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Genomics of Yams, a Common Source of Food and Medicine in the Tropics

  • Chapter
Genomics of Tropical Crop Plants

Part of the book series: Plant Genetics and Genomics: Crops and Models ((PGG,volume 1))

Abstract

Yams (Dioscorea spp., Dioscoreaceae), grown either for their starchy tubers or medicinal properties, are important crops in the tropics and subtropics. Yams broaden the food base and provide food security and income to over 300 million people. They are vegetatively propagated and comprise both diploid and polyploid species. Despite their economic and socio-cultural importance, very little is known about the genetics and genomics of yams due to research neglect and several biological constraints. Consequently, conventional breeding efforts have been severely hampered. Research to unravel the apparent complexity of the yam genome will have far-reaching implications for genetic improvement of this important tuber crop. Nevertheless, progress has been made recently towards understanding Dioscorea phylogeny and phylogenetic relationships within the genus. Also, improved molecular technologies have been developed for genome analysis, including germplasm characterization, cytogenetics, genetic mapping and tagging, and functional genomics. Genetic linkage maps have been constructed for D. rotundata and D. alata, and quantitative trait loci associated with resistance to Yam mosaic virus in D. rotundata and anthracnose (Colletotrichum gloeosporioides) in D. alata have been identified. In addition, candidate random amplified polymorphic DNA markers associated with major genes controlling resistance to Yam mosaic virus and anthracnose have been identified. These markers could be converted to sequencecharacterized amplified regions and used formarker-assisted selection for resistance to diseases. An initial cDNA library has been constructed to develop expressed sequence tags for gene discovery and as a source of additional molecular markers. Genetic engineering offers a powerful tool, complementing conventional breeding approaches, for yam improvement. Methods for yam transformation, including in vitro plant regeneration, gene delivery, selection of transformed tissues, and recovery of transgenic plants have been developed but still need improvements. This chapter reviews advances made in yam molecular marker development for genome analysis, phylogeny, molecular cytogenetics, characterization of genetic diversity, genetic mapping and tagging, and progress in functional genomics.

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  1. African Agricultural Technology Foundation (AATF), Nairobi, Kenya

    Hodeba D. Mignouna

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  1. Hodeba D. Mignouna
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  1. USDA-ARS, PBARC Hawaii Agriculture Research Center, 99-193 Aiea Heights Drive, Aiea 96701

    Paul H. Moore

  2. Department of Plant Biology, University of lllinois at Urbana-Champaign, 1201 W. Gregory Drive Urbana 61801 288 ERML, MC-051, Champaign, IL, USA

    Ray Ming

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Mignouna, H.D., Abang, M.M., Asiedu, R. (2008). Genomics of Yams, a Common Source of Food and Medicine in the Tropics. In: Moore, P.H., Ming, R. (eds) Genomics of Tropical Crop Plants. Plant Genetics and Genomics: Crops and Models, vol 1. Springer, New York, NY. https://doi.org/10.1007/978-0-387-71219-2_23

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