硅调控植物抗盐性机理的研究进展
首发时间:2015-10-30
摘要:土壤盐渍化是影响作物生长的主要非生物胁迫因子之一,严重影响作物的产量和品质。硅是地壳中第二大丰富的元素。虽然硅是否是植物生长的必需元素仍存在争议,但它对植物生长发育有益,并可提高植物的抗盐性。本文综述了硅提高植物抗盐性机理的研究进展,并对未来的研究方向提出了展望。硅对植物盐胁迫的缓解机制主要包括:促进根系水分吸收、维持营养吸收平衡、减少叶片水分散失、促进光合速率、改善抗氧化能力。在盐胁迫下,硅可调节植物的内源激素水平以适应胁迫,但硅是否参与信号通路尚不清楚、有待探索。
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Progress in research on mechanisms for silicon-mediated salt tolerance in plants
Abstract:Soil salinization is one of the main abiotic stress factors that influence crop growth, and it affects the crop yield and quality. Silicon is the second abundant element in the earth crust. Although whether silicon is an essential element for plants is still being debated, it is beneficial for plant growth and development and can enhance salt tolerance of plants. This review summarizes the recent research progress in the mechanisms for silicon-mediated salt tolerance in plants. The research perspectives are also suggested. The mechanisms for silicon-mediated alleviation of salt stress in plants include: increasing water uptake by roots, maintaining the balance of nutrient absorption, reducing the water loss from leaves, promoting photosynthetic rate,and improving the antioxidant defense.Under salt stress, silicon may regulate the levels of endogenous plant hormone to adapt to the stress. However, whether silicon is involved in signaling pathways is still unclear and remains to be explored.
Keywords: plant salt stress silicon salt tolerance
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