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Dissertations / Theses on the topic 'Soil-borne pathogen'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 March 2023

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1

Siasou, Eleni. "Interactions among a soil-borne pathogen, mycorrhizal fungi and rhizobacteria." Thesis, University of Aberdeen, 2010. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=159205.

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Wheat crops are known to be devastated by infections of soil-borne pathogens, especially the fungus <i>Gaeumannomyces graminis </i>var. <i>tritici</i> (Ggt) that causes ‘take-all’. Plant growth promoting rhizobacteria (PGPR) such as <i>Pseudomonas fluorescens</i> have received much attention as biocontrol agents against Ggt, mainly due to their ability to produce antibiotics. The polycetide secondary antimicrobial metabolite 2,4-diacetylphloroglucinol (DAPG) is produced by a number of fluorescent pseudomonad strains and is known to suppress Ggt. Another soil microbial group which have been und

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2

Cunha, Felisberta Maria Jesus. "The influence of extracts of Ascophvllum nodosum on plant and soil-borne pathogen interactions." Thesis, University of Plymouth, 2002. http://hdl.handle.net/10026.1/2348.

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This thesis presents an investigation into the responses to extracts of Ascophyllum nodosum (Maxicrop seaweed extracts - MSE) of two different plants species - wheat and strawberry, and their interactions with two soil-borne pathogens, Gaeumannomyces graminis and Phytophthora fragariae respectively, under various environmental conditions. The responses to MSE using hydroponic, glasshouse and field experiments showed that levels of Take-all infection in wheat were reduced by some of the treatments applied. Repeat experiments showed that consistency of results was poor but a positive trend for d

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3

Long, Deborah Margaret. "Sensitivity analyses in scaling from pathozone to population behaviour for a soil-borne plant pathogen." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621289.

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4

Bonaldi, M. "STREPTOMYCETES AS BIOLOGICAL CONTROL AGENTS AND PLANT GROWTH-PROMOTING BACTERIA." Doctoral thesis, Università degli Studi di Milano, 2014. http://hdl.handle.net/2434/247475.

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Developing no-chemical strategies for the control of soil borne pathogens is one of the major issues for the cultivation of leafy vegetables. The application of Biological Control Agents (BCAs) represents a valuable approach and nowadays some biocontrol products are available on the market for greenhouse and field applications. However, these products often show lack of consistency and variable results mainly due to the poor knowledge about their biology and modes of applications and how the agroecosystem components modulate their efficacy. Streptomycetes are soil inhabitants and have an impo

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5

Huh, Jung-Hyun. "Biochemical, Molecular and Functional Analysis of Volatile Terpene Formation in Arabidopsis Roots." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/77151.

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Plants produce secondary (or specialized) metabolites to respond to a variety of environmental changes and threats. Especially, volatile compounds released by plants facilitate short and long distance interaction with both beneficial and harmful organisms. Comparatively little is known about the organization and role of specialized metabolism in root tissues. In this study, we have investigated the root-specific formation and function of volatile terpenes in the model plant Arabidopsis. As one objective, we have characterized the two root-specific terpene synthases, TPS22 and TPS25. Both en

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6

Yadav, Heena [Verfasser], Bettina [Gutachter] Hause, Edgar [Gutachter] Peiter, and Franziska [Gutachter] Krajinski-Barth. "Interactions of Medicago truncatula with soil-borne microbes : role of MtTPS10 in defense against the root pathogen Aphanomyces euteiches / Heena Yadav ; Gutachter: Bettina Hause, Edgar Peiter, Franziska Krajinski-Barth." Halle (Saale) : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2019. http://d-nb.info/1210728192/34.

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7

Volossiouk, Tatiana. "Development of PCR-mediated diagnostics for soil-borne plant pathogens." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq24516.pdf.

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8

Retief, Liezl. "Molecular detection and characterisation of potentially zoonotic bacteria in bathyergids from the Western Cape Province." Diss., University of Pretoria, 2017. http://hdl.handle.net/2263/67139.

