氮素与植物镉胁迫响应的研究进展

Nitrogen and the Responses of Plants to Cadmium Stress

植物氮素营养与耐镉性关系受土壤类型、镉的浓度和植物种类等因素影响.氮素是植物所需大量营养元素之一.镉胁迫下,氮素养分管理影响镉离子的吸收、分配和脱毒,从而改善镉离子的毒害和植物营养的平衡.氮素形态尤其是无机氮源不仅会影响镉胁迫下氮代谢而且会影响其他营养物质代谢.文章综述了植物对氮代谢以及氮素对镉胁迫下植物生理生化的影响,以期通过合理的养分管理正确处理植物氮素和镉胁迫之间的关系,利用植物修复镉污染土壤.

The relations between nitrogen nutrients and cadmium(Cd)tolerance of plants depend on soil types,Cd concentration and plant species.Nitrogen is one of the most important nutrient elements required for plants.Under Cd stress,nitrogen nutrient management affects the absorption,distribution and detoxification of cadmium ions to improve the toxicity of Cd Ions and the balance of plant nutrition.The nitrogen forms,especially for inorganic nitrogen source,can not only affect the nitrogen metabolism under the stress but also affect the metabolism of other nutrients.The study reviews the effects of plant on nitrogen metabolism and nitrogen on the plant physiology and biochemistry under Cd stress,in order to treat the relationships between plant nitrogen and Cd stress correctly through reasonable nutrient management,and to use plants to remedy the Cd polluted soils.