中国生态农业学报2018，Vol.26Issue(3)：367-376,10.DOI:10.13930/j.cnki.cjea.170680
根际增氧对水稻根系形态和生理影响的研究进展
Research progresses in the effects of rhizosphere oxygen-increasing on rice root morphology and physiology
摘要
Abstract
Rhizosphere oxygen is an important environmental factor that influences paddy filed environment and physiological metabolism of rice root. Existing reviews about rhizosphere oxygen are usually from the perspectives of hypoxia or anoxia stress. In recent years, more and more researchers implemented active oxygen-increasing in rice cultivation and obtained a large number of results. Rhizosphere oxygen-increasing significantly affects the morphology and structure of hydroponic rice root, making rice roots slender and elongated. It may be due to the reduced demand for preventing the leakage of oxygen and invasion of reducing substances, which means there is no need to form a barrier against radial O2loss, so the thickness of outer layer cell wall of root is smaller than that under hypoxic or anoxic stress conditions. It's suggested that there is an internal consistency among the root morphology, structure and functional requirements of rice under aerobic condition. Rhizosphere oxygen-increasing significantly promotes root vigor with an increment from 10% to 150% and with great differences among varieties. From the aspects of root morphology, physiological activity and transformation of nitrogen form in root-zone, e.g., the increased fine root, the raised root vigor, the enhanced nitrification under aerobic treatment, rhizosphere oxygen-increasing is beneficial for rice roots to uptake nitrogen, however its effects on nitrogen accumulation in rice is complex and related with the method and degree of oxygen-increasing treatment. Excessive oxygen-increasing inhibits the use of nitrogen in rice plants, thus limiting the increase in biomass, which in turn inhibits the absorption and accumulation of nitrogen. Response of rice to oxygen-increasing is not a simple reverse of that to hypoxia or anoxia stress, the dramatic yield decrease of rice under oxy-gen-saturation treatment demonstrated the complexity of rice response to oxygen-enrichment environment. It's proposed that exploring the effects of rhizosphere oxygen-increasing on pre-third-leaf stage rice seedling and rice nitrogen metabolism, quantifying the demand for oxygen of field rice and seeking feasible oxygen-increasing measures in seedling stage was of great significance for further improving rice seedling raising technology and theory.关键词
水稻/根际增氧/根系形态/根系活力/氮代谢Key words
Rice/Rhizosphere oxygen-increasing/Root morphology/Root activity/Nitrogen metabolism分类
农业科技引用本文复制引用
周晚来,易永健,屠乃美,谭志坚,汪洪鹰,杨媛茹,王朝云,易镇邪..根际增氧对水稻根系形态和生理影响的研究进展[J].中国生态农业学报,2018,26(3):367-376,10.基金项目
中国农业科学院科技创新工程项目(ASTIP-IBFC07)、国家自然科学基金项目(31701372)、中国农业科学院基本科研业务费专项(Y2016CG14)和国家重点研发计划项目(2017YFD0301500)资助This study was supported by the Science and Technology Innovation Project of Chinese Academy of Agricultural Sciences(ASTIP-IBFC07),the National Natural Science Foundation of China(31701372),the Basal Research Fund of Chinese Academy of Agricultural Sciences(Y2016CG14)and the National Key Research and Development Project of China(2017YFD0301500). （ASTIP-IBFC07）
