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The Arabidopsis ABORTED MICROSPORES ( AMS ) gene encodes a MYC class transcription factor
Author(s) -
Sorensen AnnaMarie,
Kröber Sandra,
Unte Ulrike S.,
Huijser Peter,
Dekker Koen,
Saedler Heinz
Publication year - 2003
Publication title -
the plant journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.058
H-Index - 269
eISSN - 1365-313X
pISSN - 0960-7412
DOI - 10.1046/j.1365-313x.2003.01644.x
Subject(s) - microspore , tapetum , biology , genetics , gene , stamen , mutant , transcription factor , microbiology and biotechnology , pollen , botany
Summary 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.