Banca de QUALIFICAÇÃO: CAMILLE FERREIRA MAIA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : CAMILLE FERREIRA MAIA
DATA : 21/07/2021
HORA: 15:00
LOCAL: On line
TÍTULO:

EXOGENOUS BRASSINOSTEROIDS INCREASE TOLERANCE TO OVERCOME THE DAMAGE BY NICKEL AND LEAD STRESS IN SOLANUM LICOPERSICUM L.

PALAVRAS-CHAVES:

Toxic pollutant, 24-epibrassinolide, Oxidative damage, Photosynthetic apparatus

PÁGINAS: 87
RESUMO:

Several toxic pollutants has been released into the atmosphere through countless human activities, represents a serious global ecological problem. One of these pollutants, are the heavy metals (HMs), which belong to the group of non-biodegradable inorganic chemical constituents and are the main threats to the environment due to their potentially cytotoxic, genotoxic, and mutagenic characteristics. Among of HM, Ni and Pb are elements that can cause phytotoxicity, affecting the physiological performance and biomass accumulation. To overcome these negative interferences, BR emerge as a new type of steroid phytohormones or even plant growth regulators (PGRs) that perform a variety of physiological functions such as growth, and that also confer resistance to plants against various biotic and abiotic stresses, being 24- epibrassnolide (EBR) one of the most biologically active. In these contexts, the aim of this study was to verify whether the exogenous application of EBR can alleviate the damage provoked by heavy metals induced stress, precisely by Ni and Pb, in tomato plants, evaluating the biochemical, physiological, anatomical, and nutritional responses. Thus, two experiments were planned and executed, the first analyzed the EBR action on deleterious effects of excess Ni (experiment I), and the second evaluated the role of this steroid in mitigating the Pb toxicity (experiment II). The two experiments were randomized with four treatments each, the first with two concentrations of nickel (0 and 400 µM Ni, described as - Ni and + Ni, respectively), and the second also with two concentrations of lead (0 and 200 µM Pb, described as - Pb and + Pb, respectively), both with two levels of EBR (0 and 100 nM EBR, described as - EBR and + EBR, respectively). Regarding experiment I, the results showed that EBR alleviated Ni stress through upregulating the antioxidant system, protecting the photosynthetic machinery and stimulating the accumulation of biomass. While for experiment II, the results demonstrate the interferences caused by Pb stress in tomato plants, however the exogenous application of EBR also mitigated the negatives effects, confirmed by the amelioration in the leaf anatomy, photosynthetic apparatus, and biomass. Therefore, this research demonstrated that EBR alleviated the damage provoked by Ni and Pb stress in tomato plants.

MEMBROS DA BANCA:
Presidente - 1803899 - ALLAN KLYNGER DA SILVA LOBATO
Externa ao Programa - 2930496 - LEIDY ALVES DOS SANTOS
Externo à Instituição - BRENO RICARDO SERRÃO DA SILVA - ITV
Externo à Instituição - FLÁVIO JOSÉ RODRIGUES CRUZ - UFRPE