Developmental and Structural Section
Zagorska-Marek, Beata .
The diversity of magnolia phyllotaxis in vivo and in silico.
It is proposed, that in magnolia, the double change in the identity of floral organ primordia, associated with the change in their sizes, creates the potential for the diversity of floral phyllotaxis. Yet, various magnolia species, or even genets, execute this potential in many different ways. Some have an exceptionally rich, others a quite limited spectrum of the diversity in a population of floral ramets. Magnolia individuals often exhibit preferences in the formation of one particular pattern. This one pattern, dominant in the spectrum, together with other patterns' distribution, creates a special, characteristic “phyllotactic fingerprint” of the genet. The fingerprint may either be maintained throughout a period of many years, or slowly drift toward another pattern’s dominance. Can the change in the size of floral primordia alone be responsible for all these phenomena, especially for ontogenetic transitions accomplished through dislocations in the phyllotactic lattice? A geometric model of phyllotaxis and a special computer program have been used for testing the allowances and limits in the shoot apical meristem’s organogenic function, with the hope of providing answers to this question. The results of computer simulations will be confronted with the frequencies of real patterns and transitions observed in magnolias. Justification of some patterns' dominance over others will be provided.
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1 - Wroclaw University, Institute of Plant Biology, Kanonia Str. 6/8, Wroclaw, 50-328, Poland
shoot apical meristem.
Presentation Type: Oral Paper:Papers for Sections
Date: Monday, July 28th, 2008
Time: 10:30 AM