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Thèses sur le sujet « Nematode diseases of plants Genetic aspects »

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Publié le 4 juin 2021

Mis à jour le 28 janvier 2023

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1

Williams, Kevin John. "Biological and genetic studies of wheat resistance to Heterodera avenae." Title page, summary and contents only, 1994. http://web4.library.adelaide.edu.au/theses/09PH/09phw7238.pdf.

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2

Taylor, Sharyn Patricia. "The root lesion nematode, Pratylenchus neglectus, in field crops in South Australia." Title page, contents and summary only, 2000. http://web4.library.adelaide.edu.au/theses/09PH/09pht2462.pdf.

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Includes bibliographical references (leaves 241-25). Aims to evaluate sampling procedures; assess the extent and magnitude of yield loss caused by Pratylenchus neglectus; assess the population dynamics of Pratylenchus neglectus in cereals; determine whether resistance occurs in field crops; and, assess whether variation occurs between geographically isolated species of Pratylenchus neglectus

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3

Vanstone, Vivien Alison. "The role of fungi and the root lesion nematode, Pratylenchus neglectus, in damaging wheat roots in South Australia." Title page, summary and contents only, 1991. http://web4.library.adelaide.edu.au/theses/09PH/09phv281.pdf.

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Includes bibliographical references (leaves 265-296). Pathogens associated with root damage were investigated in the Murray Mallee region of South Australia over the 1987-1989 growing seasons. Occurence of fungal species and the root lesion nematode (Pratylenchus neglectus) was assessed, and related to the appearance and severity of symptoms on the roots. Field experiments were supplemented with innoculation tests in the glasshouse and laboratory.

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4

Shrestha, Roshi. "A physiological and genetic mapping study of tolerance to root-knot nematode in rice." Thesis, Available from the University of Aberdeen Library and Historic Collections Digital Resources, 2008. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=24807.

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5

Maree, H. J. (Hans Jacob). "The expression of Dianthin 30, a ribosome inactivating protein." Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/53633.

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Thesis (MSc)--Stellenbosch University, 2003.<br>ENGLISH ABSTRACT: Ribosome inactivating proteins (RIPs) are currently classified as rRNA N-glycosidases, but also have polynucleotide: adenosine glycosidase activity. RIPs are believed to have anti-viral and anti-fungal properties, but the exact mechanism of these proteins still need to be elucidated.The mechanism of resistance however, appears to be independent of the pathogen. For resistance the RIP terminates virus infected plant cells and stops the reproduction and spread of the virus. Transgenic plants containing RIPs should thus be re

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6

Filkowski, Jody, and University of Lethbridge Faculty of Arts and Science. "The effect of pathogens on plant genome stability." Thesis, Lethbridge, Alta. : University of Lethbridge, Dept. of Biological Sciences, 2004, 2004. http://hdl.handle.net/10133/254.

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Resistance (R) genes, a key factor in determining the resistance of plants, have been shown often to be highly allelic entities existing in duplicated regions of the genome. This characteristic suggests that R-gene acquisition may have arisen through frequent genetic rearrangements as a result of transient, reduced genome stability. Tabacco plants transgenic for a recombination construct exhibited reduced genome stability upon infection with a virulent pathogen (tobacco mosaic virus). The reduced genome stability manifested as an increase in recombination events in the transgene. Such increase

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7

Van, Eeden C. (Christiaan). "The construction of gene silencing transformation vectors for the introduction of multiple-virus resistance in grapevines." Thesis, Stellenbosch : Stellenbosch University, 2004. http://hdl.handle.net/10019.1/53764.

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Thesis (MSc)--University of Stellenbosch, 2004.<br>ENGLISH ABSTRACT: Viruses are some of the most important pathogens of grapevines. There are no effective chemical treatments, and no grapevine- or other natural resistance genes have been discovered against grapevine infecting viruses. The primary method of grapevine virus control is prevention by biological indexing and molecular- and serological screening of rootstocks and scions before propagation. Due to the spread of grapevine viruses through insect vectors, and in the case of GRSPaV the absence of serological screening, these metho

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8

Ntushelo, Khayalethu. "Comparative studies on genetic variability and fungicide resistance in Tapesia yallundae." Thesis, Stellenbosch : Stellenbosch University, 1998. http://hdl.handle.net/10019.1/55834.

