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Otulak-Kozieł K, Kozieł E, Treder K, Rusin P. Homogalacturonan Pectins Tuned as an Effect of Susceptible rbohD, Col-0-Reactions, and Resistance rbohF-, rbohD/F-Reactions to TuMV. Int J Mol Sci 2024; 25:5256. [PMID: 38791293 PMCID: PMC11120978 DOI: 10.3390/ijms25105256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2024] [Revised: 05/02/2024] [Accepted: 05/09/2024] [Indexed: 05/26/2024] Open
Abstract
The plant cell wall is an actively reorganized network during plant growth and triggered immunity in response to biotic stress. While the molecular mechanisms managing perception, recognition, and signal transduction in response to pathogens are well studied in the context of damaging intruders, the current understanding of plant cell wall rebuilding and active defense strategies in response to plant virus infections remains poorly characterized. Pectins can act as major elements of the primary cell wall and are dynamic compounds in response to pathogens. Homogalacturonans (HGs), a main component of pectins, have been postulated as defensive molecules in plant-pathogen interactions and linked to resistance responses. This research focused on examining the regulation of selected pectin metabolism components in susceptible (rbohD-, Col-0-TuMV) and resistance (rbohF-, rbohD/F-TuMV) reactions. Regardless of the interaction type, ultrastructural results indicated dynamic cell wall rebuilding. In the susceptible reaction promoted by RbohF, there was upregulation of AtPME3 (pectin methylesterase) but not AtPME17, confirmed by induction of PME3 protein deposition. Moreover, the highest PME activity along with a decrease in cell wall methylesters compared to resistance interactions in rbohD-TuMV were noticed. Consequently, the susceptible reaction of rbohD and Col-0 to TuMV was characterized by a significant domination of low/non-methylesterificated HGs. In contrast, cell wall changes during the resistance response of rbohF and rbohD/F to TuMV were associated with dynamic induction of AtPMEI2, AtPMEI3, AtGAUT1, and AtGAUT7 genes, confirmed by significant induction of PMEI2, PMEI3, and GAUT1 protein deposition. In both resistance reactions, a dynamic decrease in PME activity was documented, which was most intense in rbohD/F-TuMV. This decrease was accompanied by an increase in cell wall methylesters, indicating that the domination of highly methylesterificated HGs was associated with cell wall rebuilding in rbohF and rbohD/F defense responses to TuMV. These findings suggest that selected PME with PMEI enzymes have a diverse impact on the demethylesterification of HGs and metabolism as a result of rboh-TuMV interactions, and are important factors in regulating cell wall changes depending on the type of interaction, especially in resistance responses. Therefore, PMEI2 and PMEI3 could potentially be important signaling resistance factors in the rboh-TuMV pathosystem.
