Banca de QUALIFICAÇÃO: VIRGINIA SOUSA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE: VIRGINIA SOUSA
DATA: 11/12/2026
HORA: 14:00
LOCAL: Anfiteatro do DEN - híbrido
TÍTULO:

Resistance of maize landrace varieties to Spodoptera frugiperda: role of trichomes, phenolics, lignin, and proteins

PALAVRAS-CHAVES:

host plant resistance; fall armyworm; antibiosis; antixenosis

PÁGINAS: 50
GRANDE ÁREA: Ciências Agrárias
ÁREA: Agronomia
SUBÁREA: Fitossanidade
ESPECIALIDADE: Entomologia Agrícola
RESUMO:

The fall armyworm, Spodoptera frugiperda, is a major maize pest, and identifying resistance sources in traditional germplasm may contribute to sustainable pest management and genetic breeding programs. In this study we evaluated maize landrace varieties for the resistance to S. frugiperda and associated the most promising with density of leaf trichomes and concentrations of phenolics, lignin, and proteins. In the first experiment conducted with 19 landrace varieties, Tumikata, Carioca, and Cunha were associated with reduced larval survival; Doce showed reduced leaf consumption and larval weight; and Alai caused lower larval weight. The varieties Cunha and Carioca were the least preferred for oviposition, whereas Branco 51 and Doce showed higher total egg numbers. Tumikata exhibited the most consistent resistance-related response, with persistent constraints on larval performance. Branco 51 showed delayed effects that became more evident during prolonged feeding, whereas Doce exhibited an early reduction in larval feeding and biomass that was less persistent over time. Doce and Tumikata had the highest trichome densities, while Doce also showed higher lignin concentration. However, no single measured plant trait consistently explained S. frugiperda performance. Overall, the results demonstrate that maize landraces exhibit distinct trajectories of resistance-related responses, expressed through different components of S. frugiperda biological development. Tumikata, Branco 51, and Doce represent potentially complementary sources of resistance-related traits, emphasizing the importance of integrating feeding, survival, growth, and development when evaluating maize resistance.

MEMBROS DA BANCA:
Interno - ROSANGELA CRISTINA MARUCCI (Membro)
Externo à Instituição - MAURICIO URSI VENTURA - UEL (Membro)
Presidente - LUIS CLAUDIO PATERNO SILVEIRA (Membro)
Interno - GERALDO ANDRADE DE CARVALHO (Membro)
Externo à Instituição - FERNANDO TERUHIKO HATA - UEM (Suplente)
Interno - ALCIDES MOINO JUNIOR (Suplente)