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Thesis (MScAgric)--Stellenbosch University, 1998.<br>ENGLISH ABSTRACT: Eyespot is an important disease of spring wheat (Triticum aestivum L.). Four species of Ramulispora are associated with this disease, of which Tapesia yallundae and T. acuformis. are common. This thesis investigates the broader subjects of genetic variability, reproductive dynamics and fungicide resistance in Tapesia yallundae. Each of the chapters treats specific but related topics. T. yallundae, which is the only species thus far reported from South Africa, has been associated with yield losses of up to 50%. To ena

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9

Blignaut, Marguerite. "The molecular and biological characterisation of ORF5 of three South African variants of Grapevine Vitivirus A." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/2421.

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Thesis (MSc (Genetics))--University of Stellenbosch, 2009.<br>Grapevine Vitivirus A (GVA), genus Vitivirus, family Flexiviridae is a well characterised single-stranded RNA virus that has been implicated in the grapevine diseases, Kober stem grooving and Shiraz disease. The virus infects both its host, Vitis vinifera and the experimental model plant, Nicotiana spp.. Biological studies performed on the virus in its herbaceous host, Nicotiana benthami- ana, revealed that many divergent variants of the virus exists in South Africa and can induce di erent symptoms in the model plant. Further

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10

Behjatnia, Seyyed Ali Akbar. "Characterisation of DNA replication of tomato leaf curl geminivirus /." Title page, contents and abstract only, 1997. http://web4.library.adelaide.edu.au/theses/09ACP/09acpb419.pdf.

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11

Galagedara, Nelomie Nayanathara. "Identification of Quantitative Trait Loci for Resistance to Tan Spot in Durum Wheat." Thesis, North Dakota State University, 2018. https://hdl.handle.net/10365/28765.

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Tan spot, caused by Pyrenophora tritici-repentis (Ptr), is a major foliar disease on wheat. The pathosystem involves three pairs of necrotrophic effector (NE) and host sensitivity (S) gene interactions, namely Ptr ToxA-Tsn1, Ptr ToxB-Tsc2 and Ptr ToxC-Tsc1. Additionally, genetic factors conferring race-nonspecific resistance have been identified. The objectives of this study were to map tan spot resistance QTL and investigate the role of NE-S interactions in disease in durum using association and bi-parental mapping. Evaluation of a worldwide collection of durum accessions allowed identifying

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12

Presello, Daniel A. "Studies on breeding of maize for resistance to ear rots caused by Fusarium spp. and on the occurrence of viruses in maize in eastern Canada." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=38260.

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Responses from pedigree selection for resistance to gibberella ear rot were assessed in four maize (Zea mays L.) populations, two selected after inoculation of Fusarium graminearum (Schwabe) macroconidia into the silk channel and two selected after inoculation into developing kernels. Responses were significant in both populations selected for silk resistance and in one of the populations selected for kernel resistance. Selection was more effective in later generations and genetic gains were associated with among-family selection but not with within-family selection. Results obtained here indi

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13

Du, Preez Jacques. "The construction of an infectious clone of grapevine virus A (GV A)." Thesis, Link to the online version, 2005. http://hdl.handle.net/10019/1012.

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14

Huang, Chunyuan. "Mechanisms of Mn efficiency in barley." 1996, 1996. http://web4.library.adelaide.edu.au/theses/09PH/09phh8739.pdf.

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Bibliography: leaves 131-153. This thesis investigates the mechanisms of manganese (Mn) efficiency (genetic tolerance to Mn-deficient soils) in barley (Hordeum vulgare L.) at both physiological and molecular levels.

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15

Mkhize, Thokozani M. "The detection of cherry leaf-roll nepovirus and the use of molecular markers for germplasm identification in walnuts (Juglans regia L.)." Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/53624.

