1
|
Malinowski R, Singh D, Kasprzewska A, Blicharz S, Basińska-Barczak A. Vascular tissue - boon or bane? How pathogens usurp long-distance transport in plants and the defence mechanisms deployed to counteract them. THE NEW PHYTOLOGIST 2024. [PMID: 39101283 DOI: 10.1111/nph.20030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2024] [Accepted: 06/13/2024] [Indexed: 08/06/2024]
Abstract
Evolutionary emergence of specialised vascular tissues has enabled plants to coordinate their growth and adjust to unfavourable external conditions. Whilst holding a pivotal role in long-distance transport, both xylem and phloem can be encroached on by various biotic factors for systemic invasion and hijacking of nutrients. Therefore, a complete understanding of the strategies deployed by plants against such pathogens to restrict their entry and establishment within plant tissues, is of key importance for the future development of disease-tolerant crops. In this review, we aim to describe how microorganisms exploit the plant vascular system as a route for gaining access and control of different host tissues and metabolic pathways. Highlighting several biological examples, we detail the wide range of host responses triggered to prevent or hinder vascular colonisation and effectively minimise damage upon biotic invasions.
Collapse
Affiliation(s)
- Robert Malinowski
- Department of Integrative Plant Biology, Institute of Plant Genetics of the Polish Academy of Sciences, ul. Strzeszynska 34, Poznań, 60-479, Poland
| | - Deeksha Singh
- Department of Integrative Plant Biology, Institute of Plant Genetics of the Polish Academy of Sciences, ul. Strzeszynska 34, Poznań, 60-479, Poland
| | - Anna Kasprzewska
- Regulation of Gene Expression Team, Institute of Plant Genetics of the Polish Academy of Sciences, ul. Strzeszynska 34, Poznań, 60-479, Poland
| | - Sara Blicharz
- Department of Integrative Plant Biology, Institute of Plant Genetics of the Polish Academy of Sciences, ul. Strzeszynska 34, Poznań, 60-479, Poland
| | - Aneta Basińska-Barczak
- Department of Integrative Plant Biology, Institute of Plant Genetics of the Polish Academy of Sciences, ul. Strzeszynska 34, Poznań, 60-479, Poland
| |
Collapse
|
2
|
Markel K, Novak V, Bowen BP, Tian Y, Chen YC, Sirirungruang S, Zhou A, Louie KB, Northen TR, Eudes A, Scheller HV, Shih PM. Cynipid wasps systematically reprogram host metabolism and restructure cell walls in developing galls. PLANT PHYSIOLOGY 2024; 195:698-712. [PMID: 38236304 PMCID: PMC11181936 DOI: 10.1093/plphys/kiae001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Revised: 11/14/2023] [Accepted: 11/14/2023] [Indexed: 01/19/2024]
Abstract
Many insects have evolved the ability to manipulate plant growth to generate extraordinary structures called galls, in which insect larva can develop while being sheltered and feeding on the plant. In particular, cynipid (Hymenoptera: Cynipidae) wasps have evolved to form morphologically complex galls and generate an astonishing array of gall shapes, colors, and sizes. However, the biochemical basis underlying these remarkable cellular and developmental transformations remains poorly understood. A key determinant in plant cellular development is cell wall deposition that dictates the physical form and physiological function of newly developing cells, tissues, and organs. However, it is unclear to what degree cell walls are restructured to initiate and support the formation of new gall tissue. Here, we characterize the molecular alterations underlying gall development using a combination of metabolomic, histological, and biochemical techniques to elucidate how valley oak (Quercus lobata) leaf cells are reprogrammed to form galls. Strikingly, gall development involves an exceptionally coordinated spatial deposition of lignin and xylan to form de novo gall vasculature. Our results highlight how cynipid wasps can radically change the metabolite profile and restructure the cell wall to enable the formation of galls, providing insights into the mechanism of gall induction and the extent to which plants can be entirely reprogrammed to form unique structures and organs.
Collapse
Affiliation(s)
- Kasey Markel
- Department of Plant and Microbial Biology, University of California, Berkeley, Berkeley, CA 94720, USA
- Feedstocks Division, Joint BioEnergy Institute, Emeryville, CA 94608, USA
- Environmental Genomics and Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94608, USA
| | - Vlastimil Novak
- Environmental Genomics and Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94608, USA
| | - Benjamin P Bowen
- Environmental Genomics and Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94608, USA
- Joint Genome Institute, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Yang Tian
- Feedstocks Division, Joint BioEnergy Institute, Emeryville, CA 94608, USA
- Environmental Genomics and Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94608, USA
| | - Yi-Chun Chen
- Feedstocks Division, Joint BioEnergy Institute, Emeryville, CA 94608, USA
- Environmental Genomics and Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94608, USA
| | - Sasilada Sirirungruang
- Department of Plant and Microbial Biology, University of California, Berkeley, Berkeley, CA 94720, USA
- Feedstocks Division, Joint BioEnergy Institute, Emeryville, CA 94608, USA
- Environmental Genomics and Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94608, USA
- Center for Biomolecular Structure, Function and Application, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand
| | - Andy Zhou
- Department of Plant and Microbial Biology, University of California, Berkeley, Berkeley, CA 94720, USA
- Feedstocks Division, Joint BioEnergy Institute, Emeryville, CA 94608, USA
- Environmental Genomics and Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94608, USA
| | - Katherine B Louie
- Environmental Genomics and Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94608, USA
- Joint Genome Institute, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Trent R Northen
- Environmental Genomics and Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94608, USA
- Joint Genome Institute, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Aymerick Eudes
- Feedstocks Division, Joint BioEnergy Institute, Emeryville, CA 94608, USA
- Environmental Genomics and Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94608, USA
| | - Henrik V Scheller
- Department of Plant and Microbial Biology, University of California, Berkeley, Berkeley, CA 94720, USA
- Feedstocks Division, Joint BioEnergy Institute, Emeryville, CA 94608, USA
- Environmental Genomics and Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94608, USA
| | - Patrick M Shih
- Department of Plant and Microbial Biology, University of California, Berkeley, Berkeley, CA 94720, USA
- Feedstocks Division, Joint BioEnergy Institute, Emeryville, CA 94608, USA
- Environmental Genomics and Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94608, USA
- Joint Genome Institute, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
- Innovative Genomics Institute, University of California, Berkeley, CA 94720, USA
| |
Collapse
|
3
|
Lv M, Dai Y, Xie L, Guo J, Liao Z, Shang W, Zhao X, Hong J, Zhang HM. Volume electron microscopy reconstruction uncovers a physical barrier that limits virus to phloem. THE NEW PHYTOLOGIST 2024; 241:343-362. [PMID: 37858933 DOI: 10.1111/nph.19319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2023] [Accepted: 09/20/2023] [Indexed: 10/21/2023]
Abstract
Most plant reoviruses are phloem-limited, but the mechanism has remained unknown for more than half a century. Southern rice black-streaked dwarf virus (Fijivirus, Reoviridae) causes phloem-derived tumors, where its virions, genomes, and proteins accumulate, and it was used as a model to explore how its host plant limits the virus within its phloem. High-throughput volume electron microscopy revealed that only sieve plate pores and flexible gateways rather than plasmodesmata had a sufficiently large size exclusion limit (SEL) to accommodate virions and potentially serve as pathways of virion movement. The large SEL gateways were enriched within the proliferated sieve element (SE) layers of tumors. The lack of such connections out of the SE-enriched regions of tumors defined a size-dependent physical barrier to high flux transportation of virions. A working model is proposed to demonstrate the mechanism underlying limitation of virus within phloem.
Collapse
Affiliation(s)
- Mingfang Lv
- Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
| | - Yuanxing Dai
- Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
- College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua, 321004, China
| | - Li Xie
- Analysis Center of Agrobiology and Environmental Sciences, Zhejiang University, Hangzhou, 310058, China
- College of Agricultural Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Jiansheng Guo
- Department of Biophysics, Zhejiang University School of Medicine and Center of Cryo Electron Microscopy, Zhejiang University, Hangzhou, 310058, China
| | - Zhenfeng Liao
- Public Lab, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
| | - Weina Shang
- Analysis Center of Agrobiology and Environmental Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Xiaohuan Zhao
- Analysis Center of Agrobiology and Environmental Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Jian Hong
- Analysis Center of Agrobiology and Environmental Sciences, Zhejiang University, Hangzhou, 310058, China
- College of Agricultural Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Heng-Mu Zhang
- Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
- College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua, 321004, China
| |
Collapse
|
4
|
Nobrega LP, de Sá Haiad B, Ferreira BG. Epidermal and subepidermal changes during the formation of hairy galls induced by Eriophyidae on Avicennia schaueriana leaves. THE SCIENCE OF NATURE - NATURWISSENSCHAFTEN 2023; 110:49. [PMID: 37737319 DOI: 10.1007/s00114-023-01876-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 09/02/2023] [Accepted: 09/04/2023] [Indexed: 09/23/2023]
Abstract
Leaf-galling Eriophyidae (Acarina) may promote simple or complex alterations in the organs of their host plants, such as an increase in indumentum density or the reorganization of epidermis and ground system tissue patterns. To test if hairy galls of Eriophyidae on Avicennia schaueriana (Acanthaceae) are related to complex changes, leaf galls in distinct developmental phases were compared to non-galled leaves using anatomical, histochemical, and histometric analyses. Quantitative comparisons of preferential gall induction sites and gall area according to distinct leaf portions were made to evaluate if the impacts of gall formation can be related to the distinct potentialities of leaf microsites. The apical portion of the leaves and leaf margins were the sites with the highest occurrence of galls, but no relationship was detected between gall area and induction site. The gall anatomy revealed that epidermal features are influenced the most with the development of abnormal stomata and projected or sunken salt glands. The most striking change is the neoformation of elongated filiform trichomes on the abaxial surface (where the mites occur) that accumulate reducing sugars and proteins. The filiform trichomes may protect the inducers against abiotic stressors and enemies, and the primary metabolites that accumulate are important foods for mites. The mesophyll has simple alterations, only in the spongy parenchyma. Complex alterations occur only in abaxial epidermal cells close to feeding sites of the inducer. The number of inducers per gall seems to be the most important influence on gall size, since gall area is not related to the position in the leaves.
