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Author : Nguyen Quoc Manh
Publisher :
ISBN 13 :
Total Pages : 110 pages
Book Rating : 4.:/5 (142 download)
Download or read book Inheritance of Resistance to Gray Leaf Spot in Maize written by Nguyen Quoc Manh and published by . This book was released on 1977 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Min Du
Publisher :
ISBN 13 :
Total Pages : 116 pages
Book Rating : 4.:/5 (285 download)
Download or read book A Greenhouse Screening Method for Resistance to Gray Leaf Spot in Maize written by Min Du and published by . This book was released on 1993 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Stephen Thompson Coates
Publisher :
ISBN 13 :
Total Pages : 372 pages
Book Rating : 4.:/5 (369 download)
Download or read book Inheritance of Resistance to Gray Leaf Spot of Corn written by Stephen Thompson Coates and published by . This book was released on 1996 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: Twenty-four corn inbreds, selected for resistance to gray leaf spot (caused by Cercospora zeae-maydis) in 1989 and 1990, were crossed with the susceptible inbreds FR1141 and/or FR20 and populations of four to six generations were produced. In 1991, the populations were evaluated for gray leaf spot severity at Urbana, Illinois and at Andrews, North Carolina. Using generation mean analysis, additive genetic effects were found significant for most populations and dominance effects were found significant for eight populations. Significant parameter estimates for dominance effects were negative indicating dominance for resistance. Five inbred lines 061, 198, B37HtN, DS:74:1071, and (OH43x#8brbr) were selected for further evaluation based on their level of resistance, results from the generation mean analysis, and maturities useful for breeding in Central Illinois. The five inbred lines selected in 1991 were crossed with FR1141. The inbreds 061, B37HtN, and (OH43x#8brbr) also were crossed with the inbreds FR20, B37, and OH43 respectively. Eight populations of six to nine generations were produced from these crosses and evaluated for gray leaf spot severity in 1992 and 1993 at Urbana, Illinois and Andrews, North Carolina. Individual plants were rated for gray leaf spot severity by visually estimating the percent leaf area blighted in August and again in September. Analyses of variance indicated significant interactions between generations and environments and rating times for certain populations. Generation mean analyses indicated that pooled additive effects and pooled dominance effects were adequate to explain the inheritance of resistance for three populations, FR20 x 061, FR1141 x (OH43x#8brbr), and OH43 x (OH43x#8brbr). For the other populations there were significant deviations from the additive-dominance model at certain year-location-rating time combinations. For the FR1141 x DS:74:1071 population, additive effects were most important. Significant dominance effects were most frequently detected at early rating times and were most important for the FR1141 x 061, FR1141 x 198, FR1141 x (OH43x#8brbr), and OH43 x (OH43x#8brbr) populations. Epistatic effects were most important for the B37 x B37HtN population. Based on the level of resistance, heritability estimates, and estimates of effective factors for these populations, genes for resistance from these inbred lines should be useful in improving corn belt germplasm for resistance to gray leaf spot.
Author : Jacqueline Marie Benson
Publisher :
ISBN 13 :
Total Pages : 254 pages
Book Rating : 4.:/5 (913 download)
Download or read book Resistance to Gray Leaf Spot of Maize written by Jacqueline Marie Benson and published by . This book was released on 2013 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gray leaf spot (GLS) is a foliar disease of maize caused by Cercospora zeae-maydis and Cercospora zeina and quantitative resistance to GLS is important for maize production. A nested association mapping (NAM) maize population, consisting of 25 populations of 150 recombinant inbred lines, was used to identify quantitative trait loci (QTL) for GLS resistance. Trials were conducted in Blacksburg, VA, in a field with high natural incidence of GLS. A multivariate mixed model was used in ASReml3 to give the best linear unbiased predictions of disease severity ratings. QTL were selected using a general linear model selection procedure in SAS 9.2. Sixteen QTL, distributed across the maize genome, were identified using a likelihood of odds (LOD) selection threshold>4. Seven of these 16 QTL displayed allelic series with significantly higher and lower effects than the common parent allele. Near-isogenic lines (NILs) extracted from heterogeneous inbred families were developed to confirm and further finemap select QTL, targeting the loci with the greatest LOD scores from the model selection QTL analysis. Phenotypic characterization of the NILs confirmed that the loci in bins 1.04, 2.09 and 4.05 likely contribute significantly to disease resistance, with bins 1.04 and 2.09 conferring reductions in disease of 12% and 23%, respectively. In contrast, the susceptible allele in bin 4.05, which was associated with the distance between major veins, conferred an increase of 8.4%. This disease-related venation trait was confirmed using the 4.05 NILs. Genome-wide association studies revealed candidate genes related to the production of carotenoids, anthocyanins and antioxidant compounds that may play a role in cercosporin detoxification. Expression analysis of 1.05 NILs treated with cercosporin implicated a flavin-monooxygenase gene in cercosporin detoxification. Furthermore, significant associations between NAM parental allelic effects and parental phenotypes at the microscopic level for the 1.02 and 1.06 loci implicated callose plug and phenolic accumulation, respectively, in host defense. Elucidating the genetics of quantitative disease resistance loci provides breeders with valuable information that may enhance their ability to use molecular markers as a means to rapidly introgress loci that provide quantitative disease resistance.
