In both short-day and long-day plants, endogenous rhythms apparently are involved in photoperiodic response. One line of the evidence is a rhythmic flowering response to cycle length (1, 3,4,6,9), and another is the rhythmic effectiveness of light breaks given at different points in very long dark periods (2,4,6,8,10).Phlarbitis nil, strain Violet, is an extremely sensitive short-day plant. A
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