Banca de QUALIFICAÇÃO: ALISSON DOS SANTOS OLIVEIRA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : ALISSON DOS SANTOS OLIVEIRA
DATA : 20/02/2024
HORA: 14:00
LOCAL: Sala de Video conferência- Unidade I Campus de Alta Floresta
TÍTULO:

Sensitivity of Amazonian savannah trees to high temperatures

PALAVRAS-CHAVES:

Climate change, Leaf thermotolerance, Amazonian savanna, Morphoanatomical Traits.

PÁGINAS: 66
GRANDE ÁREA: Ciências Biológicas
ÁREA: Botânica
SUBÁREA: Morfologia Vegetal
ESPECIALIDADE: Anatomia Vegetal
RESUMO:

Climate change represents an imminent threat to the planet, with projections of an increase in global temperatures, particularly affecting all terrestrial ecosystems, such as tropical forests. This study investigated the relationship between leaf thermotolerance and morphoanatomical attributes in tree species from the Amazon savanna, aiming to understand how structural characteristics can predict the ability of leaves to deal with high temperatures. We carried out field research in Nova Canaã do Norte, Mato Grosso, in an area close to the Teles Pires River, characterized as Amazonian rocky savanna. We determined leaf thermotolerance and morphoanatomical attributes of deciduous and evergreen species. Most species presented upper thermal limits above the maximum recorded temperatures, and future projections indicated alarming T50 estimates (loss of 50% of PSII function) for these species. We evidenced a significant influence of lacune parenchyma, abaxial epidermis thickness, leaf thickness, stomatal opening and density on leaf thermotolerance. Deciduous species showed greater sensitivity, indicating a high sensitivity to future warming. We highlight the proximity of the thermal limits of tropical trees to the maximum temperatures experienced, pointing to a high sensitivity to future warming. Deciduous species are particularly sensitive, suggesting drastic changes in the composition and structure of Amazonian Savanna forests. We demonstrated that certain morphoanatomical attributes can play crucial roles in the ability of leaves to deal with thermal variations. This finding suggests that understanding the morphoanatomical bases may be fundamental for predicting species' responses to future climate change.

MEMBROS DA BANCA:
Presidente - 96420004 - IVONE VIEIRA DA SILVA
Interno - 253812001 - PEDRO VASCONCELLOS EISENLOHR
Externo à Instituição - 715.248.197-00 - MAURA DA CUNHA - UENF
Externo à Instituição - 028.588.761-00 - PRISCILA FERNANDA SIMIONI - UENF