SITES OF PHOTOPERCEPTION IN WHITE CLOVER

White clover (Trifolium repens) grows both horizontally, via the stole n, and vertically, via the petiole, through its environment. Comparing the effects of clear and opaque paint allowed the localization of two photoperceptive sites. Stolen growth (horizontal) was altered by the radiation environment at the node, and petiole growth (vertical) by ra diation perceived at the petiole tip. Photoperception at these two sit es provides a mechanism by which the plant can direct its growth to ex ploit its environment maximally.