EEB340H1 Lecture 11: EEB340 Lecture 11.docx
10 Apr 2012
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Document Summary
Hdzip in the peripheral zone there is a max of auxin where leaf primordia develop. Pin proteins can control localized concentrations of auxin by transport. Very low levels of auxin in algae. Algae: auxin transport: no polar transport, efflux and influx carriers, no studies on pin in the direct algal ancestors. Hornworts and liverworts: auxin present, no polar transport rather, movement by difussion, no study on presence of absence of pins. Mosses: possible polar transport, pins present. Ferns: polar transport investigated using compounds that prevent polar transport, no studies on pins. Mosses have pins at endoplasmic reticulum possibly ancestral. Thought pins at er were transferred to plasma membrane at some point in evolution. Pins in pm imply a much finer control effects as auxin flows in and effect as flows out. Pins in er are thought to be ancestral, but still present. Knox is a transcription factor found in all land plants (also in algae)
