ANÁLISES FISIOLÓGICAS E HISTOPATOLÓGICAS DA INTERAÇÃO ENTRE OS FITOPATÓGENOS Fusarium equiseti E Diaporthe ueckerae EM PLANTAS DE Gossypium hirsutum

Abstract

Some fungi isolated from leaves of specimens of Gossypium hirsutum showed symptoms of already known diseases, however, when identified, they were not exactly the etiological agents of these diseases, but from the species Fusarium equiseti and Diaporthe ueckerae. The concern about undescribed diseases is worrisome, since the diagnosis vetoed by producers who are used to the field can be wrong, causing direct or indirect damage at various levels of the environment. Therefore, this project aimed to describe physiological and/or anatomical responses to attack by identified phytopathogens, aiming to better understand plant-pathogen biological interactions and accumulate information to indirectly enhance disease recognition and diagnosis for more effective decision-making, reduction in disease lethality and optimizing management techniques. For this, to measure stress and physiological damage generated in plants affected by these phytopathogens, analyzes were carried out to measure levels of photosynthetic pigments, measurement of chlorophyll fluorescence parameters and analyzes for gas exchange rates with the aid of IRGA; scanning electron microscopy; statistical analyzes were performed using ANOVA and Tukey (0.05<P). Several physiological alterations were observed in plants inoculated by Fusarium equiseti and by Diaporthe ueckerae, mainly in plants inoculated in the root part of plants in the phenological phase characterized by the presence of fruits, followed by plants in the flower bud phase.