Original Research

A few aspects of the physiology of flowering in photoperiodic sensitive plants

E. G. Groenewald, A. J. van der Westhuizen
Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie | Vol 22, No 1 | a204 | DOI: https://doi.org/10.4102/satnt.v22i1.204 | © 2003 E. G. Groenewald, A. J. van der Westhuizen | This work is licensed under CC Attribution 4.0
Submitted: 26 September 2003 | Published: 26 September 2003

About the author(s)

E. G. Groenewald, Plantkunde, Universiteit van die Vrystaat, South Africa
A. J. van der Westhuizen, Plantkunde, Universiteit van die Vrystaat, South Africa

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Abstract

Three aspects of the physiology of flowering in photoperiodic sensitive plants are discussed. These are the florigen hypothesis, phytochrome and the time measurement mechanism of flowering and genetic-molecular studies involved in flowering. There is evidence that the hypothetical compound, florigen, occurs in plants, but it has never been characterised. There is a family of phytochromes discovered in plants and some of them are involved with the circadian clock and thus with the time measurement mechanism of flowering. The molecular networks that interact to control flowering are being elucidated, by means of genetic-molecular techniques although at an early stage. It has not yet been possible to pinpoint florigen by these methods, but the future looks promising.


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