Chinese Journal OF Rice Science >
Effects of Different Nitrogen Supply Patterns on Root Morphological and Physiological Characteristics of Rice
Received date: 2016-03-25
Revised date: 2016-07-17
Online published: 2017-01-10
【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 and 1000-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.
Xiangyu HU, Jiuxin GUO, Guangli TIAN, Limin GAO, Qirong SHEN, Shiwei GUO . Effects of Different Nitrogen Supply Patterns on Root Morphological and Physiological Characteristics of Rice[J]. Chinese Journal OF Rice Science, 2017 , 31(1) : 72 -80 . DOI: 10.16819/j.1001-7216.2017.6050
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