Estudo da variação metabolômica de espécies de Phyllanthus spp submetidas a déficit hídrico

Abstract

Known for its pharmacological applications, the genus Phyllanthus is widely distributed in tropical and subtropical regions of the world. This like most vegetables can have its development restricted by water deficit. The species Phyllanthus amarus and Phyllanthus niruri were submitted to various periods of water deficit (0, 3, 5, 7 and 10 days), and later the aerial part were collected and evaluated for physiological and biochemical parameters. To identify markers of oxidative stress and defense mechanisms in response to water deficit. Results show that P. amarus has a high endogenous level of oxidative / antioxidant metabolism variables, and P. niruri presents the most significant changes in these variables when compared to control and stress plants. For both Phyllanthus species, water stress induces higher levels of organic acids such as malic, succinic and citric acids, and amino acids such as proline, GABA, alanine and valine. In addition, P. niruri plants respond with higher levels of glucose and corilagin. Therefore, considering the metabolic changes evaluated, P. amarus is more adapted to water stress, while P. niruri presents an acclimatization strategy that increases corilagine levels induced by short-term water stress.