Seasonal variation in stolon growing point density of a world collection of white clover (Trifolium repensL.) cultivars

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Abstract
The seasonal variation in density of aerial and surface stolon growing points of 109 cultivars and 16 breeding lines of white clover was examined in a rotationally grazed sward over 3 years. Aerial and surface stolon growing points numbers were higher in summer and autumn than in winter and spring. There was, however, a large cultivar × season interaction for stolon growing point density. Very small-leaved cultivars had a greater change in stolon growingpoint density from summer orautumn to winter or spring than larger-leaved cultivars. Earlier-flowering Unes also had a more significant seasonal drop in stolon growing point density from autumn to winter or spring than later-flowering lines.