The role of exogenous methyl jasmonate (MeJA) in alleviating drought stress was investigated on Huangguogan. Except for intercellular CO₂ concentration, MeJA had little effect on net photosynthetic rate, stomatal conductance, and transpiration rate under drought stress. Compared with drought stress, MeJA significantly alleviated the decrease of chlorophyll content. However, chlorophyll a/b ratio was significantly increased. MeJA significantly increased proline and soluble sugar contents, significantly decreased the O₂ ^−· and H₂O₂ levels, and increased SOD and POD activities. In addition, the MDA content of drought stress was the highest of all treatments. MeJA significantly reduced MDA content in drought-stressed Huangguogan leaves. Although the Ascorbic acid (AsA) contents of 500 and 1000 mg L⁻¹ MeJA treatments were lower than that of 250 mg L⁻¹ MeJA, but all concentration of MeJA treatments delayed the decline of AsA content. Therefore, MeJA could induce drought stress tolerance by increasing the osmotic adjustment substances and antioxidant activities.

在黄果干上研究了外源茉莉酸甲酯（MeJA）在缓解干旱胁迫中的作用。除细胞间CO ₂浓度外，MeJA对干旱胁迫下净光合速率，气孔导度和蒸腾速率的影响很小。与干旱胁迫相比，MeJA显着减轻了叶绿素含量的降低。但是，叶绿素的a / b比例却明显增加。MeJA显着增加脯氨酸和可溶性糖含量，显着降低O _2- ^·和H ₂ O ₂水平，以及增加的SOD和POD活动。另外，干旱胁迫的MDA含量是所有处理中最高的。MeJA显着降低了干旱胁迫的黄果干叶片中MDA含量。尽管500和1000 mg L ^-1 MeJA处理的抗坏血酸（AsA）含量低于250 mg L ^-1 MeJA处理的抗坏血酸，但所有浓度的MeJA处理均延迟了AsA含量的下降。因此，MeJA可通过增加渗透调节物质和抗氧化活性来诱导干旱耐受性。