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Genetics of Adaptation pp 75–85Cite as

Ontogenetics of QTL: the genetic architecture of trichome density over time in Arabidopsis thaliana

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Part of the Georgia Genetics Review III book series (GEGR,volume 3)

Abstract

Although much is known about the molecular genetic basis of trichome development in Arabidopsis thaliana, less is known about the underlying genetic basis of continuous variation in a trait known to be of adaptive importance: trichome density. The density of leaf trichomes is known to be a major determinant of herbivore damage in natural populations of A. thaliana and herbivores are a significant selective force on genetic variation for trichome density. A number of developmental changes occur during ontogeny in A. thaliana, including changes in trichome density. I used multiple interval mapping (MIM) analysis to identify QTL responsible for trichome density on both juvenile leaves and adult leaves in replicate, independent trials and asked whether those QTL changed with ontogeny. In both juvenile and adult leaves, I detected a single major QTL on chromosome 2 that explained much of the genetic variance. Although additional QTL were detected, there were no consistent differences in the genetic architecture of trichome density measured on juvenile and adult leaves. The finding of a single QTL of major effect for a trait of known adaptive importance suggests that genes of major effect may play an important role in adaptation.

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  1. Department of Genetics, University of Georgia, Athens, GA, 30602, USA

    Rodney Mauricio

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Mauricio, R. (2005). Ontogenetics of QTL: the genetic architecture of trichome density over time in Arabidopsis thaliana. In: Mauricio, R. (eds) Genetics of Adaptation. Georgia Genetics Review III, vol 3. Springer, Dordrecht. https://doi.org/10.1007/1-4020-3836-4_8

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