采用溶液培养、石英砂培养和纸卷培养3种培养方法，在两个氮水平下研究不同基因型玉米的根系生长差异，比较不同培养方式对植株根系生长的影响。结果表明，不同的培养体系对植株生长性状影响较大，在相同的养分供应条件下，砂培的植株生物量、种子根长度、节根数、节根长度均显著超过纸培和水培。在实验期内(6叶期)，砂培条件下氮素供应显著影响种子根总长度；在水培条件下，氮素显著影响节根数量及长度。因此，分析文献中的根系数据时要考虑培养条件，同时要根据实验目标来确定培养条件。

In the present study, root traits of 7 genotypes were compared under paper roll, solution culture, and sand culture systems under two nitrogen levels, compared the difference in root traits of plants which are cultured in different systems. A huge difference in roots was observed under different culture systems. Under the same N nutrition condition, plants cultured in sand system had large biomass, more seminal and nodal roots, as well as longer seminal and nodal roots in comparison with other two methods. Significant difference in total seminal root length as affected by different N nutrition was only observed under sand system. Meanwhile, significant difference in nodal root number and total nodal root length as affected by N nutrition was only shown in solution culture system. It was suggested that care should be taken when analyzing root data resulted from different culture system. Also, different culture systems should be taken for different purposes in root study.

国家重点基础研究规划项目(2007CB109302)、公益性行业科研专项(200803030)