Banca de QUALIFICAÇÃO: LUIZ FELIPE FERREIRA LOBO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : LUIZ FELIPE FERREIRA LOBO
DATA : 22/04/2019
HORA: 10:00
LOCAL: Sala de vídeo conferencia Parauapebas.
TÍTULO:

        Effect of 24-Epibrassinolide on tolerance to saline stress in cowpea cultivars [Vigna unguiculata (L.) WALP.]

PALAVRAS-CHAVES:

Brassinosteroid, saline stress, Vigna unguiculata.

PÁGINAS: 40
GRANDE ÁREA: Ciências Agrárias
ÁREA: Zootecnia
RESUMO:

Cowpea is one of the main crops of family agriculture, especially in the North and Northeast of Brazil. And this importance is not restricted only to high quality human food, as this legume is also widely used in animal feed, either in grazing, silage or silage, as well as being an efficient soil protection agent. However, the cultivation of cowpea still occurs with traditional techniques, without concern for increased production or improved productivity. situation that imposes the culture of the cowpea adverse conditions of cultivation causing a great roll of different environmental stresses, being the salinization of the soil and of the water of irrigation one of the most limiting factors of the vegetal development. Knowledge of the biochemical and physiological mechanisms under which saline stress occurs, the damage to vegetables, as well as ways of protecting, reacting and reversing these damages, is of paramount importance to agriculture in general. In this sense, the discovery of brassinosteroids (Brs), biochemical regulating phytorials of many phytobiological processes, has created a huge pool of study options that corroborate the importance of plant development research under stress conditions. In this phase, the objective of this work was to study the action of brassinosteroids as attenuator of oxidative stress, generated by saline stress in two cultivars of cowpea. The cultivars used for the experiment were Vigna unguiculata (L.) Walp .: BRS Tapaihum and Manteiguinha, classified as tolerant and sensitive to saline stress, respectively. A completely randomized experimental design (DIC) was used in a 2 x 3 x 3 factorial scheme, with two cultivars of cowpea, three concentrations of brassinosteroids (0, 0.2 and 0.4 μM Br) and three concentrations of NaCl (0 , 75 and 150 mM NaCl), with 4 replicates. The Na content in the leaves presented a mean increase of 441% and 479.2% for the cultivars Manteiguinha and BRS Tapaihum, respectively, with treatments of 75 and 150 mM NaCl in relation to the control treatments (0 mM NaCl). After addition of Br in the solution there was a mean reduction of 33.24% and 39.82% for the cultivars Manteiguinha and BRS Tapaihum, respectively, with treatments of 0.2 μM Br and a mean reduction of 41.13% and 48, The activity of the antioxidant enzymes (CAT, SOD, APX and GPX) was high in the treatments with higher salt concentrations (T4: 75 mM NaCl) and T5: 150 mM NaCl), remaining constant after addition of BR in the solution. The result of the work allows us to infer that BRs exert a positive action as attenuators of oxidative stress, generated by saline stress in cowpea.

MEMBROS DA BANCA:
Presidente - 1970202 - RICARDO SHIGUERU OKUMURA
Externo ao Programa - 1527122 - GLADIS DE OLIVEIRA JUCOSKI
Externo ao Programa - 2077542 - DAIANE DE CINQUE MARIANO
Externo à Instituição - LUMA CASTRO DE SOUZA - NENHUMA