CGTase, a novel antimicrobial protein from Bacillus cereus YUPP‐10, suppresses Verticillium dahliae and mediates plant defence responses. (23rd November 2020)

• Record Type: Journal Article
• Authors: Zhou, Jinglong; Feng, Zili; Liu, Shichao; Wei, Feng; Shi, Yongqiang; Zhao, Lihong; Huang, Wanting; Zhou, Yi; Feng, Hongjie; Zhu, Heqin
• Is Part Of: Molecular plant pathology. Volume 22:Number 1(2021)
• Page Start: 130
• Page End: 144
• Publication Date: 2020-11-23
• Subjects: antimicrobial protein -- CGTase -- induced systemic resistance -- Verticillium dahliae; Plant diseases -- Molecular aspects -- Periodicals; Plant-pathogen relationships -- Molecular aspects -- Periodicals; 571.936
• DOI: 10.1111/mpp.13014
• Languages: English
• ISSNs: 1464-6722

Abstract

Abstract: Verticillium wilt is a plant vascular disease caused by the soilborne fungus Verticillium dahliae that severely limits cotton production. In a previous study, we screened Bacillus cereus YUPP‐10, an efficient antagonistic bacterium, to uncover mechanisms for controlling verticillium wilt. Here, we report a novel antimicrobial cyclodextrin glycosyltransferase (CGTase) from YUPP‐10. Compared to other CGTases, six different conserved domains were identified, and six mutants were constructed by gene splicing with overlap extension PCR. Functional analysis showed that domain D was important for hydrolysis activity and domains A1 and C were important for inducing disease resistance. Direct effects of recombinant CGTase on V. dahliae included reduced mycelial growth, spore germination, spore production, and microsclerotia germination. In addition, CGTase also elicited cotton's innate defence reactions. Transgenic Arabidopsis thaliana lines that overexpress CGTase showed higher resistance to verticillium wilt. Transgenic CGTase A. thaliana plants grew faster and resisted disease better. CGTase overexpression enabled a burst of reactive oxygen species production and activated pathogenesis‐related gene expression, indicating that the transgenic cotton was better prepared to protect itself from infection. Our work revealed that CGTase could inhibit the growth of V. dahliae, activate innate immunity, and play a major role in the biocontrol of fungal pathogens. Abstract : Cyclodextrin glycosyltransferase, a hydrolytic protease from Bacillus cereus YUPP‐10, inhibits the growth of Verticillium dahliae and activates cotton innate immunity. The domains for hydrolysis activity and disease resistance induction were identified.