Name: Geovane Souza Gudin
Type: MSc dissertation
Publication date: 09/03/2021
Advisor:

Name	Role
Diolina Moura Silva	Advisor *
Idalina Tereza de Almeida Leite	Advisor *
Pedro Corrêa Damasceno Junior	Co-advisor *

Examining board:

Name	Role
Antelmo Ralph Falqueto	Internal Examiner *
Aureliano Nogueira da Costa	External Examiner *
Diolina Moura Silva	Advisor *
Ivoney Gontijo	External Examiner *
MARCOS ANTONIO BACARIN	External Alternate *
MARIELA MATTOS DA SILVA	Internal Examiner *
Pedro Corrêa Damasceno Junior	Co advisor *
SABRINA GARCIA BROETTO	Internal Alternate *

Summary: The plants in the sandbank are adapted to environments with high temperature
and salinity. However, any anthropogenic factor can influence the maintenance
of homeostasis and survival of these plants. The rupture of the Fundão dam,
Mariana-MG, impacted all living beings that, directly or indirectly, came into
contact with the mud containing mining waste that contaminated the Doce
River. In this sense, this study involved plants of Canavalia rosea and Eugenia
astringens, located in the herbaceous and shrub physiognomies, respectively,
in the restinga of the municipalities of Linhares and São Mateus, north of the
state of Espírito Santo. Two assessments were carried out in 2019, one in the
rainy season and the other in the dry season. Through the collection of soil and
leaves, the trace elements were quantified and by the chlorophyll transient
fluorescence technique the effect of the trace elements on the photochemical
step of photosynthesis of these plants was evaluated. It was possible to detect
the presence of trace elements in the soil and leaves of the plants and the
interaction between them. In addition, there was also interaction between the
trace elements found in the leaves with parameters in all photochemical stages
of photosynthesis: energy capture, reduction and dissipation (ABS/RC, TR 0 /RC,
RE 0 /RC e DI 0 /RC). It was also possible to observe, with the kinetic difference
between the transients, the appearance of positive K, L and G bands in the
plants studied in the two periods evaluated, which indicated the negative effect
of trace elements on the electron transport chain. Thus, the extent of damage of
these elements in the photochemical step of photosynthesis ranged from the
malfunction of the center of evolution of oxygen and connectivity of the
components of photosystem II to the oxidation of the final electron acceptors of
photosystem I. Such results prove that the remnants of the mining waste that
reached these sandbank areas are impacting the vegetation and interfering with
their survival mechanisms.
Keywords: sandbank, mining, chlorophyll fluorescence, trace elements, rio
Doce

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