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Affiliation(s)
- Katarzyna Otulak-Kozieł
- Department of Botany, Institute of Biology, Warsaw University of Life Sciences—SGGW, Nowoursynowska Street 159, 02-776 Warsaw, Poland
| | - Edmund Kozieł
- Department of Botany, Institute of Biology, Warsaw University of Life Sciences—SGGW, Nowoursynowska Street 159, 02-776 Warsaw, Poland
- Plant Breeding and Acclimatization Institute—National Research Institute in Radzików, Bonin Division, Department of Potato Protection and Seed Science at Bonin, Bonin Str. 3, 76-009 Bonin, Poland;
| | - Krzysztof Treder
- Plant Breeding and Acclimatization Institute—National Research Institute in Radzików, Bonin Division, Department of Potato Protection and Seed Science at Bonin, Bonin Str. 3, 76-009 Bonin, Poland;
| | - Piotr Rusin
- Department of Botany, Institute of Biology, Warsaw University of Life Sciences—SGGW, Nowoursynowska Street 159, 02-776 Warsaw, Poland
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Jiang H, Zhou C, Ma J, Qu S, Liu F, Sun H, Zhao X, Han Y. Weighted gene co-expression network analysis identifies genes related to HG Type 0 resistance and verification of hub gene GmHg1. FRONTIERS IN PLANT SCIENCE 2023; 13:1118503. [PMID: 36777536 PMCID: PMC9911859 DOI: 10.3389/fpls.2022.1118503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Accepted: 12/28/2022] [Indexed: 06/18/2023]
Abstract
INTRODUCTION The soybean cyst nematode (SCN) is a major disease in soybean production thatseriously affects soybean yield. At present, there are no studies on weighted geneco-expression network analysis (WGCNA) related to SCN resistance. METHODS Here, transcriptome data from 36 soybean roots under SCN HG Type 0 (race 3) stresswere used in WGCNA to identify significant modules. RESULTS AND DISCUSSION A total of 10,000 differentially expressed genes and 21 modules were identified, of which the module most related to SCN was turquoise. In addition, the hub gene GmHg1 with high connectivity was selected, and its function was verified. GmHg1 encodes serine/threonine protein kinase (PK), and the expression of GmHg1 in SCN-resistant cultivars ('Dongnong L-204') and SCN-susceptible cultivars ('Heinong 37') increased significantly after HG Type 0 stress. Soybean plants transformed with GmHg1-OX had significantly increased SCN resistance. In contrast, the GmHg1-RNAi transgenic soybean plants significantly reduced SCN resistance. In transgenic materials, the expression patterns of 11 genes with the same expression trend as the GmHg1 gene in the 'turquoise module' were analyzed. Analysis showed that 11genes were co-expressed with GmHg1, which may be involved in the process of soybean resistance to SCN. Our work provides a new direction for studying the Molecular mechanism of soybean resistance to SCN.
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Affiliation(s)
- Haipeng Jiang
- Key Laboratory of Soybean Biology in Chinese Ministry of Education (Key Laboratory of Soybean Biology and Breeding/Genetics of Chinese Agriculture Ministry), Northeast Agricultural University, Harbin, China
| | - Changjun Zhou
- Soybean Molecular Breeding Faculty Daqing Branch, Heilongjiang Academy of Agricultrual Science, Daqing, China
| | - Jinglin Ma
- Key Laboratory of Soybean Biology in Chinese Ministry of Education (Key Laboratory of Soybean Biology and Breeding/Genetics of Chinese Agriculture Ministry), Northeast Agricultural University, Harbin, China
| | - Shuo Qu
- Key Laboratory of Soybean Biology in Chinese Ministry of Education (Key Laboratory of Soybean Biology and Breeding/Genetics of Chinese Agriculture Ministry), Northeast Agricultural University, Harbin, China
| | - Fang Liu
- Key Laboratory of Soybean Biology in Chinese Ministry of Education (Key Laboratory of Soybean Biology and Breeding/Genetics of Chinese Agriculture Ministry), Northeast Agricultural University, Harbin, China
| | - Haowen Sun
- Key Laboratory of Soybean Biology in Chinese Ministry of Education (Key Laboratory of Soybean Biology and Breeding/Genetics of Chinese Agriculture Ministry), Northeast Agricultural University, Harbin, China
| | - Xue Zhao
- Key Laboratory of Soybean Biology in Chinese Ministry of Education (Key Laboratory of Soybean Biology and Breeding/Genetics of Chinese Agriculture Ministry), Northeast Agricultural University, Harbin, China
