7K89IXEQ

2269

23 décembre 2020 14:23

23 décembre 2020 14:23

Stabilized organic amendments (SOA) from poultry are used in agriculture to improve the conditions of the soil. SOAs favor the growth of the crops and reduces the effect of soil-borne plant-pathogens. However, in northern Chile, there are no studies to support this observation, nor have the mechanisms involved in the beneficial effects observed in the field been established. This work aims to establish whether the promotion of growth and control of soil fungi in tomato observed in the field as a result of commercial SOA application can be attributed to different endospore-forming bacteria (EFB). The effect of commercial SOA on nutrient availability was determined. EFB isolated from a commercial product, and the application of bacterial isolates were compared with the commercial formulation of SOA, for plant growth promotion (PGP) and biocontrol of Fusarium oxysporum fsp. radicis-lycopersici (FORL). The local tomato cultivar Poncho Negro was used given its sensitivity to different nutritional alterations and FORL. A series of measurements of growth parameters were carried out in plants submitted to different mixtures of SOA treatments. Isolates were identified by biochemical tests and sequencing of the 16S rRNA gene. Eleven EFB were isolated from SOA, and some tests were performed to determine the PGP and biocontrol of FORL activities of each isolate. Notably, isolates BAC22 (Bacillus megaterium), BAC21, and BAC23 (B. amyloliquefaciens/velezencis) were associated with PGP, highlighting the ability to produce indole-3-acetic acid, a trait that in many cases is key to explaining the effects of Bacillus spp.

None

• AB - Utile à l'AB
• biocontrol
• FREDO effluents et litière
• FREDO fertilisation
• FREDO santé végétale
• GEO Chili
• tomate

• fusarium oxysporum fsp. radicis-lycopersici
• PGP bacteria
• biocontrol
• poultry manure

Agronomy

10

1636

2020-10-23

23 octobre 2020

10.3390/agronomy10111636 Le DOI est une URL unique de référencement d'une publication. Il est donc plus fiable et permanent qu'une URL classique

2073-4395 L’ISSN est un code de 8 chiffres servant à identifier les journaux, revues, magazines, périodiques de toute nature et sur tous supports, papier comme électronique.