront of our understanding of root biology. Scope These papers investigate how roots cope with drought, nutrient deficiencies, toxicities and soil compaction as well as the interactions that roots have with soil microorganisms. Roots of model plant species, annual crops and perennial species are studied in short-term experiments through to multi-year trials. Spatial scales range from the gene up to farming systems and nutrient cycling. The diverse, integrated approaches described by these studies encompass root genetics as applied to soil management, as well as documenting the signalling processes occurring between roots and shoots and between roots and soil. Conclusions This Special Issue on roots presents invited reviews and research papers covering a span of topics ranging from fundamental aspects of anatomy, growth and water uptake to roots in crop and pasture systems. Understanding root structure and function and adaptation to the abiotic and biotic stresses encountered in field conditions is important for sustainable agricultural production and better management of natural systems.
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Affiliation(s)
- Peter R. Ryan
- CSIRO Agriculture and Food, GPO Box 1600, Canberra, ACT 2601, Australia
- *For correspondence. E-mail
| | - Emmanuel Delhaize
- CSIRO Agriculture and Food, GPO Box 1600, Canberra, ACT 2601, Australia
| | - Michelle Watt
- Plant Sciences Institute, Bio and Geo Sciences, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
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De Zio E, Trupiano D, Montagnoli A, Terzaghi M, Chiatante D, Grosso A, Marra M, Scaloni A, Scippa GS. Poplar woody taproot under bending stress: the asymmetric response of the convex and concave sides. ANNALS OF BOTANY 2016; 118:865-883. [PMID: 27558889 PMCID: PMC5055640 DOI: 10.1093/aob/mcw159] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Revised: 07/03/2016] [Accepted: 07/20/2016] [Indexed: 05/09/2023]
Abstract
Background and Aims Progress has been made in understanding the physiological and molecular basis of root response to mechanical stress, especially in the model plant Arabidopsis thaliana, in which bending causes the initiation of lateral root primordia toward the convex side of the bent root. In the case of woody roots, it has been reported that mechanical stress induces an asymmetric distribution of lateral roots and reaction wood formation, but the mechanisms underlying these responses are largely unknown. In the present work, the hypothesis was tested that bending could determine an asymmetric response in the two sides of the main root axis as cells are stretched on the convex side and compressed on the concave side. Methods Woody taproots of 20 seedlings were bent to an angle of 90° using a steel net. Changes in the anatomy, lignin and phytohormone content and proteome expression in the two sides of the bent root were analysed; anatomical changes, including dissimilarities and similarities to those found in poplar bent woody stem, were also considered. Key Results Compression forces at the concave side of poplar root induced the formation of reaction wood which presented a high lignin content and was associated with the induction of cambium cell activity. Auxin seemed to be the main hormone triggering lignin deposition and cell wall strengthening in the concave sides. Abscisic acid appeared to function in the water stress response induced by xylem structures and/or osmotic alterations in the compression sides, whereas gibberellins may control cell elongation and gravitropisms. Conclusions Poplar root reaction wood showed characteristics different from those produced in bent stem. Besides providing biomechanical functions, a bent root ensures water uptake and transport in the deforming condition induced by tension and compression forces by two different strategies: an increase in xylem thickness in the compressed side, and lateral root formation in the tension side.
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Affiliation(s)
- Elena De Zio
- Dipartimento di Bioscienze e Territorio, University of Molise, 86090 Pesche (IS), Italy
| | - Dalila Trupiano
- Dipartimento di Bioscienze e Territorio, University of Molise, 86090 Pesche (IS), Italy
| | - Antonio Montagnoli
- Dipartimento di Biotecnologie e Scienze della Vita, University of Insubria, 21100 Varese, Italy
| | - Mattia Terzaghi
- Dipartimento di Biotecnologie e Scienze della Vita, University of Insubria, 21100 Varese, Italy
| | - Donato Chiatante
- Dipartimento di Biotecnologie e Scienze della Vita, University of Insubria, 21100 Varese, Italy
| | - Alessandro Grosso
- Dipartimento di Biologia, University of Rome ‘Tor Vergata’, 00133 Rome, Italy
| | - Mauro Marra
- Dipartimento di Biologia, University of Rome ‘Tor Vergata’, 00133 Rome, Italy
| | - Andrea Scaloni
- Proteomics and Mass Spectrometry Laboratory, ISPAAM, National Research Council, 80147 Napoli, Italy
| | - Gabriella S. Scippa
- Dipartimento di Bioscienze e Territorio, University of Molise, 86090 Pesche (IS), Italy
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