| | - Yingpeng Han
- Key Laboratory of Soybean Biology in Chinese Ministry of Education (Key Laboratory of Soybean Biology and Breeding/Genetics of Chinese Agriculture Ministry), Northeast Agricultural University, Harbin, China
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Fan H, Dong H, Xu C, Liu J, Hu B, Ye J, Mai G, Li H. Pectin methylesterases contribute the pathogenic differences between races 1 and 4 of Fusarium oxysporum f. sp. cubense. Sci Rep 2017; 7:13140. [PMID: 29030626 PMCID: PMC5640671 DOI: 10.1038/s41598-017-13625-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Accepted: 09/27/2017] [Indexed: 02/08/2023] Open
Abstract
Plant cell walls, which are mainly composed of pectin, play important roles in plant defence responses to pathogens. Pectin is synthesised in a highly esterified form and then de-esterified by pectin methylesterases (PMEs). Because of this, PMEs are directly involved in plant defence. However, the molecular mechanisms of their interactions with pectins remain unclear. In this study, we compared the expression level and enzyme activities of PMEs in a banana Cavendish cultivar (Musa AAA 'Brazilian') inoculated with Fusarium oxysporum f. sp. cubense pathogenic races 1 (Foc1) and 4 (Foc4). We further examined the spatial distribution of PMEs and five individual homogalacturonans (HGs) with different degree of pectin methylesterification (DM). Results suggested that the banana roots infected with Foc1 showed lower PME activity than those infected with Foc4, which was consisted with observed higher level of pectin DM. The level of HGs crosslinked with Ca2+ was significantly higher in roots infected with Foc1 compared with those infected with Foc4. Therefore, banana exhibited significantly different responses to Foc1 and Foc4 infection, and these results suggest differences in PME activities, DM of pectin and Ca2+-bridged HG production. These differences could have resulted in observed differences in virulence between Foc1 and Foc4.
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Affiliation(s)
- Huiyun Fan
- State Key Laboratory of Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, College of Agriculture, South China Agricultural University, Guangzhou, 510642, China
| | - Honghong Dong
- State Key Laboratory of Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, College of Agriculture, South China Agricultural University, Guangzhou, 510642, China
| | - Chunxiang Xu
- College of Horticulture, South China Agricultural University, Guangzhou, 510642, China
| | - Jing Liu
- College of Horticulture, South China Agricultural University, Guangzhou, 510642, China
| | - Bei Hu
- College of Horticulture, South China Agricultural University, Guangzhou, 510642, China
| | - Jingwen Ye
- State Key Laboratory of Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, College of Agriculture, South China Agricultural University, Guangzhou, 510642, China
| | - Guiwan Mai
- State Key Laboratory of Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, College of Agriculture, South China Agricultural University, Guangzhou, 510642, China
| | - Huaping Li
- State Key Laboratory of Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, College of Agriculture, South China Agricultural University, Guangzhou, 510642, China.
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Justavino DR, Velásquez JC, Morales Sánchez CO, Rincón R, Oberwinkler F, Bauer R. The interaction apparatus of Asteridiella callista (Meliolaceae, Ascomycota). Mycologia 2017. [DOI: 10.3852/13-146] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Délfida Rodríguez Justavino
- Universität Tübingen, Institut für Evolution und Ökologie, Evolutionäre Ökologie der Pflanzen, Auf der Morgenstelle 1, 72076 Tübingen, Germany Universidad Autónoma de Chiriquí, El Cabrero, Chiriquí, Panamá
| | | | | | - Rafael Rincón
- Universidad Autónoma de Chiriquí, El Cabrero, Chiriquí, Panamá
| | | | - Robert Bauer
- Universität Tübingen, Institut für Evolution und Ökologie, Evolutionäre Ökologie der Pflanzen, Auf der Morgenstelle 1, 72076 Tübingen, Germany