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Thesis (MSc)--Stellenbosch University, 2003.<br>ENGLISH ABSTRACT: The aim of this study was to combine two common diagnostic tools: serological kits and genetic fingerprinting to identify cherry leaf-roll nepovirus (CLRV), and to establish a marker system to characterize walnut germplasm. The detection of plant viruses is difficult. Restrictions are imposed for quarantine purposes on the importation of plant material from foreign countries. Modern techniques such as a PCR based screening method for CLRV are required to ensure material do not harbour viruses. A primer pair was designed t

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16

Du, Min. "A greenhouse screening method for resistance to gray leaf spot in maize." Thesis, Virginia Tech, 1993. http://hdl.handle.net/10919/42953.

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17

Becker, John van Wyk. "Plant defence genes expressed in tobacco and yeast." Thesis, Stellenbosch : University of Stellenbosch, 2002. http://hdl.handle.net/10019/2924.

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18

Choe, Y. W. (Young Won). "DNA markers for cereal cyst nematode (Heterodera avenae Woll.) resistance gene in barley." 1995. http://web4.library.adelaide.edu.au/theses/09PH/09phc545.pdf.

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19

Choe, Y. W. (Young Won). "DNA markers for cereal cyst nematode (Heterodera avenae Woll.) resistance gene in barley / Y.W. Choe." Thesis, 1995. http://hdl.handle.net/2440/18680.

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20

Vanstone, Vivien Alison. "The role of fungi and the root lesion nematode, Pratylenchus neglectus, in damaging wheat roots in South Australia / Vivien Alison Vanstone." Thesis, 1991. http://hdl.handle.net/2440/19581.

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Includes bibliographical references (leaves 265-296).<br>vi, 296 leaves, [14] leaves of plates : ill. (some col.), maps ; 30 cm.<br>Pathogens associated with root damage were investigated in the Murray Mallee region of South Australia over the 1987-1989 growing seasons. Occurence of fungal species and the root lesion nematode (Pratylenchus neglectus) was assessed, and related to the appearance and severity of symptoms on the roots. Field experiments were supplemented with innoculation tests in the glasshouse and laboratory.<br>Thesis (Ph.D.)--University of Adelaide, Depts. of Plant Science and

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21

Farsi, Mohammad. "Genetic variation for tolerance and resistance to Pratylenchus neglectus / by Mohammed Farsi." 1995. http://hdl.handle.net/2440/18625.

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Bibliography: leaves 318-347.<br>ix, 347 [24] leaves : ill. (some col.) ; 30 cm.<br>Title page, contents and abstract only. The complete thesis in print form is available from the University Library.<br>A major problem in the production of agricultural crops including wheat, is the damage caused by destructive plant parasitic nematodes, among these the root lesion nematode (Pratylenchus spp.) The association of P. neglectus with fungi in ceraeal root disease has been reported. Infection is associated with leaf yellowing, which reduces plant photosynthesis and grain yield. In nematode infested

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22

Farsi, Mohammad. "Genetic variation for tolerance and resistance to Pratylenchus neglectus / by Mohammed Farsi." Thesis, 1995. http://hdl.handle.net/2440/18625.

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Bibliography: leaves 318-347.<br>ix, 347 [24] leaves : ill. (some col.) ; 30 cm.<br>A major problem in the production of agricultural crops including wheat, is the damage caused by destructive plant parasitic nematodes, among these the root lesion nematode (Pratylenchus spp.) The association of P. neglectus with fungi in ceraeal root disease has been reported. Infection is associated with leaf yellowing, which reduces plant photosynthesis and grain yield. In nematode infested soil, well fertilized crops are usually less affected.<br>Thesis (Ph.D.)--University of Adelaide, Dept. of Plant Scienc

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23

Williams, Kevin John. "Biological and genetic studies of wheat resistance to Heterodera avenae / by Kevin Williams." Thesis, 1994. http://hdl.handle.net/2440/21579.