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Globally emphasis has been given to identify emerging and re-emerging pathogens. Rapid urban expansion creates a problem which is two-fold. Firstly, increasing slum living conditions due to inadequate rate of infrastructure development results in an increased reliance on natural resources, including the capture and consumption of surrounding wildlife to subsist, thereby facilitating the transfer of emergent zoonotic pathogens. Secondly, through activities such as pollution or alien species introductions, the rapid transformation of once pristine environments, alters natural systems, poten

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9

Taylor, Fiona Isabelle. "Control of soil borne potato pathogens using Brassica spp. mediated biofumigation." Thesis, University of Glasgow, 2013. http://theses.gla.ac.uk/4854/.

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Biofumigation is being increasing used as alternative control method for soil borne pathogens. This method exploits toxic compounds, specifically isothiocyanates (ITCs), which are released during the breakdown of Brassica plant tissues. To date field and glasshouse experimentation assessing the potential for using biofumigation to control agricultural pests and pathogens have produced promising results. Yet large gaps still remain in the specifics of the biofumigation process. It is hoped that further research to analyse how specific toxic compounds produced during Brassica tissue breakdown, s

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10

Cerdà, Alexandra Puértolas. "Detection and management of soil-borne pathogens in the nursery trade." Thesis, University of Aberdeen, 2017. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=235373.

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International trade in plants, especially with potting substrates, is recognised as the main pathway of plant pathogen dissemination on a global scale. In the last 20 years, the wide use of internet commerce has become common in the nursery sector and, due to the nature of online sales, may be aggravating this risk. Oomycetes in the genera Phytophthora, Pythium and Phytopythium, cause a range of important plant diseases, responsible for serious economic and biological losses. This research focused on the detection of Oomycetes in imported potted ornamental plants in the UK and The Netherlands,

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11

Levenfors, Jens. "Soil-borne pathogens in intensive legume cropping - Aphanomyces spp. and root rots /." Uppsala : Dept. of Plant Pathology and Biocontrol Unit, Swedish Univ. of Agricultural Sciences, 2003. http://epsilon.slu.se/a393.pdf.

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12

Cunniffe, Nicholas James. "Modelling dispersal of soil-borne plant pathogens and efficacy of biological control." Thesis, University of Cambridge, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612498.

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13

Sodja, Eric P. "Effects of Soil-Borne Pathogens on Seedling Establishment Patterns in Forest Systems." DigitalCommons@USU, 2019. https://digitalcommons.usu.edu/etd/7703.

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The Janzen-Connell mechanism is proposed to maintain plant diversity: predators and diseases of seeds reduce the number of seeds that survive near a parent tree, but allow seeds far from the parent tree to grow into adulthood. In the area where seeds don’t survive, seedlings from other tree species which are not affected by the seed consumer can grow. At large scales, this effect is thought to increase overall plant diversity. Soil-borne pathogens can contribute to seed mortality in this way, but we don’t know how important different parts of their lifecycle are in creating Janzen-Connell patt

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14

Murray, Donna. "Interactions of Pseudomonas fluorescens and soil-borne oomycete plant pathogens in a biological control system." Thesis, University of Nottingham, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259856.

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15

Hollingsworth, Teresa Déirdre. "A theoretical framework for the spatial spread of soil-borne fungal plant pathogens." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.604173.

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The spread of mycelia through soil is the main process by which many economically important plant pathogens are transmitted between plants. Using mathematical modelling, this thesis provides a framework for investigating the interaction between soil structure and fungal growth, with a view to controlling this spread. Fungal dynamics are modelled at the scale of groups of hyphae by a stochastic cellular automaton (CA), with the cells of the CA corresponding to the network of pore species in the soil. The fungal model captures the characteristics of mycelial growth at this scale, whilst maintain

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16

Higuita, Didier Mauricio Chavarriaga. "Biological control of Fusarium spp. and other soil-borne pathogens on tree seedlings." Thesis, University of Aberdeen, 2003. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU602315.