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Oberwinkler F. Dr. Robert Bauer (1950-2014) in memoriam: botanist, mycologist, and electron microscopist. Mycol Prog 2015. [DOI: 10.1007/s11557-015-1120-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Yan Y, Takáč T, Li X, Chen H, Wang Y, Xu E, Xie L, Su Z, Šamaj J, Xu C. Variable content and distribution of arabinogalactan proteins in banana (Musa spp.) under low temperature stress. FRONTIERS IN PLANT SCIENCE 2015; 6:353. [PMID: 26074928 PMCID: PMC4444754 DOI: 10.3389/fpls.2015.00353] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2014] [Accepted: 05/04/2015] [Indexed: 05/25/2023]
Abstract
Information on the spatial distribution of arabinogalactan proteins (AGPs) in plant organs and tissues during plant reactions to low temperature (LT) is limited. In this study, the extracellular distribution of AGPs in banana leaves and roots, and their changes under LT stress were investigated in two genotypes differing in chilling tolerance, by immuno-techniques using 17 monoclonal antibodies against different AGP epitopes. Changes in total classical AGPs in banana leaves were also tested. The results showed that AGP epitopes recognized by JIM4, JIM14, JIM16, and CCRC-M32 antibodies were primarily distributed in leaf veins, while those recognized by JIM8, JIM13, JIM15, and PN16.4B4 antibodies exhibited predominant sclerenchymal localization. Epitopes recognized by LM2, LM14, and MAC207 antibodies were distributed in both epidermal and mesophyll cells. Both genotypes accumulated classical AGPs in leaves under LT treatment, and the chilling tolerant genotype contained higher classical AGPs at each temperature treatment. The abundance of JIM4 and JIM16 epitopes in the chilling-sensitive genotype decreased slightly after LT treatment, and this trend was opposite for the tolerant one. LT induced accumulation of LM2- and LM14-immunoreactive AGPs in the tolerant genotype compared to the sensitive one, especially in phloem and mesophyll cells. These epitopes thus might play important roles in banana LT tolerance. Different AGP components also showed differential distribution patterns in banana roots. In general, banana roots started to accumulate AGPs under LT treatment earlier than leaves. The levels of AGPs recognized by MAC207 and JIM13 antibodies in the control roots of the tolerant genotype were higher than in the chilling sensitive one. Furthermore, the chilling tolerant genotype showed high immuno-reactivity against JIM13 antibody. These results indicate that several AGPs are likely involved in banana tolerance to chilling injury.
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Affiliation(s)
- Yonglian Yan
- Department of Pomology, College of Horticulture, South China Agricultural UniversityGuangzhou, China
| | - Tomáš Takáč
- Department of Cell Biology, Faculty of Science, Centre of the Region Haná for Biotechnological and Agricultural Research, Palacký UniversityOlomouc, Czech Republic
| | - Xiaoquan Li
- Department of Healthy Seeds, Institute of Biotechnology, Guangxi Academy of Agricultural SciencesNanning, China
| | - Houbin Chen
- Department of Pomology, College of Horticulture, South China Agricultural UniversityGuangzhou, China
| | - Yingying Wang
- Department of Pomology, College of Horticulture, South China Agricultural UniversityGuangzhou, China
| | - Enfeng Xu
- Department of Pomology, College of Horticulture, South China Agricultural UniversityGuangzhou, China
| | - Ling Xie
- Department of Pomology, College of Horticulture, South China Agricultural UniversityGuangzhou, China
| | - Zhaohua Su
- Department of Pomology, College of Horticulture, South China Agricultural UniversityGuangzhou, China
| | - Jozef Šamaj
- Department of Cell Biology, Faculty of Science, Centre of the Region Haná for Biotechnological and Agricultural Research, Palacký UniversityOlomouc, Czech Republic
| | - Chunxiang Xu
- Department of Pomology, College of Horticulture, South China Agricultural UniversityGuangzhou, China
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Prabhu SA, Wagenknecht M, Melvin P, Gnanesh Kumar BS, Veena M, Shailasree S, Moerschbacher BM, Kini KR. Immuno-affinity purification of PglPGIP1, a polygalacturonase-inhibitor protein from pearl millet: studies on its inhibition of fungal polygalacturonases and role in resistance against the downy mildew pathogen. Mol Biol Rep 2015; 42:1123-38. [PMID: 25596722 DOI: 10.1007/s11033-015-3850-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2014] [Accepted: 01/09/2015] [Indexed: 11/30/2022]
