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Both physiological and genetic results support the theory of a multifactorial control …

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- Physiological Signals That lnduce Flowering


The challenge for plants, which are sessile organisms, is to reproduce successfully in an often unpredictable environment. Clearly, we are only now having a first glimpse of the real complexity of the control of their transition to flowering. Further progress will require an integrated combination of approaches: a physiological dissection of the process at the whole-plant leve1 and a genetic and molecular dissection at lower levels of organization. As we learn more about flowering, we shall progressively discover that plants have evolved an incredibly sophisticated machinery for controlling their entry into sexual reproduction.


We are indebted to Drs. Chris R. Somerville and Caroline Dean for supplies of the starch mutants of Arabidopsis and to Mr. Georges Sylvestre for excellent technical assistance. DL-a-difluoromethylornithine was a gift of Marion Merrell Dow. This work was supported by grants from University of Libge (Action de Recherche ConcertBe, No. 88/93-129), Fonds de Ia Recherche Fondamentale et Collective (No. 2.9009.87 and No. 2.4529-92), and RBgion Wallonne (No. 2100). C.H. and RL. were fellows of lnstitut pour IEncouragement de ta Recherche ScientiRque dans I'lndustrie et I'Agriculture during part of this work.

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