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          Institute: MPI für Pflanzenzüchtungsforschung     Collection: Dept. Molecular Plant Genetics (Heinz Saedler)     Display Documents

ID: 42407.0, MPI für Pflanzenzüchtungsforschung / Dept. Molecular Plant Genetics (Heinz Saedler)
The Arabidopsis ABORTED MICROSPORES (AMS) gene encodes a MYC class transcription factor
Authors:Sorensen, A. M.; Kroeber, S.; Unte, U. S.; Huijser, P.; Dekker, K.; Saedler, H.
Date of Publication (YYYY-MM-DD):2003-01
Title of Journal:Plant Journal
Journal Abbrev.:Plant J.
Issue / Number:2
Start Page:413
End Page:423
Review Status:Peer-review
Audience:Experts Only
Abstract / Description: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.
Free Keywords:gametogenesis; microspore development; male sterility; basic helix-loop-helix motif; MYC family; Arabidopsis thaliana
Comment of the Author/Creator:Date: 2003, JAN
External Publication Status:published
Document Type:Article
Communicated by:N.N.
Affiliations:MPI für Pflanzenzüchtungsforschung
External Affiliations:Max Planck Inst Plant Breeding Res, Dept Mol Plant Genet,; Cologne, Germany; Max Planck Inst Plant Breeding Res, Dept Mol Plant Genet, Cologne, Germany
Identifiers:ISI:000180475400018 [ID No:1]
ISSN:0960-7412 [ID No:2]
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