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“A SELF-ORGANIZED MOLECULAR NETWORK CONTROLLING THE DYNAMICS OF ROOT GROWTH AND DEVELOPMENT“

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Monday 13 January 2020, 11:00 - 12:30

 
ABSTRACT

During organogenesis different regulatory networks need to be coordinated to guarantee coherent organ growth. In the plant Arabidopsis thaliana, growth of the root organ depends on meristem activity. Many molecular mechanisms have been identified involved in patterning different meristematic zones but how they are coordinately orchestrated to control meristem growth activation, expansion and subsequent stabilization is largely unknown. By combining molecular genetics with computational modeling we identify the layout of an Auxin-PLETHORA-Cytokinin regulatory network responsible for these patterning processes. We show that upon seed germination, an ARR12/PLT2/auxin module is responsible for controlled root meristem growth while an ARR1/KRP2/PLT/auxin module sets final meristem size and thus determines the final rate of root growth. We also show that the auxin-PLT-ARR interaction network is a self-organized pattern generator that positions and maintains, in the developing root, the transition zone thus partitioning cell division (dependent on auxin and PLT) and differentiation (dependent on ARR1, ARR12) activities.

 

 

Location Jozef Schell Seminar Room
Contact Dr Sabrina Sabatini
Department of Molecular Biology and Biotechnology
Sapienza University of Rome
ITALY