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  The Arabidopsis ABORTED MICROSPORES (AMS) gene encodes a MYC class transcription factor

Sorensen, A. M., Kroeber, S., Unte, U. S., Huijser, P., Dekker, K., & Saedler, H. (2003). The Arabidopsis ABORTED MICROSPORES (AMS) gene encodes a MYC class transcription factor. Plant Journal, 33(2), 413-423.

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 Creators:
Sorensen, A. M.1, Author              
Kroeber, S.1, Author              
Unte, U. S.1, Author              
Huijser, P.1, Author              
Dekker, K.1, Author              
Saedler, H.1, Author              
Affiliations:
1Dept. of Molecular Plant Genetics (Heinz Saedler), MPI for Plant Breeding Research, Max Planck Society, ou_1113568              

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Free keywords: gametogenesis; microspore development; male sterility; basic helix-loop-helix motif; MYC family; Arabidopsis thaliana
 Abstract: Visual screening of a T-DNA mutagenised population of Arabidopsis thaliana for an absence of silique elongation lead to the isolation of the aborted microspores (ams ) mutant that shows a sporophytic recessive male sterile phenotype. Homozygous mutant plants are completely devoid of mature pollen. Pollen degeneration occurs shortly after release of the microspores from the tetrad, prior to pollen mitosis I. Premature tapetum and microspore degeneration are the primary defects caused by this lesion, while a secondary effect is visualised in the stamen filaments, which are reduced in length and lie beneath the receptive stigma at flower opening. The disrupted gene was isolated and revealed a T-DNA element to be inserted into the eighth exon of a basic helix-loop-helix (bHLH) gene located on chromosome II. This protein sequence contains a basic DNA binding domain and two alpha helices separated by a loop, typical of a transcription factor belonging to the MYC sub family of bHLH genes. Therefore, AMS plays a crucial role in tapetal cell development and the post- meiotic transcriptional regulation of microspore development within the developing anther.

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Language(s): eng - English
 Dates: 2003-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 42407
ISI: 000180475400018
 Degree: -

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Title: Plant Journal
  Alternative Title : Plant J.
Source Genre: Journal
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Pages: - Volume / Issue: 33 (2) Sequence Number: - Start / End Page: 413 - 423 Identifier: ISSN: 0960-7412