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    The Genetics of Phenotypic Plasticity in Plant Defense: Trichome Production in Mimulus guttatus

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    Issue Date
    2010-04-04
    Author
    Holeski, Liza M.
    Chase‐Alone, Ronnette
    Kelley, John K.
    Publisher
    University of Chicago Press
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
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    Abstract
    Insect herbivory is a major driving force of plant evolution. Phenotypic plasticity and developmental variation provide a means for plants to cope with variable herbivory. We characterized the genetics of developmental variation and phenotypic plasticity in trichome density, a putative defensive trait of Mimulus guttatus (yellow monkeyflower). Our results are evaluated in relation to the optimal defense theory, which provides testable predictions for plastic and developmental patterns in defense traits. We found that both developmental stage and simulated insect damage affected trichome production, but in different ways. Plants were more likely to produce at least some trichomes on later leaves than on earlier leaves, regardless of damage. Damage did not affect the average probability of producing trichomes, but it did increase the density of hairs on trichome‐positive plants. We mapped trichome quantitative trait loci (QTL) by selectively genotyping a large panel of recombinant inbred lines derived from two highly divergent populations. Several highly pleiotropic QTL influenced multiple aspects of the trichome phenotype (constitutive, developmental, and/or plastic responses). Only one of the QTL influenced trichome induction following damage. In a result that is consistent with a central prediction of optimal defense theory, the high allele at this location was from the ancestral population with low constitutive trichome production.
    Description
    This is the publisher's version, also available electronically from http://www.jstor.org/stable/10.1086/651300#fn1.
    URI
    http://hdl.handle.net/1808/13337
    DOI
    https://doi.org/10.1086/651300
    ISSN
    0003-0147
    Collections
    • Ecology & Evolutionary Biology Scholarly Works [1516]
    Citation
    Liza M. Holeski, Ronnette Chase‐Alone, and John K. Kelly. 2010. The Genetics of Phenotypic Plasticity in Plant Defense: Trichome Production in Mimulus guttatus. The American Naturalist , 175(4):391-400. http://dx.doi.org/10.1086/651300

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    KU Libraries
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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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