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Soil borne fungi isolated from forest areas and nurseries in North east of Scotland using baiting techniques, were identified using classical taxonomy and molecular methods (PCR amplification of ITS regions; restriction digestion; sequencing of PCR products) as Fusarium lateritium, F. tricinctum, F. sambucinum, Phytophthora cinnamomi, Pythium ultimum var. ultimum and Rhizoctonia binucleate (Ceratobasidium sp.). Virulence was tested in vitro on young seedlings of Pinus sylvestris and Alnus glutinosa, and Koch's postulates fulfilled through reisolation of the pathogens and confirmation of fungal

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17

Bailey, Douglas John. "The role of inoculum in the primary and secondary infection of certain plant pathogens." Thesis, Open University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388433.

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18

Chidburee, Siripun. "Biological control of soil-borne disease in soybean by denitrifying antagonistic bacteria : the possible role of reduced nitrogen compounds for control of plant pathogens." Thesis, University of Aberdeen, 1998. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU602299.

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A number of experiments were carried out to study the potential of denitrifying bacteria and reduced nitrogen compounds for control of soil-borne damping-off pathogens. Measurement of the rhizosphere pH of growing soybean roots was carried out in soil adjusted to different pH states and packed into sheet microcosms. The results showed that the rhizosphere pH of soybean was lower than the bulk soil. Nitrate reductase activity and nitrite production was then characterised for the rhizosphere of intact 14 day-old soybean roots that were incubated in nitrate substrates adjusted to different pH val

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19

Guimarães, Izabel Macedo. "Reação de germoplasmas de melão a Fusarium solani f. sp. cucurbitae e herança da resistência do acesso AC-33 a Monosporascus cannonballus." Universidade Federal Rural do Semi-Árido, 2016. http://bdtd.ufersa.edu.br:80/tede/handle/tede/584.

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20

Van, Loenen Mariska C. A. "Treatment of soil-borne fungal pathogens Sclerotinia sclerotorium, Sclerotium cepivorum, Verticillium dahliae and Pythium ultimum, potato cyst nematodes Globodera rostochiensis and Globodera pallida, and weeds Chenopodium album and Agropyron repens with low-temperature/short-duration steam and with ozone gas." Thesis, University of Aberdeen, 2003. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU602318.

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Methyl bromide is a widely used soil disinfectant that, because of its ozone depleting properties, is being phased out in the EC by 2005. Soil steaming is a well-established system of soil disinfestation and is increasingly seen as a viable option to methyl bromide replacement. Traditional glasshouse steaming techniques create a number of problems because it involves treatment of soil with high-temperature (100-140°C) steam for up to eight hours or more. This not only eliminates unwanted soil-borne pests and diseases, but also creates a ‘biological vacuum’, in which target pests and pathoge

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21

Chung, Chen-Yen, and 鍾成晏. "Establishment of immunocapture PCR method to detect soil-borne plant pathogen Pythium myriotylum and P. violae." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/87941952552252686197.

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碩士<br>東吳大學<br>微生物學系<br>88<br>An immunocapture-polymerase chain reaction (IC-PCR) based method was developed to detect Pythium myriotylum Drechsler and P. violae Chester & Hickman which caused ginger rot and carrot cavity spot, respectively. Polyclonal antibody against P. myriotylum was purified from rabbit immune serum with a titer of 1:4000. The cross-reactivity was widespread among 28 Pythium species. and fungal isolates of other 14 genera. There was 0.25%, 0.43%, and 2.5% oospores of P. myriotylum recovered by immunocapture (IC) from 10 g natural soil with 105, 104 or 103 oospores, respe

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22

Balendres, MAO. "Biology and chemical ecology of Spongospora subterranea during resting spore germination : towards a germinate/exterminate control approach for Spongospora diseases of potato." Thesis, 2017. https://eprints.utas.edu.au/23757/1/Balendres_whole_thesis.pdf.

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Resting spores are important for the spread and survival of Spongospora subterranea, the causative agent of potato powdery scab and root disease. However, resting spores must germinate and release zoospores (the infective agents) to cause infection. Understanding of the germination process and factors is, therefore, important. The knowledge can potentially have implications for resting spore-inoculum management and Spongospora disease control. The biology and ecology of S. subterranea during resting spore germination is not well understood. Knowledge of factors influencing resting spore germin

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23

Latz, Ellen. "Unravelling mechanisms linking plant diversity to plant-disease suppression." Doctoral thesis, 2015. http://hdl.handle.net/11858/00-1735-0000-0022-608E-7.