Author : Matthew L. Ramage
Publisher :
ISBN 13 :
Total Pages : 106 pages
Book Rating : 4.:/5 (522 download)
Download or read book Quantitative Trait Loci Identification of Gray Leaf Spot Resistance in Maize written by Matthew L. Ramage and published by . This book was released on 2000 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Anke Lehmensiek
Publisher :
ISBN 13 :
Total Pages : 312 pages
Book Rating : 4.:/5 (668 download)
Download or read book Genetic Mapping of Gray Leaf Spot Resistance Genes in Maize written by Anke Lehmensiek and published by . This book was released on 2000 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : David Matthew Bubeck
Publisher :
ISBN 13 :
Total Pages : 452 pages
Book Rating : 4.:/5 (243 download)
Download or read book Molecular and Biometric Evaluation of Gray Leaf Spot and Southern Corn Leaf Blight Resistance in Maize written by David Matthew Bubeck and published by . This book was released on 1991 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Barnabas Anthony Kiula
Publisher :
ISBN 13 :
Total Pages : 272 pages
Book Rating : 4.:/5 (234 download)
Download or read book Increasing Line Combining Ability and Gray Leaf Spot Resistance in Maize by Integrating Conventional Breeding with DNA Marker Technology written by Barnabas Anthony Kiula and published by . This book was released on 2007 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jason Michael David Cromley
Publisher :
ISBN 13 :
Total Pages : 84 pages
Book Rating : 4.:/5 (423 download)
Download or read book Inheritance of Gray Leaf Spot Resistance in Corn written by Jason Michael David Cromley and published by . This book was released on 1999 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: The range of AUDPC values among the parents were 11.4 to 42.9 for B98 and MS 1334, respectively. Generation mean analyses showed significant additive genetic effects, except for B79 x B98, and dominance genetic effects were expressed by all populations. Nonsignificant residuals indicate that epistatic effects were not as important in these populations. A high broad sense heritability estimate of .78 indicates that selection per se within the B79 x B98 population for gray leaf spot resistance should be effective. Resistance to gray leaf spot in the maize genotypes evaluated was conditioned by both additive and dominance effects with the cross B79 x B98 being highly heritable for gray leaf spot resistance.
Author : John Charles Zwonitzer
Publisher :
ISBN 13 :
Total Pages : 177 pages
Book Rating : 4.:/5 (281 download)
Download or read book Genetic Analysis of Southern Leaf Blight, Gray Leaf Spot, and Northern Leaf Blight Resistance Using Near-isogenic Lines and Mapping Populations in Maize written by John Charles Zwonitzer and published by . This book was released on 2008 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: Keywords: southern leaf blight, gray leaf spot, northern leaf blight, quantitative disease resistance, multiple disease resistance, disease resistance quantitative trail loci, near-isogenic lines, maize, recombinant inbred lines.
Author : Jeff L. Bennetzen
Publisher : Springer Science & Business Media
ISBN 13 : 0387794182
Total Pages : 593 pages
Book Rating : 4.3/5 (877 download)
Download or read book Handbook of Maize: Its Biology written by Jeff L. Bennetzen and published by Springer Science & Business Media. This book was released on 2008-12-25 with total page 593 pages. Available in PDF, EPUB and Kindle. Book excerpt: Handbook of Maize: Its Biology centers on the past, present and future of maize as a model for plant science research and crop improvement. The book includes brief, focused chapters from the foremost maize experts and features a succinct collection of informative images representing the maize germplasm collection.
