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Local Differentiation for Phenotypic Plasticity in the Annual Collomia linearis (Polemoniaceae)

Dieter H. Wilken
Systematic Botany
Vol. 2, No. 2 (Summer, 1977), pp. 99-108
DOI: 10.2307/2418577
Stable URL: http://www.jstor.org/stable/2418577
Page Count: 10
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Local Differentiation for Phenotypic Plasticity in the Annual Collomia linearis (Polemoniaceae)
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Abstract

A population of Collomia linearis was subdivided into two plots, one in a relatively disturbed site free from interspecific competition and the other in a meadow habitat characterized by high vegetative cover and considerable interspecific competition. Greenhouse progenies of the two subpopulations differed significantly with respect to seven morphological characters, indicating that the two subpopulations were genetically differentiated. Analysis of nine morphological characters in progenies subjected to 36 different environmental conditions revealed that plants of the disturbed plot were phenotypically more plastic than those of the meadow plot. It is concluded that phenotypic plasticity represents a genetic response and may arise through local differentiation under conditions of disruptive selection.

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