Banca de DEFESA: BRUNA MORISSO CARGNIN

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : BRUNA MORISSO CARGNIN
DATA : 15/06/2023
HORA: 13:30
LOCAL: sala de vídeo conferência
TÍTULO:

DO LEAF AND WOOD MORPHOANATOMIC ATTRIBUTES EXPLAIN THE CO-OCCURENCE OF SPECIES IN CONSTRUCTING PHYSIOLOGY IN SOUTHERN AMAZON?

PALAVRAS-CHAVES:

Cerrado-Amazon transition, functional anatomy, adaptation, climate change

PÁGINAS: 60
GRANDE ÁREA: Ciências Biológicas
ÁREA: Botânica
SUBÁREA: Morfologia Vegetal
ESPECIALIDADE: Anatomia Vegetal
RESUMO:

The changes that occur in the environment put pressure on vegetation, making ecosystems more vulnerable, and these changes can lead to adjustments in plant structures. In this sense, the combination of leaf and wood attributes form useful parameters for understanding plant strategies, such as those related to water stress, contributing to understanding responses to climate change. We know that the combinations of leaf and wood attributes need to be studied more deeply, so in order to understand how species behave in relation to the environment in which they are inserted, our study aims to analyze and compare the strategies of co-occurring plants in the Cerrado-Amazon transition (Cerradão and Amazonian savanna), in order to understand the structure and function relationship between leaf and wood. We carried out the study in the Cerrado-Amazon transition region in the north of the State of Mato Grosso, in two municipalities, which are: Nova Canaã do Norte and Alta Floresta. We collected forty individuals of four woody species (Dacryodes microcarpa, Emmotum nitens, Myrcia splendens and Simarouba versicolor) with co-occurrence in both areas. For each sample, we performed morphoanatomical measurements of leaf and wood attributes, in addition to estimated height, diameter at breast height and individual density. Several variations of leaf and stem attributes were found between species and we observed that there are some patterns in relation to intraspecific variability, such as the leaf area of individuals being greater in cerradão, except for the species S. versicolor. The first axis of the PCA was associated with characteristics related to efficiency in water use, regulation of water loss and hydraulic security and the second axis with characteristics related to photosynthetic rate and water transport. We observed that “Phytophysiognomy” explained low variation for most attributes, “Species” presented a high percentage for leaf and wood characteristics and “Individual” a high degree for wood attributes. It was possible to observe that the wood is more plastic in a general aspect of all species. In addition, we saw that there are functional characteristics that are essential to be able to predict the structural parameters of vegetation. Studies like this and other more in-depth ones become important, as climate change can influence the architecture of plants.

MEMBROS DA BANCA:
Presidente - 96420004 - IVONE VIEIRA DA SILVA
Interno - 70141009 - OSCAR MITSUO YAMASHITA
Externo ao Programa - 76100100 - PRISCILA FERNANDA SIMIONI
Externo à Instituição - MAURA DA CUNHA - UENF