关键词: 籼稻, 氮素利用效率, 根系, 氮, 一氧化氮

Abstract: To determine the mechanism of high nitrogen utilization efficiency of indica rice Yliangyou 886,the biomass, total nitrogen ( N) content, root development, nitric oxide(NO) levels of root and expression levels of N transport genes in root were analyzed in Nipponbare (japonica) and Y liangyou 886(indica) under two N concentrations(normal N concentration and low N concentration) by hydroponics and soil culture experiments.The results showed that the biomass,total N content and nitric oxide level of root were increased significantly in Yliangyou 886 compared with those in Nipponbare under the two N concentrations.However,the lateral root density of the two cultivars did not change significantly under two N concentrations. qRT-PCR results showed that the expression levels of several N transport genes in the roots were significantly up-regulated in Yliangyou 886 compared with Nipponbare under two N concentrations.To sum up,root of Yliangyou 886 has a strong ability to synthesize nitric oxide,thereby promoting the expression of several N transport genes and improving the N use efficiency.

Key words: Indica rice, Nitrogen use efficiency, Root, Nitrogen, Nitric oxide