Collapse
Affiliation(s)
- Leticia Ponticel Nobrega
- Departamento de Botânica, Instituto de Biologia, Universidade Federal Do Rio de Janeiro, Rio de Janeiro, RJ, 21941-902, Brazil
- Programa de Pós-Graduação Em Ciências Biológicas (Botânica), Museu Nacional, Universidade Federal Do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Bárbara de Sá Haiad
- Programa de Pós-Graduação Em Ciências Biológicas (Botânica), Museu Nacional, Universidade Federal Do Rio de Janeiro, Rio de Janeiro, Brazil
- Departamento de Botânica, Museu Nacional, Universidade Federal Do Rio de Janeiro, Quinta da Boa Vista, Rio de Janeiro, RJ, Brazil
| | - Bruno Garcia Ferreira
- Departamento de Botânica, Instituto de Biologia, Universidade Federal Do Rio de Janeiro, Rio de Janeiro, RJ, 21941-902, Brazil.
- Programa de Pós-Graduação Em Ciências Biológicas (Botânica), Museu Nacional, Universidade Federal Do Rio de Janeiro, Rio de Janeiro, Brazil.
| |
Collapse
|
5
|
Trivedi DD, Dalai SK, Bakshi SR. The Mystery of Cancer Resistance: A Revelation Within Nature. J Mol Evol 2023; 91:133-155. [PMID: 36693985 DOI: 10.1007/s00239-023-10092-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Accepted: 01/04/2023] [Indexed: 01/25/2023]
Abstract
Cancer, a disease due to uncontrolled cell proliferation is as ancient as multicellular organisms. A 255-million-years-old fossilized forerunner mammal gorgonopsian is probably the oldest evidence of cancer, to date. Cancer seems to have evolved by adapting to the microenvironment occupied by immune sentinel, modulating the cellular behavior from cytotoxic to regulatory, acquiring resistance to chemotherapy and surviving hypoxia. The interaction of genes with environmental carcinogens is central to cancer onset, seen as a spectrum of cancer susceptibility among human population. Cancer occurs in life forms other than human also, although their exposure to environmental carcinogens can be different. Role of genetic etiology in cancer in multiple species can be interesting with regard to not only cancer susceptibility, but also genetic conservation and adaptation in speciation. The widely used model organisms for cancer research are mouse and rat which are short-lived and reproduce rapidly. Research in these cancer prone animal models has been valuable as these have led to cancer therapy. However, another rewarding area of cancer research can be the cancer-resistant animal species. The Peto's paradox and G-value paradox are evident when natural cancer resistance is observed in large mammals, like elephant and whale, small rodents viz. Naked Mole Rat and Blind Mole Rat, and Bat. The cancer resistance remains to be explored in other small or large and long-living animals like giraffe, camel, rhinoceros, water buffalo, Indian bison, Shire horse, polar bear, manatee, elephant seal, walrus, hippopotamus, turtle and tortoise, sloth, and squirrel. Indeed, understanding the molecular mechanisms of avoiding neoplastic transformation across various life forms can be potentially having translational value for human cancer management. Adapted and Modified from (Hanahan and Weinberg 2011).
Collapse
|
6
|
Nobrega LP, de Sá-Haiad B, Ferreira BG. Mechanisms of hydraulic conductivity in the leaf galls of Meunieriella sp. (Cecidomyiidae) in Avicennia schaueriana (Acanthaceae): does vascularization explain the preferred sites of induction? PLANT BIOLOGY (STUTTGART, GERMANY) 2023; 25:198-207. [PMID: 36394440 DOI: 10.1111/plb.13490] [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: 06/23/2022] [Accepted: 11/07/2022] [Indexed: 06/16/2023]
Abstract
Intralaminar galls of Meunieriella result from ground tissue proliferation in leaves of Avicennia schaueriana, a typical halophytic mangrove. We tested if the preferred sites of gall induction were the midribs and secondary veins (SV) at the basal leaf portion, where the galls were expected to be largest; and if the vascular system in galls and adjacent regions was altered to favour water supply in galls, thus increasing their growth. Gall induction sites and gall sizes were quantified according to leaf portions and regions. Anatomical and histometric analyses in vascular and ground tissues of galls and adjacent regions were compared to equivalent regions of non-galled leaves. The galls were largest at basal sites on leaves, the midrib and SV. More galls occurred on the apical portion of the leaf, and on the leaf blade and secondary vein regions. Changes in shape and vascular system area, number and diameter of vessel elements were detected in both galls and adjacent regions. Fewer and smaller-sized vessel elements were observed in regions proximal to the galls and inside them. Gall size is not related with preferred induction sites, which could be explained by factors such as thermal balance. Alterations in the vascular system indicate reduced hydraulic conductivity in the xylem in the proximal region and inside galls, leading to water leakage to gall parenchyma cells. This compensatory mechanism explains the expansion and proliferation of water storage and spongy parenchyma cells in the galls, explaining the higher growth in more vascularized regions.
Collapse
Affiliation(s)
- L P Nobrega
- Departamento de Botânica, Instituto de Biologia, Universidade Federal do Rio de Janeiro, Centro de Ciências da Saúde, Cidade Universitária, Rio de Janeiro, Brazil
- Programa de Pós-Graduação em Ciências Biológicas (Botânica), Museu Nacional, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - B de Sá-Haiad
- Programa de Pós-Graduação em Ciências Biológicas (Botânica), Museu Nacional, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
- Departamento de Botânica, Museu Nacional, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - B G Ferreira
- Departamento de Botânica, Instituto de Biologia, Universidade Federal do Rio de Janeiro, Centro de Ciências da Saúde, Cidade Universitária, Rio de Janeiro, Brazil
- Programa de Pós-Graduação em Ciências Biológicas (Botânica), Museu Nacional, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| |
Collapse
|
7
|
Gorshkov V, Tsers I. Plant susceptible responses: the underestimated side of plant-pathogen interactions. Biol Rev Camb Philos Soc 2021; 97:45-66. [PMID: 34435443 PMCID: PMC9291929 DOI: 10.1111/brv.12789] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Revised: 08/12/2021] [Accepted: 08/13/2021] [Indexed: 12/18/2022]
Abstract
Plant susceptibility to pathogens is usually considered from the perspective of the loss of resistance. However, susceptibility cannot be equated with plant passivity since active host cooperation may be required for the pathogen to propagate and cause disease. This cooperation consists of the induction of reactions called susceptible responses that transform a plant from an autonomous biological unit into a component of a pathosystem. Induced susceptibility is scarcely discussed in the literature (at least compared to induced resistance) although this phenomenon has a fundamental impact on plant-pathogen interactions and disease progression. This review aims to summarize current knowledge on plant susceptible responses and their regulation. We highlight two main categories of susceptible responses according to their consequences and indicate the relevance of susceptible response-related studies to agricultural practice. We hope that this review will generate interest in this underestimated aspect of plant-pathogen interactions.
Collapse
Affiliation(s)
- Vladimir Gorshkov
- Kazan Institute of Biochemistry and Biophysics, Federal Research Center Kazan Scientific Center of Russian Academy of Sciences, Kazan, 420111, Russia.,Laboratory of Plant Infectious Diseases, Federal Research Center Kazan Scientific Center of Russian Academy of Sciences, Kazan, 420111, Russia
| | - Ivan Tsers
- Laboratory of Plant Infectious Diseases, Federal Research Center Kazan Scientific Center of Russian Academy of Sciences, Kazan, 420111, Russia
| |
Collapse
|
8
|
Ten Tusscher K. Of mice and plants: Comparative developmental systems biology. Dev Biol 2020; 460:32-39. [PMID: 30395805 DOI: 10.1016/j.ydbio.2018.10.024] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Revised: 10/31/2018] [Accepted: 10/31/2018] [Indexed: 02/02/2023]
Abstract
Multicellular animals and plants represent independent evolutionary experiments with complex multicellular bodyplans. Differences in their life history, a mobile versus sessile lifestyle, and predominant embryonic versus postembryonic development, have led to the evolution of highly different body plans. However, also many intriguing parallels exist. Extension of the vertebrate body axis and its segmentation into somites bears striking resemblance to plant root growth and the concomittant prepatterning of lateral root competent sites. Likewise, plant shoot phyllotaxis displays similarities with vertebrate limb and digit patterning. Additionally, both plants and animals use complex signalling systems combining systemic and local signals to fine tune and coordinate organ growth across their body. Identification of these striking examples of convergent evolution provides support for the existence of general design principles: the idea that for particular patterning demands, evolution is likely to arrive at highly similar developmental patterning mechanisms. Furthermore, focussing on these parallels may aid in identifying core mechanistic principles, often obscured by the highly complex nature of multiscale patterning processes.
Collapse
Affiliation(s)
- Kirsten Ten Tusscher
- Computational Developmental Biology, Department of Biology, Faculty of Science, Utrecht University, the Netherlands.
| |
Collapse
|
9
|
Dodueva IE, Lebedeva MA, Kuznetsova KA, Gancheva MS, Paponova SS, Lutova LL. Plant tumors: a hundred years of study. PLANTA 2020; 251:82. [PMID: 32189080 DOI: 10.1007/s00425-020-03375-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2019] [Accepted: 03/11/2020] [Indexed: 05/21/2023]
Abstract
The review provides information on the mechanisms underlying the development of spontaneous and pathogen-induced tumors in higher plants. The activation of meristem-specific regulators in plant tumors of various origins suggests the meristem-like nature of abnormal plant hyperplasia. Plant tumor formation has more than a century of research history. The study of this phenomenon has led to a number of important discoveries, including the development of the Agrobacterium-mediated transformation technique and the discovery of horizontal gene transfer from bacteria to plants. There are two main groups of plant tumors: pathogen-induced tumors (e.g., tumors induced by bacteria, viruses, fungi, insects, etc.), and spontaneous ones, which are formed in the absence of any pathogen in plants with certain genotypes (e.g., interspecific hybrids, inbred lines, and mutants). The causes of the transition of plant cells to tumor growth are different from those in animals, and they include the disturbance of phytohormonal balance and the acquisition of meristematic characteristics by differentiated cells. The aim of this review is to discuss the mechanisms underlying the development of most known examples of plant tumors.
