Clonal integration in Ranunculus reptans : by-product or adaptation?

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2000
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Fischer, Markus
Schmid, Bernhard
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Journal of Evolutionary Biology. 2000, 13(2), pp. 237-248. ISSN 1010-061X. Available under: doi: 10.1046/j.1420-9101.2000.00161.x
Zusammenfassung

We studied fitness consequences of clonal integration in 27 genotypes of the stoloniferous herb Ranunculus reptans in a spatially heterogeneous light environment. We grew 216 pairs of connected ramets (eight per genotype) with mother ramets in light and daughter ramets in shade. In half of the pairs we severed the stolon connection between the two ramets at the beginning of the experiment. During the experiment, 52.7% of the ramet pairs with originally intact connection physically disintegrated. We detected significant variation among genotypes in this regard. Survival of planted ramets was 13.3% higher for originally connected pairs. Moreover, there was significant variation among genotypes in survival, in the difference in survival between plant parts developing from mother and daughter ramets, and in the effect of integration on this difference. In surviving plants connection between ramets decreased size differences between mother and daughter parts. Variation among genotypes was significant in growth and reproduction and marginally significant in the effect of physiological integration on growth and reproduction. Connected daughter ramets had longer leaves and internodes than daughters in severed pairs indicating that integration stimulated plant foraging in both the vertical and the horizontal plane. Observed effects of integration on fitness components in combination with genetic variation in maintenance and effects of connection indicate that clonal integration in R. reptans has the capability to evolve, and therefore suggest that clonal integration is adaptive. If genetic variation in integration is common, future studies on clonal integration should always use defined genetic material and many clones to allow extrapolation of results to population and wider levels.

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570 Biowissenschaften, Biologie
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adaptation, clonal growth, genetic variation, physical integration, physiological integration, Ranunculus reptans, spatial heterogeneity.
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ISO 690VAN KLEUNEN, Mark, Markus FISCHER, Bernhard SCHMID, 2000. Clonal integration in Ranunculus reptans : by-product or adaptation?. In: Journal of Evolutionary Biology. 2000, 13(2), pp. 237-248. ISSN 1010-061X. Available under: doi: 10.1046/j.1420-9101.2000.00161.x
BibTex
@article{vanKleunen2000Clona-12565,
  year={2000},
  doi={10.1046/j.1420-9101.2000.00161.x},
  title={Clonal integration in Ranunculus reptans : by-product or adaptation?},
  number={2},
  volume={13},
  issn={1010-061X},
  journal={Journal of Evolutionary Biology},
  pages={237--248},
  author={van Kleunen, Mark and Fischer, Markus and Schmid, Bernhard}
}
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    <dcterms:abstract xml:lang="eng">We studied fitness consequences of clonal integration in 27 genotypes of the stoloniferous herb Ranunculus reptans in a spatially heterogeneous light environment. We grew 216 pairs of connected ramets (eight per genotype) with mother ramets in light and daughter ramets in shade. In half of the pairs we severed the stolon connection between the two ramets at the beginning of the experiment. During the experiment, 52.7% of the ramet pairs with originally intact connection physically disintegrated. We detected significant variation among genotypes in this regard. Survival of planted ramets was 13.3% higher for originally connected pairs. Moreover, there was significant variation among genotypes in survival, in the difference in survival between plant parts developing from mother and daughter ramets, and in the effect of integration on this difference. In surviving plants connection between ramets decreased size differences between mother and daughter parts. Variation among genotypes was significant in growth and reproduction and marginally significant in the effect of physiological integration on growth and reproduction. Connected daughter ramets had longer leaves and internodes than daughters in severed pairs indicating that integration stimulated plant foraging in both the vertical and the horizontal plane. Observed effects of integration on fitness components in combination with genetic variation in maintenance and effects of connection indicate that clonal integration in R. reptans has the capability to evolve, and therefore suggest that clonal integration is adaptive. If genetic variation in integration is common, future studies on clonal integration should always use defined genetic material and many clones to allow extrapolation of results to population and wider levels.</dcterms:abstract>
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