Florigen

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Florigen is a plant hormone that is triggered by other flowering hormones and initiates the flowering phase .

The existence of such a hormone was postulated in 1936 by Mikhail Christoforowitsch Tschailachjan (Chailakhyan).

properties

Florigen is produced in leaves, depending on the length of the day, and then transported to the tip of the stem axis . In the meantime, the FLOWERING LOCUS T ( FT ) gene has been discovered in Arabidopsis thaliana , which has the suspected properties of Florigen.

Plants register whether it is spring, summer or autumn and when they need to bloom. The most important measured value is the length of the day, which is registered by specialized metabolic cycles in the leaves. If this and the sunshine duration or ambient temperature match the internal specifications, the program for the transition from the vegetative to the generative phase is initiated (a photoperiodism ).

Web links

Individual evidence

  1. ↑ L. Corbesier, G. Coupland: The quest for-pile: a review of recent progress. In: Journal of experimental botany. Volume 57, Number 13, 2006, pp. 3395-3403, ISSN  0022-0957 . doi: 10.1093 / jxb / erl095 . PMID 17030536 . PDF .
  2. ↑ I. Efroni, Y. Eshed, E. Lifshitz: Morphogenesis of simple and compound leaves: a critical review. In: The Plant cell. Volume 22, Number 4, April 2010, pp. 1019-1032, ISSN  1532-298X . doi: 10.1105 / tpc.109.073601 . PMID 20435903 . PMC 2879760 (free full text).
  3. ↑ IG Matsoukas, AJ Massiah, B. Thomas: Florigenic and antiflorigenic signaling in plants. In: Plant & cell physiology. Volume 53, Number 11, November 2012, pp. 1827-1842, ISSN  1471-9053 . doi: 10.1093 / pcp / pcs130 . PMID 23008422 . PDF .
  4. ^ C. Turnbull: Long-distance regulation of flowering time. In: Journal of experimental botany. Volume 62, Number 13, August 2011, pp. 4399-4413, ISSN  1460-2431 . doi: 10.1093 / jxb / err191 . PMID 21778182 . PDF .
  5. ↑ L. Corbesier, C. Vincent, S. Jang, F. Fornara, Q. Fan, I. Searle, A. Giakountis, S. Farrona, L. Gissot, C. Turnbull, G. Coupland: FT protein movement contributes to long-distance signaling in floral induction of Arabidopsis. In: Science. Volume 316, Number 5827, May 2007, pp. 1030-1033, ISSN  1095-9203 . doi: 10.1126 / science.1141752 . PMID 17446353 .
  6. ↑ Detlef Weigel , O. Nilsson: A developmental switch sufficient for flower initiation in diverse plants. In: Nature. Volume 377, Number 6549, October 1995, pp. 495-500, ISSN  0028-0836 . doi: 10.1038 / 377495a0 . PMID 7566146 .
  7. ^ Jiri Petr : Weather and Yield , Developments in Crop Science, Amsterdam, Oxford, New York, Tokyo and Prague 1991. ISBN 0-444-98803-3 .