title: Vascular plant one-zinc-finger protein 1/2 transcription factors regulate abiotic and biotic stress responses in Arabidopsis.
abstract: Plants adapt to abiotic and biotic stresses by activating abscisic acid-mediated (ABA) abiotic stress-responsive and salicylic acid-(SA) or jasmonic acid-mediated (JA) biotic stress-responsive pathways, respectively. Although the abiotic stress-responsive pathway interacts antagonistically with the biotic stress-responsive pathways, the mechanisms that regulate these pathways remain largely unknown. In this study, we provide insight into the function of vascular plant one-zinc-finger proteins (VOZs) that modulate various stress responses in Arabidopsis. The expression of many stress-responsive genes was changed in the voz1voz2 double mutant under normal growth conditions. Consistent with altered stress-responsive gene expression, freezing- and drought-stress tolerances were increased in the voz1voz2 double mutant. In contrast, resistance to a fungal pathogen, Colletotrichum higginsianum, and to a bacterial pathogen, Pseudomonas syringae, was severely impaired. Thus, impairing VOZ function simultaneously conferred increased abiotic tolerance and biotic stress susceptibility. In a chilling stress condition, both the VOZ1 and VOZ2 mRNA expression levels and the VOZ2 protein level gradually decreased. VOZ2 degradation during cold exposure was completely inhibited by the addition of the 26S proteasome inhibitor, MG132, a finding that suggested that VOZ2 degradation is dependent on the ubiquitin/26S proteasome system. In voz1voz2, ABA-inducible transcription factor CBF4 expression was enhanced significantly even under normal growth conditions, despite an unchanged endogenous ABA content. A finding that suggested that VOZs negatively affect CBF4 expression in an ABA-independent manner. These results suggest that VOZs function as both negative and positive regulators of the abiotic and biotic stress-responsive pathways, and control Arabidopsis adaptation to various stress conditions.
authors.affiliation: Graduate School of Life and Environmental Sciences, Kyoto Prefectural University, Kyoto 606-8522, Japan.
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Nakai
authors.forename: Yoichi
authors.initials: Y
authors.lastname: Nakahira
authors.forename: Hiroki
authors.initials: H
authors.lastname: Sumida
authors.forename: Kosuke
authors.initials: K
authors.lastname: Takebayashi
authors.forename: Yumiko
authors.initials: Y
authors.lastname: Nagasawa
authors.forename: Kanako
authors.initials: K
authors.lastname: Yamasaki
authors.forename: Masako
authors.initials: M
authors.lastname: Akiyama
authors.forename: Masaru
authors.initials: M
authors.lastname: Ohme-Takagi
authors.forename: Sumire
authors.initials: S
authors.lastname: Fujiwara
authors.forename: Takashi
authors.initials: T
authors.lastname: Shiina
authors.forename: Nobutaka
authors.initials: N
authors.lastname: Mitsuda
authors.forename: Eiichiro
authors.initials: E
authors.lastname: Fukusaki
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Kubo
authors.forename: Masa H
authors.initials: MH
authors.lastname: Sato
mesh_terms: D000040:Abscisic Acid / Q000378:metabolism*; D017360:Arabidopsis / Q000187:drug effects / Q000235:genetics* / Q000382:microbiology / Q000502:physiology; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D020231:Colletotrichum / Q000502:physiology; D015853:Cysteine Proteinase Inhibitors / Q000494:pharmacology; D015536:Down-Regulation; D055864:Droughts; D005615:Freezing; D020869:Gene Expression Profiling; D018506:Gene Expression Regulation, Plant; D007976:Leupeptins / Q000494:pharmacology; D009154:Mutation; D020411:Oligonucleotide Array Sequence Analysis; D010935:Plant Diseases / Q000382:microbiology; D010937:Plant Growth Regulators / Q000378:metabolism; D018515:Plant Leaves / Q000187:drug effects / Q000235:genetics / Q000382:microbiology / Q000502:physiology; D054046:Plant Stomata / Q000187:drug effects / Q000235:genetics / Q000382:microbiology / Q000502:physiology; D030821:Plants, Genetically Modified; D044224:Pseudomonas syringae / Q000502:physiology; D020156:Salicylic Acid / Q000378:metabolism*; D036226:Seedlings / Q000187:drug effects / Q000235:genetics / Q000382:microbiology / Q000502:physiology; D013312:Stress, Physiological; D015534:Trans-Activators / Q000235:genetics / Q000378:metabolism; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism; D016335:Zinc Fingers
chemical_list: D029681:Arabidopsis Proteins; C470668:CBF4 protein, Arabidopsis; D015853:Cysteine Proteinase Inhibitors; D007976:Leupeptins; D010937:Plant Growth Regulators; D015534:Trans-Activators; D014157:Transcription Factors; C492827:VOZ1 protein, Arabidopsis; C492828:VOZ2 protein, Arabidopsis; D000040:Abscisic Acid; D020156:Salicylic Acid; C072553:benzyloxycarbonylleucyl-leucyl-leucine aldehyde