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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Biocontrol agents promote growth of potato pathogens, depending on environmental conditions

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Author(s):
Cray, Jonathan A. [1] ; Connor, Mairead C. [1] ; Stevenson, Andrew [1] ; Houghton, Jonathan D. R. [1] ; Rangel, Drauzio E. N. [2] ; Cooke, Louise R. [3] ; Hallsworth, John E. [1]
Total Authors: 7
Affiliation:
[1] Queens Univ Belfast, Inst Global Food Secur, Sch Biol Sci, MBC, Belfast BT9 7BL, Antrim - North Ireland
[2] Univ Fed Goias, Inst Patol Trop & Saude Publ, BR-74605050 Goiania, Go - Brazil
[3] AFBI, Newforge Lane, Belfast BT9 5PX, Antrim - North Ireland
Total Affiliations: 3
Document type: Journal article
Source: MICROBIAL BIOTECHNOLOGY; v. 9, n. 3, p. 330-354, MAY 2016.
Web of Science Citations: 22
Abstract

There is a pressing need to understand and optimize biological control so as to avoid over-reliance on the synthetic chemical pesticides that can damage environmental and human health. This study focused oninteractions between a novel biocontrol-strain, Bacillus sp. JC12GB43, and potato-pathogenic Phytophthora and Fusarium species. In assays carried out in vitro and on the potato tuber, the bacterium was capable of near-complete inhibition of pathogens. This Bacillus was sufficiently xerotolerant (water activity limit for growth=0.928) to out-perform Phytophthora infestans (similar to 0.960) and challenge Fusarium coeruleum (similar to 0.847) and Fusarium sambucinum (similar to 0.860) towards the lower limits of their growth windows. Under some conditions, however, strain JC12GB43 stimulated proliferation of the pathogens: for instance, Fusarium coeruleum growth-rate was increased under chaotropic conditions in vitro (132 mM urea) by >100% and on tubers (2-M glycerol) by up to 570%. Culture-based assays involving macromolecule-stabilizing (kosmotropic) compatible solutes provided proof-of-principle that the Bacillus may provide kosmotropic metabolites to the plant pathogen under conditions that destabilize macromolecular systems of the fungal cell. Whilst unprecedented, this finding is consistent with earlier reports that fungi can utilize metabolites derived from bacterial cells. Unless the antimicrobial activities of candidate biocontrol strains are assayed over a full range of field-relevant parameters, biocontrol agents may promote plant pathogen infections and thereby reduce crop yields. These findings indicate that biocontrol activity, therefore, ought to be regarded as a mode-of-behaviour (dependent on prevailing conditions) rather than an inherent property of a bacterial strain. (AU)

FAPESP's process: 10/06374-1 - Visible light during growth enhances conidial tolerance to different stress conditions in fungi
Grantee:Drauzio Eduardo Naretto Rangel
Support type: Research Grants - Young Investigators Grants
FAPESP's process: 13/50518-6 - Stress related genes are induced by visible light during mycelial growth resulting in increased conidial tolerance to stress conditions
Grantee:Drauzio Eduardo Naretto Rangel
Support type: Regular Research Grants