| Cite this article: | 田德龙,侯晨丽,王平霞,等.分枝期水盐胁迫对紫花苜蓿生长及生理特征的影响[J].灌溉排水学报,2022,():-. |
| Tian Delong,Hou Chenli,Wang Pingxia,et al.分枝期水盐胁迫对紫花苜蓿生长及生理特征的影响[J].灌溉排水学报,2022,():-. |
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| Effects of water and salt stress on growth and physiological characteristics of Alfalfa at branching stage |
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Tian Delong1, Hou Chenli1, Wang Pingxia2, Ren Jie1, Li Zekun1
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1.Institute of Pastoral Water Conservancy,Ministry of Water Resources;2.Inner Mongolia Technical College of Mechanics and Electrics
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| Abstract: |
| 【Background】 Branching stage is one of the water-sensitive stages of alfalfa, and the response mechanism of alfalfa growth to water and salt stress in this stage is still unclear. Therefore, it is of great significance to explore the response mechanism of water consumption, biomass and biochemical reaction of alfalfa in branching stage to water and salt stress. 【Method】 A pot experiment was carried out in Shengmu High-tech Economic Park, Dengkou County, Inner Mongolia in 2018-2019, taking alfalfa as the research object. Three water treatments, W1, W2 and W3, were set for pot experiment. Salt was set at four levels, were 1, 1.5, 3.0, 4.5 g/kg, called S0-S3 treatment, respectively. Osmotic substances, antioxidant enzyme activities and aboveground and root biomass of alfalfa were measured at early flowering stage after water and salt treatment. Objective To investigate the effects of water and salt stress on soil water consumption, growth and physiological characteristics of alfalfa. 【Result】The plant height, root biomass, root shoot ratio and water consumption of alfalfa were increased when the salt content was less than 3 g kg-1, but the aboveground biomass of alfalfa was decreased to a small extent. Under mild water stress, adding salt increased the content of proline and Na+, SOD and POD activities, and alleviated the oxidative damage of alfalfa caused by drought. Compared with S0W1 treatment, drought + medium salt (S2W1) treatment increased the activities of proline and POD in stems and leaves, and decreased the content of Na+ in stems and leaves, resulting in water consumption and aboveground biomass increased by 11.93% and 17.51%, respectively. 【Conclusion】Under the combined stress of drought and salt, alfalfa showed a certain cross-adaptation phenomenon. 2-3 g kg-1 salt was suitable for alfalfa growth, and the optimal irrigation amount was 70%-85% of field water capacity. |
| Key words: Water salt stress; Alfalfa; Biomass; Osmotic regulating substance; Antioxidant enzyme activity |
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