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Genetics and Genomics of Carrot Biotic Stress

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The Carrot Genome

Part of the book series: Compendium of Plant Genomes ((CPG))

Abstract

Carrot (Daucus carota ssp. sativus) production can be affected by a wide range of pests and pathogens. At least five diseases of carrot are caused by bacterial pathogens, 36 by fungal and oomycete pathogens, two by phytoplasmas, and 13 by viruses; and seven genera of nematodes and two genera of parasitic plants affect carrot. In addition, numerous insect and mite pests can cause losses. There have been extensive efforts to select carrot cultivars with partial or complete resistance to many of these pathogens and pests, and to identify wild species with resistance to specific biotic stresses for introgression into breeding populations and commercial cultivars. For some pathogens and pests, significant advances have been made at identifying resistance and mapping that resistance to the carrot genome. For others, resistance has been identified, but the genetic basis is yet to be determined. For a majority of these diverse stresses, however, there has been little success at identifying highly effective resistance and understanding the genetic basis of resistance. The diversity of stresses as well as interactions among these pests and pathogens can complicate efforts to develop cultivars with resistance to all key biotic stresses in a region that also meet market and consumer expectations. New approaches to identifying resistant material and speeding traditional breeding are being developed with molecular breeding tools, including simple sequence repeat markers and deep-coverage libraries of the carrot genome. These valuable genomic resources will enhance efforts to identify and breed for resistance to carrot pests and pathogens.

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Authors and Affiliations

  1. Department of Plant Pathology, Washington State University Mount Vernon NWREC, Mount Vernon, WA, 98273, USA

    Lindsey J. du Toit

  2. IRHS, Agrocampus Ouest, INRA, Université d’Angers, SFR QuaSaV, Angers, 49045, France

    Valérie Le Clerc & Mathilde Briard

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  1. Lindsey J. du Toit
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  2. Valérie Le Clerc
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Correspondence to Lindsey J. du Toit .

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  1. Vegetable Crops Research Unit, USDA-ARS, Madison, WI, USA

    Philipp Simon

  2. Plants for Human Health Institute, North Carolina State University , Kannapolis, NC, USA

    Massimo Iorizzo

  3. University of Agriculture in Krakow, Krakow, Poland

    Dariusz Grzebelus

  4. Faculty of Biotechnology and Horticulture, University of Agriculture in Krakow, Krakow, Poland

    Rafal Baranski

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du Toit, L.J., Le Clerc, V., Briard, M. (2019). Genetics and Genomics of Carrot Biotic Stress. In: Simon, P., Iorizzo, M., Grzebelus, D., Baranski, R. (eds) The Carrot Genome. Compendium of Plant Genomes. Springer, Cham. https://doi.org/10.1007/978-3-030-03389-7_18

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