Collapse
Affiliation(s)
- Irina E Dodueva
- Department of Genetics and Biotechnology, Saint-Petersburg State University, Saint-Petersburg, Russia.
| | - Maria A Lebedeva
- Department of Genetics and Biotechnology, Saint-Petersburg State University, Saint-Petersburg, Russia
| | - Kseniya A Kuznetsova
- Department of Genetics and Biotechnology, Saint-Petersburg State University, Saint-Petersburg, Russia
| | - Maria S Gancheva
- Department of Genetics and Biotechnology, Saint-Petersburg State University, Saint-Petersburg, Russia
| | - Svetlana S Paponova
- Department of Genetics and Biotechnology, Saint-Petersburg State University, Saint-Petersburg, Russia
| | - Ludmila L Lutova
- Department of Genetics and Biotechnology, Saint-Petersburg State University, Saint-Petersburg, Russia
| |
Collapse
|
10
|
Dolzblasz A, Banasiak A, Vereecke D. Neovascularization during leafy gall formation on Arabidopsis thaliana upon Rhodococcus fascians infection. PLANTA 2018; 247:215-228. [PMID: 28942496 DOI: 10.1007/s00425-017-2778-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Accepted: 07/24/2017] [Indexed: 06/07/2023]
Abstract
Extensive de novo vascularization of leafy galls emerging upon Rhodococcus fascians infection is achieved by fascicular/interfascicular cambium activity and transdifferentiation of parenchyma cells correlated with increased auxin signaling. A leafy gall consisting of fully developed yet growth-inhibited shoots, induced by the actinomycete Rhodococcus fascians, differs in structure compared to the callus-like galls induced by other bacteria. To get insight into the vascular development accompanying the emergence of the leafy gall, the anatomy of infected axillary regions of the inflorescence stem of wild-type Arabidopsis thaliana accession Col-0 plants and the auxin response in pDR5:GUS-tagged plants were followed in time. Based on our observations, three phases can be discerned during vascularization of the symptomatic tissue. First, existing fascicular cambium becomes activated and interfascicular cambium is formed giving rise to secondary vascular elements in a basipetal direction below the infection site in the main stem and in an acropetal direction in the entire side branch. Then, parenchyma cells in the region between both stems transdifferentiate acropetally towards the surface of the developing symptomatic tissue leading to the formation of xylem and vascularize the hyperplasia as they expand. Finally, parenchyma cells in the developing gall also transdifferentiate to vascular elements without any specific direction resulting in excessive vasculature disorderly distributed in the leafy gall. Prior to any apparent anatomical changes, a strong auxin response is mounted, implying that auxin is the signal that controls the vascular differentiation induced by the infection. To conclude, we propose the "sidetracking gall hypothesis" as we discuss the mechanisms driving the formation of superfluous vasculature of the emerging leafy gall.
Collapse
Affiliation(s)
- Alicja Dolzblasz
- Department of Plant Developmental Biology, Faculty of Biological Sciences, Institute of Experimental Biology, University of Wroclaw, Wroclaw, Poland.
| | - Alicja Banasiak
- Department of Plant Developmental Biology, Faculty of Biological Sciences, Institute of Experimental Biology, University of Wroclaw, Wroclaw, Poland
| | - Danny Vereecke
- Department of Applied Biosciences, Ghent University, Ghent, Belgium.
| |
Collapse
|
11
|
Caballo-Ponce E, Murillo J, Martínez-Gil M, Moreno-Pérez A, Pintado A, Ramos C. Knots Untie: Molecular Determinants Involved in Knot Formation Induced by Pseudomonas savastanoi in Woody Hosts. FRONTIERS IN PLANT SCIENCE 2017; 8:1089. [PMID: 28680437 PMCID: PMC5478681 DOI: 10.3389/fpls.2017.01089] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Accepted: 06/06/2017] [Indexed: 05/10/2023]
Abstract
The study of the molecular basis of tree diseases is lately receiving a renewed attention, especially with the emerging perception that pathogens require specific pathogenicity and virulence factors to successfully colonize woody hosts. Pathosystems involving woody plants are notoriously difficult to study, although the use of model bacterial strains together with genetically homogeneous micropropagated plant material is providing a significant impetus to our understanding of the molecular determinants leading to disease. The gammaproteobacterium Pseudomonas savastanoi belongs to the intensively studied Pseudomonas syringae complex, and includes three pathogenic lineages causing tumorous overgrowths (knots) in diverse economically relevant trees and shrubs. As it occurs with many other bacteria, pathogenicity of P. savastanoi is dependent on a type III secretion system, which is accompanied by a core set of at least 20 effector genes shared among strains isolated from olive, oleander, and ash. The induction of knots of wild-type size requires that the pathogen maintains adequate levels of diverse metabolites, including the phytohormones indole-3-acetic acid and cytokinins, as well as cyclic-di-GMP, some of which can also regulate the expression of other pathogenicity and virulence genes and participate in bacterial competitiveness. In a remarkable example of social networking, quorum sensing molecules allow for the communication among P. savastanoi and other members of the knot microbiome, while at the same time are essential for tumor formation. Additionally, a distinguishing feature of bacteria from the P. syringae complex isolated from woody organs is the possession of a 15 kb genomic island (WHOP) carrying four operons and three other genes involved in degradation of phenolic compounds. Two of these operons mediate the catabolism of anthranilate and catechol and, together with another operon, are required for the induction of full-size tumors in woody hosts, but not in non-woody micropropagated plants. The use of transposon mutagenesis also uncovered a treasure trove of additional P. savastanoi genes affecting virulence and participating in diverse bacterial processes. Although there is still much to be learned on what makes a bacterium a successful pathogen of trees, we are already untying the knots.
Collapse
Affiliation(s)
- Eloy Caballo-Ponce
- Área de Genética, Facultad de Ciencias, Instituto de Hortofruticultura Subtropical y Mediterránea ‘La Mayora’, Universidad de Málaga–Consejo Superior de Investigaciones CientíficasMálaga, Spain
| | - Jesús Murillo
- Departamento de Producción Agraria, ETS de Ingenieros Agrónomos, Universidad Pública de NavarraPamplona, Spain
| | - Marta Martínez-Gil
- Área de Genética, Facultad de Ciencias, Instituto de Hortofruticultura Subtropical y Mediterránea ‘La Mayora’, Universidad de Málaga–Consejo Superior de Investigaciones CientíficasMálaga, Spain
| | - Alba Moreno-Pérez
- Área de Genética, Facultad de Ciencias, Instituto de Hortofruticultura Subtropical y Mediterránea ‘La Mayora’, Universidad de Málaga–Consejo Superior de Investigaciones CientíficasMálaga, Spain
| | - Adrián Pintado
- Área de Genética, Facultad de Ciencias, Instituto de Hortofruticultura Subtropical y Mediterránea ‘La Mayora’, Universidad de Málaga–Consejo Superior de Investigaciones CientíficasMálaga, Spain
| | - Cayo Ramos
- Área de Genética, Facultad de Ciencias, Instituto de Hortofruticultura Subtropical y Mediterránea ‘La Mayora’, Universidad de Málaga–Consejo Superior de Investigaciones CientíficasMálaga, Spain
| |
Collapse
|
12
|
A phloem-limited fijivirus induces the formation of neoplastic phloem tissues that house virus multiplication in the host plant. Sci Rep 2016; 6:29848. [PMID: 27432466 PMCID: PMC4949464 DOI: 10.1038/srep29848] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Accepted: 06/24/2016] [Indexed: 11/26/2022] Open
Abstract
A number of phloem-limited viruses induce the development of tumours (enations) in the veins of host plants, but the relevance of tumour induction to the life cycle of those viruses is unclear. In this study, we performed molecular and structural analyses of tumours induced by rice black-streaked dwarf virus (RBSDV, genus Fijivirus) infection in maize plants. The transcript level of the maize cdc2 gene, which regulates the cell cycle, was highly elevated in tumour tissues. Two-dimensional electrophoresis identified 25 cellular proteins with altered accumulation in the tumour tissues. These proteins are involved in various metabolic pathways, including photosynthesis, redox, energy pathways and amino acid synthesis. Histological analysis indicated that the tumours predominantly originated from hyperplastic growth of phloem, but those neoplastic tissues have irregular structures and cell arrangements. Immunodetection assays and electron microscopy observations indicated that in the shoots, RBSDV is confined to phloem and tumour regions and that virus multiplication actively occurs in the tumour tissue, as indicated by the high accumulation of non-structural proteins and formation of viroplasms in the tumour cells. Thus, the induction of tumours by RBSDV infection provides a larger environment that is favourable for virus propagation in the host plant.
