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Position of tillers in a clone determines their ontogeny: example of the clonal grass Phalaris arundinacea

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Abstract

For practical reasons, all ramets of a clonal plant are considered to be independent individuals in demographical studies, but there are reports that ramet ontogeny is affected by their position in a clone. This means that ramets growing from buds located in certain parts of the rhizome system differ in size and probability of flowering from ramets emerging from buds at various positions. We studied the growth characteristics and ontogeny of tillers (ramets) of a rhizomatous grass in relation to their position in a clone and examined whether it is affected by the disturbance regime. We assessed the position of tillers in a clone, the developmental stage of their apical meristem and growth characteristics in mown and unmown stands of the rhizomatous grass Phalaris arundinacea at two sites, one representing optimal (lowland) and the other suboptimal (highland) environmental conditions. We found that tiller characteristics and the probability of a tiller to start flowering are related to the tiller position in a clone. Tiller differences were preserved even in suboptimal environmental conditions but disappeared after mowing, which equalized size and ontogeny. Our results imply that ramets of clonal plants are not independent demographical units, thus their position in a clone should be taken into account.

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Acknowledgements

This study was supported by the Grant Agency of the Czech Republic (PLADIAS Centre of Excellence 14 – 36079G). We are indebted to Jan W. Jongepier for his linguistic help and Ondřej Mudrák for statistical advice.

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Correspondence to Jana Martínková.

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Martínková, J., Klimešová, J. Position of tillers in a clone determines their ontogeny: example of the clonal grass Phalaris arundinacea . Folia Geobot 52, 317–325 (2017). https://doi.org/10.1007/s12224-016-9277-5

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  • DOI: https://doi.org/10.1007/s12224-016-9277-5

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