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24

Ortiz, Anthony M. "Sustainable control of soil-borne pathogens in dryland taro cropping systems." Thesis, 2005. http://hdl.handle.net/10125/20921.

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25

Viviers, Johnny. "Incidence and etiology of maize seedling blight and control of soil borne pathogens using seed treatments / Johnny Viviers." Thesis, 2014. http://hdl.handle.net/10394/15801.

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Seedling blight of maize has significantly influenced field crop stands and seedling vigour over various localities and seasons. The extent of the problem is influenced by a number of factors which includes soil temperature (generally below 13 °C), waterlogged soils, inadequate fertilization, herbicide damage and fungal pathogens. The fungi generally causing seedling damping off are often involved in a complex and succession over time varying in importance depending on the field circumstances at a given time. These generally include the Pythium spp., Rhizoctonia spp. and various Fusarium spp.

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26

Molina, Oscar Ivan. "Effect of green manures and organic amendments on Verticillium wilt of potato in Manitoba." 2011. http://hdl.handle.net/1993/4513.

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In Manitoba, potato fields have been found to be infested with Verticillium dahliae, which can produce Vertcillium wilt disease severity of up to 90% and reduce yield. Potato producers have then an increased interest on use of green manures and organic amendments to control Verticillium wilt. The objectives of this research were to evaluate selected green manure and organic amendments for their ability to reduce propagule density of V. dahliae in soil, incidence and severity of Verticillium wilt, and to enhance potato yield in Manitoba. In addition, a second study was conducted for the purpose

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27

Laurentin, Hernan. "Genetic diversity in sesame (Sesamum indicum L.): molecular markers, metabolic profiles and effect of plant extracts on soil-borne pathogenic fungi." Doctoral thesis, 2007. http://hdl.handle.net/11858/00-1735-0000-0006-AFF9-1.

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28

Hlokwe, Mapula Tshepo Pertunia. "The efficacy of mosonia burkeana, moringa oleifera and trichoderma harzianum on tomato soil-borne fungal pathogens fusarium oxysporum and rhizoctonia solani under in vitro and in vivo conditions." Thesis, 2018. http://hdl.handle.net/10386/2415.

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Thesis (M.Sc. (Agriculture)) --University of Limpopo, 2018<br>Tomato is second most cultivated crop globally and in South Africa it is planted by both commercial and smallholder farmers. However, the crop is susceptible to a number of diseases including those caused by fungal pathogens. Fusarium wilt caused by Fusarium oxysporum f. sp. lycopersici and seedling damping-off caused by Rhizoctonia solani, are known to cause serious yield loss in tomato production. Their management is mainly based on the application of synthetic fungicides and cultural practices. However, both methods have li

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29

Laurentin, Táriba Hernán E. [Verfasser]. "Genetic diversity in sesame (Sesamum indicum L.) : molecular markers, metabolic profiles and effect of plant extracts on soil-borne pathogenic fungi / presented by Hernán E. Laurentin T." 2007. http://d-nb.info/985332018/34.

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30

"FUNCTIONAL DIVERSITY OF FUNGI ASSOCIATED WITH DURUM WHEAT ROOTS IN DIFFERENT CROPPING SYSTEMS." Thesis, 2013. http://hdl.handle.net/10388/ETD-2013-06-1123.

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Differences in pea (Pisum sativum L.) and chickpea (Cicer arietinum L.) microbial compatibility and/ or their associated farming practices may influence root fungi of the following crop and affect the yield. The main objective of this research was to explain the difference in durum wheat (Triticum turgidum L.) yield the year after pea and chickpea crops through changes in the functional diversity of wheat root fungi. The effect of fungicides used on chickpea on the root fungi of a following durum wheat crop was studied using plate culture and pyrosequencing. Pyrosequencing detected more Fusari

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