摘要
采用不同质量比的氮源、氮胁迫和不同钼质量浓度的营养液栽培方法,探讨其对蕹菜(IpomoeaaquaticaForsk)的生长和体内硝酸还原酶(NR)活性的影响,揭示蕹菜体内硝酸盐积累的规律。结果表明:以NO3-为单一氮源不仅会导致蕹菜NO3-严重积累,也会使产量偏低;而以NH4+为单一氮源,蕹菜则不能正常生长;蕹菜在收获前10 d停止供氮可以降低蔬菜中NO3-含量;随着钼质量浓度的增加硝酸还原酶活性呈上升趋势,但当钼质量浓度>0.378mgL时,硝酸还原酶活性则会降低,只有适当的钼浓度才可以降低蕹菜的NO3-含量。
In order to study the regularity of nitrate accumulation and the activity of nitrate reductase in swamp cabbage, hydroponics experiments were conducted with different ratios of NO3--N to NH4+-N and molybdenum levels respectively. The results showed that applying NO3- as the unique N source resulted in serious nitrate accumulation and lower crop yield. The nitrate content in swamp cabbage was decreased when N supply was stopped ten days before harvest. Supply of appropriate concentration of molybdenum could also decrease the nitrate content in the crop.
出处
《热带作物学报》
CSCD
2004年第1期68-72,共5页
Chinese Journal of Tropical Crops
基金
海南省自然科学基金资助项目(编号:30106)
中国农业科学院土壤肥料研究所农业部植物营养学重点开放实验室开放基金课题项目资助。
