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以中国水稻微核心种质为试验材料,在低氮水平下进行了水稻氮素利用率相关性状的鉴定评价,分析了产量和氮素利用率相关性状的相关关系。结果表明,秸秆含氮率和单株秸秆含氮量变幅分别为0.56%~1.85%和0.04~0.61 g,子粒含氮率和单株子粒含氮量变幅分别为1.28%~3.23%和0.02~1.04 g,植株含氮量变幅为0.10~1.30 g,氮素子粒产量利用率和氮素生物产量利用率变幅分别为3.85~57.52 g/g和17.56~104.02 g/g,氮素收获指数变幅为7.05%~88.58%,氮素利用率相关性状在品种间存在较大的差异。秸秆含氮率与含氮量、子粒含氮率与含氮量和植株含氮量在粳稻和籼稻亚种间没有显著差异;氮素生物产量利用率籼稻略大于粳稻,但差异不显著;氮素子粒产量利用率与氮素收获指数在粳稻和籼稻亚种间存在较明显的差异。氮素子粒产量利用率、氮素收获指数与结实率、单株子粒重和单株有效穗数均呈极显著正相关;认为在低氮水平下,结实率、单株子粒重和单株有效穗数可以作为耐低氮与氮高效水稻种质的筛选指标。
The microsatellite core collection of rice in China was used as experimental material to appraise the traits related to nitrogen use efficiency of rice at low nitrogen level. The correlation between yield and related traits of nitrogen use efficiency was analyzed. The results showed that the changes of nitrogen content of straw and nitrogen of single straw were 0.56% -1.85% and 0.04-0.61 g respectively, and the changes of nitrogen content and nitrogen content per plant were 1.28% -3.23% and 0.02 ~ 1.04 g, the variation range of nitrogen content of plants was 0.10-1.30 g, the yield of N use efficiency and N bioavailability were 3.85-57.52 g / g and 17.56-104.02 g / g, respectively, The amplitude ranged from 7.05% to 88.58%. There was a big difference in the correlation between nitrogen use efficiency among cultivars. There was no significant difference between the nitrogen and nitrogen contents, the nitrogen and nitrogen contents of the grains and the nitrogen contents of the plants. The nitrogen use efficiency of indica rice was slightly higher than that of japonica rice, but the difference was not significant. Nitrogen There was a significant difference between yield utilization of grain yield and nitrogen harvest index between japonica and indica rice subspecies. There was a significant positive correlation between yield of nitrogen utilization, nitrogen harvest index and seed setting rate, seed weight per plant and number of panicle per plant. It was considered that under the low nitrogen level, seed setting rate, grain weight per plant and plant effective Panicle number can be used as a screening index of rice germplasm which is resistant to low nitrogen and nitrogen.