Abstract:
:Ubiquitin-mediated protein modification occurs at multiple steps of abscisic acid (ABA) signaling. Here, we sought proteins responsible for degradation of the pepper (Capsicum annuum) type 2C protein phosphatase CaADIP1 via the 26S proteasome system. We showed that the RING-type E3 ligase CaAIRF1 (Capsicum annuum ADIP1 Interacting RING Finger Protein 1) interacts with and ubiquitinates CaADIP1. CaADIP1 degradation was slower in crude proteins from CaAIRF1-silenced peppers than in those from control plants. CaAIRF1-silenced pepper plants displayed reduced ABA sensitivity and decreased drought tolerance characterized by delayed stomatal closure and suppressed induction of ABA- and drought-responsive marker genes. In contrast, CaAIRF1-overexpressing Arabidopsis (Arabidopsis thaliana) plants exhibited ABA-hypersensitive and drought-tolerant phenotypes. Moreover, in these plants, CaADIP1-induced ABA hyposensitivity was strongly suppressed by CaAIRF1 overexpression. Our findings highlight a potential new route for fine-tune regulation of ABA signaling in pepper via CaAIRF1 and CaADIP1.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Lim CW,Baek W,Lee SCdoi
10.1104/pp.16.01817subject
Has Abstractpub_date
2017-04-01 00:00:00pages
2323-2339issue
4eissn
0032-0889issn
1532-2548pii
pp.16.01817journal_volume
173pub_type
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