Alleviation of drought stress and the physiological mechanisms in Citrus cultivar (Huangguogan) treated with methyl jasmonate
2020
Xiong, Bo | Wang, Yuan | Zhang, Yue | Ma, Mengmeng | Gao, Yifei | Zhou, Zhiyang | Wang, Bozhi | Wang, Tie | Lv, Xiulan | Wang, Xun | Wang, Jin | Deng, Honghong | Wang, Zhihui
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.
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