Respostas ecofisiológicas de eucalipto inoculados com diferentes isolados de Ceratocystis fimbriata

Patrick Costa Silva; Marciane Furtado Freitas; Jailma Ribeiro de Andrade; Sebastião de Oliveira Maia Júnior; Danielle Lopes Aguiar; Cristiele Assunção Matão; Erlen Keila Candido Silva; Antonia Alice Costa Rodrigues; Tiago Massi Ferraz; Fábio Afonso Mazzei Moura de Assis Figueiredo

doi:10.53661/1806-9088202448263834

Authors

Patrick Costa Silva Universidade Estadual do Maranhão, Programa de Pós-Graduação em Ciências Agrárias, São Luís, MA, Brasil https://orcid.org/0000-0002-5052-9258
Marciane Furtado Freitas Universidade Estadual do Maranhão, Mestrado em Agricultura e Ambiente, São Luís, MA, Brasil https://orcid.org/0000-0002-6026-1216
Jailma Ribeiro de Andrade Universidade Estadual do Maranhão, Programa de Pós-Graduação em Ciências Agrárias, São Luís, MA, Brasil https://orcid.org/0000-0003-1790-8544
Sebastião de Oliveira Maia Júnior Universidade Estadual do Maranhão, Programa de Pós-Graduação em Ciências Agrárias, São Luís, MA, Brasil https://orcid.org/0000-0002-3018-9030
Danielle Lopes Aguiar Universidade Estadual do Maranhão, Mestrado em Agricultura e Ambiente, São Luís, MA, Brasil https://orcid.org/0000-0002-6691-867X
Cristiele Assunção Matão Universidade Estadual do Maranhão, Mestrado em Agricultura e Ambiente, São Luís, MA, Brasil https://orcid.org/0000-0001-8335-3853
Erlen Keila Candido Silva Universidade Estadual do Maranhão, Departamento de Agronomia, Balsas, MA, Brasil https://orcid.org/0000-0002-3794-3710
Antonia Alice Costa Rodrigues Universidade Estadual do Maranhão, Departamento de Fitotecnia e Fitossanidade, São Luís, MA, Brasil https://orcid.org/0000-0002-9084-0868
Tiago Massi Ferraz Universidade Estadual do Maranhão, Departamento de Zootecnia, São Luís, MA, Brasil https://orcid.org/0000-0002-9840-3523
Fábio Afonso Mazzei Moura de Assis Figueiredo Universidade Estadual do Maranhão, Departamento de Zootecnia, São Luís, MA, Brasil https://orcid.org/0000-0002-6904-9828

DOI:

https://doi.org/10.53661/1806-9088202448263834

Keywords:

Virulence, Gas exchange, Pathogenicity, Thermography

Abstract

Ever-increasing industrial demand means that forest stands and the number of areas with Eucalyptus plantations are growing rapidly in Brazil and worldwide. This has increased the use of genetic materials, increasing the incidences of pests and diseases. Wilt is caused by the Ceratocystis fimbriata fungus, which is one of the most common diseases in Eucalyptus plantations. This study aimed to evaluate the ecophysiological responses of clonal seedlings of Eucalyptus spp. inoculated with different C. fimbriata isolates. The treatments were LPF 1512, 1806, 1607, and 1657 from the states of São Paulo, Minas Gerais, Bahia, and Mato Grosso do Sul, respectively, and a control comprising distilled water. Fungal isolates were inoculated 60 days after seedling planting. After inoculation, the growth, gas, leaf temperature, and chlorophyll a fluorescence were analyzed. Regardless of the isolate, inoculation with C. fimbriata increased water flow resistance in the xylem vessels of Eucalyptus plants, causing water stress. This results in reduced gas exchange and compromised photosynthetic performance, as evidenced by decreased absorption flux per reaction center and low photosynthetic index values. Furthermore, fungal pathogenicity analysis indicated that the LPF 1657 isolate was most virulent to Eucalyptus seedlings, directly affecting the height, photosynthetic CO₂ assimilation, stomatal conductance, and transpiration of the inoculated plants.

Keywords: Virulence; Gas exchange; Pathogenicity; Thermography