Collapse
|
13
|
Zhang Y, Lee CW, Wehner N, Imdahl F, Svetlana V, Weiste C, Dröge-Laser W, Deeken R. Regulation of oncogene expression in T-DNA-transformed host plant cells. PLoS Pathog 2015; 11:e1004620. [PMID: 25615824 PMCID: PMC4304707 DOI: 10.1371/journal.ppat.1004620] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Accepted: 12/10/2014] [Indexed: 01/04/2023] Open
Abstract
Virulent Agrobacterium tumefaciens strains integrate their T-DNA into the plant genome where the encoded agrobacterial oncogenes are expressed and cause crown gall disease. Essential for crown gall development are IaaH (indole-3-acetamide hydrolase), IaaM (tryptophan monooxygenase) and Ipt (isopentenyl transferase), which encode enzymes for the biosynthesis of auxin (IaaH, IaaM) and cytokinin (Ipt). Although these oncogenes are well studied as the tumor-inducing principle, nothing is known about the regulation of oncogene expression in plant cells. Our studies show that the intergenic regions (IGRs) between the coding sequences (CDS) of the three oncogenes function as promoters in plant cells. These promoters possess a eukaryotic sequence organization and cis-regulatory elements for the binding of plant transcription factors. WRKY18, WRKY40, WRKY60 and ARF5 were identified as activators of the Ipt promoter whereas IaaH and IaaM is constitutively expressed and no transcription factor further activates their promoters. Consistent with these results, the wrky triple mutant plants in particular, develops smaller crown galls than wild-type and exhibits a reduced Ipt transcription, despite the presence of an intact ARF5 gene. WRKY40 and WRKY60 gene expression is induced by A. tumefaciens within a few hours whereas the ARF5 gene is transcribed later during crown gall development. The WRKY proteins interact with ARF5 in the plant nucleus, but only WRKY40 together with ARF5 synergistically boosts the activation of the Ipt promoter in an auxin-dependent manner. From our data, we propose that A. tumefaciens initially induces WRKY40 gene expression as a pathogen defense response of the host cell. The WRKY protein is recruited to induce Ipt expression, which initiates cytokinin-dependent host cell division. With increasing auxin levels triggered by ubiquitous expression of IaaH and IaaM, ARF5 is activated and interacts with WRKY40 to potentiate Ipt expression and balance cytokinin and auxin levels for further cell proliferation. Crown gall development requires the expression of agrobacterial genes in the plant host. These genes are transferred by the T-DNA of the plant pathogen Agrobacterium tumefaciens and include the oncogenes IaaH, IaaM and Ipt, which, according to the tumor-inducing principle, are essential for crown gall development. The oncogenes are involved in auxin and cytokinin production. This results, when at appropriate hormone ratios, in enhanced cell proliferation. The T-DNA transformation process and the encoded oncogene enzymes have been intensively studied, but knowledge of oncogene expression in plant cells and the regulatory host factors is missing. We set out to fill this gap, providing evidence that expression of the Ipt gene is host-cell controlled, whereas the IaaH and IaaM genes are ubiquitously expressed at low levels in T-DNA transformed tissue. This is achieved by A. tumefaciens, which first hijacks transcription factors of the plant pathogen response pathway to activate Ipt oncogene expression and initiates cell proliferation. With increasing auxin levels during the infection process, a transcription factor of the auxin-signaling pathway is recruited, potentiating Ipt gene expression. Thus, for crown gall development, two host-signaling pathways are combined through the interaction of transcription factors that adjust the ratio of cytokinin to auxin.
Collapse
Affiliation(s)
- Yi Zhang
- Julius-von-Sachs-Institute, Department of Molecular Plant Physiology and Biophysics, University of Wuerzburg, Wuerzburg, Germany
| | - Chil-Woo Lee
- Leibniz Institute of Plant Biochemistry, Halle /Saale, Germany
| | - Nora Wehner
- Julius-von-Sachs-Institute, Pharmaceutical Biology, University of Wuerzburg, Wuerzburg, Germany
| | - Fabian Imdahl
- Julius-von-Sachs-Institute, Department of Molecular Plant Physiology and Biophysics, University of Wuerzburg, Wuerzburg, Germany
| | - Veselova Svetlana
- Institute of Biochemistry and Genetics, Ufa Scientific Centre of Russian Academy of Sciences, Ufa, Russia
| | - Christoph Weiste
- Julius-von-Sachs-Institute, Pharmaceutical Biology, University of Wuerzburg, Wuerzburg, Germany
| | - Wolfgang Dröge-Laser
- Julius-von-Sachs-Institute, Pharmaceutical Biology, University of Wuerzburg, Wuerzburg, Germany
| | - Rosalia Deeken
- Julius-von-Sachs-Institute, Department of Molecular Plant Physiology and Biophysics, University of Wuerzburg, Wuerzburg, Germany
- * E-mail:
| |
Collapse
|
14
|
Xie L, Lv MF, Zhang HM, Yang J, Li JM, Chen JP. Tumours induced by a plant virus are derived from vascular tissue and have multiple intercellular gateways that facilitate virus movement. JOURNAL OF EXPERIMENTAL BOTANY 2014; 65:4873-4886. [PMID: 24987015 DOI: 10.1093/jxb/eru254] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Structural studies showed that tumours induced by Southern rice black-streaked dwarf virus (SRBSDV; genus Fijivirus, family Reoviridae) were highly organized, modified phloem, composed of sclerenchyma, vessels, hyperplastic phloem parenchyma and sieve elements (SEs). Only parenchyma and SEs were invaded by the virus. There was a special region that consisted exclusively of SEs without the usual companion cells and a new flexible type of intercellular gateway was observed on all SE-SE interfaces in this region. These flexible gateways significantly increased the intercellular contacts and thus enhanced potential symplastic transport in the tumour. Flexible gateways were structurally similar to compressed plasmodesmata but were able to accommodate complete SRBSDV virions (~80 nm diameter). Virions were also found in sieve-pore gateways, providing strong evidence for the movement of a virus with large virions within phloem tissue and suggesting that the unusual neovascularization of plant virus-induced tumours facilitated virus spread. A working model for the spread of tumour-inducing reoviruses in plants is presented.
Collapse
Affiliation(s)
- Li Xie
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control, Key Laboratory of Plant Protection and Biotechnology, Ministry of Agriculture, Zhejiang Provincial Key Laboratory of Plant Virology, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
| | - Ming-Fang Lv
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control, Key Laboratory of Plant Protection and Biotechnology, Ministry of Agriculture, Zhejiang Provincial Key Laboratory of Plant Virology, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
| | - Heng-Mu Zhang
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control, Key Laboratory of Plant Protection and Biotechnology, Ministry of Agriculture, Zhejiang Provincial Key Laboratory of Plant Virology, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
| | - Jian Yang
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control, Key Laboratory of Plant Protection and Biotechnology, Ministry of Agriculture, Zhejiang Provincial Key Laboratory of Plant Virology, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
| | - Jun-Min Li
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control, Key Laboratory of Plant Protection and Biotechnology, Ministry of Agriculture, Zhejiang Provincial Key Laboratory of Plant Virology, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
| | - Jian-Ping Chen
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control, Key Laboratory of Plant Protection and Biotechnology, Ministry of Agriculture, Zhejiang Provincial Key Laboratory of Plant Virology, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
| |
Collapse
|
15
|
Bartlem DG, Jones MGK, Hammes UZ. Vascularization and nutrient delivery at root-knot nematode feeding sites in host roots. JOURNAL OF EXPERIMENTAL BOTANY 2014; 65:1789-98. [PMID: 24336493 DOI: 10.1093/jxb/ert415] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Plants are constantly challenged by pathogens and pests, which can have a profound impact on the yield and quality of produce in agricultural systems. The vascular system of higher plants is critical for growth and for their ability to counteract changing external conditions, serving as a distribution network for water, nutrients, and photosynthates from the source organs to regions where they are in demand. Unfortunately, these features also make it an attractive target for pathogens and pests that demand access to a reliable supply of host resources. The vascular tissue of plants therefore often plays a central role in pathogen and parasite interactions. One of the more striking rearrangements of the host vascular system occurs during root-knot nematode infestation of plant roots. These sedentary endoparasites induce permanent feeding sites that are comprised of 'giant cells' and are subject to extensive changes in vascularization, resulting in the giant cells being encaged within a network of de novo formed xylem and phloem cells. Despite being considered critical to the function of the feeding site, the mechanisms underlying this vascularization have received surprisingly little attention when compared with the amount of research on giant cell development and function. An overview of the current knowledge on vascularization of root-knot nematode feeding sites is provided here and recent advances in our understanding of the transport mechanisms involved in nutrient delivery to these parasite-induced sinks are described.
Collapse
Affiliation(s)
- Derek G Bartlem
- Research Faculty of Agriculture, Hokkaido University, Sapporo 060-8589, Japan
| | | | | |
Collapse
|
16
|
Mestiri I, Norre F, Gallego ME, White CI. Multiple host-cell recombination pathways act in Agrobacterium-mediated transformation of plant cells. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2014; 77:511-20. [PMID: 24299074 DOI: 10.1111/tpj.12398] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2013] [Revised: 11/16/2013] [Accepted: 11/28/2013] [Indexed: 05/11/2023]
Abstract
Using floral-dip, tumorigenesis and root callus transformation assays of both germline and somatic cells, we present here results implicating the four major non-homologous and homologous recombination pathways in Agrobacterium-mediated transformation of Arabidopsis thaliana. All four single mutant lines showed similar mild reductions in transformability, but knocking out three of four pathways severely compromised Agrobacterium-mediated transformation. Although integration of T-DNA into the plant genome is severely compromised in the absence of known DNA double-strand break repair pathways, it does still occur, suggesting the existence of other pathways involved in T-DNA integration. Our results highlight the functional redundancy of the four major plant recombination pathways in transformation, and provide an explanation for the lack of strong effects observed in previous studies on the roles of plant recombination functions in transformation.
