Banca de DEFESA: JAVIER KAYNAN TRINDADE

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE: JAVIER KAYNAN TRINDADE
DATA: 21/07/2025
HORA: 08:30
LOCAL: Online via Google Meet: https://meet.google.com/oyd-zeow-mon
TÍTULO:

From Ashes to Sprouts: priming and Fire-Induced Seed Germination of Campo Rupestre species

PALAVRAS-CHAVES:

Campo Rupestre; Fire; Smoke; Germination; Seedlings; Priming

PÁGINAS: 55
GRANDE ÁREA: Ciências Biológicas
ÁREA: Botânica
SUBÁREA: Fisiologia Vegetal
ESPECIALIDADE: Nutrição e Crescimento Vegetal
RESUMO:

Fire is a natural disturbance integral to open ecosystems such as the Campo Rupestre (CR), where species have adapted and thrived in post-fire conditions over time. Although fire is present in this environment, its effects on vegetation dynamics are still poorly understood, but it is known that it plays an important role in the recruitment of seedlings from seeds found in the soil seed bank, which can experience cycles of hydration and dehydration by absorbing chemical molecules derived from burning vegetation. Here, we investigated the technique of priming seeds with smoke compounds in seeds of Vellozia compacta and Vellozia caruncularis in a simulation of the passage of fire through the seed bank. Germination parameters were analyzed (% germination and germination speed index - GSI) and biochemical markers (total soluble sugars, total amino acids and malondialdehyde - MDA) were quantified in the seedlings. Priming with “smoked water” showed better germination parameters in both species in the fire simulation conditions, while for the biochemical parameters in the seedlings, the amount of total soluble sugars and total amino acids was higher in the control conditions and under fire simulation with the ashes, and this response was more stimulated with the application of priming. As for responses to oxidative damage, priming was important for reducing MDA, a compound formed by membrane peroxidation. This study suggests that the physiological and biochemical effects of priming CR seeds with chemical components from smoke can generate a memory in plants in the initial growth phase. However, this response is complex and further studies are needed to understand the role of fire in germination and seedling recruitment. 

MEMBROS DA BANCA:
Externo à Instituição - ROSANA MARTA KOLB - UNESP (Membro)
Externo à Instituição - LEANDRO ELIAS MORAIS - IFMG (Membro)
Externo à Instituição - GEOVANE DA SILVA DIAS - UFV (Suplente)
Presidente - ELISA MONTEZE BICALHO - UFV (Membro)
Externo ao Programa - ANDERSON CLEITON JOSE - DCF/ESAL (Suplente)