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Copy of author's previously published article inserted.<br>Bibliography: leaves 60-75.<br>viii, 75, [40] leaves, [24] leaves of plates : ill. (some col.) ; 30 cm.<br>Thesis (Ph.D.)--University of Adelaide, Dept. of Crop Protection, 1995?

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24

Asiedu, Robert. "A study of resistance to cereal cyst nematode (`Heterodera avenae Woll.`) located in the rye genome of triticale / by Robert Asiedu." 1986. http://hdl.handle.net/2440/21224.

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Bibliography: leaves 133-152<br>iv, 152 leaves, [47] leaves of plates : ill. (1 col.) ; 30 cm.<br>Title page, contents and abstract only. The complete thesis in print form is available from the University Library.<br>Thesis (Ph.D.)--University of Adelaide, 1987

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25

Asiedu, Robert. "A study of resistance to cereal cyst nematode (`Heterodera avenae Woll.`) located in the rye genome of triticale / by Robert Asiedu." Thesis, 1986. http://hdl.handle.net/2440/21224.

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26

Taylor, Christopher 1966. "Cytogenetic and molecular genetic markers for chromosome 6R of rye linked to CCN resistance / by Christopher Taylor." 1996. http://hdl.handle.net/2440/18939.

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Includes bibliographies.<br>xiv, 175, [96] leaves, [17] leaves of plates : ill. (some col.) ; 30 cm.<br>Title page, contents and abstract only. The complete thesis in print form is available from the University Library.<br>This thesis reports on the generation of molecular tools for the analysis of chromosome 6R of rye and the application of these tools in structural analysis of 6RL. Results presented include physical and genetic maps of chromosome 6RL incorporating RFLP and PCR markers and CreR, the locus conferring resistance to cereal cyst nematode (CCN). The ability to detect small introge

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27

Mitchell, Aaron Thomas. "Genetic and molecular biological studies of annual ryegrass resistance to Anguina funesta / Aaron Thomas Mitchell." 2002. http://hdl.handle.net/2440/21972.

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"December 2002"<br>Corrections on back page.<br>Bibliography: leaves 118-129.<br>129 leaves : ill. ; 30 cm.<br>Title page, contents and abstract only. The complete thesis in print form is available from the University Library.<br>Annual ryegrass toxicity (ARGT) occurs in grazing animals following the ingestion of seedheads of the annual ryegrass Lolium rigidum, infested with the corynetoxin-producing bacteria, Rathayibacter toxicus. Breaking the disease cycle, through the use of lines of L. rigidum resistant to the nematode Anguina funesta can be used to reduce th risk of ARGT outbreaks. In L.

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28

Hughes, Peter A. "Mode of action and protective effects of small basic protein toxins in transgenic plants." Phd thesis, 1997. http://hdl.handle.net/1885/145680.

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29

Raisheed, Muhammad Saif-ur. "Tissue targeting signals of Tomato leaf curl virus." Thesis, 2007. http://hdl.handle.net/2440/63571.

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The tissue and intracellular distribution of the monopartite Tomato leaf curl virus (TLCV) was investigated by in situ hybridization. contrary to the previous understanding of geminiviral localization, single stranded (SS) DNA of TCLV accumulated in the cytoplasm. TCLV ssDNA was also found in the nucleus, as were levels of replicative form doubl-stranded (ds)DNA.<br>Thesis (Ph.D.) -- University of Adelaide, School of Agriculture, Food and Wine, 2007

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30

Gilbert, Brian M. "Characterization of the response mediated by the plant disease susceptibility gene LOV1." Thesis, 2012. http://hdl.handle.net/1957/34284.

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Victoria blight, caused by fungus Cochliobolus victoriae, is a disease originally described on oats and recapitulated on Arabidopsis. Victoria blight is used as a model plant disease that conforms to an inverse gene-for-gene interaction. C. victoriae virulence is dependent upon its production of victorin, a host-specific toxin that induces programmed cell death in sensitive plants. In oats, victorin sensitivity and disease susceptibility is conferred by the Vb gene, which is genetically inseparable from the Pc-2 crown rust resistance gene. In Arabidopsis, victorin sensitivity and disease s

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31

"Disease resistance related genes co-regulated in bacterial leaf blight near isogenic lines, Xa2, Xa12 and Xa14." 2004. http://library.cuhk.edu.hk/record=b5891981.

