中文摘要：

以8个不同基因型的小麦品种为材料,在4个不同供氮水平（0,0.05,0.1,2 mmol·L~（-1））下,研究了不同根系形态参数对氮素的响应情况。结果表明,根据不同品种的根系性状对低氮胁迫的响应情况,可以将8个供试小麦品种分为3类：第1类品种以辛石麦和跃进5号为代表,不同根系形态参数对低氮响应较好,但地上部生物量随氮素水平的降低而降低;第2类品种以西农979和陕优225为代表,根系形态参数对低氮响应较差,且地上部生物量随着氮素水平的降低而降低;第3类品种以孟县4号为代表,地上部生物量与根系形态参数均对低氮响应差。

英文摘要：

In this study,eight wheat cultivars with different genotypes were used to study the effects of the root morphological parameters on nitrogen under four different nitrogen supply levels （0,0.05,0.1,2 mmol·L~（-1））.The responses of different cultivars to different nitrogen levels were investigated according to root traits.The results show that the eight wheat cultivars can be classified into three categories： The first one,represented by Xinshimai and Yuejin 5,had a significant decrease in aboveground biomass with the decreasing of nitrogen level,but the root parameters had a good response to low nitrogen; The second one,represented by Xinong 979 and Shan you 225,had significant lower shoot biomass with the decrease of nitrogen level,but the root parameters had poor response to low nitrogen; The third one was represented by Mengxian 4,whose the shoot biomass and root parameters had poor response to low nitrogen.