Banca de QUALIFICAÇÃO: Erivaldo Laurentino da Silva

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : Erivaldo Laurentino da Silva
DATE: 19/09/2022
TIME: 08:00
LOCAL: Videoconferência
TITLE:

Hormesis in Xanthomonas euvesicatoria pv. perforans and impact on biological control of bacterial spot disease on tomato.

KEY WORDS:

Xanthomonas; biological control; hormesis; Solanum lycopersicum.

PAGES: 80
BIG AREA: Ciências Biológicas
AREA: Biologia Geral
SUMMARY:

Phytopathogenic bacteria are prokaryotic organisms capable of causing serious damage to several crops of economic importance worldwide, including tomato (Solanum lycopersicum). Tomato cultivation have an extensive area in Brazil. With 51,452 hectares planted and an estimated production of 3.5 million tons of tomatoes in the year 2022, the country is the ninth largest producer in the world. The Integrated Development Region of the Federal District and Surroundings (IDR-DF), which encompasses areas of the Federal District, Goiás and Minas Gerais, corresponds to 10.78% of the national production of the fruit in an area of 4,774 hectares with about 74.28 % of production destined for industry. Among the bacterial diseasesthat affect the crop, bacterial spot caused by three species of Xanthomonas, among them X. euvesicatoria pv. perforans – Xep, is one of the most important foliar diseases. Its management is carried out in an integrated way, using different control methods, such as chemical and biological. However, for chemical control, the possibility of reducing its efficiency due to the emergence of resistant populations to the products, including those with multisite action, is worrying. These unwanted effects may be related to a phenomenon known as the hormesis effect. This effect is characterized by inhibition and stimulation of some characteristic of the organism, by exposure to high and low concentrations, respectively, of a toxic agent. Thus, sub-inhibitory doses to pathogens can lead to stimuli with quantifiable increases in disease severity and incidence. The impacts and potential of this effect are still poorly known and explored in plant pathology, but recent studies have demonstrated its potential for commercial application in agriculture. One of these applications would be to improve the biological control of diseases. Bacillus species are biocontrol agents widely used in commercial formulations due to their good ability to maintain agroecosystems. Five different commercial products based on Bacillus spp. are registered for the tomato crop, among them: Serenade (B. subtilis QST 713) and Duravel (Bacillus amyloliquefaciens MBI600). Thus, the aim of this work is to investigate the occurrence of hormesis in isolates of Xep, the predominant species in the DF and Surrounding areas, through the use of subinhibitory doses of different chemical products and their effects on growth, motility, biofilm formation and virulence of the pathogen, and in the optimization of the biological control of bacterial leaf spot on tomato with different commercial isolates of Bacillus spp.

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