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Shuk-man Chow.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2004.<br>Includes bibliographical references (leaves 171-186).<br>Abstracts in English and Chinese.<br>Thesis committee --- p.i<br>Statement --- p.ii<br>Abstract --- p.iii<br>Acknowledgement --- p.viii<br>General abbreviations --- p.x<br>Abbreviations of chemicals --- p.xi<br>List of figures --- p.xii<br>List of Tables --- p.xiii<br>Table of contents --- p.xv<br>Chapter 1. --- Literature review<br>Chapter 1.1. --- General introduction to rice disease --- p.1<br>Chapter 1.1.1. --- Pathogenesis of Bacterial Leaf Bligh

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32

Behjatnia, Seyyed Ali Akbar. "Characterisation of DNA replication of tomato leaf curl geminivirus / Seyyed Ali Akbar Behjatnia." Thesis, 1997. http://hdl.handle.net/2440/14766.

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Bibliography: leaves 133-152.<br>xi, 152 leaves : ill. (some col.), col. map ; 30 cm.<br>Studies biological relatedness of strains of tomato leaf curl virus and cross-interaction with the replication-associated protein requireed for DNA replication.<br>Thesis (Ph.D.)--University of Adelaide, Dept. of Crop Protection, 1997

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33

Wilson, Ryan. "Functional studies of the Cf-9/Avr9 interaction." Phd thesis, 2003. http://hdl.handle.net/1885/151590.

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34

Sow, Mounirou El-Hassimi. "Genetic diversity of Oryza species in Niger ; screening and breeding for resistance to rice yellow mottle virus (RYMV)." Thesis, 2012. http://hdl.handle.net/10413/8520.

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Rice is a staple food in many West African countries, including Niger. However, both regional and national rice production have failed to meet demand due to several constraints, among which is the Rice yellow mottle virus (RYMV). Moreover, attempted intensification of rice cultivation and the introduction of modern cultivars are encouraging farmers towards abandoning local landraces for high yielding, but often susceptible varieties. The study was primarily oriented towards rice pre-breeding, and identifying priorities for rice breeding in Niger in relation to farmers' preferences and their en

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35

Mweshi, Mukanga. "Genetic improvement of Zambian maize (Zea mays L.) populations for resistance to ear rots and a survey of associated mycotoxins." Thesis, 2009. http://hdl.handle.net/10413/519.

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Maize ear rots are among the most important impediments to increased maize production in Africa. Besides yield loss, they produce mycotoxins in their host whose contamination has been linked to several human and animal mycoses. The main objectives of the studies reported on in this thesis were (i) to investigate farmer perceptions of maize ear rot disease and prospects for breeding for host plant resistance in Zambia; and (ii) to establish the levels of incidence and extent of maize ear rot infection as well as the level of mycotoxins in the maize crops of smallholder farms in central and sout

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36

Barker, Claire Louise. "An Examination of the signalling capacity of the tomato Cf-9 disease resistance protein." Phd thesis, 2002. http://hdl.handle.net/1885/148656.

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37

Chakrabarti, Apratim. "Structure-function analysis of Cf-9 and Cf-9B resistance proteins from tomato (Lycopersion [i.e. Lycopersicon] esculentum Mill.)." Phd thesis, 2005. http://hdl.handle.net/1885/149669.

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Panter, Stephen Neil. "Functional domains, expression and potential dimerisation of the Cf-9 and Cf-9B fungus resistance proteins of tomato (Lycopersicon esculentum Mill.)." Phd thesis, 2001. http://hdl.handle.net/1885/151625.

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39

Huang, Chunyuan. "Mechanisms of Mn efficiency in barley / by Chunyuan Huang." Thesis, 1996. http://hdl.handle.net/2440/18731.

