中国水稻科学2017，Vol.31Issue(1)：72-80,9.DOI:10.16819/j.1001-7216.2017.6050
不同供氮模式对水稻根系形态及生理特征的影响
Effects of Different Nitrogen Supply Patterns on Root Morphological and Physiological Characteristics of Rice
摘要
Abstract
[Objective]The objectives were to study the effects of optimized N managements (OPTs,including HE and HYHE) on root growth, root morphological and physiological characteristics, and their relationships with N accumulation and yield formation.[Method]Hydroponic experiments using Zhendao 11 as material were conducted in a greenhouse with three N supply patterns:farmers′fertilizer practices (FFP,T1 ),nitrogen (N)application of high efficiency (HE,T2 ),and N application of high yield and high efficiency (HEHY,T3 ).[Result]Higher spikelet number per panicle,filled grain rate and1000-grain weight were achieved in HE and HYHE treatments compared to FFP,which led to grain yield increase of 5 .7% and 16.0% in HE and HEHY (OPTs),respectively.Rice roots in OPTs had higher root dry matter weight,total root surface area,root volume,and adventitious roots number per tiller and longer root length throughout the growth season.OPTs resulted in higher xylem flow sap rate,root N assimilation activity,and leaf photosynthesis speed anthesis stage and middle grain filling stage.The root dry matter weight, length,total surface area,volume,and adventitious roots number per tiller,xylem flow sap rate,and root N assimilation activity had significantly positive relationship with total N accumulation and grain yield.[Conclusion]OPTs could improve root growth,optimize root morphology,and maintain higher root physiological activities,thus achieving the improvement in N accumulation and grain yield.关键词
氮素优化管理/根系形态特征/木质部伤流液/氮素累积/产量Key words
optimized nitrogen managements/root morphological characteristics/root xylem sap/nitrogen accumulation/grain yield分类
农业科技引用本文复制引用
胡香玉,郭九信,田广丽,高丽敏,沈其荣,郭世伟..不同供氮模式对水稻根系形态及生理特征的影响[J].中国水稻科学,2017,31(1):72-80,9.基金项目
国家重点基础研究发展计划资助项目(2009CB118600). （2009CB118600）
