草业学报Issue(6)：327-335,9.DOI:10.11686/cyxb20140639
氮高效利用基因型水稻干物质生产和氮素积累特性
Dry matter production and nitrogen accumulation of rice genotypes with different nitrogen use efficiencies
摘要
Abstract
Nitrogen plays an important role in promoting plant growth and development.The purpose of this study was to investigate the characteristics of dry matter production and nitrogen accumulation for rice geno-types with different nitrogen use efficiencies (NUE)and to analyse the relationship between grain yield and NUE.A soil culture pot experiment was carried out at Sichuan Agricultural University,Sichuan province,Chi-na in 2009.The grain yield of high NUE genotypes was 1.74-2.37 times higher than that of low NUE geno-types,while NUE of high NUE genotypes was 23.97%-70.55% higher than that of low NUE genotypes.Dry matter weight of high NUE genotypes was significantly higher than that of low NUE genotypes at all growth stages,which were 1.12,1.49 and 5.85 times higher than that of low NUE genotypes at tillering-to-jointing stage,jointing-to-heading stage and heading-to-maturity stages respectively.The peak dry matter weight of high NUE genotypes occurred at heading-to-maturity stage,while that of low NUE genotypes occurring at till-ering-to-jointing stage.Nitrogen accumulation rate of high NUE genotypes increased faster in the early stages, and achieved a maximum 30 -50 d after transplanting,then slowed down.Maximum nitrogen accumulation rates of Meigugu,IR31892-100-3-3-3 and IRIT216 were 11.32,12.36 and 15.83 mg/(d·plant),which were respectively 1.22,1.33 and 1.70 times higher than Jiazao 935;and,respectively,1.56,1.70 and 2.18 times higher than IR32429 with low NUE respectively.High NUE genotypes can maintain higher rates of nitrogen accumulation for longer,with an average duration of 49 d from tillering to heading stages.Low NUE genotypes had a development period 12 d shorter than that of high NUE genotypes.Dry matter weight and nitrogen accu-mulation at the heading-to-maturity stage were associated,respectively,with 62.65% and 47.42% differernce in rice yield,with 14.51% and 8.77% variation in nitrogen grain production efficiency,and 22.14% and 15.90% variation,respectively,in nitrogen harvest index.In summary,rice dry matter accumulation and ni-trogen accumulation were closely related to yield and NUE at the heading-to-maturity stage.Tillering-to-head-ing is a critical stage for rice nitrogen nutrition management.关键词
水稻/氮高效利用基因型/干物质量/氮素积累量/氮素利用效率Key words
rice/nitrogen efficiency genotype/dry matter weight/nitrogen accumulation/nitrogen utilization efficiency分类
农业科技引用本文复制引用
戢林,杨欢,李廷轩,张锡洲,余海英..氮高效利用基因型水稻干物质生产和氮素积累特性[J].草业学报,2014,(6):327-335,9.基金项目
国家自然科学基金（40901138），国家科技支撑计划子课题（2008BAD98B03）和四川省科技厅应用基础项目（2010JY0083）资助。 （）