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Bibliography: leaves 131-153.<br>xiii, 153 leaves : ill. (some col.) ; 30 cm.<br>This thesis investigates the mechanisms of manganese (Mn) efficiency (genetic tolerance to Mn-deficient soils) in barley (Hordeum vulgare L.) at both physiological and molecular levels.<br>Thesis (Ph.D.)--University of Adelaide, Dept. of Plant Science, 1996

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40

Moodley, Vaneson. "Development of a pepper (Capsicum annuum L.) hybrid variety with resistance to potato virus Y (PVY) using molecular breeding." Thesis, 2013. http://hdl.handle.net/10413/10829.

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Pepper (Capsicum annuum L.) is an important vegetable crop grown and consumed worldwide. Potato virus Y (PVY) is a globally economically important pathogen which significantly reduces the yield and quality of cultivated pepper. The virus is considered as a major limiting factor to the economic production of pepper in the province of KwaZulu-Natal (KZN) in the Republic of South Africa (RSA). Many applied practices to control the spread of PVY are ineffective to mitigate the losses incurred by many farming communities across the KZN province. Therefore, the objectives of this study was to determ

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41

Mengesha, Wende Abera. "Genetic diversity, stability, and combining ability of maize genotypes for grain yield and resistance to NCLB in the mid-altitude sub-humid agro ecologies of Ethiopia." Thesis, 2013. http://hdl.handle.net/10413/10935.

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Maize (Zea mays L.) is the third most important cereal crops in the world after wheat and rice. In Ethiopia, maize remains the second largest food security crop after tef [Eragrostis tef (Zucc.) Trotter.]. The mid-altitude, sub-humid agro-ecology (1000 to 1800 m above sea level) is the most important maize producing environment in Ethiopia. However, productivity of maize is low, due to several biotic and abiotic constraints. Among the biotic constraints, Turcicum leaf blight disease of maize caused by Exserohilum turcicum Pass Leonard & Suggs shows high incidence of 95-100% and inflicts signif

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42

Mariote, David. "Response to selection for downy mildew (Peronosclerospora sorghi) and maize streak virus resistance in three quality protein maize populations in Mozambique." Thesis, 2007. http://hdl.handle.net/10413/748.

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43

Ibaba, Jacques Davy. "Characterization of potato virus Y (PVY) isolates infecting solanaceous vegetables in KwaZulu-Natal (KZN), Republic of South Africa (RSA)." Thesis, 2009. http://hdl.handle.net/10413/613.

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Potato virus Y (PVY) is an economically important virus worldwide. In South Africa, PVY has been shown to be a major limiting factor in the production of important solanaceous crops, including potato (Solanum tuberosum L.), pepper (Capsicum annuum L.), tomato (Lycopersicon esculentum Mill.) and tobacco (Nicotiana spp). The variability that PVY displays, wherever the virus occurs, merits the study of the isolates occurring in KwaZulu-Natal (KZN) in the Republic of South Africa (RSA). This characterization will provide a clear understanding of strains/isolates from local vegetables and how they

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44

Kam, Honore. "A study of the diversity of Burkina Faso rice landraces and identification of source of resistance to rice yellow mottle virus (RYMV)." Thesis, 2011. http://hdl.handle.net/10413/8518.

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The main goals of this study were to ascertain farmers' preferred traits in rice landraces and their perception of Rice yellow mottle virus, to collect rice landraces across Burkina Faso, investigate their genetic diversity, and to exploit this diversity in a search for varieties resistant and tolerant to RYMV, for their utilisation in rice breeding. Farmers' preferred traits, approaches to crop management, and disease perceptions were assessed using a Participatory Research Appraisal (PRA) approach. In the main rice growing regions of Burkina Faso, 330 rice landraces were collected. The agro-

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45

Bucheyeki, Tulole Lugendo. "Characterization and genetic analysis of maize germplasm for resistance to northern corn leaf blight disease in Tanzania." Thesis, 2012. http://hdl.handle.net/10413/8730.

