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Plant J. 2015 Sep;83(6):976-90. doi: 10.1111/tpj.12942. Epub 2015 Aug 26.

The DYT1-interacting proteins bHLH010, bHLH089 and bHLH091 are redundantly required for Arabidopsis anther development and transcriptome.

Author information

1
State Key Laboratory of Genetic Engineering, Collaborative Innovation Center of Genetics and Development, Institute of Plant Biology, School of Life Sciences, Fudan University, Shanghai, 200433, China.
2
Key Laboratory of Biodiversity Sciences and Ecological Engineering, Ministry of Education, Institute of Biodiversity Sciences, Center for Evolutionary Biology, School of Life Sciences, Fudan University, Shanghai, 200433, China.

Abstract

The anther is the male reproductive organ of flowering plants, and the Arabidopsis bHLH transcription factors encoded by DYSFUNCTIONAL TAPETUM1 (DYT1) and ABORTED MICROSPORE (AMS) are required for control of the complex transcriptional networks regulating anther development. Knowledge of the mechanisms by which the bHLH proteins affect this diverse gene expression is quite limited. We examine here three recently duplicated Arabidopsis bHLH genes, bHLH010, bHLH089 and bHLH091, using evolutionary, genetic, morphological and transcriptomic approaches, and uncover their redundant functions in anther development. These three genes are relatively highly expressed in the tapetum of the Arabidopsis anther; single mutants at each of the bHLH010, bHLH089 and bHLH091 loci are developmentally normal, but the various double and triple combinations progressively exhibit increasingly defective anther phenotypes (abnormal tapetum morphology, delayed callose degeneration, and aborted pollen development), indicating their redundant functions in male fertility. Further transcriptomic and molecular analyses suggest that these three proteins act slightly later than DYT1, and also form protein complexes with DYT1, subsequently affecting the correct expression of many DYT1 target genes in the anther development transcriptional network. This study demonstrated that bHLH010, bHLH089 and bHLH091 together are important for the normal transcriptome of the developing Arabidopsis anther, possibly by forming a feed-forward loop with DYT1.

KEYWORDS:

Arabidopsis thaliana; anther development; gene duplication; molecular phenotype; redundant functions; transcriptome

PMID:
26216374
DOI:
10.1111/tpj.12942
[Indexed for MEDLINE]
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