Collapse
Affiliation(s)
- Imen Mestiri
- Génétique, Reproduction et Développement, UMR CNRS 6293, Clermont Université, INSERM U1103, UFR Sciences et Technologies, Université Blaise Pascal, 24 avenue des Landais, BP80026, 63171, Aubière Cedex, France
| | | | | | | |
Collapse
|
17
|
Gohlke J, Deeken R. Plant responses to Agrobacterium tumefaciens and crown gall development. FRONTIERS IN PLANT SCIENCE 2014; 5:155. [PMID: 24795740 PMCID: PMC4006022 DOI: 10.3389/fpls.2014.00155] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2014] [Accepted: 04/02/2014] [Indexed: 05/17/2023]
Abstract
Agrobacterium tumefaciens causes crown gall disease on various plant species by introducing its T-DNA into the genome. Therefore, Agrobacterium has been extensively studied both as a pathogen and an important biotechnological tool. The infection process involves the transfer of T-DNA and virulence proteins into the plant cell. At that time the gene expression patterns of host plants differ depending on the Agrobacterium strain, plant species and cell-type used. Later on, integration of the T-DNA into the plant host genome, expression of the encoded oncogenes, and increase in phytohormone levels induce a fundamental reprogramming of the transformed cells. This results in their proliferation and finally formation of plant tumors. The process of reprogramming is accompanied by altered gene expression, morphology and metabolism. In addition to changes in the transcriptome and metabolome, further genome-wide ("omic") approaches have recently deepened our understanding of the genetic and epigenetic basis of crown gall tumor formation. This review summarizes the current knowledge about plant responses in the course of tumor development. Special emphasis is placed on the connection between epigenetic, transcriptomic, metabolomic, and morphological changes in the developing tumor. These changes not only result in abnormally proliferating host cells with a heterotrophic and transport-dependent metabolism, but also cause differentiation and serve as mechanisms to balance pathogen defense and adapt to abiotic stress conditions, thereby allowing the coexistence of the crown gall and host plant.
Collapse
Affiliation(s)
- Jochen Gohlke
- School of Plant Sciences, University of ArizonaTucson, AZ, USA
| | - Rosalia Deeken
- Department of Molecular Plant Physiology and Biophysics, Julius-von-Sachs-Institute, University of WuerzburgWuerzburg, Germany
- *Correspondence: Rosalia Deeken, Department of Molecular Plant Physiology and Biophysics, Julius-von-Sachs-Institute, University of Wuerzburg, Julius-von-Sachs-Platz 2, 97082 Wuerzburg, Germany e-mail:
| |
Collapse
|
18
|
Aloni R. Role of hormones in controlling vascular differentiation and the mechanism of lateral root initiation. PLANTA 2013; 238:819-30. [PMID: 23835810 DOI: 10.1007/s00425-013-1927-8] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2013] [Accepted: 06/28/2013] [Indexed: 05/21/2023]
Abstract
The vascular system in plants is induced and controlled by streams of inductive hormonal signals. Auxin produced in young leaves is the primary controlling signal in vascular differentiation. Its polar and non-polar transport pathways and major controlling mechanisms are clarified. Ethylene produced in differentiating protoxylem vessels is the signal that triggers lateral root initiation, while tumor-induced ethylene is a limiting and controlling factor of crown gall development and its vascular differentiation. Gibberellin produced in mature leaves moves non-polarly and promotes elongation, regulates cambium activity and induces long fibers. Cytokinin from the root cap moves upward to promote cambial activity and stimulate shoot growth and branching, while strigolactone from the root inhibits branching. Furthermore, the role of the hormonal signals in controlling the type of differentiating vascular elements and gradients of conduit size and density, and how they regulate plant adaptation and have shaped wood evolution are elucidated.
Collapse
Affiliation(s)
- Roni Aloni
- Department of Molecular Biology and Ecology of Plants, Tel Aviv University, 69978, Tel Aviv, Israel,
| |
Collapse
|
19
|
Lang J, Planamente S, Mondy S, Dessaux Y, Moréra S, Faure D. Concerted transfer of the virulence Ti plasmid and companion At plasmid in the Agrobacterium tumefaciens-induced plant tumour. Mol Microbiol 2013; 90:1178-89. [PMID: 24118167 DOI: 10.1111/mmi.12423] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/01/2013] [Indexed: 01/28/2023]
Abstract
The plant pathogen Agrobacterium tumefaciens C58 harbours three independent type IV secretion (T4SS) machineries. T4SST-DNA promotes the transfer of the T-DNA to host plant cells, provoking tumour development and accumulation of opines such as nopaline and agrocinopines. T4SSpTi and T4SSpAt control the bacterial conjugation of the Ti and At plasmids respectively. Expression of T4SSpTi is controlled by the agrocinopine-responsive transcriptional repressor AccR. In this work, we compared the genome-wide transcriptional profile of the wild-type A. tumefaciens strain C58 with that of its accR KO-mutant to delineate the AccR regulon. In addition to the genes that encode agrocinopine catabolism and T4SSpTi , we found that AccR also regulated genes coding for nopaline catabolism and T4SSpAt . Further opine detection and conjugation assays confirmed the enhancement of nopaline consumption and At plasmid conjugation frequency in accR. Moreover, co-regulation of the T4SSpTi and T4SSpAt correlated with the co-transfer of the At and Ti plasmids both in vitro and in plant tumours. Finally, unlike T4SSpTi , T4SSpAt activation does not require quorum-sensing. Overall this study highlights the regulatory interplays between opines, At and Ti plasmids that contribute to a concerted dissemination of the two replicons in bacterial populations colonizing the plant tumour.
Collapse
Affiliation(s)
- Julien Lang
- Centre National de la Recherche Scientifique, Institut des Sciences du Végétal, UPR2355, 1, Avenue de la Terrasse, 91198, Gif-sur-Yvette, France
| | | | | | | | | | | |
Collapse
|
20
|
Sawchuk MG, Scarpella E. Polarity, continuity, and alignment in plant vascular strands. JOURNAL OF INTEGRATIVE PLANT BIOLOGY 2013; 55:824-834. [PMID: 23773763 DOI: 10.1111/jipb.12086] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2013] [Accepted: 06/04/2013] [Indexed: 06/02/2023]
Abstract
Plant vascular cells are joined end to end along uninterrupted lines to connect shoot organs with roots; vascular strands are thus polar, continuous, and internally aligned. What controls the formation of vascular strands with these properties? The "auxin canalization hypothesis"-based on positive feedback between auxin flow through a cell and the cell's capacity for auxin transport-predicts the selection of continuous files of cells that transport auxin polarly, thus accounting for the polarity and continuity of vascular strands. By contrast, polar, continuous auxin transport-though required-is insufficient to promote internal alignment of vascular strands, implicating additional factors. The auxin canalization hypothesis was derived from the response of mature tissue to auxin application but is consistent with molecular and cellular events in embryo axis formation and shoot organ development. Objections to the hypothesis have been raised based on vascular organizations in callus tissue and shoot organs but seem unsupported by available evidence. Other objections call instead for further research; yet the inductive and orienting influence of auxin on continuous vascular differentiation remains unique.
Collapse
Affiliation(s)
- Megan G Sawchuk
- Department of Biological Sciences, University of Alberta, Edmonton Alberta, Canada, T6G 2E9
| | | |
Collapse
|
21
|
Gohlke J, Scholz CJ, Kneitz S, Weber D, Fuchs J, Hedrich R, Deeken R. DNA methylation mediated control of gene expression is critical for development of crown gall tumors. PLoS Genet 2013; 9:e1003267. [PMID: 23408907 PMCID: PMC3567176 DOI: 10.1371/journal.pgen.1003267] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2012] [Accepted: 12/04/2012] [Indexed: 11/19/2022] Open
Abstract
Crown gall tumors develop after integration of the T-DNA of virulent Agrobacterium tumefaciens strains into the plant genome. Expression of the T-DNA-encoded oncogenes triggers proliferation and differentiation of transformed plant cells. Crown gall development is known to be accompanied by global changes in transcription, metabolite levels, and physiological processes. High levels of abscisic acid (ABA) in crown galls regulate expression of drought stress responsive genes and mediate drought stress acclimation, which is essential for wild-type-like tumor growth. An impact of epigenetic processes such as DNA methylation on crown gall development has been suggested; however, it has not yet been investigated comprehensively. In this study, the methylation pattern of Arabidopsis thaliana crown galls was analyzed on a genome-wide scale as well as at the single gene level. Bisulfite sequencing analysis revealed that the oncogenes Ipt, IaaH, and IaaM were unmethylated in crown galls. Nevertheless, the oncogenes were susceptible to siRNA-mediated methylation, which inhibited their expression and subsequently crown gall growth. Genome arrays, hybridized with methylated DNA obtained by immunoprecipitation, revealed a globally hypermethylated crown gall genome, while promoters were rather hypomethylated. Mutants with reduced non-CG methylation developed larger tumors than the wild-type controls, indicating that hypermethylation inhibits plant tumor growth. The differential methylation pattern of crown galls and the stem tissue from which they originate correlated with transcriptional changes. Genes known to be transcriptionally inhibited by ABA and methylated in crown galls became promoter methylated upon treatment of A. thaliana with ABA. This suggests that the high ABA levels in crown galls may mediate DNA methylation and regulate expression of genes involved in drought stress protection. In summary, our studies provide evidence that epigenetic processes regulate gene expression, physiological processes, and the development of crown gall tumors.
Collapse
Affiliation(s)
- Jochen Gohlke
- Julius-von-Sachs-Institute, Department of Molecular Plant Physiology and Biophysics, University of Wuerzburg, Wuerzburg, Germany
| | - Claus-Juergen Scholz
- IZKF Laboratory for Microarray Applications, University Hospital of Wuerzburg, Wuerzburg, Germany
| | - Susanne Kneitz
- Physiological Chemistry I, Biocenter, University of Wuerzburg, Wuerzburg, Germany
| | - Dana Weber
- Julius-von-Sachs-Institute, Department of Molecular Plant Physiology and Biophysics, University of Wuerzburg, Wuerzburg, Germany
| | - Joerg Fuchs
- Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Gatersleben, Germany
| | - Rainer Hedrich
- Julius-von-Sachs-Institute, Department of Molecular Plant Physiology and Biophysics, University of Wuerzburg, Wuerzburg, Germany
| | - Rosalia Deeken
- Julius-von-Sachs-Institute, Department of Molecular Plant Physiology and Biophysics, University of Wuerzburg, Wuerzburg, Germany
- * E-mail:
| |
Collapse
|
22
|
|
23
|
Abstract
Several observations have led us to a new hypothesis for cancer mechanism. First, that cancer appears only on those multicellular organisms with complicated wound-healing capacities. Second, that wounds considered as risk factors can be identified in all cancers in clinics. And finally, that oncogene activation appears not only in cancer, but also in normal physiology and noncancer pathology processes. Our proposed hypothesis is that cancer is a natural wound healing-related process, which includes oncogene activations, cytokine secretions, stem cell recruitment differentiation, and tissue remodeling. Wounds activate oncogenes of some cells and the latter secrete cytokines to recruit stem cells to heal the wounds. However, if the cause of the wound or if the wound persists, such as under the persistent UV and carcinogen exposures, the continuous wound healing process will lead to a clinical cancer mass. There is no system in nature to stop or reverse the wound healing process in the middle stage when the wound exists. The outcome of the cancer mechanism is either healing the wound or exhausting the whole system (death). The logic of this cancer mechanism is consistent with the rationales of the other physiological metabolisms in the body-for survival. This hypothesis helps to understand many cancer mysteries derived from the mutation theory, such as why cancer only exists in a small proportion of multicellular organisms, although they are all under potential mutation risks during DNA replications. The hypothesis can be used to interpret and guide cancer prevention, recurrence, metastasis, in vitro and in vivo studies, and personalized treatments.
