中文摘要：

为探究大豆不同品种间的亲缘关系对其生长和氮素吸收效率的影响,本研究选用“华夏3号（A）”、“桂早1号（B）”和“中黄24号（C）”3个亲缘关系不同的大豆（Glycine max）品种为实验材料,其中“华夏3号”为本研究的目标大豆品种,“桂早1号”为“华夏3号”的亲本之一,“中黄24号”与“华夏3号”无亲缘关系。设低氮（LN 0.6 mg·L-1）和高氮（HN 60 mg·L-1）2个氮素水平,以砂培盆栽方式培养。每盆种大豆4株,其中2株为华夏3号（A）,另外2株为华夏3号（A）或桂早1号（B）或中黄24号（C）,共有LN-AA、LNAB、LN-AC、HN-AA、HN-AB和HN-AC 6个处理,每个处理4个重复。结果表明：“华夏3号”与远亲缘大豆“中黄24”共同种植时其植株生物量、总根长、根体积比与近亲缘大豆“桂早1号”共存时显著增加,其中总根长、根体积在低氮处理下分别增加50%和57%,高氮处理下分别增加46%和50%;与远亲缘大豆共存时,“华夏3号”叶片硝酸还原酶活性显著增强,低氮和高氮处理分别增加56%和49%;盛花期大豆的茎叶全氮含量各处理间差异不显著,鼓粒期高氮处理下“华夏3号”与近亲缘大豆“桂早1号”共同种植的处理（HN-AB）的茎叶全氮含量显著高于与远亲缘（HN-AC）共同种植的处理,且低氮处理下也有相同趋势。研究结果表明,大豆可能具有亲缘识别的能力,且不同生育期存在差异。

英文摘要：

In order to investigate the effects of soybean varieties with different kin relationships on the growth and nitrogen utilization efficiency, three soybean （Glycine max ） varieties with dif- ferent kin relationships were selected for this intercropping experiment. Soybean variety Huaxia 3 （A） was the target variety which was intercropped separately with Huaxia 3 （A） , Guizao 1 （B） which was one parent variety of Huaxia 3, or Zhonghuang 24 （C） with no close phylogenetic re- lationship with Huaxia 3. The experiment was conducted under low nitrogen level （LN, 0.6 mg· L-1） and high nitrogen level （HN, 60 mg· L-1） by using sand culture method. There were 4 soybean plants in each pot with two plants of A and two plants of variety A, B, or C, forming treatments LN-AA, LN-AB, LN-AC, HN-AA, HN-AB, HN-AC with four replicates for each treatment. The result showed that the plant biomass, total root length, root volume of variety A intercropped with variety C were higher than with variety B. The total root length and root volume of A increased by 50% and 57% under LN-AC than under LN-AB, and by 46% and 50% under HN-AC than under HN-AB, respectively. The nitrate reduetase activity （NRA） of A was higher when intercropping with C than with B. NRA was 56% higher in LN-AC than in LN-AB and was 49% higher in HN-AC than in HN-AB. There were no significant differences among treatments intotal nitrogen content of leaf and stem （NCLS） at the full-bloom stage. However, NCLS of A va- riety in HN-AB was significantly higher than in HN-AC at the pod-filling stage. The same trend of kinship influence was observed under LN treatment at the pod-filling stage, In general, kin recog- nition exists in soybean and the recognition ability is affected by its growth stage.