Photosynthesis-Involvement in Modulation of Ascorbate and Glutathione in <i> Euterpe oleracea</i> Plants Exposed to Drought

  • Maria Antonia Machado BARBOSA Núcleo de Pesquisa Vegetal Básica e Aplicada, Universidade Federal Rural da Amazônia, Paragominas
  • Allan Klynger da Silva LOBATO Núcleo de Pesquisa Vegetal Básica e Aplicada, Universidade Federal Rural da Amazônia, Paragominas
  • Thaís Soares PEREIRA Núcleo de Pesquisa Vegetal Básica e Aplicada, Universidade Federal Rural da Amazônia, Paragominas
  • Gélia Dinah Monteiro VIANA Núcleo de Pesquisa Vegetal Básica e Aplicada, Universidade Federal Rural da Amazônia, Paragominas
  • José Ricardo Santos BARBOSA Núcleo de Pesquisa Vegetal Básica e Aplicada, Universidade Federal Rural da Amazônia, Paragominas
  • Kelly Nayara Nascimento COELHO Núcleo de Pesquisa Vegetal Básica e Aplicada, Universidade Federal Rural da Amazônia, Paragominas
  • Leila Sobral SAMPAIO Núcleo de Pesquisa Vegetal Básica e Aplicada, Universidade Federal Rural da Amazônia, Paragominas
  • Benedito Gomes dos SANTOS FILHO Núcleo de Pesquisa Vegetal Básica e Aplicada, Universidade Federal Rural da Amazônia, Paragominas
  • Joaquim Albenísio Gomes SILVEIRA Laboratório de Metabolismo de Plantas, Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Ceara, Fortaleza

Abstract

The present study aimed to determine if photosynthesis interferes with the modulation of antioxidant compounds in young Euterpe oleracea plants exposed to water deficiencies. A factorial, completely randomised experimental design was employed, and two water conditions (water deficit and control) and four evaluation points (0, 6, 12 and 18 days) were used, resulting in a total of eight measurements. The measured parameters included the water content and temperature of the leaf, gas exchange, electrolyte leakage, and antioxidant content. Compared to the control treatment, the net loss of photosynthesis due to water restriction increased by approximately 100% on the 18th day of drought. The ascorbate levels decreased due to water restriction, presenting significant differences on the 12th and 18th day. In some cases, the water deficit increased the glutathione content; however, significant effects were only observed on the 18th day after irrigation suspension. Water deficits had a negative impact on stomatal conductance, net photosynthesis rate, transpiration rate, and instantaneous carboxylation efficiency. Additionally, increases in the glutathione content, electrolyte leakage, and malondialdehyde content were observed; however, the ascorbate content decreased. Our results confirmed that the rate of photosynthesis interfered with the modulation of ascorbate and glutathione in young Euterpe oleracea plants exposed to drought.
Published
2014-06-03
How to Cite
BARBOSA, M. A. M., LOBATO, A. K. da S., PEREIRA, T. S., VIANA, G. D. M., BARBOSA, J. R. S., COELHO, K. N. N., SAMPAIO, L. S., SANTOS FILHO, B. G. dos, & SILVEIRA, J. A. G. (2014). Photosynthesis-Involvement in Modulation of Ascorbate and Glutathione in <i> Euterpe oleracea</i&gt; Plants Exposed to Drought. Notulae Botanicae Horti Agrobotanici Cluj-Napoca, 42(1), 119-127. https://doi.org/10.15835/nbha4219336
Section
Research Articles

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