| Effects of exogenous melatonin and abscisic acid on physiological characteristics of grape seedlings under drought stress |
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| DOI：10.7606/j.issn.1000-7601.2020.03.14 |
| Key Words: exogenous melatonin exogenous ABA grape drought stress physiological characteristics |
| Author Name | Affiliation | | WANG Yunmei | College of Horticulture, Sichuan Agricultural University, Chengdu, Sichuan 611130, China | | XIA Hui | College of Horticulture, Sichuan Agricultural University, Chengdu, Sichuan 611130, China | | ZHOU Guihong | Science-Technology & Agriculture–Livestock Bureau of Wenchuan County, Aba Tibetan and Qiang Autonomous Prefecture, Sichuan 623000, China | | LIU Xinling | College of Horticulture, Sichuan Agricultural University, Chengdu, Sichuan 611130, China | | LIN Zhiyi | College of Horticulture, Sichuan Agricultural University, Chengdu, Sichuan 611130, China | | LIANG Dong | College of Horticulture, Sichuan Agricultural University, Chengdu, Sichuan 611130, China |
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| Abstract: |
| To investigate the combined effect of melatonin (MT) and abscisic acid (ABA) on plant response to drought stress, the potted seedling of ‘Shine-Muscat’ grape was used as material and the effects of MT and ABA on the physiological characteristics of the grape seedlings under drought stress were determined by the treatments of the root irrigation of MT solution (100 μmol·L-1), the leaf surface spray ABA solution (50 μmol·L-1), and their combination. The results indicated that MT treatment decreased the MDA, H2O2 content, and relative conductivity of grape leaves by 14.42%, 44.11%, and 21.26%, respectively, comparing with the drought control group (Dck). The content of relative water content of leaves increased by 1.12%. The activities of SOD and POD enzyme were improved by 14.00% and 3.01%, respectively. The MT treatment effectively mitigated the damage to the plant caused by drought stress. However, the MDA content and the relative conductivity of leaves in the treatment of 50 μmol·L-1 ABA were 9.43% and 17.25% higher than those in the drought control group, which indicated that the stress state of the plants was not alleviated under ABA treatment. In addition, the combination of MT and ABA had a similar effect to that of MT. The results suggested that MT can reduce the degree of membrane lipid peroxide and enhance the ability of antioxidant system, so as to alleviate the oxidative damage of grape under drought stress and improve the drought resistance. At the same time, MT alleviated the negative effects of ABA. |
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