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Kinetics Studies on the Photoinduction of Xanthium strumarium L. and Isolation of a Flower Primordia Growth-Regulating Fractionl |
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| Authors: | Pare, J. R. Jocelyn Apsimson, John W. Wightman, Frank |
| Affiliation: | 2Agriculture Canada, Centre de Recherche et de Development sur les Aliments 3600 boul. Casavant ouest, Saint-Hyacinthe, Quebec, Canada J2S 8E3 3Department of Chemistry, Carleton University Ottawa, Ontario, Canada K1S 5B6 4Department of Biology, Carleton University Ottawa, Ontario, Canada KIS 5B6 |
| Abstract: | The kinetics of flower primordia formation have been re-examinedin photoinduced Xanthium strumarium L. to determine the numberof short-day treatments that promote optimum primordia initiationand development. Plants given 4 short-day cycles showed thehighest rate of primordia development. Attempts were made toisolate flower-promoting substance(s) from the young leavesof such optimally induced plants by methanol extraction followedby ether fractionation. A Xanthium bioassay was developed fortesting the flower-promoting activity of aqueous concentratesobtained from the acidic, neutral-basic and total ether extracts.No flower-primordia inducing activity was found in any of thefractions, but growth-accelerating activity on young primordiawas shown by substance(s) present in the combined neutral-basicfraction isolated from photoinduced leaves. 1C.R.D.A. Contribution No. 170. (Received June 14, 1989; Accepted September 20, 1989) |
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