Collapse
Affiliation(s)
- Xiaolong Meng
- Breast Medical Oncology Department, MD Anderson Cancer Center, 1155 Hermann Pressler Dr., Houston, TX 77030 USA
| | - Jie Zhong
- Neurosurgery Department, MD Anderson Cancer Center, 1400 Holcombe Blvd., Houston, TX 77030 USA
| | - Shuying Liu
- Breast Medical Oncology Department, MD Anderson Cancer Center, 1155 Hermann Pressler Dr., Houston, TX 77030 USA
| | - Mollianne Murray
- Systems Biology Department, MD Anderson Cancer Center, 7435 Fannin St., Houston, TX 77054 USA
| | - Ana M. Gonzalez-Angulo
- Breast Medical Oncology Department, MD Anderson Cancer Center, 1155 Hermann Pressler Dr., Houston, TX 77030 USA
| |
Collapse
|
24
|
Abstract
In plants, as in animals, most cells that constitute the organism limit their reproductive potential in order to provide collective support for the immortal germ line. And, as in animals, the mechanisms that restrict the proliferation of somatic cells in plants can fail, leading to tumours. There are intriguing similarities in tumorigenesis between plants and animals, including the involvement of the retinoblastoma pathway as well as overlap with mechanisms that are used for stem cell maintenance. However, plant tumours are less frequent and are not as lethal as those in animals. We argue that fundamental differences between plant and animal development make it much more difficult for individual plant cells to escape communal controls.
Collapse
Affiliation(s)
- John H Doonan
- John Innes Centre, Conley Lane, Norwich NR4 7UH, UK.
| | | |
Collapse
|
25
|
Loivamäki M, Stührwohldt N, Deeken R, Steffens B, Roitsch T, Hedrich R, Sauter M. A role for PSK signaling in wounding and microbial interactions in Arabidopsis. PHYSIOLOGIA PLANTARUM 2010; 139:348-357. [PMID: 20403122 DOI: 10.1111/j.1399-3054.2010.01371.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
PSK-alpha is a disulfated peptide that acts as a growth factor in plants. PSK-alpha is derived from preproproteins which are encoded by five PSK precursor genes in Arabidopsis thaliana (L.) Heynh and is perceived by leucine-rich repeat receptor kinases. Arabidopsis has two PSK receptor genes, PSKR1 and PSKR2. Although ligand and receptor are well characterized, the biological functions of PSK signaling are not well understood. Using reporter lines and receptor knockout mutants of Arabidopsis, a role for PSK signaling in biotic interactions and in wounding was analyzed. Treatment of Arabidopsis leaves with the fungal elicitor E-Fol, or the fungal pathogens Alternaria brassicicola and Sclerotinia sclerotiorum resulted in induction of PSK2 and PSKR1 as shown by promoter:GUS analysis. Wounding of hypocotyls or leaves induced PSK3:GUS, PSK5:GUS and PSKR1:GUS expression indicating that PSK precursor genes are differentially regulated in response to specific stresses. The receptor knockout lines pskr1-3 and pskr2-1 showed significantly reduced photosynthesis in response to the fungal elicitor E-Fol which indicates that fungal defence is impaired. pskr1-3 plants further showed reduced growth of crown galls after infection with Agrobacterium tumefaciens. A role for PSK signaling in Agrobacterium tumefaciens tumor growth was supported by the finding that PSK precursor genes and PSKR1 are expressed in crown galls. Overall, the results indicate that PSK signaling may play a previously undescribed role in pathogen or herbivore interactions and is crucial for Agrobacterium-induced cell proliferation in crown gall formation.
Collapse
Affiliation(s)
- Maaria Loivamäki
- Pharmaceutical Biology, Julius-von-Sachs-Institute for Biosciences, University of Würzburg, 97082 Würzburg, Germany
| | | | | | | | | | | | | |
Collapse
|
26
|
Lee CW, Efetova M, Engelmann JC, Kramell R, Wasternack C, Ludwig-Müller J, Hedrich R, Deeken R. Agrobacterium tumefaciens promotes tumor induction by modulating pathogen defense in Arabidopsis thaliana. THE PLANT CELL 2009; 21:2948-62. [PMID: 19794116 PMCID: PMC2768927 DOI: 10.1105/tpc.108.064576] [Citation(s) in RCA: 98] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2008] [Revised: 09/02/2009] [Accepted: 09/10/2009] [Indexed: 05/18/2023]
Abstract
Agrobacterium tumefaciens causes crown gall disease by transferring and integrating bacterial DNA (T-DNA) into the plant genome. To examine the physiological changes and adaptations during Agrobacterium-induced tumor development, we compared the profiles of salicylic acid (SA), ethylene (ET), jasmonic acid (JA), and auxin (indole-3-acetic acid [IAA]) with changes in the Arabidopsis thaliana transcriptome. Our data indicate that host responses were much stronger toward the oncogenic strain C58 than to the disarmed strain GV3101 and that auxin acts as a key modulator of the Arabidopsis-Agrobacterium interaction. At initiation of infection, elevated levels of IAA and ET were associated with the induction of host genes involved in IAA, but not ET signaling. After T-DNA integration, SA as well as IAA and ET accumulated, but JA did not. This did not correlate with SA-controlled pathogenesis-related gene expression in the host, although high SA levels in mutant plants prevented tumor development, while low levels promoted it. Our data are consistent with a scenario in which ET and later on SA control virulence of agrobacteria, whereas ET and auxin stimulate neovascularization during tumor formation. We suggest that crosstalk among IAA, ET, and SA balances pathogen defense launched by the host and tumor growth initiated by agrobacteria.
Collapse
Affiliation(s)
- Chil-Woo Lee
- Julius-von-Sachs-Institute, Department of Molecular Plant Physiology and Biophysics, University of Wuerzburg, D-97082 Wuerzburg, Germany
| | - Marina Efetova
- Julius-von-Sachs-Institute, Department of Molecular Plant Physiology and Biophysics, University of Wuerzburg, D-97082 Wuerzburg, Germany
| | - Julia C Engelmann
- Theodor-Boveri-Institute, Department of Bioinformatics, University of Wuerzburg, D-97074 Wuerzburg, Germany
| | - Robert Kramell
- Department of Natural Product Biotechnology, Leibniz Institute of Plant Biochemistry, D-06120 Halle (Saale), Germany
| | - Claus Wasternack
- Department of Natural Product Biotechnology, Leibniz Institute of Plant Biochemistry, D-06120 Halle (Saale), Germany
| | - Jutta Ludwig-Müller
- Institute of Botany, Dresden University of Technology, D-01062 Dresden, Germany
| | - Rainer Hedrich
- Julius-von-Sachs-Institute, Department of Molecular Plant Physiology and Biophysics, University of Wuerzburg, D-97082 Wuerzburg, Germany
| | - Rosalia Deeken
- Julius-von-Sachs-Institute, Department of Molecular Plant Physiology and Biophysics, University of Wuerzburg, D-97082 Wuerzburg, Germany
- Address correspondence to
| |
Collapse
|
27
|
Rodríguez-Moreno L, Jiménez AJ, Ramos C. Endopathogenic lifestyle of Pseudomonas savastanoi pv. savastanoi in olive knots. Microb Biotechnol 2009; 2:476-88. [PMID: 21255279 PMCID: PMC3815908 DOI: 10.1111/j.1751-7915.2009.00101.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
The endophytic phase of Pseudomonas savastanoi pv. savastanoi in olive stems and the structural and ultrastructural histogenesis of olive knots have been studied. Construction of a stable plasmid vector expressing the green fluorescent protein, in combination with the use of in vitro olive plants, allowed real‐time monitoring of P. savastanoi pv. savastanoi infection. The infection process was also examined by bright field and epifluorescence microscopy as well as by scanning and transmission electron microscopy. Hypertrophy of the stem tissue was concomitant with the formation of bacterial aggregates, microcolonies and multilayer biofilms, over the cell surfaces and the interior of plasmolysed cells facing the air‐tissue interface of internal opened fissures, and was followed by invasion of the outer layers of the hypertrophied tissue. Pathogenic invasion of the internal lumen of newly formed xylem vessels, which were connected with the stem vascular system, was also observed in late stages of infection. Ultrastructural analysis of knot sections showed the release of outer membrane vesicles from the pathogen surface, a phenomenon not described before for bacterial phytopathogens during host infection. This is the first real‐time monitoring of P. savastanoi disease development and the first illustrated description of the ultrastructure of P. savastanoi‐induced knots.
