Correlations Among Resistances to Six Diseases of Alfalfa, and Progress from Selection for Resistance to Root and Crown Rot Caused by Three Fusarium Species PDF Download
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Author: Jill Elizabeth Miller-Garvin
Publisher:
ISBN:
Category :
Languages : en
Pages : 170
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Author: Jill Elizabeth Miller-Garvin
Publisher:
ISBN:
Category :
Languages : en
Pages : 170
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Author:
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ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 752
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Author:
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Category : Plant breeding
Languages : en
Pages : 1238
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Author: Jennifer J. Ariss
Publisher:
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Category : Alfalfa
Languages : en
Pages :
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Abstract: Enhanced disease resistance to lethal pathogens may contribute to increased individual plant survival and long-term persistence of alfalfa stands. In order to investigate the effect of disease on alfalfa persistence, experiments were undertaken to examine the role of lethal and chronic fungal pathogens on alfalfa. Disease incidence and severity data were recorded over six years on sixteen cultivars representing six decades of cultivar improvement. The major diseases present considered to be limiting to plant survival were Fusarium wilt (FW) and anthracnose. Disease incidence over the six years for both diseases was highest in cultivars released prior to 1980. In the fourth year, a sample of surviving plants from six cultivars were selected from the field study, established in the greenhouse and randomly intermated, creating six new populations. Progeny of the populations that had undergone one cycle of field selection were tested against the progeny of the same unselected plant material as was planted at the field site. Percent of resistant individuals for FW and anthracnose was higher in the populations that underwent field selection than the corresponding parent material. These results provide evidence that the survivors possessed resistance to the lethal diseases present. During the previous study, an isolate of Colletotrichum trifolii was identified in modern cultivars with high resistance to anthracnose. This isolate, designated OH-WA-520, was retained for further studies to determine the isolate's race. Results of these studies show a reaction inconsistent with C. trifolii race 1 or race 2. Previous studies in Australia have shown similar results and have termed these isolates C. trifolii race 4. This is the first reported isolate consistent with C. trifolii race 4 in the US. One documented chronic disease is Fusarium crown rot (FCR), caused by the infection of cortical-rotting Fusarium species. While no commercial cultivars are specifically marketed for FCR resistance, grazing-tolerant cultivars are thought to be less affected. To assess resistance in modern cultivars, a greenhouse trial was conducted. The results of this study provide evidence that differences in FCR resistance exist in modern cultivars and agronomic type does not inherently contribute to FCR resistance.
Author: Sukumar Chakraborty
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 676
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Author:
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Category : Dissertation abstracts
Languages : en
Pages : 796
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Author:
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ISBN:
Category : Agriculture
Languages : en
Pages : 212
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Includes abstracts of the annual meetings of the American Society of Agronomy; Soil Science Society of America; Crop Science Society of America ( - of its Agronomic Education Division).
Author:
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Category : Agriculture
Languages : en
Pages : 1920
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Author: Steve B. Orloff
Publisher: UCANR Publications
ISBN: 9781879906242
Category : Technology & Engineering
Languages : en
Pages : 152
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Book Description
This comprehensive guide for western alfalfa growers brings together the most current information and recommendations in nearly all areas of alfalfa management, including stand establishment, fertilization, irrigation, pest management, and harvesting
Author: Frédérique Van Gijsegem
Publisher: Springer Nature
ISBN: 303061459X
Category : Science
Languages : en
Pages : 298
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Book Description
This book provides a detailed review of many different aspects of pathogens, from the effects of single base pair mutations to large-scale control options, bringing into a single volume over 100 years of findings from thousands of researchers worldwide. Diseases caused by soft rot Pectobacteriaceae (SRP) are a major cause of loss to crop, vegetables and ornamental plants worldwide, and have been found on all continents except Antarctica. While different aspects of the SRP have appeared in other books on plant disease, no book, until now, has been dedicated solely to them.
