Gibberellins and Inhibitors in Relation to Flowering of White Clovers (Trifolium repens L.)

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Abstract
Flower primordia appeared sooner and flowering intensity increased as day length was extended beyond 8 h (short day) in two white clovers: cv. Tamar and cv. Tammisto, originating from Israel and Finland, respectively. Application of GA3 under short days caused Tamar to flower more intensively as much as the dose of GA3 was increased, but it did not affect the flowering of Tammisto. The level of gibberellin-like substances in stolon apices was higher under long (16 h) than under short days in both cultivars. The level of inhibitors extracted from leaves was not affected by day length in Tamar. However, in Tammisto this level was almost twice as high under short than under long days. It is suggested that the presence of a relatively high level of inhibitors in Tammisto when grown under short days interfered with the activity of gibberellins in its effect on flowering. ABA was among the inhibitors: its application under long days had no effect on flowering, but it increased the number of stolons. Possibly inhibitors other than ABA are involved in the prevention of flowering. Leaf expansion responded to day length and GA3 and ABA application in a similar way as the response of flowering, i.e. towards flowering the size of the leaves increased.

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