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- Title
Proline but not Glutathione Actively Participates in the Tolerance Mechanism of Young Schizolobium parahyba var. amazonicum Plants Exposed to Boron Toxicity.
- Authors
SILVA, Paula Francyneth Nascimento; Silva Guedes LOBATO, Elaine Maria; de SOUZA, Pêola Reis; dos SANTOS, Helio José Medeiros; de Oliveira BRAGA, Rita; dos Santos MOURA, Adriano; da Silva LOBATO, Allan Klynger
- Abstract
Glutathione, a peptide frequently associated with the antioxidant mechanism of plants against reactive oxygen species, and proline, an amino acid whose function is related to cellular homeostasis, can both contribute to improve plant tolerance under situations of abiotic stress, such as boron toxicity. Aims of this research were to (i) quantify the oxidant and antioxidant compounds, (ii) evaluate the photosynthetic pigments, (iii) determine amino acids and PRO, and (iv) determine whether GSH and PRO contribute to the tolerance mechanisms in young Schizolobium parahyba var. amazonicum plants under B toxicity. This experiment tested five boron levels (25, 50, 100, 150 and 250 μM B), being evaluated physiological and biochemical variables. The values reported to proline levels presented significant variation for treatments with 50, 100, 150 and 250 μM B, with increases for the 150 and 250 μM B levels, being 45.2 and 52.4%, respectively. This study found that boron toxicity promoted similar behaviours in both the leaves and root, which included progressive increases in hydrogen peroxide, electrolyte leakage, amino acids and proline, and decreases in total glutathione, chlorophyll a, chlorophyll b and total chlorophyll, confirming that proline but not glutathione actively participates in the tolerance mechanism of young Schizolobium parahyba plants exposed to boron toxicity.
- Subjects
GLUTATHIONE; BRAZILIAN firetree; TOXICOLOGY of boron; ANTIOXIDANTS; PHOTOSYNTHETIC pigments
- Publication
Notulae Botanicae Horti Agrobotanici Cluj-Napoca, 2016, Vol 44, Issue 1, p215
- ISSN
0255-965X
- Publication type
Article
- DOI
10.15835/nbha44110102