Banca de DEFESA: WENDELL VILHENA DE CARVALHO
Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.DISCENTE : WENDELL VILHENA DE CARVALHO
DATA : 23/02/2020
HORA: 09:00
LOCAL: Auditório Paulo Cavalcante
TÍTULO:
"Phenotypic variation in Curatella americana L. (Dilleniaceae) in open typologies of the Eastern Amazon"
PALAVRAS-CHAVES:
functional morpho-anatomy, plant-soil relationships, functional attributes.
PÁGINAS: 97
GRANDE ÁREA: Ciências Biológicas
ÁREA: Botânica
RESUMO:
The open areas of the Amazon basin cover an area of 150,000 km2, corresponding to approximately 42.3% of the Amazon. In these areas, the savannas, meadows and sandbanks have a strong filtering and selection effect on the species due to their restricted edaphic and climatic conditions. Curatella americana L. is a specie co-occurring in these environments, presenting a high ecological range. In this sense, understanding that variations occur in the functional attributes according to the physiological requirements and that these vary according to the soil and climatic conditions, this study wants to evaluate if there are variations in the leaf morphology and anatomical attributes of the branches in C. americana adopting the hypothesis that environmental conditions influence different patterns of plastic responses. During the dry season (Oct/2018) branches and soil samples of 10 ind/area were collected in the eastern portion of the Amazon. For morphological questions, were calculated: Leaf area (AF), specific leaf area (SLA), leaf thickness (EF), leaf dry matter content (LDMC) and branch density (DM). The usual techniques in wood anatomy were used to calculate the anatomical attributes: vessel diameter (D), vessel density (RV), sum of vessel area (VA), vulnerability index (VI), fraction of vessel lumen (F), non-lumen fraction (NF), hydraulic conductivity (Kh) and lumen resistivity (RL) (N = 3 ind./area). Permutational Multivariate Analysis of Variance (PERMANOVA), Principal Component Analysis (PCA) and Analysis of Variance (ANOVA) were performed with Tukey's post-hoc test using the free software R and Statistica (α = 0.05). C. americana was able to develop structural responses to edaphic and climatic variations with more expressive variations in leaves than in wood. The morphological attributes showed plastic responses more significant than the anatomical responses and, in relation to the hydraulic strategy, it has a high degree of xeromorphy (VI) and resistance to cavitation, investing in efficiency at the expense of safety. EF, LDMC, SLA, DM, VA and D were the attributes that best explained the morphoanatomical adjustments in the face of environmental variations.
MEMBROS DA BANCA:
Externo à Instituição - ANA CRISTINA ANDRADE DE AGUIAR DIAS - MPEG
Externo à Instituição - CLAUDIA VIANA URBINATI - UEPA
Presidente - 377.382.402-53 - ELY SIMONE CAJUEIRO GURGEL - MPEG
Externo à Instituição - MARKUS GASTAUER - ITV
Externo à Instituição - SÍLVIA FERNANDA MARDEGAN - UFPA