不同氮形态对两种基因型水稻根系形态及氮吸收效率的影响

为了探索不同铵硝配比对水稻根系形态和地上部N累积量的影响及其与根系吸N量的关系,以苗期N高效品种桂单4号和N低效品种南光为材料,设置1.0mmol/L NO3--N、0.5mmol/L NH4NO3、1.0mmol/L NH4 -N 3个N处理开展了研究.结果表明:含有NO3--N的处理总根长、总根数和总根表面积均明显高于NH4 -N的处理,且桂单4号和南光两种基因型水稻之间存在差异.两品种均在0.5 mmol/L NH4NO3处理中根系吸N量最高,其次是1.0 mmol/L NH4 -N处理,1.0 mmol/L NO3--N的处理根系吸N量最少.

Effect of Nitrogen form on Root Morphology and Nitrogen Absorption Efficiency of two Cultivars of Rice

In order to investigate effects of nitrogen form on root morphology, nitrogen accumulation in shoots of rice, and nitrogen absorption by roots, two rice cultivars, Guidan-4, high in nitrogen efficiency at the seedling stage, and Nanguang, low in nitrogen efficiency, were used in the experiment, which had three N treatments, 1.0 mmol/L NO3--N, 0.5 mmol/L NH4NO3, and 1.0 mmol/L NH4 -N. Results showed that Treatment NO3--N was obviously higher than Treatment NH4 -N in root tips, root surface area and root length though difference did exist between the two cultivars. Both of the two cultivars took up the highest amount of nitrogen in Treatment 0.5 mmol/L NH4NO3, and then in Treatment 1.0 mmol/L NH4 -N and Treatment 1.0 mmol/L NO3--N.