Banca de QUALIFICAÇÃO: ANA PAULA DE MOURA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : ANA PAULA DE MOURA
DATA : 27/05/2026
HORA: 09:00
LOCAL: Formato Híbrido (Central de Aulas 02, Sala 10/UFERSA e Meet)
TÍTULO:

ARTIGO 01: Morphological and Multilocus Phylogenetic Characterization of Fusarium Species Causing Fruit Rot in Pumpkins

ARTIGO 02: Aggressiveness of Fusarium species in cucurbit fruits

PALAVRAS-CHAVES:

ARTIGO 01: Fruit rot. Fungal diseases. Molecular phylogeny. Pathogenicity

ARTIGO 02: Cucurbitaceae. Fruit rot. Fusarium spp. Virulence.

PÁGINAS: 61
RESUMO:

ARTIGO 01: Pumpkin (Cucurbita L.) is a cucurbit of great economic and social importance in Brazil. However, fruit rot caused by Fusarium species represents a significant limitation to crop production, compromising quality and hindering commercialization. This study aimed to identify the Fusarium species that cause pumpkin rot based on morphological characteristics and phylogenetic analyses of TEF1-α and RPB2 partial gene sequences, and to evaluate the pathogenicity of the identified isolates. The sampled pumpkins showed rots characterized by dry, light-colored lesions with a brownish necrotic halo. Twenty Fusarium isolates were obtained from ten pumpkin production areas. Koch's postulates were conducted to verify the pathogenicity of the isolates. Eight species were identified: F. falciforme (the most frequent in our isolation, at 35%), F. suttonianum, F. petroliphilum (FSSC), F. sulawesiense, F. pernambucanum (FIESC), F. delphinoides, F. dimerum (FDSC), and F. spinosum (FCSC). All isolates were pathogenic to pumpkins, with F. dimerum and F. petroliphilum being the most aggressive, whereas F. spinosum and F. delphinoides were the least aggressive isolates in this study. Five of these species are reported here for the first time, causing pumpkin rot. Our results expand knowledge of the diversity of Fusarium species associated with pumpkin rot in Northeast Brazil, providing information that can assist future management strategies for Fusariosis.

ARTIGO 02: Diseases are one of the main limiting factors in cucurbit production, and can cause significant yield losses, especially those caused by fungi of the genus Fusarium. The Fusarium species exhibit genetic and functional diversity, with significant differences in host range and symptom aggressiveness. To evaluate the aggressiveness of Fusarium species on different cucurbits, three experiments were conducted in a completely randomized design, in a 2 × 8 factorial scheme. The treatments consisted of inoculating eight Fusarium isolates (F. falciforme, F. petroliphilum, F. suttonianum, F. sulawesiense, F. pernambucanum, F. spinosum, F. dimerum, and F. delphinoides) on three cucurbit species with two varieties of each species (Butternut squash, Kabocha squash, Yellow melon, Galia melon, Harmonium watermelon, and Lux watermelon). At the end of the storage period, the severity of the disease was evaluated according to the size of the lesions. It was observed that all isolates of the eight species evaluated caused rot in the inoculated fruits, and the aggressiveness of the Fusarium species varied by crop and variety. In the experiments with pumpkins, the F. dimerum isolate was the most aggressive. The Kabocha pumpkin was the most susceptible variety. Isolates belonging to the F. solani species complex (FSSC) showed the greatest aggressiveness in the experiments with melon and watermelon. The resistance of melon varieties differed according to the fungal isolate. In watermelon, for most isolates, the Harmonium variety was the most resistant. Our results provide valuable information for the development of management strategies targeting Fusarium rot in cucurbits.

MEMBROS DA BANCA:
Externo à Instituição - DARLAN FERREIRA BORGES
Externo à Instituição - FRANCISCO ROMÁRIO ANDRADE FIGUEIREDO
Interna - 2578315 - JAILMA SUERDA SILVA DE LIMA
Presidente - 1544411 - MARCIA MICHELLE DE QUEIROZ AMBROSIO