摘要： 应用高效液相色谱仪分别于孕穗期、灌浆期和籽粒成熟期测定了田间生长玉米的第6，7，8和9层次生根中的16种主要游离氨基酸含量。结果表明：玉米同一品种不同层次的次生根中各氨基酸含量差异达极显著，不同品种相同层次的次生根中各氨基酸含量呈极显著正相关。在所测的不同类型根中游离氨基酸的总量在各层次生根中的顺序为：第9层次生根>第8层次生根>第6层次生根>第7层次生根。在所测根系的16种游离氨基酸中，谷氨酸(Glu)，脯氨酸(Pro)，丙氨酸(Ala)和天冬氨酸(Asp)含量高，占总量的50%以上；赖氨酸(Lys)和甲硫氨酸(Met)含量低。

关键词: 玉米, 生殖生长期, 根系, 游离氨基酸

Abstract: The contents of sixteen main free amino acids in root system of maize cv. Yedan 13 and cv. Danyu 13 were determined by High Performance Liquid Chromatography (HPLC) at booting stage, filling stage and kernel maturity stage. The results showed that the contents of free amino acids in different secondary roots were significant difference in the same variety, and there was a positive correlation among the contents of free amino acids in the same layer of different varieties. The sequence of total content of free amino acids in different secondary roots was ninth layer>eighth layer>sixth layer>seventh layer. The contents of glutamic acid (Glu), proline (Pro), alanine (Ala) and asparagic acid (Asp) in maize root system were higher than the others, and the contents of lysine (Lys) and methionine (Met) were the lowest.

Key words: Maize, Reproduction stage, Root system, Free amino acid

中图分类号: 

• S513.01