【摘要】 通过淹水土培试验比较了常规籼稻(扬稻6号)和常规粳稻(农垦57)苗期生长和氮素吸收同化的差异。结果表明,籼稻在苗期鲜重和干重均显著高于粳稻,主要表现为根干重和鲜重的差异,而且籼稻根冠比显著大于粳稻的。2个品种水稻氮积累量均随生育期延长而增加,而氮素利用率随时间延长而下降。其中籼稻的氮积累量和氮利用率均显著高于粳稻的。籼稻和粳稻叶片谷氨酰胺合成酶活性(GSA)和硝酸还原酶活性(NRA)均显著高于根的GSA和NRA,籼稻叶片的GSA和NRA均显著高于粳稻的,而籼稻根的GSA和NRA与粳稻的无差异。更多还原

【Abstract】 Two rice cultivars indica(Yangdao 6)and japonica(Nongken 57)grown under waterlogged conditions were studied on the rice plant growth,nitrogen(N)accumulation,N use efficiency,glutamine synthetase activity(GSA)and NO3-reductase activity(NRA)at 44,51 and 58 days after sowing.The results obtained were listed as follows.The fresh and dry weights of indica were significantly higher than those of japonica at the whole incubation periods.The variation trends of the root/shoot ratio of dry weight were different between the two rice cultivars and the root/shoot ratio of indica,for instance,decreased with the development of the incubation time,while the reverse was true for the japonica.The root/shoot ratio of indica was significantly higher than japonica.N accumulations of the indica and japonica were significantly increased with the incubation time,while the N use efficiencies were significantly decreased with the time passed.The N accumulations and N use efficiencies of indica were significantly higher than those of japonica during the three sampling dates.GSA and NRA of leaves were always higher than those of roots for the two rice cultivars.The leaf GSA and NRA of indica were significantly higher than those of japonica,while there were no significant differences of the root GSA and NRA between indica and japonica.更多还原