Regulation of spiral phyllotaxis in flowering plants

Banić, Elizabeta (2014) Regulation of spiral phyllotaxis in flowering plants. Bachelor's thesis, Faculty of Science > Department of Biology.

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Abstract

Regular positioning of plant organs around stem, called phyllotaxis, has fascinated both biologists and mathematicians for centuries. Model species A. thaliana is most used as model for phyllotaxis research. Phillotaxis is determined most importantly by pattern of auxin maxima in outer layer of shoot apical meristem, which positions leaf or flower primordia. Auxin maxima define the location of primordia initiation, and surrounding auxin minima act as inhibitory fields, preventing primordia initiation. Feedback loop between auxin and its polar exporter PIN1 is sufficient to establish auxin gradients. Symmetrically distributed auxin influx carriers AUX1 and LAX are needed to stabilize this pattern, concentrating auxin on meristem surface. Synthesis of auxin in meristem is regulated by plethora transcription factors. Regulating activities of pectin methyl-esterases and their inhibitors plays a role in modulating cell wall mechanics, which influences phyllotaxsis. Defining meristem boundary by CUC2 and miR164 is needed for post-meristematic maintaining of phyllotaxis in fully grown stem.

Item Type: Thesis (Bachelor's thesis)
Supervisor: Leljak Levanić, Dunja
Date: 2014
Number of Pages: 10
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Silvana Šehić
Date Deposited: 18 Nov 2014 10:12
Last Modified: 18 Nov 2014 10:12
URI: http://digre.pmf.unizg.hr/id/eprint/3293

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