Embrapa Agroindustria Tropical, Fortaleza, CE, Brazil.
Departamento de Agronomia, Universidade Federal do Ceará, Fortaleza, CE, Brazil.
Sci Rep. 2018 Oct 11;8(1):15141. doi: 10.1038/s41598-018-33496-7.
The Phyllanthus genus is widely distributed in tropical and subtropical areas of the world and present several pharmacological applications. Drought is a restrictive factor for crop development and production, and is becoming a severe problem in many regions of the world. The species Phyllanthus amarus and Phyllanthus niruri were subjected to drought stress for varying periods of time (0, 3, 5, 7, and 10 days), and afterwards, leaves were collected and evaluated for physiological and biochemical responses, such as oxidative stress markers and drought-associated defense mechanisms. Results show that P. amarus has an endogenously higher level of variables of the oxidative/antioxidant metabolism, and P. niruri presents the most significant changes in those variables when compared to control and stressed plants. For both Phyllanthus species, drought stress induces higher levels of organic acids such as malic, succinic, and citric acids, and amino acids such as proline, GABA, alanine, and valine. Moreover, P. niruri plants respond with greater glucose and corilagin contents. Therefore, considering the evaluated metabolic changes, P. amarus is better adapted to drought-stress, while P. niruri presents an acclimation strategy that increases the corilagin levels induced by short-term drought stress.
叶下珠属广泛分布于世界热带和亚热带地区，具有多种药理学应用。干旱是作物发育和生产的限制因素，在世界许多地区正成为一个严重的问题。对叶下珠和显脉叶下珠这两个物种进行了不同时间（0、3、5、7 和 10 天）的干旱胁迫处理，然后采集叶片，评估其生理和生化反应，如氧化应激标志物和与干旱相关的防御机制。结果表明，叶下珠属植物具有较高水平的氧化/抗氧化代谢变量，与对照和胁迫植物相比，显脉叶下珠属植物的这些变量变化最为显著。对于这两个叶下珠属物种，干旱胁迫都会诱导更高水平的有机酸，如苹果酸、琥珀酸和柠檬酸，以及氨基酸，如脯氨酸、GABA、丙氨酸和缬氨酸。此外，显脉叶下珠属植物的葡萄糖和柯里拉京含量也会增加。因此，考虑到评估的代谢变化，叶下珠属植物更能适应干旱胁迫，而显脉叶下珠属植物则呈现出一种适应策略，即在短期干旱胁迫下增加柯里拉京的水平。
