Author: George Edward Boyhan
Publisher:
ISBN:
Category : Watermelons
Languages : en
Pages : 118

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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Watermelon (Citrullus lanatus (Thunb.) Matsum. & Nakai) is a major crop in the southern United States. Papaya ringspot virus-watermelon strain (PRSV-W, formerly Watermelon mosaic virus-1) and Zucchini yellow mosaic virus (ZYMV) affect all agricultural species of the Cucurbitaceae and are of great economic importance because of their destructiveness. Watermelon has not been screened extensively for resistance to PRSV-W. Although there is a resistance source for ZYMV resistance, the identification of additional sources of resistance to ZYMV would be highly desirable since the initial sources of resistance are temperature dependent, or not resistant to some of the more severe strains of the virus. The objectives of this study were 1) to screen the USDA watermelon germplasm collection along with available watermelon cultivars for PRSV-W resistance; 2) to verify the disease rating for the most resistant and most susceptible accessions; 3) to determine the genetic control of PRSV-W resistance; and 4) to screen the U.S.D.A. watermelon germplasm collection along with available watermelon cultivars to identify additional sources of resistance to ZYMV. A total of 1275 plant introduction accessions and 44 watermelon cultivars were screened for PRSV-W resistance. The experiment was a randomized complete block with five replications. Enzyme-linked immunosorbent assay (ELISA) was performed after the last rating to determine whether the virus was in the plant tissue. After the germplasm screening, the most resistant and most susceptible cultigens were retested to verify their reactions. Of the 60 resistant PI accessions in the final retest, eight had resistance with a rating of 3.6 or less for the best, average and maximum ratings: PI 244017, PI 244019, PI 482342, PI 482318, PI 485583, PI 482379, PI 595203, and PI 244018. None of the watermelon cultivars tested exhibited resistance to PRSV-W. Inheritance of PRSV-W resistance was studied in three C. lanatus var. citroides acces.

Author:
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 20

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Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 858

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Author:
Publisher:
ISBN:
Category : Dissertation abstracts
Languages : en
Pages : 800

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Author: A.G. Gillaspie
Publisher:
ISBN:
Category : Watermelons
Languages : en
Pages :

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Author: Rebecca Grumet
Publisher: Springer
ISBN: 3319493329
Category : Science
Languages : en
Pages : 434

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This book provides an overview of the current state of knowledge of the genetics and genomics of the agriculturally important Cucurbitaceae plant family, which includes crops such as watermelon, melon, cucumber, summer and winter squashes, pumpkins, and gourds. Recent years have resulted in tremendous increases in our knowledge of these species due to large scale genomic and transcriptomic studies and production of draft genomes for the four major species, Citrullus lanatus, Cucumis melo, Cucumis sativus, and Cucurbita spp. This text examines genetic resources and structural and functional genomics for each species group and across species groups. In addition, it explores genomic-informed understanding and commonalities in cucurbit biology with respect to vegetative growth, floral development and sex expression, fruit growth and development, and important fruit quality traits.

Author: Roberto Fritsche-Neto
Publisher: Springer Science & Business Media
ISBN: 364233086X
Category : Science
Languages : en
Pages : 166

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Experience shows that biotic stresses occur with different levels of intensity in nearly all agricultural areas around the world. The occurrence of insects, weeds and diseases caused by fungi, bacteria or viruses may not be relevant in a specific year but they usually harm yield in most years. Global warming has shifted the paradigm of biotic stresses in most growing areas, especially in the tropical countries, sparking intense discussions in scientific forums. This book was written with the idea of collecting in a single publication the most recent advances and discoveries concerning breeding for biotic stresses, covering all major classes of biotic challenges to agriculture and food production. Accordingly, it presents the state-of-the-art in plant stresses caused by all microorganisms, weeds and insects and how to breed for them. Complementing Plant Breeding for Abiotic Stress Tolerance, this book was written for scientists and students interested in learning how to breed for biotic stress scenarios, allowing them to develop a greater understanding of the basic mechanisms of resistance to biotic stresses and develop resistant cultivars.

Author: Ian S. Curtis
Publisher: Springer Science & Business Media
ISBN: 1402023332
Category : Technology & Engineering
Languages : en
Pages : 448

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Since the first transgenic plants were produced back in the early 1980s, there have been substantial developments towards the genetic engineering of most crops of our world. Initial studies using isolated plant cells and removing their cell walls to form protoplasts, offered the possibility of transferring genetic material by Agrobacterium-mediated gene transfer, chemical agents or electrical charges. However, in those cases were isolated protoplasts could be transformed, often, a shoot regeneration system was not available to induce the production of transgenic plants and any such regenerated plants were subject to mutation or chromosomal of cultured plant organs, such as leaf abnormalities. By the mid-1980s, the use disks, offered the convenience of combining gene transfer, plant regeneration and selection of transformants in a single system. This approach, enabled the production of stable, phenotypically-normal, transgenic potato and tomato plants in culture. By the late 1980s, the use of biolistics offered a means of inserting foreign genes into plant cells which where inaccessible to Agrobacterium infection. Even today, this technology is now standard practice for the production of some transgenic plants.

Author: Zakiah Muhamad Mokhni
Publisher:
ISBN:
Category :
Languages : en
Pages : 126

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