Collapse
Affiliation(s)
- Luis Rodríguez-Moreno
- Departamento de Biología Celular, Genética y Fisiología, Universidad de Málaga, Campus de Teatinos s/n, E-29071, Málaga, Spain
| | | | | |
Collapse
|
28
|
Abstract
Sedentary nematodes are destructive plant pathogens that cause significant yield losses. In the roots of their host plants, cyst nematodes (CNs) and root-knot nematodes (RKNs) induce different, highly specialized feeding sites--syncytia or giant cells (GCs), respectively--to optimize nutrient uptake. We compared the mechanisms by which nutrients are delivered from the model host plant, Arabidopsis, to GCs induced by the RKN Meloidogyne incognita or to syncytia induced by the CN Heterodera schachtii. From previous work, syncytia were known to be symplastically connected to newly formed host phloem composed of sieve elements (SEs) and companion cells. Here we studied the formation of plasmodesmata (PD) during GC and syncytia development by monitoring a viral movement protein that targets branched PD and the development of host phloem during GC formation by applying confocal laser scanning microscopy and immunocytochemistry. Analyses of plants expressing soluble or membrane-anchored green fluorescent protein in their phloem demonstrated symplastic isolation of GCs. GCs were found to be embedded in a tissue that consists exclusively of SEs. These de novo-formed SEs, contained nuclei and were interconnected by secondary PD. A similar interconnection of SEs was observed around syncytia. However, these secondary PD were also present at the SE-syncytium interface, demonstrating the postulated symplastic connection. Our results show that CNs and RKNs, despite their close phylogenetic relatedness, employ fundamentally different strategies to withdraw nutrients from host plants.
Collapse
|
29
|
Efetova M, Zeier J, Riederer M, Lee CW, Stingl N, Mueller M, Hartung W, Hedrich R, Deeken R. A central role of abscisic acid in drought stress protection of Agrobacterium-induced tumors on Arabidopsis. PLANT PHYSIOLOGY 2007; 145:853-62. [PMID: 17827272 PMCID: PMC2048785 DOI: 10.1104/pp.107.104851] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2007] [Accepted: 08/09/2007] [Indexed: 05/17/2023]
Abstract
Crown gall tumors induced by Agrobacterium tumefaciens represent a sink that has to be provided with nutrients and water by the host plant. The lack of an intact epidermis or cuticle results in uncontrolled loss of water. However, neither the tumor nor the host plant displays wilting. This phenomenon points to drought adaptation in both tumors and the crown gall host plant. To understand the underlying molecular mechanisms of protection against desiccation the gene expression pattern of Arabidopsis (Arabidopsis thaliana) tumors was integrated with the profile of stress metabolites: Arabidopsis tumors accumulated high amounts of abscisic acid (ABA), the ethylene precursor aminocyclopropyl carboxylic acid, osmoprotectants, and form a suberized periderm-like protective layer. Suberization of the outer tumor cell layers most likely is mediated by ABA since external application of ABA induced suberization of Arabidopsis roots. However, the expression level of the classical marker genes, known to respond to drought stress and/or ABA, was lower in tumors. Instead another set of drought and/or ABA-inducible genes was more highly transcribed. Elevated transcription of several ABA-dependent aquaporin genes might indicate that ABA controls the water balance of the tumor. The retarded tumor growth on abi and aba mutant plants underlined the importance of a tumor-specific ABA signaling pathway. Taken together, we propose that ABA is an important signal for protection of tumors against desiccation and thus supports tumor development.
Collapse
Affiliation(s)
- Marina Efetova
- Department of Molecular Plant Physiology and Biophysics , Biocenter, Julius-von-Sachs-Institute, University of Wuerzburg, D-97082 Wuerzburg, Germany
| | | | | | | | | | | | | | | | | |
Collapse
|
30
|
Ruggiero RA, Bustuoabad OD. The biological sense of cancer: a hypothesis. Theor Biol Med Model 2006; 3:43. [PMID: 17173673 PMCID: PMC1764731 DOI: 10.1186/1742-4682-3-43] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2006] [Accepted: 12/15/2006] [Indexed: 12/26/2022] Open
Abstract
BACKGROUND Most theories about cancer proposed during the last century share a common denominator: cancer is believed to be a biological nonsense for the organism in which it originates, since cancer cells are believed to be ones evading the rules that control normal cell proliferation and differentiation. In this essay, we have challenged this interpretation on the basis that, throughout the animal kingdom, cancer seems to arise only in injured organs and tissues that display lost or diminished regenerative ability. HYPOTHESIS According to our hypothesis, a tumor cell would be the only one able to respond to the demand to proliferate in the organ of origin. It would be surrounded by "normal" aged cells that cannot respond to that signal. According to this interpretation, cancer would have a profound biological sense: it would be the ultimate way to attempt to restore organ functions and structures that have been lost or altered by aging or noxious environmental agents. In this way, the features commonly associated with tumor cells could be reinterpreted as progressively acquired adaptations for responding to a permanent regenerative signal in the context of tissue injury. Analogously, several embryo developmental stages could be dependent on cellular damage and death, which together disrupt the field topography. However, unlike normal structures, cancer would have no physiological value, because the usually poor or non-functional nature of its cells would make their reparative task unattainable. CONCLUSION The hypothesis advanced in this essay might have significant practical implications. All conventional therapies against cancer attempt to kill all cancer cells. However, according to our hypothesis, the problem might not be solved even if all the tumor cells were eradicated. In effect, if the organ failure remained, new tumor cells would emerge and the tumor would reinitiate its progressive growth in response to the permanent regenerative signal of the non-restored organ. Therefore, efficient anti-cancer therapy should combine an attack against the tumor cells themselves with the correction of the organ failure, which, according to this hypothesis, is fundamental to the origin of the cancer.
Collapse
Affiliation(s)
- Raúl A Ruggiero
- División Medicina Experimental, Instituto de Investigaciones Hematológicas, Academia Nacional de Medicina de Buenos Aires, Pacheco de Melo 3081, 1425 Buenos Aires, Argentina
| | - Oscar D Bustuoabad
- División Medicina Experimental, Instituto de Investigaciones Hematológicas, Academia Nacional de Medicina de Buenos Aires, Pacheco de Melo 3081, 1425 Buenos Aires, Argentina
| |
Collapse
|
31
|
Deeken R, Engelmann JC, Efetova M, Czirjak T, Müller T, Kaiser WM, Tietz O, Krischke M, Mueller MJ, Palme K, Dandekar T, Hedrich R. An integrated view of gene expression and solute profiles of Arabidopsis tumors: a genome-wide approach. THE PLANT CELL 2006; 18:3617-34. [PMID: 17172353 PMCID: PMC1785400 DOI: 10.1105/tpc.106.044743] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Transformation of plant cells with T-DNA of virulent agrobacteria is one of the most extreme triggers of developmental changes in higher plants. For rapid growth and development of resulting tumors, specific changes in the gene expression profile and metabolic adaptations are required. Increased transport and metabolic fluxes are critical preconditions for growth and tumor development. A functional genomics approach, using the Affymetrix whole genome microarray (approximately 22,800 genes), was applied to measure changes in gene expression. The solute pattern of Arabidopsis thaliana tumors and uninfected plant tissues was compared with the respective gene expression profile. Increased levels of anions, sugars, and amino acids were correlated with changes in the gene expression of specific enzymes and solute transporters. The expression profile of genes pivotal for energy metabolism, such as those involved in photosynthesis, mitochondrial electron transport, and fermentation, suggested that tumors produce C and N compounds heterotrophically and gain energy mainly anaerobically. Thus, understanding of gene-to-metabolite networks in plant tumors promotes the identification of mechanisms that control tumor development.
Collapse
Affiliation(s)
- Rosalia Deeken
- Julius-von-Sachs-Institute, Department of Molecular Plant Physiology and Biophysics, University of Wuerzburg, D-97082 Wuerzburg, Germany
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
32
|
Balen B, Krsnik-Rasol M, Zamfir AD, Milosević J, Vakhrushev SY, Peter-Katalinić J. Glycoproteomic survey of Mammillaria gracillis tissues grown in vitro. J Proteome Res 2006; 5:1658-66. [PMID: 16823973 DOI: 10.1021/pr0600327] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The structure elucidation of protein-linked N-glycans in plants has raised interest in the past years due to remarkable physiological roles attributed to these modifications. However, little information about the glycoprotein patterns related to plant cell differentiation, dedifferentiation and transformation is available. In this work, the use of two-dimensional polyacrylamide gel electrophoresis in conjunction with matrix assisted laser/desorption ionization (MALDI) time-of-flight (TOF) mass spectrometry (MS) for the characterization of carbohydrates released from plant glycoproteins is described. Proteins from different Mammillaria tissues (shoot, callus, hyperhydric regenerant, and TW tumor) were separated by 2D SDS-polyacrylamide gel electrophoresis, transferred to a nitrocellulose membrane and incubated with Con A to detect N-glycosylated proteins. To discover if the same protein can have various N-glycan structures depending on the organization status of the tissue, the selected glycoprotein spot, which was common for all investigated tissues, was excised from the gels and digested by PNGase A. The released oligosaccharides were analyzed by MALDI-TOF-MS. The results obtained in this study indicate that the N-glycosylation pattern of the protein is clearly dependent on level of plant tissue organization and can be related to the specific morphogenic status.