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The majority of farmers in Tanzania have not yet adopted modern maize varieties and still cultivate landraces and open pollinated varieties (OPVs) with low production potential and susceptible to diseases like maize streak virus (MSV), grey leaf spot (GLS) and northern corn leaf blight (NLB). The NLB disease is among the major causes of low yield and has been reported in all 21 maize growing regions in Tanzania. Breeding for host plant resistance with high yielding potential and involving the community in the breeding process is expected to address the problem of low yield, NLB disease suscept

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46

Mhora, Terence Tariro. "Genomics of quantitative resistance to brown rust (Puccinia melanocephala) in a sugarcane breeding population." Thesis, 2012. http://hdl.handle.net/10413/10036.

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The Sugarcane Industry contributes approximately 400 000 jobs and ZAR 8 billion annually to South Africa’s economy. Due to climate change and the subsequent threat posed by disease, these figures have been on the decline. Brown rust, a contributor to this decline is caused by the basidiomycete Puccinia melanocephala Syd. and P. Syd., which previously resulted in 50% yield losses in susceptible varieties. This highlighted the need for improved screening and breeding techniques which will result in the replacement of susceptible varieties. The objectives of this study were to: a) Adopt and optim

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Mafu, Nothando Fowiza. "Marker-assisted selection for maize streak virus resistance and concomitant conventional selection for Downy Mildew resistance in a maize population." Thesis, 2013. http://hdl.handle.net/10413/10023.

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Maize streak virus (MSV) disease, transmitted by leafhoppers (Cicadulina mbila, Naude), and maize downy mildew (DM) disease caused by Peronosclerospora sorghi (Weston and Uppal) Shaw, are major contributing factors to low maize yields in Africa. These two diseases threaten maize production in Mozambique, thus the importance of breeding Mozambican maize varieties that carry resistance to these diseases. Marker-assisted selection (MAS) was employed to pyramid MSV and DM disease resistant genes into a single genetic background through simultaneous selection. Firstly, it was essential to determine

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Gichuru, Lilian Njeri. "Breeding investigations on utility of maize streak virus resistant germplasm for hybrid development in the tropics." Thesis, 2014. http://hdl.handle.net/10413/10694.

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Maize (Zea mays L.) supports millions of livelihoods in sub-Saharan Africa (SSA) in terms of food and feed. Production of the crop is however limited by several factors, among these, maize streak virus (MSV) disease. Although extensively studied, MSV remains a serious problem in SSA due to several challenges in breeding MSV resistant maize varieties. These include integration of MSV resistant germplasm from different backgrounds, reliance on a few resistant sources, and genotype x environment interactions. This study was designed to assess the breeding potential of several MSV resistant

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"Studies on brown rust (Puccinia melanocephala) of sugarcane in South Africa." Thesis, 2009. http://hdl.handle.net/10413/2625.

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The first serious outbreak of brown rust of sugarcane caused by Puccinia melanocephala Syd. & P. Syd. was reported in India in 1907. It was first reported in South Africa (SA) in 1941 on the variety Co301 and is now present in almost all the sugarcane growing areas of the world. In SA, it is now described as an important disease of sugarcane, causing yield losses of up to 26% in susceptible varieties. Within the SA sugar industry, rust is controlled through the use of resistant varieties as it is the most economical method of control. However, most of the newer varieties that are being release

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Chikoti, Patrick Chiza. "Development of cassava (Manihot esculenta Crantz) cultivars for resistance to cassava mosaic disease in Zambia." Thesis, 2011. http://hdl.handle.net/10413/8402.

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Despite the increasing number of farmers growing cassava in Zambia, yield per hectare has remained low at 5.8 t ha-1. The major constraints contributing to low yields are pests and diseases of which cassava mosaic disease (CMD) caused by East Africa cassava mosaic virus (EACMV), Africa cassava mosaic virus (ACMV) and South Africa mosaic virus (SACMV) is the most important. Breeding of cassava is restricted by limited information on viruses and associated satellites, and farmer preferences. Most of the farmers cannot manage to institute control strategies that require buying of chemicals. The m

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