Abstract
The kinetics of flower primordia formation have been re-examined in photoinduced Xanthium strumarium L. to determine the number of short-day treatments that promote optimum primordia initiation and development. Plants given 4 short-day cycles showed the highest rate of primordia development. Attempts were made to isolate flower-promoting substance(s) from the young leaves of such optimally induced plants by methanol extraction followed by ether fractionation. A Xanthium bioassay was developed for testing the flower-promoting activity of aqueous concentrates obtained from the acidic, neutral-basic and total ether extracts. No flower-primordia inducing activity was found in any of the fractions, but growth-accelerating activity on young primordia was shown by substance(s) present in the combined neutral-basic fraction isolated from photoinduced leaves.
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