Collapse
Affiliation(s)
- Biljana Balen
- Department of Molecular Biology, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia.
| | | | | | | | | | | |
Collapse
|
33
|
Chalupowicz L, Barash I, Schwartz M, Aloni R, Manulis S. Comparative anatomy of gall development on Gypsophila paniculata induced by bacteria with different mechanisms of pathogenicity. PLANTA 2006; 224:429-37. [PMID: 16477460 DOI: 10.1007/s00425-006-0229-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2005] [Accepted: 01/13/2006] [Indexed: 05/06/2023]
Abstract
Galls induced on Gypsophila paniculata by Pantoea agglomerans pv. gypsophilae (Pag) and Agrobacterium tumefaciens (At), bacteria with different mechanisms of pathogenicity, were compared morphologically and anatomically. The pathogenicity of Pag is dependent on the presence of an indigenous plasmid that harbors hrp gene cluster, genes encoding Hop virulence proteins and biosynthetic genes for auxin (IAA) and cytokinins (CKs), whereas that of At involves host transformation. The Pag-induced gall was rough, brittle and exhibited limited growth, in contrast to the smooth, firm appearance and continuous growth of the At-induced gall. Anatomical analysis revealed the presence of cells with enlarged nuclei and multiple nucleoli, giant cells and suberin deposition in Pag that were absent from At-induced galls. Although circular vessels were observed in both gall types, they were more numerous and the vascular system was more organized in At. An aerenchymal tissue was observed in the upper part of the galls. Ethylene emission from Pag galls, recorded 6 days after inoculation, was eight times as great as that from non-infected controls. In contrast, a significant decrease in ethylene production was observed in Gypsophila cuttings infected with Pag mutants deficient in IAA and CK production. The results presented are best accounted for by the two pathogens having distinct pathogenicity mechanisms that lead to their differential recognition by the host as non-self (Pag) and self (At).
Collapse
Affiliation(s)
- L Chalupowicz
- Department of Plant Pathology and Weed Research, ARO, Volcani Center, 50250, Bet Dagan, Israel
| | | | | | | | | |
Collapse
|
34
|
Hoth S, Schneidereit A, Lauterbach C, Scholz-Starke J, Sauer N. Nematode infection triggers the de novo formation of unloading phloem that allows macromolecular trafficking of green fluorescent protein into syncytia. PLANT PHYSIOLOGY 2005; 138:383-92. [PMID: 15849304 PMCID: PMC1104191 DOI: 10.1104/pp.104.058800] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2004] [Revised: 02/11/2005] [Accepted: 02/11/2005] [Indexed: 05/18/2023]
Abstract
Syncytial feeding complexes induced by the cyst nematode Heterodera schachtii represent strong metabolic sinks for photoassimilates. These newly formed structures were described to be symplastically isolated from the surrounding root tissue and their mechanism of carbohydrate import has repeatedly been under investigation. Here, we present analyses of the symplastic connectivity between the root phloem and these syncytia in nematode-infected Arabidopsis (Arabidopsis thaliana) plants expressing the gene of the green fluorescent protein (GFP) or of different GFP fusions under the control of the companion cell (CC)-specific AtSUC2 promoter. In the same plants, phloem differentiation during syncytium formation was monitored using cell-specific antibodies for CCs or sieve elements (SEs). Our results demonstrate that free, CC-derived GFP moved freely from the phloem into the syncytial domain. No or only marginal cell-to-cell passage of GFP was observed into other root cells adjacent to these syncytia. In contrast, membrane-anchored GFP variants as well as soluble GFP fusions with increased molecular masses were restricted to the SE-CC complex. The presented data also show that nematode infection triggers the de novo formation of phloem containing an approximately 3-fold excess of SEs over CCs. This newly formed phloem exhibits typical properties of unloading phloem previously described in other sink tissues. Our results reveal the existence of a symplastic pathway between phloem CCs and nematode-induced syncytia. The plasmodesmata responsible for this symplastic connectivity allow the cell-to-cell movement of macromolecules up to 30 kD and are likely to represent the major or exclusive path for the supply of assimilates from the phloem into the syncytial complex.
Collapse
Affiliation(s)
- Stefan Hoth
- Molekulare Pflanzenphysiologie, Friedrich-Alexander-Universität Erlangen-Nürnberg, D-91058 Erlangen, Germany
| | | | | | | | | |
Collapse
|
35
|
Robinson DH. Pleomorphic mammalian tumor-derived bacteria self-organize as multicellular mammalian eukaryotic-like organisms: morphogenetic properties in vitro, possible origins, and possible roles in mammalian `tumor ecologies'. Med Hypotheses 2005; 64:177-85. [PMID: 15533638 DOI: 10.1016/j.mehy.2004.04.023] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2004] [Accepted: 04/26/2004] [Indexed: 11/17/2022]
Abstract
Highly pleomorphic bacteria have regularly been isolated from mammalian tumors and leukemic bloods. Here, it is shown that highly pleomorphic, cell-wall deficient bacteria derived from a mammalian tumor self-organize in vitro into mammalian tissue-like morphogenetic patterns consisting of multicellular tissue-like sheets and capillary-like networks. It is proposed that these pleomorphic mammalian tumor-derived (MTD) bacteria, during morphogenesis, express mammalian tissue morphogenesis-related genes that were acquired through eukaryote-to-prokaryote DNA transfer. Similar pleomorphic MTD bacteria might play important roles as symbiotic multicellular mammalian eukaryotic-like organisms in mammalian 'tumor ecologies' that include malignant and nonmalignant mammalian eukaryotic cells. From a mammalian tumor ecology perspective, eradication of tumors in some mammalian hosts may depend upon the elimination of pleomorphic MTD bacteria self-organized as symbiotic multicellular mammalian eukaryotic-like organisms. Further investigations of the extraordinary mammalian eukaryotic-like multicellularity of these bacteria may yield fundamental insights into the evolution of multicellularity and multicellular development and may challenge basic assumptions regarding cellular evolution.
Collapse
Affiliation(s)
- Douglas H Robinson
- deNovo Biologic LLC, 5528 North 24th Street, Arlington, VA 22205-3113, USA.
| |
Collapse
|
36
|
Kato H, Yamada T. Characterization of a wound-inducible cytochrome P450 gene ( CYP72A29) that is down-regulated during crown gall tumorigenesis in potato tuber. Mol Genet Genomics 2003; 270:139-46. [PMID: 12920577 DOI: 10.1007/s00438-003-0906-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2003] [Accepted: 07/18/2003] [Indexed: 11/30/2022]
Abstract
A cDNA for a putative cytochrome P450 (CYP72A29), which is down-regulated during Agrobacterium tumefaciens -mediated tumorigenesis, was isolated from potato ( Solanum tuberosumL. May Queen) tuber by differential display. Northern analysis indicated that the CYP72A29 gene was transiently up-regulated in tuber discs after a 24-h aging period, and expression gradually increased upon further incubation (up to 7 days). Inoculation of tuber discs with the non-pathogenic A. tumefaciens strain LBA4301 had a very similar effect, but inoculation with the wild-type strain A. tumefaciens A208 suppressed the accumulation of mRNA during further incubation. Furthermore, the accumulation of CYP72A29 mRNA was strongly suppressed by inoculation with mutant strains of A. tumefaciens that produce large amounts of indole-3-acetic acid. This down-regulation also occurred when the discs were treated with 2,4-dichlorophenoxyacetic acid or 1-naphthalenacetic acid. These results suggest that the expression of CYP72A29 is regulated by auxin. RT-PCR analysis revealed that the transcripts were most abundant in sprouts and eyes, less so in roots, and hardly detectable in leaves, flower buds and stems.
Collapse
Affiliation(s)
- H Kato
- Department of Bioscience, Faculty of Biotechnology, Fukui Prefectural University, 4-1-1, Matsuoka-cho, Yoshida-gun, 910-1195, Fukui, Japan.
| | | |
Collapse
|
37
|
Deeken R, Ivashikina N, Czirjak T, Philippar K, Becker D, Ache P, Hedrich R. Tumour development in Arabidopsis thaliana involves the Shaker-like K+ channels AKT1 and AKT2/3. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2003; 34:778-787. [PMID: 12795698 DOI: 10.1046/j.1365-313x.2003.01766.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
After completion of the Arabidopsis genome-sequencing programme, crown galls induced by Agrobacterium tumefaciens may become a model system to study plant tumour development. The molecular mechanisms of nutrient supply to support tumour growth and development are still unknown. In this study, we have identified a unique profile of Shaker-like potassium channels in agrobacteria-induced Arabidopsis tumours. Comparing the gene expression pattern of rapidly growing tumours with that of non-infected tissues, we found the suppression of shoot in favour of root-specific K+ channels. Among these, the upregulation of AKT1 and AtKC1 and the suppression of AKT2/3 and GORK were most pronounced. As a consequence, K+ uptake and accumulation were elevated in the tumour (163 mm) compared to control tissues (92 mm). Patch clamp studies on tumour protoplasts identified a population expressing the electrical properties of the AKT1 K+ channel. Furthermore, plants lacking a functional AKT1 or the AKT2/3 phloem K+ channel gene did not support tumour growth. This indicates that the delivery of potassium by AKT1 and the direction of assimilates, triggered by AKT2/3, are essential for tumour growth.
Collapse
Affiliation(s)
- Rosalia Deeken
- Julius-von-Sachs-Institut für Molekulare Pflanzenphysiologie und Biophysik, Universität Würzburg, Julius-von-Sachs-Platz 2, D-97082 Würzburg, Germany
| | | | | | | | | | | | | |
Collapse
|
38
|
Kempf VAJ, Hitziger N, Riess T, Autenrieth IB. Do plant and human pathogens have a common pathogenicity strategy? Trends Microbiol 2002; 10:269-75. [PMID: 12088662 DOI: 10.1016/s0966-842x(02)02372-7] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Recently, a novel 'two-step' model of pathogenicity has been described that suggests host-cell-derived vasculoproliferative factors play a crucial role in the pathogenesis of bacillary angiomatosis, a disease caused by the human pathogenic bacterium Bartonella henselae. The resulting proliferation of endothelial cells could be interpreted as bacterial pathogens triggering the promotion of their own habitat: the host cell. Similar disease mechanisms are well known in the plant pathogen Agrobacterium tumefaciens, which causes crown gall disease. There are notable similarities between the pathogenicity of A. tumefaciens leading to tumourous disease in plants and to the B. henselae-triggered proliferation of endothelial cells in humans. Here, we hypothesize that this pathogenicity strategy might be common to several bacterial species in different hosts owing to shared pathogenicity factors.
Collapse
Affiliation(s)
- Volkhard A J Kempf
- Institut für Medizinische Mikrobiologie, Eberhard-Karls-Universität, Tübingen, Germany.
| | | | | | | |
Collapse
|