Abstract:
:Receptor-like kinases (RLKs) are important components of plant innate immunity. Although recent studies have revealed that the RLK suppressor of BIR1-1 (SOBIR1) can interact with multiple receptor-like proteins and is required for resistance against fungal pathogens, how the signal is transduced and triggers immune responses remains enigmatic. In this study, we identified a defence-related RLK from Gossypium barbadense (designated GbSOBIR1) and investigated its functional mechanism. Expression of the GbSOBIR1 gene is ubiquitous in cotton plants and is induced by Verticillium dahliae inoculation. Knock-down of GbSOBIR1 by virus-induced gene silencing resulted in attenuated resistance of cotton plants to V. dahliae, while heterologous overexpression of GbSOBIR1 in Arabidopsis improves resistance. We also found that the kinase region of GbSOBIR1 interacts with a basic helix-loop-helix (bHLH) transcription factor identified as GbbHLH171 in a yeast-two-hybrid screen. GbbHLH171 could interact with and be phosphorylated by GbSOBIR1 in vitro and in vivo and contributes positively to the resistance of cotton against V. dahliae. Furthermore, we found that this phosphorylation is essential to the transcriptional activity and functional role of GbbHLH171. We also show by spectrometric analysis and site-directed mutagenesis that Ser413 is the GbSOBIR1-mediated phosphorylation site of GbbHLH171. These results demonstrate that GbSOBIR1 interacts with GbbHLH171 and plays a critical role in cotton resistance to V. dahliae.
journal_name
Plant Biotechnol Jjournal_title
Plant biotechnology journalauthors
Zhou Y,Sun L,Wassan GM,He X,Shaban M,Zhang L,Zhu L,Zhang Xdoi
10.1111/pbi.12954subject
Has Abstractpub_date
2019-01-01 00:00:00pages
152-163issue
1eissn
1467-7644issn
1467-7652journal_volume
17pub_type
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