| Alleviating effect of melatonin soaking on drought stress during soybean seed germination |
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| DOI：10.7606/j.issn.1000-7601.2020.02.27 |
| Key Words: soybean drought melatonin seed soaking germination root growth physiological mechanism |
| Author Name | Affiliation | | Qin Bin | College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China | | Zhang Mingcong | College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China | | He Songyu | College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China | | Zhang Chunyu | College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China | | Wang Mingyao | College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China | | Jin Xijun | College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China | | Wang Mengxue | College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China | | Zhang Yuxian | College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China | | Hu Guohua | College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China |
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| Abstract: |
| The drought\|sensitive soybean variety, Suinong 26, was used as the material to study the effects of different concentrations of melatonin (0, 100, 300, 500 μmol·L-1 and 800 μmol·L-1) soaking soybean seeds on the germination under simulated drought stress, 6% PEG-6000. The results showed that the germination of soybean seeds was inhibited through the drought stress treatment. Compared with the control, the germination energy, germination ratio, root volume, dry weight and fresh weight in the groups treated by D (6% PEG) significantly decreased by 38.14%, 23.72%, 21.4%, and 25.6%, respectively. The root conductivity, MDA and H2O2 content significantly increased by 51.18%, 83.33%, and 60.60%, respectively. Besides, the seed germination and the growth of roots under the drought stress were significantly promoted with the melatonin soaking treatment. The root diameter and dry weight significantly increased 16.38%, 29.73%, 34.97%, 31.72% and 10.70%, 14.28%, 10.70%, 25.00%, respectively. The activities of antioxidant enzymes (SOD, POD, CAT and APX) were further improved, among which they were increased most significantly with the treatment of M 500 + D (500 μmol·L-1 melatonin + 6% PEG) 37.61%, 40.10%, 12.96%, and 28.31%, respectively. It is preliminarily deduced that under 6% PEG-6000 simulated drought stress, the melatonin soaking with melatonin of 500 μmol·L-1 was the best treatment. |
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