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Chapitre D'ouvrage Année : 2010

Plant quantitative traits

Sobia Ikram
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Fabien Chardon

Résumé

In plants, most of the phenotypic variations are continuously distributed and could be considered as quantitative traits. The complexity of their genetic control is high because the involved genes are numerous, with usually minor effects and very sensitive to environment. The implicated loci are localised by two basic approaches, linkage mapping and association mapping, based on the use of genetic maps and sophisticated statistical analysis. Linkage mapping leads to the identification of small regions of genome but that could contain still several hundred genes. Identification of gene underlying the quantitative trait loci requires positional cloning or direct tests of promising candidates. Association mapping checks directly the relationship between each polymorphism and phenotypic trait variation in wild populations, but physical linkage and population structure are sources of false positives. Finally, validation that an individual gene is responsible for the quantitative trait needs to be performed by using genetic or functional complementation.
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Dates et versions

hal-01203948 , version 1 (23-09-2015)

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Sobia Ikram, Fabien Chardon. Plant quantitative traits. Plant Quantitative Traits, Wiley Online Library, 2010, ⟨10.1002/9780470015902.a0002021.pub2⟩. ⟨hal-01203948⟩
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