Abstract
Polygalacturonase-inhibitor proteins (PGIPs) are important plant defense proteins which modulate the activity of microbial polygalacturonases (PGs) leading to elicitor accumulation. Very few studies have been carried out towards understanding the role of PGIPs in monocot host defense. Hence, present study was taken up to characterize a native PGIP from pearl millet and understand its role in resistance against downy mildew. A native glycosylated PGIP (PglPGIP1) of ~43 kDa and pI 5.9 was immunopurified from pearl millet. Comparative inhibition studies involving PglPGIP1 and its non-glycosylated form (rPglPGIP1; recombinant pearl millet PGIP produced in Escherichia coli) against two PGs, PG-II isoform from Aspergillus niger (AnPGII) and PG-III isoform from Fusarium moniliforme, showed both PGIPs to inhibit only AnPGII. The protein glycosylation was found to impact only the pH and temperature stability of PGIP, with the native form showing relatively higher stability to pH and temperature changes. Temporal accumulation of both PglPGIP1 protein (western blot and ELISA) and transcripts (real time PCR) in resistant and susceptible pearl millet cultivars showed significant Sclerospora graminicola-induced accumulation only in the incompatible interaction. Further, confocal PGIP immunolocalization results showed a very intense immuno-decoration with highest fluorescent intensities observed at the outer epidermal layer and vascular bundles in resistant cultivar only. This is the first native PGIP isolated from millets and the results indicate a role for PglPGIP1 in host defense. This could further be exploited in devising pearl millet cultivars with better pathogen resistance.
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Affiliation(s)
- Sreedhara Ashok Prabhu
- Department of Studies in Biotechnology, University of Mysore, Manasagangotri, Mysore, 570 006, Karnataka, India
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Ma L, Jiang S, Lin G, Cai J, Ye X, Chen H, Li M, Li H, Takáč T, Šamaj J, Xu C. Wound-induced pectin methylesterases enhance banana (Musa spp. AAA) susceptibility to Fusarium oxysporum f. sp. cubense. JOURNAL OF EXPERIMENTAL BOTANY 2013; 64:2219-29. [PMID: 23580752 PMCID: PMC3654420 DOI: 10.1093/jxb/ert088] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Recent studies suggest that plant pectin methylesterases (PMEs) are directly involved in plant defence besides their roles in plant development. However, the molecular mechanisms of PME action on pectins are not well understood. In order to understand how PMEs modify pectins during banana (Musa spp.)-Fusarium interaction, the expression and enzyme activities of PMEs in two banana cultivars, highly resistant or susceptible to Fusarium, were compared with each other. Furthermore, the spatial distribution of PMEs and their effect on pectin methylesterification of 10 individual homogalacturonan (HG) epitopes with different degrees of methylesterification (DMs) were also examined. The results showed that, before pathogen treatment, the resistant cultivar displayed higher PME activity than the susceptible cultivar, corresponding well to the lower level of pectin DM. A significant increase in PME expression and activity and a decrease in pectin DM were observed in the susceptible cultivar but not in the resistant cultivar when plants were wounded, which was necessary for successful infection. With the increase of PME in the wounded susceptible cultivar, the JIM5 antigen (low methyestrified HGs) increased. Forty-eight hours after pathogen infection, the PME activity and expression in the susceptible cultivar were higher than those in the resistant cultivar, while the DM was lower. In conclusion, the resistant and the susceptible cultivars differ significantly in their response to wounding. Increased PMEs and thereafter decreased DMs acompanied by increased low methylesterified HGs in the root vascular cylinder appear to play a key role in determination of banana susceptibility to Fusarium.
