Zhejiang Key Laboratory of Crop Gene Resources, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China.
Faculty of Agriculture, the University of Poonch, Rawalakot, Azad Jammu & Kashmir 12350, Pakistan.
J Zhejiang Univ Sci B. 2018;19(2):130-146. doi: 10.1631/jzus.B1700191.
The well-known detrimental effects of cadmium (Cd) on plants are chloroplast destruction, photosynthetic pigment inhibition, imbalance of essential plant nutrients, and membrane damage. Jasmonic acid (JA) is an alleviator against different stresses such as salinity and drought. However, the functional attributes of JA in plants such as the interactive effects of JA application and Cd on rapeseed in response to heavy metal stress remain unclear. JA at 50 µmol/L was observed in literature to have senescence effects in plants. In the present study, 25 µmol/L JA is observed to be a "stress ameliorating molecule" by improving the tolerance of rapeseed plants to Cd toxicity. JA reduces the Cd uptake in the leaves, thereby reducing membrane damage and malondialdehyde content and increasing the essential nutrient uptake. Furthermore, JA shields the chloroplast against the damaging effects of Cd, thereby increasing gas exchange and photosynthetic pigments. Moreover, JA modulates the antioxidant enzyme activity to strengthen the internal defense system. Our results demonstrate the function of JA in alleviating Cd toxicity and its underlying mechanism. Moreover, JA attenuates the damage of Cd to plants. This study enriches our knowledge regarding the use of and protection provided by JA in Cd stress.
镉（Cd）对植物的危害作用是众所周知的，包括破坏叶绿体、抑制光合作用色素、植物必需营养元素失衡和膜损伤。茉莉酸（JA）是一种缓解剂，可对抗盐度和干旱等不同压力。然而，JA 在植物中的功能属性，如 JA 应用与 Cd 对油菜响应重金属胁迫的相互作用，仍不清楚。文献中观察到 50µmol/L 的 JA 对植物具有衰老作用。在本研究中，观察到 25µmol/L 的 JA 通过提高油菜植物对 Cd 毒性的耐受性成为一种“应激缓解分子”。JA 减少叶片对 Cd 的吸收，从而减少膜损伤和丙二醛含量，增加必需营养元素的吸收。此外，JA 保护叶绿体免受 Cd 的破坏作用，从而增加气体交换和光合作用色素。此外，JA 调节抗氧化酶活性以增强内部防御系统。我们的研究结果表明 JA 具有缓解 Cd 毒性的作用及其潜在机制。此外，JA 减轻了 Cd 对植物的损害。本研究丰富了我们对 JA 在 Cd 胁迫下的应用和保护的认识。
