Regulation of floral organ-identity gene expression

Type :

Presentation

Pages :

5 pages

Format :

.doc

Published date :

11/17/2008

Category :

Science & technology

Sub category :

Biology

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Summary :

Introduction.
Floral organ-identity gene expression.
1. A key advancement in the field of flower development.
2. Expression of each of the floral organ-identity genes.
Regulation of AP1 expression.
Initiation of B class gene expression by LFY, UFO and AP1.
Maintenance of class B gene expression.
Initiation of AG expression by LFY and WUS.
Transcriptional repression of AG.
Post-transcriptional regulation of AG.
Translational repression of AP2.
Conclusion.

Abstract

A key advance in the field of flower development has been the uncovering of a direct role for the FM-identity gene LEAFY (LFY) in activation of the floral organ-identity genes. LFY encodes a novel plant-specific DNA-binding protein that can bind in vitro to the promoters of several floral organ-identity genes. While LFY possesses DNA-binding activity, it does not appear to have intrinsic transcriptional-activation activity. Thus LFY may need to interact with additional proteins to function in transcriptional regulation. LFY can directly regulate the transcription of at least one representative of each of the class A, B and C genes but uses distinct mechanisms to activate expression of each of these genes in a region-specific manner. LFY alone is sufficient to activate expression of the class A gene AP1 throughout the flower.