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Plants (Basel)

Title:		A New Strategy to Improve Management of Citrus Mal Secco Disease Using Bioformulates Based on Bacillusamyloliquefaciens Strains
Author(s):		Aiello D; Leonardi GR; Di Pietro C; Vitale A; Polizzi G;
Address:		"Department of Agriculture, Food and Environment (Di3A), University of Catania, Via S. Sofia 100, 95123 Catania, Italy"
Journal Title:		Plants (Basel)
Year:		2022
Volume:		20220206
Issue:		3
Page Number:		-
DOI:		10.3390/plants11030446
ISSN/ISBN:		2223-7747 (Print) 2223-7747 (Electronic) 2223-7747 (Linking)
Abstract:		"The effectiveness of biological commercial products based on Bacillus amyloliquefaciens strains was evaluated through in vitro and in vivo experiments against Plenodomus tracheiphilus. The activity of bacterial cells, volatile organic compounds (VOCs), and culture filtrates of bacteria were tested in vitro against different isolates of P. tracheiphilus. Afterwards, the virulence of these isolates was evaluated on Citrus volkameriana plants to select the most virulent isolate to use in the in vivo experiments. To evaluate the effectiveness of products, C. volkameriana seedlings were pre-treated, twice with biological products and once with standard fungicides, before pathogen inoculation. Moreover, in order to determine the endophytic ability of the bacteria, the population density within the treated citrus stem was determined. Comprehensively, bacterial cells, filtrates, and VOCs were able to significantly reduce the average mycelial diameter of P. tracheiphilus, with some variability according to pathogen isolate. In planta experiments showed that the biological products on average were less effective than fungicides, although all formulates were able to significantly reduce disease incidence and symptom severity, except B. amyloliquefaciens strain D747 (Amylo-X) for symptom severity (SS) 20 days after inoculation. Bacteria were re-isolated from the internal woody tissue of treated plants, showing strong endophytic ability. This work is important as commercial biological products based on B. amyloliquefaciens strains could represent a promising and sustainable alternative for the integrated management of mal secco disease"
Keywords:		Bacillus amyloliquefaciens Plenodomus tracheiphilus biological control citrus mal secco disease;
Notes:		"PubMed-not-MEDLINEAiello, Dalia Leonardi, Giuseppa Rosaria Di Pietro, Chiara Vitale, Alessandro Polizzi, Giancarlo eng Switzerland 2022/02/16 Plants (Basel). 2022 Feb 6; 11(3):446. doi: 10.3390/plants11030446"