【摘要】 研究了引自中国南北廿个省、市的30个菠菜地方栽培种的No₃^-和No₂^-。其中属于无刺型和有刺型的各为15个。在田间试验条件下,新鲜菠菜的No₂^-一般均在1mg/kg以下,No₃^-均值含量无刺型1928mg/kg、有刺型1992mg/kg,统计检验无明显差异。但在各地栽培种种间,其No₃^-含量水平有明显差别。根处No₃^-的变异,经聚类分析处理,30个地方栽培种被划分为四大类群。No₃^-含量在2.0％（干重）以上的地方栽培种,共有22个,占总数73％,说明中国各地菠菜的卫生品质,大有改进的必要性。No₃^-含量在1％的第三群,其产量亦较高,似为最佳群。砂培等氮量试验证明了这些栽培种含No₃^-水平的高低,与各地栽培种具有的生理特性有关,为筛选低富集No₃^-品种提供了可能性。更多还原

【Abstract】 Nitrate and nitrite concentrations of thirty spinach cultivars(Spinacia oleracea Mill. .) were studied from twenty provinces of China. Among them, fifteen local cultivars are thorny type and the other fifteen arc non-thorny type. In the field experiment, nitrite content of spinach were usually less than 1 mg/kg. As for nitrate concentration of spinach plants, the average was 1992 mg/kg of their fresh weight for thorny type, and 1928 mg/kg for non-thorny type. Comparative studies indica-ted that there have no significent differences between these two types. But with great difference in nitrate accumulation occurred in local cul-tivars. They can be divided into four groups by Cluster Analysis based upon nitrate variation of these thirty spinach local cultivars. The NO3- contents of first and second groups including twenty two spinach local cultivars were more than 2 % ( d. w. ) . The N03~ contents of third group was lower than above mentioned two groups , being ] %(d. w.). On the other hand, the yield of third group was rather high. Fourth group possessed low yield. Therefore, the best one seems to be third group.The result of sand culture tests showed that local cultivars in diffe-rent N03- concentrations were characterized by their physiological basis. It provides a possibility for screening low NO3- accumulation of spinach local cultivars.更多还原