Growth rings in the roots of temperate forbs are robust annual markers.

@article{vonArx2006GrowthRI,
  title={Growth rings in the roots of temperate forbs are robust annual markers.},
  author={Georg von Arx and Hansjoerg Dietz},
  journal={Plant biology},
  year={2006},
  volume={8 2},
  pages={
          224-33
        }
}
There is increasing interest in the analysis of annual growth rings in the secondary root xylem of perennial forbs (herb-chronology). Therefore, we need to verify whether these growth rings are always formed annually. To investigate the formation of root rings we performed common garden experiments at two distinct sites in Switzerland. We grew nine unrelated forb species from seed and subjected them to competition and clipping treatments. Anatomical developments in the roots of the individuals… 

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