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Lactuca

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Wild Crop Relatives: Genomic and Breeding Resources

Abstract

Lettuce (Lactuca sativa) is cultivated extensively as a salad crop. Germplasm collections of wild and cultivated Lactuca species are important resources of biodiverse genetic material for plant breeding, with accurate details of the origin and characteristics of such material being essential. Lettuce has been crossed sexually with several wild species with the aim of introgressing genes, such as those for virus and fungal resistance, into the cultivated crop. Current molecular techniques play a key role at the nuclear and organelle levels to identify the most relevant germplasm, with its agronomically important genes, for incorporation into breeding programs. Somatic cell approaches that center upon robust plant regeneration systems from cells and tissues provide a basis for exposure of somaclonal variation and the generation of transgenic and somatic hybrid and cybrid plants. Transformation procedures, especially using Agrobacterium to introduce genes into target cultivars of lettuce, have enabled a range of genetic characteristics to be expressed in lettuce, especially genes for improved nutrition, human health and agronomic performance. Consideration needs to be given to the release of genes from the cultivated lettuce into wild species, with modeling experiments being relevant to predict gene flow. Future demand for leafy vegetables will necessitate ongoing genetic manipulation of lettuce through integration of conventional breeding, somatic cell approaches and molecular technologies.

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  1. Plant and Crop Sciences Division, School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough, LE12 5RD, UK

    Michael R. Davey & Paul Anthony

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  1. Michael R. Davey
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  2. Paul Anthony
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Correspondence to Michael R. Davey .

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  1. Institute of Nutraceutical Research, Clemson University, Jordan Hall 109, Clemson, 29634, South Carolina, USA

    Chittaranjan Kole

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Davey, M.R., Anthony, P. (2011). Lactuca. In: Kole, C. (eds) Wild Crop Relatives: Genomic and Breeding Resources. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-20450-0_8

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