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Affiliation(s)
- Li Ma
- College of Horticulture, South China Agricultural University, Guangzhou 510642, China
| | - Shuang Jiang
- College of Horticulture, South China Agricultural University, Guangzhou 510642, China
| | - Guimei Lin
- Institute of Biotechnology, Guangxi Academy of Agricultural Sciences, Nanning 530007, China
| | - Jianghua Cai
- College of Horticulture, South China Agricultural University, Guangzhou 510642, China
| | - Xiaoxi Ye
- College of Horticulture, South China Agricultural University, Guangzhou 510642, China
| | - Houbin Chen
- College of Horticulture, South China Agricultural University, Guangzhou 510642, China
| | - Minhui Li
- College of Natural Resources & Environment, South China Agricultural University, Guangzhou 510642, China
| | - Huaping Li
- College of Natural Resources & Environment, South China Agricultural University, Guangzhou 510642, China
| | - Tomáš Takáč
- Centre of the Region Haná for Biotechnological and Agricultural Research, Department of Cell Biology, Faculty of Science, Palacký University, 783 01 Olomouc, Czech Republic
| | - Jozef Šamaj
- Centre of the Region Haná for Biotechnological and Agricultural Research, Department of Cell Biology, Faculty of Science, Palacký University, 783 01 Olomouc, Czech Republic
| | - Chunxiang Xu
- College of Horticulture, South China Agricultural University, Guangzhou 510642, China
- *To whom correspondence should be addressed. E-mail:
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Yi M, Valent B. Communication between filamentous pathogens and plants at the biotrophic interface. ANNUAL REVIEW OF PHYTOPATHOLOGY 2013; 51:587-611. [PMID: 23750888 DOI: 10.1146/annurev-phyto-081211-172916] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Fungi and oomycetes that colonize living plant tissue form extensive interfaces with plant cells in which the cytoplasm of the microorganism is closely aligned with the host cytoplasm for an extended distance. In all cases, specialized biotrophic hyphae function to hijack host cellular processes across an interfacial zone consisting of a hyphal plasma membrane, a specialized interfacial matrix, and a plant-derived membrane. The interface is the site of active secretion by both players. This cross talk at the interface determines the winner in adversarial relationships and establishes the partnership in mutualistic relationships. Fungi and oomycetes secrete many specialized effector proteins for controlling the host, and they can stimulate remarkable cellular reorganization even in distant plant cells. Breakthroughs in live-cell imaging of fungal and oomycete encounter sites, including live-cell imaging of pathogens secreting fluorescently labeled effector proteins, have led to recent progress in understanding communication across the interface.
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Affiliation(s)
- Mihwa Yi
- Department of Plant Pathology, Kansas State University, Manhattan, Kansas 66506-5502, USA.
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Xie D, Ma L, Samaj J, Xu C. Immunohistochemical analysis of cell wall hydroxyproline-rich glycoproteins in the roots of resistant and susceptible wax gourd cultivars in response to Fusarium oxysporum f. sp. Benincasae infection and fusaric acid treatment. PLANT CELL REPORTS 2011; 30:1555-69. [PMID: 21505833 DOI: 10.1007/s00299-011-1069-z] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2011] [Revised: 03/21/2011] [Accepted: 03/28/2011] [Indexed: 05/21/2023]
Abstract
Hydroxyproline-rich glycoproteins (HRGPs) play a defensive role in host-pathogen interactions. However, specific roles of individual HRGPs in plant defense against pathogen are poorly understood. Changes in extracellular distribution and abundance of individual cell wall HRGPs were investigated on root sections of two wax gourd (Benincasa hispida Cogn.) cultivars (Fusarium wilt resistant and susceptible, respectively), which were analyzed by immunolabelling with 20 monoclonal antibodies recognizing different epitopes of extensins and arabinogalactan proteins (AGPs) after being inoculated with Fusarium oxysporum f. sp. Benincasae or treated with fusaric acid (FA). These analyses revealed the following: (1) The levels of JIM11 and JIM20 interacting extensins were higher in the resistant cultivar. Either treatment caused a dramatic decrease in signal in both cultivars, but some new signal appeared in the rhizodermis. (2) The AGPs or rhamnogalacturonan containing CCRCM7-epitope were enhanced in the resistant cultivar, but not in the susceptible one by either treatment. (3) Either treatment caused a slight increase in the levels of the AGPs recognized by LM2 and JIM16, but there were no differences between two cultivars. (4) The MAC204 signal nearly disappeared after FA treatment, but this was not the case with pathogen attack. (5) The LM14 signal slightly decreased after both treatments in both cultivars, but a less decrease was observed with the resistant cultivar. These results indicate that the CCRCM7 epitope likely contributed to the resistance of wax gourd to this pathogen, and JIM11 and JIM20 interacting extensins as well as LM2, LM14, MAC204 and JIM16 interacting AGPs were involved in the host-pathogen interaction.
