Key Laboratory of Sugarcane Biotechnology and Genetic Improvement (Guangxi), Ministry of Agriculture and Rural Affairs/ Guangxi Key Laboratory of Sugarcane Genetic Improvement/ Sugarcane Research Institute, Guangxi Academy of Agricultural Sciences/ Sugarcane Research Center, Chinese Academy of Agricultural Sciences, Nanning,, 530007, Guangxi, China.
Irrigation and Drainage Engineering, ICAR-Central Soil Salinity Research Institute, Regional Research Station, Lucknow, 226005, India.
Biol Res. 2021 May 1;54(1):15. doi: 10.1186/s40659-021-00338-2.
Water stress is one of the serious abiotic stresses that negatively influences the growth, development and production of sugarcane in arid and semi-arid regions. However, silicon (Si) has been applied as an alleviation strategy subjected to environmental stresses.
In this experiment, Si was applied as soil irrigation in sugarcane plants to understand the mitigation effect of Si against harmful impact of water stress on photosynthetic leaf gas exchange.
In the present study we primarily revealed the consequences of low soil moisture content, which affect overall plant performance of sugarcane significantly. Silicon application reduced the adverse effects of water stress by improving the net photosynthetic assimilation rate (A) 1.35-18.75%, stomatal conductance to water vapour (gs) 3.26-21.57% and rate of transpiration (E) 1.16-17.83%. The mathematical models developed from the proposed hypothesis explained the functional relationships between photosynthetic responses of Si application and water stress mitigation.
Silicon application showed high ameliorative effects on photosynthetic responses of sugarcane to water stress and could be used for mitigating environmental stresses in other crops, too, in future.
水分胁迫是一种严重的非生物胁迫，会对干旱和半干旱地区甘蔗的生长、发育和产量产生负面影响。然而，硅（Si）已被作为一种缓解策略应用于应对环境胁迫。
在本实验中，将硅作为土壤灌溉应用于甘蔗植株，以了解硅对水分胁迫对光合叶片气体交换的不利影响的缓解作用。
在本研究中，我们主要揭示了土壤水分含量降低对甘蔗整体生长性能的影响。硅的应用通过提高净光合同化率（A）1.35-18.75%、气孔导度对水蒸气（gs）3.26-21.57%和蒸腾速率（E）1.16-17.83%，减少了水分胁迫的不利影响。从提出的假设中得出的数学模型解释了硅应用对甘蔗光合响应的功能关系以及水分胁迫缓解的功能关系。
硅的应用对甘蔗对水分胁迫的光合响应表现出很高的改善作用，未来也可以用于缓解其他作物的环境胁迫。
