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  • Phenotypic plasticity of invasive Alternanthera philoxeroides in relation to different water availability, compared to its native congener

    Author(s)
    Geng, Yu-Peng
    Pan, Xiao-Yun
    Xu, Cheng-Yuan
    Zhang, Wen-Ju
    Li, Bo
    Chen, Jia-Kuan
    Griffith University Author(s)
    Xu, Chengyuan
    Year published
    2006
    Metadata
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    Abstract
    Phenotypic plasticity and genetic differentiation are two possible mechanisms that plants use to cope with varying environments. Although alligator weed (Alternanthera philoxeroides) possesses very low genetic diversity, this alien weed has successfully invaded diverse habitats with considerably varying water availability (from swamps to dry lands) in China. In contrast, its native congener (Alternanthera sessilis) has a much narrower ecological breadth, and is usually found in moist habitats. To understand the mechanisms underlying the contrasting pattern, we performed a greenhouse experiment to compare the reaction norms ...
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    Phenotypic plasticity and genetic differentiation are two possible mechanisms that plants use to cope with varying environments. Although alligator weed (Alternanthera philoxeroides) possesses very low genetic diversity, this alien weed has successfully invaded diverse habitats with considerably varying water availability (from swamps to dry lands) in China. In contrast, its native congener (Alternanthera sessilis) has a much narrower ecological breadth, and is usually found in moist habitats. To understand the mechanisms underlying the contrasting pattern, we performed a greenhouse experiment to compare the reaction norms of alligator weed with those of its native congener, in which water availability was manipulated. Our results revealed that the two congeners had similar direction of phenotypic plasticity. However, A. philoxeroides showed greater plasticity in amount than did A. sessilis in many traits examined during the switch from wet to drought treatment. Nearly all of the phenotypic variance in A. philoxeroides could be ascribed to plasticity, while A. sessilis had a much higher fraction of phenotypic variance that could be explained by genotypic variation. These interspecific differences in plastic responses to variable water availability partially explained the difference in spatial distribution of the two congeners.
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    Journal Title
    Acta Oecologica
    Volume
    30
    Issue
    3
    DOI
    https://doi.org/10.1016/j.actao.2006.07.002
    Subject
    Ecology
    Ecology not elsewhere classified
    Publication URI
    http://hdl.handle.net/10072/57964
    Collection
    • Journal articles

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