Author : Michael Joe Clements
Publisher :
ISBN 13 :
Total Pages : 82 pages
Book Rating : 4.:/5 (441 download)
Download or read book Quantitative Trait Loci Associated with Resistance to Gray Leaf Spot of Corn written by Michael Joe Clements and published by . This book was released on 1999 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Michele R. Carter
Publisher :
ISBN 13 :
Total Pages : 280 pages
Book Rating : 4.:/5 (263 download)
Download or read book Gray Leaf Spot of Corn written by Michele R. Carter and published by . This book was released on 1992 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Charles Joseph Delp
Publisher : American Phytopathological Society
ISBN 13 :
Total Pages : 148 pages
Book Rating : 4.:/5 (321 download)
Download or read book Fungicide Resistance in North America written by Charles Joseph Delp and published by American Phytopathological Society. This book was released on 1988 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: Overview philosophy; International experiences; Benzimidazole fungicides; Dicarboxide e fungicides; Phenylamide fungicides; Demethylation inhibitor (DMI)fungicides; Companion fungicides; North American goals and their implementation.
Author : Oliver Otis Ott
Publisher :
ISBN 13 :
Total Pages : 91 pages
Book Rating : 4.:/5 (877 download)
Download or read book Screening Teosinte-Maize Introgression Lines for Resistance to Northern Leaf Blight and Gray Leaf Spot Resistance Inheritance and Yield Effects written by Oliver Otis Ott and published by . This book was released on 2013 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Philip Onyimbo Kwena
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (635 download)
Download or read book Recurrent Selection for Gray Leaf Spot (GLS) and Phaeosphaeria Leaf Spot (PLS) Resistance in Four Maize Populations and Heterotic Classification of Maize Germplasm from Western Kenya written by Philip Onyimbo Kwena and published by . This book was released on 2007 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Barnabas Anthony Kiula
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (956 download)
Download or read book Increasing Line Combining Ability and Gray Leaf Spot Resistance in Maize by Integrating Conventional with DNA Marker Technology written by Barnabas Anthony Kiula and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Maize is the staple food for the majority of Tanzanians. However, maize production in the Southern highlands of Tanzania (SHT) is highly reduced by gray leaf spot disease (GLS) caused by the fungus Cercospora zea maydis. GLS reduces grain yield, kernel and silage quality. The most common GLS control methods in Tanzania include amongst others: fungicides, crop rotation, field sanitation, host resistance. These methods except host resistance are, however, either expensive or less effective or unsafe to the environment. Furthermore, conventional breeding strategies are not very effective for traits, which are lowly inherited such as GLS resistance. Lastly, to date there are few GLS resistant commercial hybrids in SHT. Thus, this study aimed to produce more commercial GLS resistant hybrids, increase farmers' hybrid choices of growing genetically different GLS insensitive hybrids, which will also provide a constant supply of GLS resistant maize cultivars in case of GLS resistance breakdown due to new GLS pathotypes. This research combined conventional breeding with molecular technologies to increase the efficacy of selecting GLS resistant hybrids and assist breeders in predicting best inbred combinations for commercial hybrid production. Studies conducted to meet the main aims were on: the prediction of best line combiners and heterosis in Tanzanian maize breeding lines through the use of amplified fragment length polymorphism, (AFLP), an association of AFLPs and the performance of phenotypic traits in maize, evaluation of maize hybrids for gray leaf spot resistance in multienvironments and finally a preliminary study on gray leaf spot PCR-based marker development with the long term objective of implementing cleaved amplified polymorphic markers (CAPS) in a marker assisted selection (MAS) strategy in the SHT maize breeding programme. Results from the study revealed that pairwise GD (genetic distance) of the lines varied from a GD of 0.13 to 0.5. High coancentry coefficients were exhibited by these lines. Joint data analyses showed that there were tighter associations between line GD and F1 traits or MPH in the intergroup than in the intragroup crosses. Combined analyses revealed that hybrids 48, 90 and 45 recorded higher stable yields and consistently low GLS scores in multienvironments. Fifteen CAPS marker bands were identified that are putatively linked to the GLS resistant genes. In summary, it was noted that strong selection during inbreeding programs should be avoided as it reduces germplasm variability. Local landraces/varieties can be improved by introgressing desirable genes into them. AFLP marker system could be effectively used for inbred genetic diversity studies in Tanzania. Intergroup crosses with high GD-MPH should be the main target for commercial hybrid production but field testing of them is inevitable to confirm their yielding potentials. Intergroups and intragroup crosses with low GD-MPH should be discarded to avoid field costs. Better F1 hybrid performance predictions can be achieved by integrating inbred GD and F1 phenotypic data. Hybrids with low GLS/high GLS resistance could be used to produce other breeding populations. Hybrids 45, 48 and 90 can be commercially preleased. Lastly a study to characterize the GLS fungus in the SHT is imperative since information on virulence of isolates is needed for long term breeding strategies against the fungus. Finally, the SHT maize germplasm has potential GLS resistant inbred lines which could be used in the deployment of genes to susceptible lines and in the development of commercial GLS resistant hybrids/open pollinated varieties/doubled haploid hybrids.
