摘要
采用2个番茄品种(申粉918、沪樱932),以营养液设置相同氮浓度(3.0mmol/L,以N计)的NH4+-N、NO3--N、Gly-N三个处理,探讨无机氮(NH4+-N、NO3--N)和有机氮(Gly-N)对番茄幼苗生长、碳水化合物的积累及氮素吸收的影响.结果表明,在无机氮和有机氮存在的营养介质中,NH4+-N、Gly-N对番茄幼苗的生长有明显的抑制作用,对根系尤甚;与NO3--N处理相比,Gly-N、NH4+-N处理均显著提高了叶片可溶性糖、叶片和根系游离氨基酸含量以及各器官氮素含量,降低了叶片淀粉含量、各器官氮素积累量,而Gly-N处理的根系可溶性糖、淀粉含量升高;番茄幼苗基因型差异是否表现与氮素形态有关,以植株根系干重为指标的基因型差异在供应NO3--N时不表现;沪樱932的生长显著优于申粉918;不同品种对有机氮的吸收利用能力不同.
The effects of inorganic nitrogen （NH4^＋-N, NO3^--N） and organic nitrogen （Gly-N） on the growth, carbohydrate accumulation and nitrogen uptake of two genotype tomatoes （Shenfen 918 and Huying 932） under hydroponic cultivation were investigated. The results showed that the supply of NH4^＋-N and Gly-N significantly inhibited the growth of the tested tomato seedlings, and the growth of roots was more inhibited than that of shoots. The growth of Shenfen 918 in NH4^＋-N and Gly-N solution was more inhibited than that of Huying 932. Compared with NO3^--N treatment, soluble sugar content of leaf, and total free amino acid and N contents in roots and shoots were significantly increased with NH4^＋-N and Gly-N. However, leaf starch content and N concentration in different organs were decreased significantly, and root soluble sugar and starch content were enhanced under Gly-N treatment. The genotypical difference depended on N forms, and such difference could only be found under NH4^＋-N and Gly-N treatments. Our study indicated that tomato could use organic nitrogen （e.g. Gly-N） as a sole source of N, but this capacity was genotype-dependent.
出处
《应用与环境生物学报》
CAS
CSCD
北大核心
2008年第5期604-609,共6页
Chinese Journal of Applied and Environmental Biology
基金
国家"863"计划项目(No. 2006AA10Z221)
中国博士后基金(No. 2005038436)
上海市"蔬菜学"重点学科建设项目(No. B209)资助~~
关键词
番茄
无机氮
有机氮
碳水化合物
氮素吸收
tomato （Solanum lycopersicum）
inorganic nitrogen
organic nitrogen
carbohydrate
N uptake
