The significance of nodal rooting in Trifolium repens L.: P distribution and local growth responses.

The distribution of P from single nodal roots, and the consequences of nodal rooting on local growth characteristics were investigated in order to evaluate the importance of nodal rooting in Trifolium repens. The movement of radiophosphate was mostly acropetal, and the principal sinks were the closest components to the supplied root. The branch stolon originating from the same node as the root was the mast significant sink, and its importance as sink increased the older and larger it became. Nodal rooting on the main stolon resulted in a localized increase in secondary branching on the primary branch originating from the same node. The results are discussed in terms of physiological integration in T. repens and other clonal plants.