Arabidopsis zinc-finger protein 2 is a negative regulator of ABA signaling during seed germination.
The hormone abscisic acid (ABA) mediates plant development and adaptation to environmental stresses. ABA-dependent transcription factors are central regulators of ABA signaling. Here, we report on the identification of the ABA-induced transcriptional repressor Arabidopsis zinc-finger protein 2 (AZF2) as ABA signaling component. We isolated azf2-1 mutants lacking AZF2 full-length transcripts that were hypersensitive to ABA during seed germination. In line with a function of AZF2 in seed germination and seedling development, AZF2-promoter activity was observed in radicles and young cotyledons of AZF2-promoter:GUS plants. Our results indicate that AZF2 is a negative regulator of ABA signaling in seeds.
Drechsel
Gabriele
G
Molekulare Pflanzenphysiologie, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstrasse 5, D-91058 Erlangen, Germany.
Raab
Sabine
S
Hoth
Stefan
S
D000040:Abscisic Acid / Q000494:pharmacology*; D017360:Arabidopsis / Q000187:drug effects* / Q000235:genetics / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D018506:Gene Expression Regulation, Plant / Q000187:drug effects / Q000235:genetics; D018525:Germination / Q000187:drug effects* / Q000235:genetics; D030821:Plants, Genetically Modified / Q000187:drug effects / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012639:Seeds / Q000187:drug effects* / Q000235:genetics / Q000378:metabolism*; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*
D029681:Arabidopsis Proteins; D014157:Transcription Factors; C530165:zinc finger protein 2, Arabidopsis; D000040:Abscisic Acid