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Affiliation(s)
- Dasen Xie
- Institute of Vegetable Research, Guangdong Academy of Agricultural Sciences, Guangzhou, 510640, China
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Mycosphaerella podagrariae—a necrotrophic phytopathogen forming a special cellular interaction with its host Aegopodium podagraria. Mycol Prog 2009. [DOI: 10.1007/s11557-009-0618-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Cymadothea trifolii, an obligate biotrophic leaf parasite of Trifolium, belongs to Mycosphaerellaceae as shown by nuclear ribosomal DNA analyses. Persoonia - Molecular Phylogeny and Evolution of Fungi 2009; 22:49-55. [PMID: 20198137 PMCID: PMC2789533 DOI: 10.3767/003158509x425350] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/01/2008] [Accepted: 02/13/2009] [Indexed: 11/25/2022]
Abstract
The ascomycete Cymadothea trifolii, a member of the Dothideomycetes, is unique among obligate biotrophic fungi in its capability to only partially degrade the host cell wall and in forming an astonishingly intricate interaction apparatus (IA) in its own hyphae, while the attacked host plant cell is triggered to produce a membranous bubble opposite the IA. However, no sequence data are currently available for this species. Based on molecular phylogenetic results obtained from complete SSU and partial LSU data, we show that the genus Cymadothea belongs to the Mycosphaerellaceae (Capnodiales, Dothideomycetes). This is the first report of sequences obtained for an obligate biotrophic member of Mycosphaerellaceae.
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Simon UK, Bauer R, Rioux D, Simard M, Oberwinkler F. The vegetative life-cycle of the clover pathogen Cymadothea trifolii as revealed by transmission electron microscopy. ACTA ACUST UNITED AC 2005; 109:764-78. [PMID: 16121562 DOI: 10.1017/s0953756205003035] [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: 11/07/2022]
Abstract
The vegetative life-cycle of Cymadothea trifolii (anamorph Polythrincium trifolii), causing sooty blotch of clover, is described using chemically as well as cryofixed and freeze-substituted samples. The pathogen enters the leaf through stomata and proliferates intercellularly. Nutrients are assumedly obtained via an interaction apparatus produced within the pathogen's hyphae, opposite to which the host cell is triggered to invaginate its plasmalemma. Rare attempts of 'self-parasitism' were also seen. Entering the conidial stage, stromata are laid down under the lower epidermis. The dying tissue above may explain the necrotic spots observed on infected leaflets. Foot cells in the conidial stromata produce thick-walled conidiophores, which grow sympodially. New conidiophores may grow into empty shells of old ones. Conidia are detached after pores between them and conidiophores have become plugged by organelles resembling Woronin bodies. Conidia are usually two-celled and their walls contain chitin and beta-1,3-glucans as indicated by labelling with gold-conjugated wheat germ agglutinin and anti-beta-1,3-glucan antibodies. Both conidiophores and conidia contain a structure which we regard as a new organelle with as yet unknown function.
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Affiliation(s)
- Uwe K Simon
- Universität Tübingen, Lehrstuhl Spezielle Botanik und Mykologie, Auf der Morgenstelle 1, D-72076 Tübingen, Germany.
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